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The Effect of Exercise on Nutrient Utilization with Special Reference to Calcium¹

Animal Nutrition Laboratory, Cornell University, Ithaca, New York

Balance studies were conducted using adult male dogs to investigate the effect of exercise on nutrient utilization with particular reference to calcium. The animals were exercised on a motor-driven treadmill immediately after and one hour subsequent to consuming diets relatively high in either protein, fat or carbohydrate.

A highly significant decrease in the apparent absorption of calcium was observed during the exercise periods. Urinary excretions and retentions of calcium, phosphorus or nitrogen were not significantly different during the exercise. The utilization of dry matter, ether extract and carbohydrate also were not influenced by the level and duration of exercise imposed in this study. There were no apparent diet and exercise interrelationships.

The physiological responses to exercise and their probable effects upon calcium utilization are briefly discussed as well as the relationship of fat in the diet to calcium absorption.

² Data taken from a part of a Ph.D. thesis submitted to the Faculty of the Graduate School of Cornell University. Present address: U.S. Naval Radiological Defense Lab., San Francisco.

Manuscript received 15 January 1960.