THE EFFECTS OF FORCED EXERCISE UPON THE AMOUNT AND INTENSITY OF SPONTANEOUS ACTIVITY OF YOUNG MALE ALI {NO RATS Thesis {or the Degree of DH. D. MICHIGAN STATE UNEVERSITY Dale L. Hanson 1962 This is to certify that the thesis entitled THE EFFECTS OF FORCED EXERCISE UPON THE AMOUNT AND INTENSITY OF SPONTANEOUS ACTIVITY OF YOUNG MALE ALBINO RATS presented by Dale L. Hanson has been accepted towards fulfillment of the requirements for AIL—degree in Physical Education / ,— , mew é}; / / Major professor Date March 30, 1962 0-169 LIBRARY Michigan State University ‘M‘ —y.r.m "1 E .-‘ K c ‘< ' ‘9; ,1 a. €A-£-,'m~‘-n ’ I “R“: ‘— THE EFFECTS OF FORCED EXERCISE UPON THE AMOUNT AND INTENSITY OF SPONTANEOUS ACTIVITY OF YOUNG MALE ALBINO RATS By A O. ,. Dale L? Hanson AN ABSTRACT Submitted to Michigan State University in partial fulfillment for the requirements for the degree of DOCTOR OF PHILOSOPHY Department of Health, Physical Education and Recreation 1962 ABSTRACT THE EFFECTS OF FORCED EXERCISE UPON THE AMOUNT AND INTENSITY OF SPONTANEOUS ACTIVITY OF YOUNG MALE ALBINO RATS by Dale L. Hanson The purpose of this experiment was to determine the effects of forced exercise upon the amount and intensity of the spontaneous activity of ten young male albino rats and to compare their spontaneous activity with the spontane- ous activity of ten young male albino rats which were seden- tary for a selected period of time. The rats in the seden~ tary group were allowed but sedentary activity for the first half of the experiment and were allowed spontaneous activity for the final half. The rats in the forced exercise group were forced to exercise by swimming with the overload method for thirty minutes each day for the first half of the experiment and during the final half were allowed spon- taneous activity with no forced exercise. Ten rats were assigned to the control group which were allowed spontaneous activity during the entire experiment. The experiment ran for seventy consecutive days. All rats were of the Sprague- Dawley strain. Spontaneous activity was measured daily for each individual rat by mechanical revolution counters that were attached to their cages. These data were recorded daily. DALE L. HANSON The intensity of spontaneous activity was measured by six spontaneous activity cages equipped with microswitches. The microswitches were wired through a relay box to signal magnets which recorded an ink mark for each Wheel revolution on a continuously moving monodrum. The individual rats from the various groups were placed on a rotation schedule so that each rat was in a microswitch-equipped cage once for a 24-hour period every five days. Spontaneous activity inten- sity data were recorded upon analysis of the monodrum papers. Intensity data included the average speed in feet per minute that the spontaneous activity wheel turned and the average number of wheel revolutions per exercise bout. The results indicated that young male post-forced exercise rats ran, spontaneously, a significantly greater number of total revolutions, ran these revolutions at a signi- ficantly faster rate per revolution, and had significantly greater numbers of revolutions per exercise bout than either the post-sedentary or control group rats. There was no signi- ficant difference between control rats and post-sedentary rats in the amount and intensity of spontaneous activity. A rela- tively high coefficient of linear correlation, .736, was found between total spontaneous activity revolutions in exercise bouts and the average number of spontaneous activity revolu- tions per exercise bout. A relatively high coefficient of linear correlation, .703, was also found between the average number of spontaneous activity revolutions per exercise bout and the average rate of spontaneous activity. THE EFFECTS OF FORCED EXERCISE UPON THE AMOUNT AND INTENSITY OF SPONTANEOUS ACTIVITY OF YOUNG MALE ALBINO RATS By ‘L 1‘. Dale Lt Hanson A THESIS Submitted to Michigan State University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Department of Health, Physical Education, and Recreation 1962 Dedication is made to my wife, Dorothy, whose love has given me added purpose and an en- couragement to achieve. ACKNOWLEDGMENTS The author wishes to acknowledge Wayne Van Huss whose personal and professional friend- ship has encouraged me to undertake this task and whose patient understanding and assistance has enabled me to complete same. Acknowledgment is also made to Henry Montoye for his interest in me and my research. D.L.H. TABLE OF CONTENTS CHAPTER PAGE I. TI-IE PROBLEM O O O O O O O O O O 0 O O O O O O 1 IntrOductj-On C C O O O O O O O C O O O O O 1 Statement of the Problem . . . . . . . . . 1 Importance of the Problem . . . . . . . . . 1 The Limitations of the Study . . . . . . . Definition of Terms . . . . . . . . . . . . WW“) II. REVIEW OF THE LITERATURE . . . . . . . . . . Apparatus Used for Measurement of Spontaneous Activity . . . . . . . . . . 5 Forced Exercise and Spontaneous Activity . 6 Age and Spontaneous Activity . . . . . . . 10 Sex and Spontaneous Activity . . . . . . . 12 Spontaneous Activity Patterns . . . . . . . 13 Environmental Factors and Spontaneous Activity . . . . . . . . . . . . . . . . 15 Adjustment to Spontaneous Activity Wheels . 16 Food Intake and Spontaneous Activity . . . 16 Body Weight and Spontaneous Activity . . . 17 Handling of Rats and Body Weight . . . . . 18 Rest and Spontaneous Activity . . . . . . . 18 Testis Hormone and Spontaneous Activity . . 19 General Application . . . . . . . . . . . . 19 III. EXPERIMENTAL METHOD . . . . . . . . . . . . . 20 CHAPTER IV. V. BIBLIOGRAPHY . APPENDIX . Subjects and Equipment Test Periods Total Activity Activity Intensity Discussion RESULTS Summary . Conclusions Recommendations . SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS 111 PAGE 20 28 31 34 45 4s 48 5o 50 52 57 TABLE I. II. III. IV. VI. VII. VIII. IX. LIST OF TABLES Analysis of Variance of Data for Total Revolutions of Spontaneous Activity During Treatment Phase . . . . . . . . . . . . . Analysis of Variance for Total Revolutions of Spontaneous Activity During Post- Treatment Phase . . . . . . . . . . . . . Analysis of Variance of Data for Rate of Spontaneous Activiy During Treatment Phase Analysis of Variance of Data for Rate of Spontaneous Activity During Post-Treatment Phase . . . . . . . . . . . . . . . . . . Analysis of Variance of Data for Spontaneous Activity Revolutions Per Exercise Bout During Treatment Phase . . . . . . . . . . Analysis of Variance of the Data for Spontaneous Activity Revolutions Per Exercise Bout During Post-Treatment Phase Spontaneous Activity Patterns - Per Cent of Total Revolutions Per Hourly Period . . Analysis of Variance of Data for Adrenals/ Body Weight . . . . . . . . . . . . . . . Analysis of Variance of Data for Heart/Body weight 0 O O O O O O O O O O O O O O O O 0 PAGE 32 37 38 40 41 43 59 63 64 TABLE XI. XII. XIII. Analysis of Variance Body Weight . . . Analysis of Variance Body Weight . . . Analysis of Variance Body Weight . . Analysis of Variance Body Weight . . . of Data for of Data for Testes/ Liver/ PAGE 65 66 LIST OF FIGURES FIGURE PAGE 1. Spontaneous Activity Intensity Measure- ment Equipment . . . . . . . . . . . . . . . 26 2. Average Revolutions Per Group During the Treatment Phase . . . . . . . . . . . . . . 33 3. Average Revolutions Per Group During the Post-Treatment Phase . . . . . . . . . . . . 35 4. Average Rates of Spontaneous Activity Per Group During the Treatment Phase . . . . . . 36 5. Average Rates of Spontaneous Activity Per Group During the Post-Treatment Phase . . . 39 6. Average Revolutions Per Spontaneous Exercise Bout Per Group During the Treatment Phase . . . . . . . . . . . . . . 42 7. Average Revolutions Per Spontaneous‘ Exercise Bout Per Group During the Post- Treatment Phase . . . . . . . . . . . . . . 44 8. Spontaneous Activity Patterns - Per Cent of Total Revolutions Per Hourly Period for Treatment Phase . . . . . . . . . . . . 6O 9. Spontaneous Activity Patterns - Per Cent of Total Revolutions Per Hourly Period for Post-Treatment Phase . . . . . . . . . . 61 10. Organ Weights Per Body Weight Per Group at Termination of Treatment Phase ... ..... ... 67 FIGURE 11. 12. 13. 14. 15. 16. 170 Rat Body Weight Per Test Period Per Group Room Temperature for Entire Experiment . Ear Markings for Identification of Individual Rats for the First Half of the Experiment . . . . . . . . . . . . Ear Marking for Individual Rat Identifi- cation for the Second Half of the Experiment . . . . . . . . . . . . . . Rotation Order for the First Half of the Experiment . . . . . . . . . . . . . . Rotation Order for the Final Half of the Experiment . . . . . . . . . . . . . . Forced Exercise Group's Daily Overload Weights (Grams) . . . . . . . . . . . Data Sheets 0 O O O O O O O O O I O O O O O O O 0 vii PAGE 68 69 71 72 73 74 75 76 CHAPTER I THE PROBLEM Introduction Physical educators are generally agreed that regular exercise is beneficial to health. They are not agreed, how- ever, as to the reasons why some persons engage in exercise regularly throughout their lives while others remain seden- tary. Actually an understanding of the basic reasons for such great differences in spontaneous activity is lacking. There has been much speculation as to the factors responsible for the development of various levels of spontaneous activity but unfortunately these ideas have not been tested by even a reasonable amount of research. Statement o;_the Problgm The purpose of this study was to determine the ef- fects of mild pre-puberty forced exercise upon the amount and intensity of the spontaneous activity of young male albino rats. Importance_gfpthe Problgg There is much scientific evidence to support the statement that exercise, taken regularly, can be beneficial to the deveIOpment and maintenance of positive health. Realizing this, physical educators must concern themselves with an understanding of the factors that contribute greatly 2 to desirable levels of regular spontaneous activity. This could well be the most important goal of physical education, to develop in all students a desirable level of regular spontaneous activity that would persist throughout their lives. This is an especially difficult task when there is a definite lack of data relating to the alteration of spon- taneous activity patterns and even less data is available relating to a measurement of the intensity of spontaneous activity. It would be extremely difficult to study spontaneous activity in humans because of the numerous variables that could not be controlled. Rather than start at this level, it seemed desirable to study the spontaneous activity of animals where the variables could be greatly reduced. Therefore, the findings can be applied in a more general- ized way than the findings of human studies where they will be specific to the individual and his environment. Also, it is possible to sacrifice animals when desired in order to study any organ changes that might have occurred. The subjects,in most previous animal studies dealing with spontaneous activity, have been mature. It seemed deem sirable to study animals that were young and had not already gone through the growth and deveIOpment phase of life. It was hoped that this study would provide insights that would serve useful in future studies of spontaneous activity. The Limitations of the Study The present study was conducted using young male albino rats. Many peOple feel that the findings from animal studies, no matter how significant, cannot be made applicable to humans. The number of animals used in this experiment was limited to the available spontaneous activity cages. The number of animals which received a more thorough measurement of their spontaneous activity per day was limited by the device set up to measure same. This study was concerned mainly with the effects of forced exercise upon spontaneous activity. The findings were analyzed on the basis of the spontaneous activity of the animals studied. Definition of Terms Spontaneous activity. Spontaneous activity is used to denote the animal's walking and running movements in a wheel that proceeded from a native internal impulse without external force. Forced exercise. Forced exercise is used to denote the treatment given those subjects which were placed in water and were thereby forced to swim to avoid drowning. Sedentary. Sedentary is used to denote the treatment given those subjects which were housed in small cages,there- by greatly limiting their physical activity. Control group. Control group is used to denote those subjects which did not receive planned treatment, but 4 were allowed spontaneous activity throughout the experiment so as to serve as a basis for comparison. Experimental groups. Experimental groups is used to denote those subjects which received planned treatment for the purpose of demonstrating the effects of this treatment upon spontaneous activity. Exercise pggg. Exercise bout is defined as two or more marked revolutions on the monodrum paper with no space of one centimeter or more between two or more marked revo- lutions. CHAPTER II REVIEW OF THE LITERATURE It must be stated initially that there is a definite lack of literature directly concerned with the effects of forced exercise upon the spontaneous activity of young male albino rats. No previous studies were found that were con- cerned with a measurement of the intensity of the spontane- ous activity of rats° With this in mind, consideration is given to collateral experiments dealing with the spontaneous activity of albino rats. The strain of rat is indicated when possible. Apparatus Used for Measurement of Sppntaneous Activity Apparatus used for the measurement of spontaneous activity are generally constructed along similar designs. These consist of a freely moving exercise wheel connected to a partition wall with a small rectangular cage on the Opposite side. Differences are noted in the diameter of the exercise wheels, but generally Richter and Wang's (23) design is used which measures 13 inches in diameter with a 6~inch width. When the diameter of the exercise wheel varies from this model, it is difficult to compare total activity (27, 31). Shirley (27) reports that data taken from the revolving drum method were proved to be reliable and highly consistent. 6 The question could be asked whether the moving drum records all of the activity of an animal. Slonaker (32) re~ ports that observations of the white rat prove that most of its activity is manifested in running, practically all of which is recorded. Slonaker (32) describes a method of measuring activity per hourly period using a modified alarm clock, writing pens, and a moving kymograph. Richter (20% in early attempts to measure spontaneous activity,used a 10~inch high by 14-inch long cage that was supported on a rubber membrane lying over a large tambour. A central lever, connected to the tambour, recorded on smoked paper of a kymograph. Forced Exercise and Spontaneous Activigy Thomas and Miller (39) investigated the influence of forced exercise of varying severity on food intake, body weight, and spontaneous activity of albino rats of the Sprague-Dawley strain. A treadmill was used for the forced exercise and those animals which refused to run on the tread- mill were placed in the control group. Their results indi- cate that food intake of forced exercise rate fell below that of the control group on exercise days up to an exercise level of approximately one mile per day and thereafter ex- ceeded control rats even on exercise days, but the difference was not significant. The adaptation to exercise achieved was diminished during a subsequent resting period of five and one~half weeks as judged by weight loss and exhaustion in response to an exercise of one-half the intensity that had been reached by the end of the forced exercise phase. They found that spontaneous activity was greatly depressed in the forced exercise rats on exercise days and to a lesser but not significant degree also on resting days. Following the termination of the forced exercise, food intake and the rate of weight gain were significantly elevated for a very considerable period of time along with a persistent de- pression of spontaneous activity and that all three factors approached control levels coincident with the restoration of body weight deficit incurred during the forced exercise. Thomas and Miller (39) feel that the decreased spon- taneous activity associated with forced exercise is of obvious benefit in conserving total energy expenditure. It is possible that body weight deficit is an important deter- minant of spontaneous activity. It cannot be the only factor as is suggested by the return of spontaneous activity to nearly normal levels on resting days, despite the presence of a cumulative weight deficit. Thomas and Miller (39) also state that the forced exercise probably induced a stress. Selye (26) defines stress as the state manifested by a specific syndrome which consists of all the non-specifically induced changes within a biologic system. Stress causes certain changes in the structure and chemical composition of the body which can be accurately appraised. The totality of these changes is called the "General Adaptation Syndrome." The stressor in this case would be excessive muscular exercise. The initial response to the stressor is called "alarm reaction" and consists of shock and countershock phases. In the acute phase of alarm reaction, general resistance to the particular stressor falls way below normal. This results in adrenal stimulation, shrinkage of lymphatic organs, gastrointestinal ulcers, loss of body weight, and alterations in chemical compositions of the body. As the adaptation is acquired, the capacity to resist rises considerably above normal and this phase is called the "stage of resistance" whereby the internal responses stimu- late tissue defense. In the third phase, "stage of ex» haustion," resistance drops below normal again. Only the most severe stress leads eventually to the stage of exhaustion and death. Resistance and adaptation depend upon a proper balance of these three factors. i Levels of Normal / “x 7 Resistance —‘~ ~ / A.R. S.R. ' S.E. GENERAL ADAPTATION SYNDROME Richter and Uhlenhuth (22) found that castration of domesticated male rats was followed by a sharp decrease in activity, but this was not true with wild rat castration as this failed to produce a sharp drop in activity. A gona- dectomy had little effect on the small adrenals of the do~ mesticated males, but followed a marked increase in the weight of the already large adrenals of wild males. In 9 explanation, they report that steroids from the adrenals as from the gonads may contribute to the production of spontane- ous running activity. The wild rat’s adrenals would be ex~ pected to contribute higher amounts of steroids since they are larger and by various tests show greater secretory acti- vity than those of domesticated rats. The fact that gona- dectomy has so little effect on the running activity would indicate that in this strain most of the steroids that pro- duce running activity come from this gland. The domesticated rat's small adrenals show much less secretory activity and so would be expected to contribute less to the production of spontaneous running activity. The fact that gonadectomy has such a profound effect on spontaneous activity of domesti- cated rate would tend to indicate that in this strain activity depends largely on the steroids from the gonads. The differ- ences of effects of gonadectomy in the two strains suggested that the running activity of wild rats is maintained largely by adrenal secretions; whereas, the activity of domesticated rats is maintained largely by gonadal secretions. Forced exercise is a stress which causes the adrenals to enlarge. This should have an effect of increasing the amount of spontaneous activity. Price - Jones (19) found that forced exercise, conm sisting of steady running in a rotating wheel about five hours daily, is shown to diminish or retard normal increase in both weight and skeletal deveIOpment in white rats as compared with resting controls from the same litters. 1O Wever (41) reports that when albino rats are swum in low water temperatures (10-200 C.), the rats want to escape from the tank faster. With high water temperatures (£15O C.), the rats become confused and disorganized. The recommended temperature approximates the rat's body temperature (370 C.). Griffiths (9) reports that vibressaeless wild rats that are forced to swim, succumbed in a short time as to make plaus- ible the hypothesis that death was the result of emotional factors. Age and spontaneous Activity Studies involving total spontaneous activity of rats must consider the age of the rats in order to make valid comparisons. Slonaker (31) reports that rats at different ages show marked differences in activity. The age of greatest activity is between 87 to 120 days and the very young and old rats are relatively inactive. In each animal he noted an increase in activity throughout two months of continuous observation. Slonaker (33) later reported that in compar» ing records of activity of young rats, the periods of activity and rest are of short duration and have no definite arrangew ment so far as time of the day is concerned. As rats grow older the activity becomes greater with the greatest activity in the seventh to the twelfth month of life which is about one~third of the natural life span of a rat. He found cyclic variations of the order of two to six months 11 in the activity of male rats. Richter (20) studied individual rats which were 30, 100, 210, 250, 450, and 600 days of age at entry into the wheel cage and plotted curves showing continuously increas~ ing activity for each animal throughout a thirty-day period of observation. Extrapolating, he writes that activity is low at 25 days of age, increasing to a maximum at 125 days of age, and then decreases slowly until at 600 days of age, it is roughly equal to the original level. Richter (21) also found that the activity of 52~day old animals increased up to approximately 100 days of age, then decreased until the initial level was attained at 150 days of age. Activity of a 145-day old rat increased gradually throughout 50 days of observation. He concluded that there are cyclic vari- ations of the order of 12 to 30 days in the activity of some individual male rats. Shirley (28) found that activity increases up to 210 days of age and then decreases. Jones et al. (13) report that age differences among animals are associated with differences in volitional activity levels. They conclude that at any given time, the younger the initial age of the group, the greater is the activity. In general, the younger the initial age of the group, the longer is the time re- quired to reach a maximum level. The age of greatest activity is approximately the time of puberty, 50 to 70 days of age in the male rat of the SpragueeDawley strain. 12 Individual record examination does not reveal a tendency to- ward long-term cyclic variation. When environmental condi~ tions, such as temperature, light, and sound, are controlled, volutional activity of the normal male rat is the function of age and of the animal's experience in the wheel. For animals of equal experience, activity varies inversely with age although not in a linear manner. Browman (3) reports that rats have a peak of volu~ tional muscular activity during the first nine months of life at approximately 2% to 3% months of age after which there is a gradual decline of activity. Browman later re— ports (6) that a gradual increase in spontaneous activity is noted as the rats grow older, reaching a peak at about three months of age. Montoye et al. (16) report a decrease in spontaneous activity with increasing age in mature rats of the Sprague-Dawley strain with greatest activity at 26 weeks of age, decreasing until 29 weeks of age at which time activity leveled off until a continual decrease was noted from 34 weeks of age until the termination of the experiment at 38 weeks of age. Sex and Spontaneous Activity Wang (42) reports that adult female rats show regular cycle changes in daily amounts of activity, usually four days in length, but males do not show such rhythmic fluctu— ations. Slonaker (36) reports that daily fluctuations in average daily activity are common to both sexes. A greater tendency toward synchronous fluctuations existed in the males than in the females. These fluctuations in activity appear to he of normal occurrence and must be considered in experiments dealing with activity. Hitchcock (11) found average activity of the males to be about 56 per cent of that of the females. The differ- ence is presumably related to an increase in activity ac- companying oestrus cycle. Browman (3) also reports that males are not as active as female rats. Richter (22) states that males do not show four to fiveeday cycles of activity as females and are less active then females. Males’daily activity showed relatively small fluctuations as compared with the females. Spontaneous Activity Patterns Richter (20) found that rats are alternately active and inactive and the regularity of the recurrence of the periods is quite striking. Young rats have a rate that is rapid and average 15 hours of activity for the 24~hour period, while the old rats are active for about 10 hours out of the 24. The length of activity periods also shows some variation with age as they are longer in the younger rats and progressively shorter in the older ones. Oppenheimer (17) mentions that the rat is naturally a rather sedentary creature, but if given Opportunity, it will increase its spontaneous activity until it is running four to five miles per day. Richter (22) and Thomas and 14 Miller (39) report the same. Rundquist (24) feels that activity is largely inherent and that it is partially dominant to inactivity. Slonaker (33) found no regularity in the distribution of the activity and periods of rest at 32 days of age and no apparent tendency to be more active at one time in the 24-hour period than at another. At six months of age, there is a great bulk of activity occurring during the evening and early nighttime, he reports. Slonaker found that female rats performed almost all of their activity during the night and so he draws the following conclusions: (1) the albino rat is nocturnal, usually running very little during the daytime; and (2) the main part of the activity occurs between the hours of 8:00 P.M. and 10:00 A.M. with the maximum hourly activity occurring between 12 midnight and 4:00 A.M. Slonaker (34) later recorded activity every hour over a period of eight days and six hours and found that activity occurred at night beginning at about 8:00 P.M. and ending at 10:00 A.M. with a maximum between 12 midnight and 2:00 A.M. Hunt (12) also states that the rat does most of its running during the night hours. Thomas and Miller (39) found that rats run two to three minutes at a time and always stop before exhaustion. Hunt (12) reports that rats run in five-minute periods dur- ing the day. 15 Environmental Factors and Spontaneous Activity Slonaker (35) reports that activity fluctuations were due to normal changes in rats and hot due to humidity, temperature, or barometric pressure. Browman (5, 6) found that the normal nocturnal spontaneous activity rhythm and oestrous cycle of the albino rat is dependent upon the con~ comitant daily variation of both light and temperature. Richter (20) reports that temperature changes modi- fied spontaneous activity chiefly affecting the period of maximum activity. Rats reached a period of maximum activity in low temperatures of 10 to 150 C. while higher temperatures of 29 to 300 C. delayed the onset of the period of activity. Browman (3) also found peaks of activity with the daily cool period when light is kept constant, but daily temperatures varied. Shirley (28) reports that gradual temperature changes have a negligible effect on activity and Rundquist (24) and Browman (3) both agree. Richter (20) reports that the rat is more active in the dark than in the light periods and is, therefore, nocturnal in its spontaneous activity. Hunt (12), Slonaker (33, 34), and Browman (6) agree. Browman (2) reports that daily activity rhythms of rats exposed to continuous light is a periodic fluctuation between nocturnal and diurnal activity. A reversal of day—night light conditions causes a corresponding reversal of daily activity rhythms. Browman (3) feels that rats with normal vision are more influenced in spontaneous activity by light changes than temperature. Browman (4) reports that normal rats in continuous light have relatively frequent shifts and reversals in their daily spontaneous activity rhythms. Normal rats in an artificial 16-hour day established and maintained a 16uhour day-night Spontaneous activity rhythm. Browman (2) found that animals in adjacent cages spa parently exert no influence upon each other's activity I‘ll: y thin S 0 Adjuctgent‘thSpontaneous Activigimflhgglg Slonaker (35) found that it took one week for young animals to adjust to the spontaneous activity cages. Rund- quist (24) found that animals need a few days to adjust to the wheels; six days in his experiment. Gaetan and Bees (7) found it took young albino rats four days of running to ad- just to the wheels. Eood_lntake and Spontaneous Activity Richter (20) reports that the spontaneous activity of the rat is very intimately related to the food habits of the animal. His experiments show that the rat is naturally inactive for a time after eating and that it does not become active again of its own accord for several hours after eat- ing. Maximal spontaneous activity is reached when the whole stomach becomes involved in hunger contractions. With the cessation of the stomach contractions, the animal becomes inactive. Gross bodily activity increases progressively as 1/ the activity of the stomach increases. Shirley (23) also found that under conditions of constant food and lighting, the daily activity cycle of the rat is @31Y0h&510 With the greatest activity prior to feeding. Ste reports that $0 per cent of the entire day's work is done one hour before feed- 1 '11:; . Smith and Conger (37) found that as much as 56 per cent of the calorific value of food may come from fat and Spontaneous activity will be maintained at a normal level. Seventy-two per cent of fat calories depresses activity a little and 50 per cent animal protein induces a marked in~ crease in activity. Lee and Van Buskirk (14) report that evidence is en— tirely against any idea that the amount of spontaneous activity manifested by an animal is dependent upon the basal metabolic level. Eggxuflggghtqand Spontaneous Activity Slonaker (34) reports that sedentary rats surpassed the Spontaneous activity rats in weight and that exercised rats reach a maximum weight at an older age than sedentary rats. He later reported no correlation between activity peaks and weight or food consumption (35). Brobeck (1) found a negative correlation between weight change and activity of female rats (SpraguewDawley strain) when food intake and environmental temperature were constant. Mont- oye et al. (16) found that when rats are allowed to exercise 18 spontaneously only after they have matured, the exercise will show little effect on body and organ weights. Handling of Rats and Body Weight Weininger (40) found that gentled albino rats (Wistar strain) gained more weight on a free-feeding diet than non- gentled or group living animals. McClelland (15) found that those rats (Wistar strain) which were stroked for a period of time each day gained significantly more weight than non- stroked rats. Gertz (8) reports that rats (Wistar strain) handled at various ages and later tested for emotionality failed to show significant differences as adults. It was concluded that there is no evidence for a "critical age" at which handling is effective in terms of later behavior. Rest andfgpontaneous Activity Shirley (28) found that the cumulative effect of rest is to impair activity. Siegel (29) found that a 24~hour period of physical restraint was followed by a slight in- crease in activity as compared to zero hours confinement. Six and twelve-hour confinement intervals were followed by significant decrement in gross bodily activity. Siegel (30) later reports that when a 6-hour period of confinement oc- curred during the period from late morning to early evening, subsequent activity showed a 26 per cent decrease under the activity of a control period. When confinement period was introduced in early to late morning, no difference in activity was observed relative to the control. Tespls Hormone and Spontaneous Activity Richter and Uhlenhuth (22) found that gonadectomy caused a short drOp in spontaneous activity in domesticated rats, but did not cause a significant change in wild rats. Heller (10) reports that the spontaneous activity of the rat is by no means proportionate to the testis hormone secretion. Stone and Barker (38) found no reliable evidence that there is a true relationship between spontaneous activity and the best estimates of sexual aggressiveness. General Application Slonaker (34) states that spontaneous activity study of the rat is of general application to man because both man and the rat are omnivorous. This is not to say that the findings from rat experiments can be directly applied to man, but that they should offer insight to man's spontaneous activity. CHAPTER III EXPERIMENTAL METHOD The purpose of this experiment was to determine the amount and intensity of spontaneous activity of young male rats during and after a period of forced exercise and to compare their spontaneous activity to the spontaneous activity of young male albino rats which had been sedentary for a se- lected period of time. The rats assigned to the sedentary group were allowed only sedentary activity for the first half of the experiment and were allowed spontaneous activity the second half. Those which were assigned to the control group were allowed spontaneous activity during the entire experiment. Those which were assigned to the forced exercise group were allowed spontaneous activity and, in addition, were forced to exercise by swimming daily for 30 minutes with the overload method for the first half of the experi- ment and then for the second half were allowed spontaneous activity with no forced exercise. The sedentary and forced exercise groups were called the Experimental Groups. C“altjects and Equipment C The animals used in this expvPiment were 45 V0”n5 male albino rats of the Spraguc-Dawley strain. These animals W9T9 29 days old when they were received in the laboratory, 33 days old at the start of the experiment, 59 (.— days old at the termination of the first half, and 103 days old at the termination of the experiment. hese rats war? born on the same day, but were not litteruuaf C. All rats were fed Wayne Lab Blox for Rate, manufactired ry Allie? Mills of Chicago, and were allowed to consume all the feed they desired. Records were kept on all ford runsum d for each rat as part of another study that was being run can" currently. Special care was taken to insure th at at no tip was an animal without food since previous research has 141‘ cated that rats will in m (I _J m In I 3 1 2 3 4 5 e 7 TEST PERIODS AVERAGE PET’OLUTIOTTS PER GROUP DURING THE TEATE—‘IEI‘IT PHASE 34 difference between the control group mean and the sedentary group mean. The mean values for test periods eight through fourteen are graphed on Figure 3. Activity Intensity The rate of spontaneous activity was determined by the average rate of feet per minute that the spontaneous activity wheel turned during spontaneous exercise bouts. Based on nineteen rats and two treatments (forced exercise and control), the allocation of degrees of freedom were the following for the rate of spontaneous activity during the treatment phase: Total-~18, Treatments-~1, and Error-~17. The variance due to treatments was not signifi- cant at the 5 per cent level (F = .0668). The results of the analysis of variance are shown in Table III. The mean values for test periods one through seven are graphed in Figure 4. [500 I: 1\ / 1200 .SEDENTARY GROUP IIOO .CONTROL GROUP ‘FORCED ‘0 EXERCISE GROUP 21000 9 P- D 5", soc > uJ (I J 800 ‘ ’1 ’ {fl ’,aI' I 3 700 ”7F 2‘ Xi 600 fi, \ If soc I; W/ 400 ‘ 3 200 8 9 IO II l2 l3 l4 TEST PERIODS FIGURE 3 AVERiaE REVOLUTIOHS PER GROUP DURING THE POST-TREATMENT PHASE \ N U‘\ 75 ,L______v-, ,.-. _ 1".- ___._., see-— ._. 50 FEET PER MINUTE 45 r—~-—r 40 ~———- . CONTROL GROUP ‘ FORCED EXERCISE GROUP 35 3 4 5 TEST PERIODS TT'T‘TDJFI'." a ATI’D” A 1 ibiuiug'n‘. Fri-1;- .143 17 "1137‘ J. JL/ ALA—J OF SPOTT‘I‘AI‘TEOUS T773 7‘3? .1 "r1 :7 ['1 it; .L—JAN 37 TABLE II ANALYSIS OF VARIANCE OF DATA FOR TOTAL REVOLUTIONS OF SPONTANEOUS ACTIVITY DURING THE POST-TREATMENT PHASE Source of Sum of Mean Variation D.F. Squares Square F F.05 Total 28 9,927,862,782 Treatments 2 2,614,316,535 1,307,158,267 4.647 3.38 Error 26 7,313,546,247 281,290,240 To Test Group Means at the 5 Per Cent Level: 19,046' 21,241 740,090 Control Sedentary Forced Group Group Exercise Group Using Range Table with 26 D.F. 2 3 2.91 3.06 SE 7/2813290.240 1__+ l,+ 1__ (1) (3) 3 1o 9 1o 15,716.82 16,526.97 To Compare Forced Exercise Group with the other two groups: 40,090 23,563.03 is greater than 21,241 so, there- -16,526.97 fore, the forced exercise group is signifi- 23,563.03 cantly greater than the other two groups. To Compare Sedentary Group with the Control Group: 21,241 5,524.18 is less than 19,046 so, therefore, ~154716482 the sedentary and control groups are not 5,524:18 significantly different. TABLE III ANALYSIS OF VARIANCE OF DATA FOR RATE OF SPONTANEOUS ACTIVITY DURING THE TREATMENT PHASE Source of Sums of Mean ‘Variance D.F. Squares Square F F.05 Total 18 404.5589 Treatments 1 25.9390 25.939 1.165 4.45 ZError 17 378.6199 22.272 Based on twenty-nine rats and three treatments, the allocation of degrees of freedom were the following for the rate of spontaneous activity during the post-treatment phase: Total-~28, Treatments--2, and Error--26. The variance due to treatments was found to be signficant at the 1 per cent level (F = 11.93). The results of the analysis of variance are shown in Table IV. The means of the three groups were tested at the 5 per cent level using the multiple range test and the results indicate that the forced exercise group mean was significantly greater than either the control group mean or the sedentary group mean. The control group mean was not significantly larger than the sedentary group mean. The means for test periods eight through fourteen are graphed on Figure 5. 39 FEET PER MINUTE AVERAGE RATES O .SEDENTARY GROUP .CONTROL GROUP 0 A: TEST PERmDS FIGURE 5 F SPONTANEOUS ACTIVITY PER GROUP DURING THE POST-TREATMENT PHASE 40 TABLE IV ANALYSIS OF VARIANCE OF DATA FOR RATE OF SPONTANEOUS ACTIVITY DURING THE POST-TREATMENT PHASE —._. v... w“‘ .1:- w Source of Sums of Mean h“ H Variation D.F. Squares Square F F-VD ”-01 Total 28 2.591.1050 Treatments 2 1,240.1139 620.0570 11.93 3.38 5.54 Error 26 1,350.9911 51.9612 W To test group means at the 5 per cent level: 51.203 Sedentary Group Using Range 2 2.91 (2) 6.754 57.640 Control Group Table with 26 D.F. 3 3.06 (3) / 7.102 66.869 Forced Exercise Group 11.26.12 .1.._+..1.+.1... 3 10 9 10 To Compare Forced Exercise Group with the Other Two Groups: 66.869 "SSE: 59.767 is greater than 57.640 so, therefore, the forced exercise group mean is significantly greater than the other two groups. To Compare the Control Group with the Sedentary Group: 57.640 ”at-1% 50.886 is less than 51.203 so, therefore, he control group mean is not significantly greater than the sedentary group mean. 43 Based on nineteen rats and two treatments (forced exer- citue and control), the allocation of the degrees of freedom vnare the following for average spontaneous revolutions per exfnecise bout during the treatment phase: Total-~18, Treat~ nuants--1, and Error-~17. The variance due to treatments was rurt significant at the 5 per cent level (F 2 .001). The re- :milts of the analysis of variance are shown in Table V. (Hue mean values for test periods one through seven are graphed on Figure 6 . TABLE V ANALYSIS OF VARIANCE OF DATA FOR AVERAGE SPONTANEOUS ACTIVITY REVOLUTIONS PER EXERCISE BOUT DURING THE TREATMENT PHASE Source of Sum of Mean ‘Variation D.F. Squares Square F F.05 Total 18 28,625.1799 Treatments 1 2.2537 2.2537 .001 4.45 Error 17 28,622.9262 1,683.7015 Based on twenty-nine rats and three treatments, the allocation of degrees of freedom were the following for average spontaneous revolutions per exercise bout during the post-treatment phase. Total--28, Treatments-~2, and Error-~26. The variance due to treatments were significant at the 5 per cent level (F = 4.019). The results of the analysis of variance are shown in Table VI. The means of the three groups were tested at the 5 per cent level 42 CONTROL GROUP 1‘ WHEEL REVOLUUONS TEST PERIODS FIGURE 6 AVERAGE REVOLUTIONS PER SPONTANEOUS EXERCISE BOUT PER GROUP DURING THE TREATMENT PHASE 43 1181118 the multiple range test and indicate that the forced eauercise group mean was significantly greater than either the: control group mean or the sedentary group mean. There wens no significant difference between the sedentary greup ineeui and the control group mean. The mean values for test pensiods eight through fourteen are graphed on Figure 7. TABLE VI .ANAIXSIS 0F VARIANCE OF THE DATA FOR AVERAGE SPONTANEOUS ACTIVITY REVOLUTIONS PER EXERCISE BOUT DURING THE POST-TREATMENT PHASE m Source of _ Sum of Mean ‘Variation D.F. Squares Square F F.05 Total 28 603.9541 Treatments 2 142.5833 71.29 4.019 3.38 Error 26 461.3708 17.74 W To test group means at the 5 per cent level: 9.718 10.400 14.816w Sedentary Control Forced Group Group Exercise Group Using Range Table with 26 D.F. 3 % 2. 3.06 St =V/1 . 4 l__+ l + 1 ( (3) 3 1o 9 10 3.9 4.149 Chvdm 9 2 4 To compare forced exercise group with the other two groups: 14.816 10.667 is greater than 10.400 so therefore the - 4,149 forced exercise group mean is significantly 10. 7 greater than either the sedentary group mean or the control group mean. 44 .SEDENTARY GROUP 63 1'15 -\ -/ .CONTROL GROUP AFORCED EXERCISE GROUP Zi \ / \ ‘7 /., U) 6 \ \{ g \ > LU c: :2 2 l \ 4 \ \ \ {E II ‘ 1’ \\ I, ‘\ . , v - '3 \ / i \ / \ 10 \ / D CD 8 9 I0 II IZ 13 I4 TEST PERIODS FIGURE 7 AVERAGE REVOLUTION; PER SPONTANEOUS EXERCISE BOUT PER GROUP DURING THE POST-TREATI-IENT PHASE 45 To compare control group with sedentary group: 10.400 6.454 is less than 9.718 so therefore the control - g,%46 group mean is not significantly greater than the . 54 sedentary group mean. The coefficient of linear correlation was found to be .736 between total spontaneous activity revolutions and aver- age spontaneous activity revolutions per exercise bout. The coefficient of linear correlation was found to be .703 be- tween average spontaneous activity revolutions per exercise bout and the average rates of spontaneous activity. Discussion The results indicate that young male albino rats which were forced to exercise by swimming with a mild 0verload,in- crease their total spontaneous activity significantly as mea- sured by wheel revolutions during the post-treatment phase but not during the treatment phase. Post-sedentary rats had comparable total spontaneous activity with control rats, but the spontaneous activity of both of these two groups was significantly less than that of the forced exercise rats. Post-forced exercise rats run in spontaneous activity wheels at a significantly faster rate than control and post- sedentary rats. Control rats run in the spontaneous activity wheels at a comparable rate with post-sedentary rats. The rate of spontaneous activity of the forced exercise rats was comparable to the control rats during the treatment phase. f 40 The spontaneous activity of postuforced exercise rats consists of significantly greater average spontaneous activity revolutions per exercise bout than control or post- sedentary rats. The average revolutions per exercise bout was not significantly different between postnsedentary and control rats. The relatively high coefficient of linear correlation between total spontaneous activity revolutions and average revolutions per exercise bout indicates, in general, that if an animal runs a large number of revolutions, the average number of revolutions per exercise bout will also be larg . The reverse would also be true. The relatively high coefficient of linear correlation found between average revolutions per exercise bout and the rate of the spontaneous activity indicates, in general, that if rats run a large number of revolutions per exercise bout, their spontaneous activity rate will also be great. The reverse would also be true. Just why should a period of pre—puberty forced exer— cise with a mild overload account for greater spontaneous running of young male albino rats? The most logical assump— tion would be that the forced exercise was a stressor caus- ing adrenal and testis glands to enlarge, thereby secreting {greater amounts of steroids. It was demonstrated in pre- viously mentioned research that steroids secreted by these {glands are responsible for high levels of spontaneous activity. This cannot be the only answer because the 47 adrenal and testis glands of the forced exercise rats were not significantly larger than control rats (see appendix), yet the significant difference appears in spontaneous activity. It is assumed that a personalistic inclination to exercise develops in young rats that are forced to exer- cise, the mechanism of which is unknown at present. CHAPTER V SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS Summary The purpose of this experiment was to determine the effects of forced exercise upon the amount and intensity of the spontaneous activity of ten young male albino rats and to compare their spontaneous activity with the spontane- ous activity of ten young male albino rats which were seden- tary for a selected period of time. The rats in the sedan- tary group were allowed but sedentary activity for the first half of the experiment and were allowed spontaneous activity for the final half. The rats in the forced exercise group were forced to exercise by swimming with the overload method for thirty minutes each day for the first half of the experiment and during the final half were allowed spon— taneous activity with no forced exercise. Ten rats were assigned to the control group which were allowed spontaneous activity during the entire experiment. The experiment ran for seventy consecutive days. All rats were of the Spraguc- Dawley strain. Spontaneous activity was measured daily for each individual rat by mechanical revolution counters that were attached to their cages. These data were recorded daily. The intensity of Spontaneous activity was measured by six spontaneous activity cages equipped with microswitches. 11511“le 49 The microswitches were wired through a relay box to signal magnets Which recorded an ink mark for each Wheel revolution on a continuously moving monodrum. The individual rats from the various groups were placed on a rotation schedule so that each rat was in a microswitch-equipped cage once for a 24-h0ur period every five days. Spontaneous activity intensity data were recorded upon analysis of the monodrum papers. Intensity data included the average speed in feet per minute that the spontaneous activity wheel turned and the average number of wheel revolutions per exercise bout. The results indicated that young male post-forced exercise rats ran, spontaneously, a significantly greater number of total revolutions, ran these revolutions at a significantly faster rate per revolution, and had signifi- cantly greater numbers of revolutions per exercise bout than either the post-sedentary or control group rats. There was no significant difference between control rats and post- sedentary rats in the amount and intensity of spontaneous activity. A relatively high coefficient of linear corre- lation, .736, was found between total spontaneous activity revolutions in exercise bouts and the average number of spontaneous activity revolutions per exercise bout. A relatively high coefficient of linear correlation, .703, was also found between the average number of spontaneous activity revolutions per exercise bout and the average rate of spontaneous activity. pi . hr:- C‘OI ”TIT“ ’3 e. 3. L\/ 1. PO swimming the ROGY ficantly ole albino rats forced to exercise by with a mild overload (2 per cent of weight ended), participate more signi~ in spontaneous running than sedentary and control mitts, running at a 3152; 11131 lozu‘itly faster rate r. and gre atcr distance each ruLI. Young male alt ino sedan w.;y rats participate comparahly in sponta sous running with con" trol rats, running at a comparable rate and distance i. ,- a. . grea USI' each run. In general, young male albino rats run a “istance each run when they partici« pate more in Spontaneous runni1c and thGY distance n.dation Research exercise ‘1 J. faster rate wlien they run a greater V each run. should be done varying the forced overload weights to determine effects upon post-forced exorcise spontaneous activity, Research should be done varying the pe eriods of force d e: :ercis se to deto rminc effects upon postwforced exercise spontaneous activity. 81 uld be done with treadmill running llllllllli‘il‘illl‘lllll. 5. 8. 51 for the forced exercise. Research should be done comparing the post-forced exercise, control, and post-sedentary spontaneous activity to toe aritais' growth patterns. Research shOuld be done with animals that are mature at the beginning of the experiment to determine the effects of forced exercise and sedentary activity upon their post-treatment spontaneous activity. Research should be done to determine the minimum amount of forced exercise necessary to maintain the high levels of spontaneous activity that are established during the post-forced exercise period. Research should be done to test whether there is a difference between groups in their adaptability to a stressor. Research should be done with humans, studying m the effects of forced exercise, control, and sedentary activity on their post—treatment spontaneous activity. BIBLIOGRAPHY 1. 5. 9. 10. BIBLIOGRAPHY Brobeck, John R. "Effects of Variations in Activity, Food Intake and Environmental Temperetire 01 i*it Gain in the Albino Rat, " The Americe n IDE‘4“L of Physiology, 143: 1- -5, January, 1945. Browman, Ludvig G. "Light in its Relationship to Activity and Estrous Rhythms in the Albino Rat," Journal of Experimental Zoology, 75: 375~388, April, 1937. Browman, Ludvig G. "The Effect of Bilateral Optic Enucleation on the Voluntary Muscular Activity of the Albino Rat, " Journal of Experimental Z--io J, 91: 331- ~344, December, 1942. Browman, Ludvig G. "Effects of Controlled Temperature Upon the Spontaneous Activity Rhythms of the Albino Rat," Journal g; Comparative Psychology, 56: 33-46, August, 1943. Browman, Ludvig G. "Effects of Controlled Temperature Upon the Spontaneous Activity Rhythms of the Albino Rat, " Journal of Experimental Zoolo , 94: 477-489, December, 1943. Browman, Ludvig G. "Modified Spontaneous Activity Rhythms in Rats," The American Journal of Pngsigipgv. 142: 633-637. December, 1944? Gaetan, Jasmin and Pierre Boes. "Effect of Centrally Acting Drugs on Muscular Exercise in Rats," Canadian Journal of Biochemistry and Physiology, 37: 417-423, June, 1959. Gertz, Boris. "The Effect of Handling at Various Age Levels on Emotional Behavior of Adult Rats," Journal of Comparativ_gths siological PsycholO“y, 50: 613-676, December, 1957. Griffiths, W. J. Jr. "Responses of Wild and Domestic Rats to Forced Swimming," Psychological Reports 6: 39- 49, February, 1960. Heller, Richard E. "Spontaneous Activity in Male Rats in Relation to Testis Hormone," Endocrinology, 16: 626-632, November, 1932. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 54 Hitchcock, F. A. "Studies in Vigor: The Comparative Activity of Male and Female Albino Rats," The American Journal Lf Physiolggy, 75: 205-210, December, 1925. Hunt, J. and H. Schlosberg. "General Activity in the Male Albino Rat, " Journal Lf Comparative PsypholOW 28: 23-38, August, 1939. Jones, D. D., D. J. Kimeldorf, D. O. Rubadeau, and T. J. Castanera. "Relationships Between Volitional Activity and Age in the Male Rat," The American Journal 9; Physiology, 172: 109- 114_ January, 1953. Lee, M. O. and E. F. Van Buskirk. "The Effect of Throidectomy on the Spontaneous Activity in the Rat with a Consideration of the Relation of the Basal Metabolism to Spontaneous Activity," Th3 Amegican qurna; Lf Physiology, 84: 321-329, March, 192 McClelland, W. J. "Differential Handling and Weight Gain in the Albino Rat," Canadian Journal Lf Psychology, 10: 19- 22, March, 1956. Montoye, Henry J., Richard Nelson, Perry Johnson, and Ross MacNab. "Effects of Exercise on Swimminge Endurance and Organ Weight in Mature Rats," Research Quayterly, 32: 434-439, October, 1965: Oppenheimer, E. H. and R. A. Spaeth. "The Relation Between Fatigue and the Susceptibility of Rats Toward a Toxin," The American Journal 9; Hygiene, 2: 51-62, January, 1922. Pillac, K. C. S. and K. V. Ramachandran. "On the Distribution of the Roles of the ith Observation in an Ordered Sample from a Normal POpulation to an Independent Estimate of the Standard Deviation," Annals g; Mathematical Statistics, 25: 565-572, 1954. Price-Jones, Cecil. "Effect of Forced Exercise Upon the Skeletal Deve10pment in White Rats," Quarterly Journal qugxperimentg; Physiology, 16: 61- 8 March, 1926. Richter, Curt P. "A Behavioristic Study of the Activity of the Rat," Comparative Psychology_Monographs, 1: 1-559 1922. Richter, Curt P. "Animal Behavior and Internal Drives," Quarterly Review 9; Biolo , 2:307-343, September, 1927. 22. 23. 24. 25. 26. 27. 28. 29. 300 31. 32. 33. 55. Ruchter, Curt P. and E. H. Uhlenhuth. "Comparison of the Effects of Gonadectomy on Spontaneous Activity of Wild and Domesticated Norway Rats," EndocrinolOgy, 54: 311-322, March, 1954. Richter, Curt P. and C. H. Wang. "New Apparatus for Measuring the Spontaneous Motility of Animals," Journal of Laboratory an Clinical Medicine, 12: 289-292, December, 192 . Rundquist, E. A. "Inheritance of Spontaneous Activity in Rats," Journal of Comparative Psychology, 16: 415-438, December, 1933. Scheffe, Henry. "A Method for Judging All Contrasts in the Analysis of Variance," Biometrika, 40: 68- 83, June, 1953. Selye, Hans. The Stress of Life. New York: McGraw- Hill Book Company, 1953, pp. 1-326. Shirley, Mary. "Studies of Activity: I. Consistency of the Revolving Drum Method of Measuring the Activity in Rats," Journal of Comparative Psychology, 8. 23-38, January, 1928. Shirley, Mary. "Studies in Activity: II. Activity Rhythms; Age and Activity; Activity'After Rest," Journal of Comparative Psychology, 8: 159-186, May, 1928? Siegel, Paul S. "Activity Level as a Function of Physically Enforced Inaction," Journal 9; Psychology, 21: 285-291, April, 1943. Siegel, Paul S. and Irving E. Alexander. "A Further Observation on the Effect of Physically Enforced Inaction on the Activity Level of the Rat," Journal of Genetic Psycho ology, 72: 57-62, January, 1958. Slonaker, James Rollin. "The Normal Activity of the White Rat at Different Ages," The Journal of ggmparative Neurological_§sychol_gy, 17: 342- -359, July, 1907. Slonaker, James Rollin. "Description of an Apparatus for Recording the Activity of Small Mammals," The Anatomical Record, 2: 116-122, June, 1908. Slonaker, James Rollin. "The Effect of a Strictly Vegetable Diet on the Spontaneous Activity, the Rate of Growth, and Longevity of the Albino Rat," Leland Stanford Jr. Qniveysity Publications, April 2, 1912, pp. 1-52. 34. 35. 36. 37. 38. 39. 40. 41. 42. 56 Slonaker, James Rollin. "Analysis of Daily Activity of the Albino Rat," The American Journal p; Slonaker, James Rollin. "The Effect of Pubescence, Oestruation and Menopause on the Voluntary Activity of the Albino Hat," The American Journal 9; Physiology, 68: 294-373, April, 1924. Slenaker, James Rollin. "Long Fluctuations in Volun- tary Activity of the Albino Rat," The Americap Journal p; Physiologl. 77: 503-508, August, 1926. Smith, Erma A. and R. M. Conger. "Spontaneous Activity in Relation to Diet in the Albino Hat," 1%% American Journal 9; Physiology, 142: 663-. 5, December, 19 . Stone, Calvin P. and Roger G. Barker. "Spontaneous Activity, Direct and Indirect Measures of Sexual Drive in Adult Male Rats," Society :2; Experipentgl Biology app Medicine Proceedings, 32: 195-199, October, 193 . Thomas, Barbara M. and A. T. Miller, Jr. "Adaptation to Forced Exercise in the Rat," T e er Journal 2; Physiology, 193: 350-35 , May, 1958. ’Weininger, 0., W. J. McClelland, and R. K. Arima. "Gentling and Weight Gain in the Albino Rat," Canadian Journal p£_Psychology, 14: 219-224, September, 1954. Never, E. G. "Water Temperature as an Incentive to Swimming Activity in Albino Rats," Jourpgl 2; Comparative Psychology, 14: 219-224, October, 1932. Wang, C. H. "The Relation Between Spontaneous Activity and Oestrous Cycle in the White Rat," Comparatiye Psychology Monographs, 2: 1-27, 1923. APPENDIX APPENDIX A 59 esm.m moms qua.m mmma mpm.¢ qwmm non.e emmm moo.m mmem .z.¢ m 44m.m .wpe mm¢.n mmsm me.¢ ommm mmm.o .mas mmm.¢ ”mam .z.¢ e mmm.m ms.m amm.m mam, s_m.¢ mmmm mam.n mmmm mma.m omwm .2.« n nsm.s smmm omn.¢ mmmm oo..¢ .s_m pnm.a mmm, nmr.. moo_ .:.4 m mms.m can» _mo.m m_m¢ nom.m mama use.“ moor ms¢.¢ FPOA .z.¢ a wow.., muem amm.o_ mmsm mms.m emme 4mm.m msmm mm4.m mam» .:.m m- ope.» mmmm mms.m mmmn mmm.m pawn m¢¢.m ammo mmm.» mm.» .:.m "_ mFm.m mpme meo.m memo mpm.n mwmm 0.,.m wmmm oFo.m smmw .2.m o" m¢¢.m seas mmo.m mm": omw.w msmn mmm.m some mmo.m omen .s.m m mam.» seem mmm.m seam mwm.s 04,4 mmw.m mmam amm.m mmsm .z.m m mms.¢ momm 0.5.4 44mm mmm.o msnn sme.s mama oo_.¢ when .z.m a mom., msm— m~¢.m "mom 4F,.n mama mom.» come 40>.m mmmm .2.m o .on.m mnsa mmm.m maem mmo.m “on" smo.m mmnm was.» mmmm .:.m m ¢m¢.m momm moo.m moms 5mm.» memn mom.n oomm mwmwoa comm .:.m e mm¢.> momm 5.5.» mmmm mmp.m mm.m mmm.¢ amen mem.¢ sows .z.m m am¢.m nmma mam.m memm oa4.m, mom? o_s.. mn._ ma..m mwwm .z.m m mem. npe mm,.- "mm m.¢._ we» mmm. who mm_.. nae, .2.m . ens. awn mum. mms osm. new mop." ems mms. mom 2002 m. own. mam mos. smm Fan. mom 4mm. m¢4 men. own .2.« PF mom. nnm amm.- mPN, osm. he. mm¢._ mom mam. ppm .2.4 o— m_¢. ¢.n mam.w mom moo._ anm mmm.r com me.F «ma, .2.« m, meo._ ems mnm.m ommm nmm. mes 04s.. mmpw mam.F onm_ .z.« m omq. mnm s.n.. mso_ .mm.. 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O DJ E ’— SEDENTARY .GROUP .CONTROL GROUP Exsscxss ‘FORCED N SNOUOWOABU 133HM WViOi 50 iNBOHBd FIGURE 9 SPONTAIEOUS ACTIVITY PATTERNS — PER CENT OF TOTAL REVOLUTIOUS PER HOURLY PERIOD FOR POST-TREATMENT PHASE APPENDIX B ORGAN WEIGHTS PER BODY WEIGHT PER GROUP AT THE TERMINATION OF THE TREATMENT PHASE 63 TABLE VIII ANALYSIS OF VARIANCE OF DATA FOR ADRENALS/BODY WEIGHT W Source of Sums of Mean Variation D.F. Squares Square F F.05 Total 14 125,025,473 Between 2 57,614,461 28,807,230 5.13 3.89 Within 12 67,411,012 5,617,584 H 'm. c-A To Test Group Means at the Five Per Cent Level: W av—w r 'v ,' aw 7'7 7—7 .0001123 I» WIOOO14853TWHT .0015759 ' Sedentary Control Forced Exer- Group Group cise Group Using Range Table with 12 D.F.: “1* 2 3 1 3.08 3.23 35 z/W (2) (3) 5 .000032648 .00003424 To Compare Forced Exercise Group with Other Two Groups: .00015759 .00012335 is greater than .00011223 so the - 0000 424 forced exercise group mean is significantly .00012335 greater than the sedentary group mean. .00015759 .00012494 is smaller than .00014853 so the -,00903262 control group mean is not significantly .00012 9 smaller than the forced exercise group mean. To Compare the Control Group With the Sedentary Group: ..OOO14853 .00011588 is larger than .00011223 so there- -.OOOO3263 fore the control group mean is significantly .0001158 larger than the sedentary group mean. 64 TABLE Ix ANALYSIS OF VARIANCE or DATA FOR HEART/BODY WEIGHT Source of Sums of Mean Variation D.F. Squares Square F F.05 Total 14 12.753 Between 2 6,018 3.009 5.36 3.89 within 12 6.735 .561 To Test Group Means at the Five Per Cent Level: .0034OV W '7 .00355 w .00388 Control Sedentary Forced Group Group Exercise Group Using the Range Table with 12 D.F.: 2 3 3.08 3.23 SE = V/,0000000561 5 . To Compare Forced Exercise Group with Other Two Groups: .00388000 .00352 is greater than .00340 so therefore -,OOO§58E§ the forced exercise group mean is Signifi- .OO3521 7 cantly greater than the control grOup mean. .00388000 .00354 is smaller than .00355 so therefore -,00034188 the sedentary group mean is not significantly .00353 12 smaller than the forced exercise group mean. To Compare the Sedentary Group with the Control Group: .00355 .00231 is smaller than .00340 so therefore -,OOO34 the control group mean is not significantly .00321 smaller than the sedentary group mean. 65 TABLE X ANALYSIS OF VARIANCE OF DATA FOR TESTES/BODY WEIGHT Source of ' Sum of Mean Variation D.F. Squares Square F _ F.05 F.01 Total 14 .OOOO149599 Between 2 .0000086035 .OOOOO430175 8.12 3.89 6.93 Within 12 .OOOOO63564 .00000052970 W To Test Group Means at the Five Per Cent Level: V v7 .01024* ’* T' .01723' “”T “’ *“W”" .01209 Sedentary Control Forced Group Group Exercise Group Using Range Table with 12 D.F.: 2 3 3.08 3.23 SD f/AQQQQQQEEEZ. (2) (3) 5 .00100100 .00104975 To Compare Forced Exercise Group with Other Two Groups: .01209 .01104 is greater than .01024 so therefore the -,OO1OE forced exercise group mean is significantly . 11 greater than the sedentary group mean. .01209 .01109 is less than .01128 so therefore the -,OO1OO control group mean is not significantly less .01109 than the forced exercise group mean. To Compare Control Group with Sedentary Group: ,.01128 .01028 is greater than .01024 so therefore the - 00100 control group mean is significantly greater .51028 than the sedentary group mean. 66 TABLE XI ANALYSIS OF VARIANCE OF DATA FOR SPLEEN/BCDY WEIGHT Source of Sum of Mean Variation D.F. Squares Square F F.05 Total 14 .OOOOOO2550 Between 2 ,OOOOOOOO13 .00000000065 .0031 3.89 Within 12 .OOOOOO2537 .OOOOOOO2114 TABLE XII ANALYSIS OF VARIANCE OF DATA FOR KIDNEYs/BCDY WEIGHT Source of Sum of Mean Variation D.F. Squares Square F F.05 .Total 14 .OOOOO69056 Between 2 .0000007501 .0000003751 .73 3.89 Within 12 .0000061554 .0000005130 m waffi: . E * hf W ‘ ‘fifw TABLE XIII ANALYSIS OF VARIANCE OF DATA FOR LIVER/BODY WEIGHT Source of Sum of Mean Variation D.F. Squares Square F F.05 Total 14 .0001696610 Between 2 .OOOO108859 .OOOOO2443O .18 3.89 'Within 12 .0001587751 .00001322313 2925 Sam '33 '3 11, 29m; Aoom T1. .3 L mm.ummxm .dMUmOu Emu 2925 30m 3.0. .3 nomhzoo 1.0 2%; Sam >mdhzmomm -.m 22»; Sam TIL. 3 2925 Sam \29554 TI 0:? A ‘ A ‘17 R1: I 1 Ad '-1 All. A T 7 UP R GRO’ P‘EASE PT.“ ~4 ._J I L ‘TT '7 17‘ ..—~ {'1 I; -\ .‘u' [L w-w H—T TRtAT.-::L SWVUS 1 v V .f , .5. R BOD OF 7" LJ ‘1 :T3 P r171» ORG-AT ’.‘~ LI- OJ (up v. moOEma Emmi. n_ m_ __ O_ m S A- my .. Q m N m 00. \ 11 \\ mu. 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OOCDNmU‘l-F-‘UIU—A 1 2 3 Rev. in 891 1642 2791 1391 3133 1141 1569 1112 891 444 937 1881 1409 1846 1231 1273 2086 1246 691 1665 561 1377 264 1087 1007 554 1078 965 1095 574 502 1678 762 90 131 128 92 147 91 103 107 67 51 90 112 92 127 119 91 135 119 122 66 89 46 112 108 93 93 87 95 65 64 109 68 Rev./ Total mm./ 9.90 12.53 21.80 15.12 21.31 12.54 15.23 10.39 13.30 8.71 10.41 16.80 15.32 14.54 10.34 13-99 15.45 10.47 9.33 13.65 8.50 15.47 5.74 9.70 9.32 5.96 11.59 11.09 11.53 8.83 AWN o o o mulCD dKOJ.‘ d—-. 1142 2071 3291 1671 3528 1231 1847 1398 1272 703 1234 2201 1893 2301 1446 1549 2111 1792 1015 1979 806 1446 387 1405 1352 824 1167 1010 1278 751 687 1772 998 mm, Rev: 1.28 1.26 1.18 1.20 1.13 1.16 1.18 1.26 1.43 1.58 1.32 1.17 1.34 1.25 1.18 1.21 1.01 1.44 1.47 1.19 1.44 1.05 1.47 _ 1.29 1034 -‘ 1.49 1.08 1.05 1.17 1.31 1.37 1.06 1.31 Intensity Data for Treatment Phase (continued) Control Group 82 Forced Ezerggse Group —b an. O\OCI)'\1 O\U'I4> OOQNOU‘I-PUM... O\O(I)‘\]O\U14>U41\)_s Rev. in Rev./ Animal Bouts gouts Bout 1637 136 12.04 359 58 6.19 371 58 6.40 900 116 7.76 232 50 4.64 540 61 8.85 1010 71 14.22 814 84 9.69 346 38 9.10 1411 96 14.70 1421 146 9.73 557 73 7.63 381 46 8.28 1232 144 10.81 38 9 4.22 1030 109 9.45 1776 81 21.93 408 47 8.68 689 57 12.09 4140 114 36.32 2329 119 19.57 299 52 5.75 451 41 11.00 600 71 8.45 403 46 8.76 3375 122 27.66 826 67 12.33 635 79 8.04 215 30 7.17 1729 93 18.59 3198 138 23. 17 324 53 6.11 1121 105 10.68 532 51 10.43 680 61 11.15 4758 192 24.78 1997 89 22.44 —§ OOCD'NIOU'l-P'UJI'D... Rev. 'in Rev./ Total —————————p———————————u——-——_ Total mm./ mm. Rev. 2058 1.26 646 1.80 465 1.25 1161 1.29 523 2.25 708 1.31 1502 1.49 901 697 1431 1909 685 513 1530 60 1268 1972 Test Period VI 584 882 3593 2459 284 609 736 602 3811 1279 Test Period VII 657 297 1555 3272 339 1196 593 871 4706 2041 1.11 2.01 1.01 1.34 1.23 1.35 1.24 1.58 1.23 1.11 1.43 1.28 .87 1.06 .95 1035 1.23 1.49 1.13 1.55 1.04 1038 .90 1.02 1.05 1.07 1.12 1.28 .99 1.02 d d OJ Test Period oem-xlom-t-‘wmd O\OCD'\]O\U‘I4-‘U1\)—c oeoofiomewm... 706 408 1430 1430 388 1176 664 121 650 277 368 679 539 239 553 669 187 378 543 554 792 355 786 940 521 592 243 455 558 436 1063 775 384 732 869 600 280 71 81 125 92 45 86 54 20 50 49 37 77 72 23 68 30 82 65 57 59 75 61 46 62 51 47 9.94 5.04 11.44 15.55 8.62 13.67 12.30 6005 13.00 5.65 9.95 8.82 7.49 10.39 12.02 9.84 6.23 7.27 11.55 7.69 15.23 9.86 8.83 14.03 10.01 12.08 8.39 5.50 8.58 7.65 18.02 10.33 6.30 15.91 14.02 11.77 5.96 1753 1575 487 1312 706 211 589 465 469 900 847. 241 608 766 211 586 698 690 851 538 848 924 623 653 241 720 618 727 1143 1031 392 741 950 641 286 1.06 1.74 .91 1.68 1.27 1.32 1.01 1.10 1.14 1.13 1.55 1.28 1024 1.07 1052 1.08 .98 1.20 1.10 .99 1.58 1.11 1.67 1.08 1.33 1.02 1.01 1.09 1.07 1.02 83 no. eee en.w ee mom 0. ew.w mwe mw.ww mm wne ow ww._ eoo wo.o em emm ow o_.w oen eo.w o4 wen o wo.w mwno wo.mm oe— wowo o no.— ooe mn.w no mwn o wo.w enww no.m_ mw. wmww e n¢.w mow. oe.w, nw moo e wo.w wew oe.w wm mnw e mw.w wnn mw.e mn eem w en.w mo: oo.e .4 men w om.. weww ww.o oe mwe w wm._ nmm_ om.o oww mwm— e ww._ woe ew.o 06 won e wn.w ooe we.ow we eme e oe.w em ww.n ew mm m eo.w eon mo.e we new m oo.— wmo we.e oe mnm m oo. oww— w¢.ow 4e evww e no.w emon ww.nn ee nwow e e¢.w wwow ww.o_ we mee e om. 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