Effects of Exercise and Dietary Protein Levels on Body Composition in Humans
LETTERMAN ARMY INST OF RESEARCH PRESIDIO OF SAN FRANCISCO CA
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Two levels of protein 200 and 100 gmday were fed to two groups of young adults who exercised strenuously for 40 days. From body volume, total body water mass, 40 K whole body counting, and potassium balances, it was determined that the 2.10 kg gain in body weight in Group I subjects 200 gm of proteinday reflected 0.67, 2.42, and 0.22 kg gains of dry protein, water, and mineral, respectively, with a 1.21 kg loss of body fat. Lesser gains of 0.39 kg of dry protein, 1.46 kg of body water, and 0.13 kg of mineral were observed in Group II, with a 1.09 kg loss of body fat. Minimal changes were noted in several anthropometric girths, and arm and scapular skinfolds. Although higher dietary intakes resulted in small increments in nitrogen and potassium retentions, intakes of 100 grams of protein per day were sufficient for positive nitrogen balances and appeared to be adequate for men during strenuous physical activity.
- Medicine and Medical Research