Body composition in 70-year-old adults responds to dietary beta-hydroxy-beta-methylbutyrate similarly to that of young adults.
| Autor: | Vukovich, Matthew D., Stubbs, Nancy B., Bohlken, Ruth M., Vukovich, M D, Stubbs, N B, Bohlken, R M |
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| Předmět: |
HEALTH of older people
EXERCISE HUMAN body composition ADIPOSE tissues AGING BODY composition COMPARATIVE studies COMPUTED tomography DIETARY supplements RESEARCH methodology MEDICAL cooperation PLACEBOS RESEARCH STATISTICAL sampling SKINFOLD thickness WEIGHT lifting EVALUATION research RANDOMIZED controlled trials BLIND experiment SKELETAL muscle PHOTON absorptiometry SHORT-chain fatty acids |
| Zdroj: | Journal of Nutrition; Jul2001, Vol. 131 Issue 7, p2049-2052, 4p, 3 Diagrams, 1 Chart |
| Abstrakt: | Studies in young adults have demonstrated that beta-hydroxy-beta-methylbutyrate (HMB) can increase gains in strength and fat-free mass during a progressive resistance-training program. The purpose of this study was to determine whether HMB would similarly benefit 70-y-old adults undergoing a 5 d/wk exercise program. Thirty-one men (n = 15) and women (n = 16) (70 +/- 1 y) were randomly assigned in a double-blind study to receive either capsules containing a placebo or Ca-HMB (3 g/d) for the 8-wk study. Skin fold estimations of body composition as well as computerized tomography (CT) and dual X-ray absorptiometry (DXA) scans were measured before the study and immediately after the 8-wk training program. HMB supplementation tended to increase fat-free mass gain (HMB, 0.8 +/- 0.4 kg; placebo, -0.2 +/- 0.3 kg; treatment x time, P = 0.08). Furthermore, HMB supplementation increased the percentage of body fat loss (skin fold: HMB, -0.66 +/- 0.23%; placebo, -0.03 +/- 0.21%; P = 0.05) compared with the placebo group. CT scans also indicated a greater decrease in the percentage of body fat with HMB supplementation (P < 0.05). In conclusion, changes in body composition can be accomplished in 70-y-old adults participating in a strength training program, as previously demonstrated in young adults, when HMB is supplemented daily. [ABSTRACT FROM AUTHOR] |
| Databáze: | Complementary Index |
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