Effects of chromium and resistive training on muscle strength and body composition
作者:
HALLMARK MELISSA,
REYNOLDS THOMAS,
DeSOUZA CHRIS,
DOTSON CHARLES,
ANDERSON RICHARD,
ROGERS MARC,
期刊:
Medicine and Science in Sports and Exercise
(OVID Available online 1996)
卷期:
Volume 28,
issue 1
页码: 139-144
ISSN:0195-9131
年代: 1996
出版商: OVID
关键词: ERGOGENIC AIDS;TRACE MINERALS;ANABOLISM;INSULIN ACTION
数据来源: OVID
摘要:
Sixteen untrained males (23 ± 4 yr), were studied to determine the effects of chromium (Cr) supplementation (200 μg · d-1) and a 12-wk resistive exercise training program on muscle strength, body composition, and Cr excretion. The subjects trained 3 times per week with two sets of 8-10 repetitions at 90% of 1 repetition maximum using Keiser variable resistance machines. Food records were used to estimate Cr intake (≈36μg · d-1), energy intake, and the percent kJ from protein. The resistive training program resulted in significant increases in total body muscular strength in both the Cr and placebo groups (24% and 33%;P< 0.05). Body weight, percent body fat, lean body mass, and skinfold thicknesses were unchanged in either group after resistive training. Cr excretion increased in the Cr group after 6 wk of Cr supplementation (0.15± 0.08 vs 1.52 ± 1.26 μg · d-1;P< 0.01) and remained higher at 12 wk of training (2.03 ± 1.73). These results indicate that Cr supplementation, in conjunction with a progressive, resistive exercise training program, does not promote a significant increase in strength and lean body mass, or a significant decrease in percent body fat. Cr supplementation results in a significant increase in Cr excretion that is not altered by resistive training.
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