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DIETARY RESTRICTION DURING MAINTENANCE RESISTANCE TRAINING PRODUCES LOSS OF LEAN BODY MASS IN STRENGTH-TRAINED MEN 184

1996; Lippincott Williams & Wilkins; Volume: 28; Issue: Supplement Linguagem: Inglês

10.1097/00005768-199605001-00184

1530-0315

T. D. Gomez, P. A. Mol, C. N. Meredith, R. Gregorek,

Body Composition Measurement Techniques

This study tested the hypothesis that strength-trained (ST) men engaging in a maintenance regimen of high-intensity resistance exercise (RE) can lose fat while preserving lean body mass (LBM) during dietary restriction (DR). The effect of DR on body composition (BC) was examined and compared in 9 recreational ST men (RE 4.8 ± 0.2 hrs/wk, mean ± SEM) and 7 untrained men, aged 21 to 35 years. The ST and UT groups were matched for body mass (BM: 78.9 ± 3.6 & 82.8 ± 3.3 kg for ST & UT, respectively), height (177.0 ± 2.7 & 181.4 ± 2.6 cm) and non-RE physical activity (PA: 3.0 ± 1.0 & 3.0 ± 1.7 hrs/wk). During a 7-day baseline period, habitual dietary intake, RE and PA patterns were characterized and BM, BC and resting energy expenditure (REE) were measured. Subjects then reduced energy intake for 26 days while maintaining normal RE & PA patterns. Following the DR intervention, BM, BC and REE measurements were repeated. Baseline energy intake (2794 ± 139 & 2564 ± 183 Kcal/d) and DR (820 ± 102 & 1003 ± 189 Kcal/d) were not different (p>0.05). ST subjects were more lean initially than UT subjects (fat 14.1 ± 1.6 vs. 23.4 ± 2.6% by hydrostatic weight, p < 0.005). DR produced similar mass loss between groups (p > 0.05); 3.6 ± 0.4 Kg for ST (p < 0.0001) and 3.6 ± 0.5 Kg for UT (p < 0.0005). Composition of mass loss included similar losses of body fat and LBM (p > 0.05) with 61 ± 4.8 & 63 ± 8.8% BM loss as fat (p < 0.0001) and 39 ± 4.7 & 37 ± 8.7% BM loss as LBM (p < 0.0001). REE did not significantly change with mass loss. Initial body mass was positively correlated with the proportionion of mass lost as fat(r = 0.590, p<0.05) and total fat loss (r = 0.594, p <0.05). The results of this study indicate that maintenance RE does not preserve lean body mass in strength-trained men during dietary restriction.