Actions for A BEHAVIORAL MODEL FOR QUANTIFYING PHYSIOLOGIC ADJUSTMENTS OF FOOD INTAKE, BODY WEIGHT AND BODY COMPOSITION TO INCREASED EXERCISE IN RATS

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A BEHAVIORAL MODEL FOR QUANTIFYING PHYSIOLOGIC ADJUSTMENTS OF FOOD INTAKE, BODY WEIGHT AND BODY COMPOSITION TO INCREASED EXERCISE IN RATS

Author
MCCAMISH, MARK ANTHONY
Physical Description
146 pages
Additional Creators
Pennsylvania State University
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Summary
An apparatus was developed to combine behavioral stimulation to exercise with capabilities to gather concurrent data regarding food intake, body weight, body composition, metabolizable energy and feeding behavior. This experimental model was designed, constructed and tested. Linear regression techniques were combined with carcass analyses to estimate initial body composition of the experimental animals. Four male Wistar rats (278.3 - 284.4 g) were randomly selected and enclosed in separate complete metabolic chambers containing torqued Wahmann running wheels. The animals were behaviorally stimulated to run and quantitative collection of expired CO(,2), feces and urine was initiated. The carbon-nitrogen balance technique was combined with regression analyses to determine changes in body composition of the exercised animals. Metabolizable energy intake, heat production and feeding patterns were also monitored.
The behavioral contingency significantly increased running performance. The exercised animals gained weight while maintaining initial fat stores. Total content of all body components, with the exception of fat, increased significantly. The relative percentage of body fat tended to decrease but the decrease was not statistically significant. Increased exercise significantly increased heat production up to a plateau of 184.5 kcal/day/W(,kg)('.75).
Sufficient data were gathered to permit discussion of each individual animal and its adaptations and responses to the running contingency. Sequential body composition changes throughout each individual adaptation were documented using the combined carbon-nitrogen balance technique. The validity of the combined total methodology was confirmed. Future implications of utilizing this model as an investigative tool in the areas of stress, growth, retirement and obesity were discussed. Use of the wheel-food chamber system with the running contingency is proposed as an effective model which parallels the natural environmental niche of the animals where activity is required to procure food.
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Dissertation Note
Ph.D. The Pennsylvania State University 1980.
Note
Source: Dissertation Abstracts International, Volume: 41-10, Section: B, page: 3743.
Part Of
Dissertation Abstracts International
41-10B
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