Body composition changes in obese and lean men during physical conditioning

Abstract
Twenty-three college men participated in a running and walking conditioning program five days per week for nine weeks. Subjects were categorized into the following groups based on their relative fatness; an obese group ranging in fatness from 25%–46% (N=8), and a lean group ranging in fatness from 10%–21% (N=15). The approximated energy expenditure prescribed for each subject was estimated to be 600 keal per day of physical conditioning. No attempt was made to control the diet. During the physical conditioning interval significant decrements in body fat and increments in fat-free body weight were observed for both groups in anthropometric, densitometric and hydrometric analyses of body composition. The sum of ten subcutaneous fat measures decreased. Body density increased. Relative total body water increased while extracellular water remained relatively constant suggesting an increase in the intracellular water compartment. Total blood volume and plasma volume did not significantly change. Although the average body composition changes in the obese group were larger, the differences in the mean changes between the groups were relatively similar. A discrepancy was found between the estimated energy expended during exercise and the energy lost due to changes in body composition.

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