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-   -   Effect of Two Different Weight-loss Rates on Body Composition in Elite Athletes. (http://www.catalystathletics.com/forum/showthread.php?t=6505)

Darryl Shaw 01-27-2012 01:44 PM

Effect of Two Different Weight-loss Rates on Body Composition in Elite Athletes.
 
Quote:

Effect of two different weight-loss rates on body composition and strength and power-related performance in elite athletes.

Abstract


When weight loss (WL) is necessary, athletes are advised to accomplish it gradually, at a rate of 0.5-1 kg/wk. However, it is possible that losing 0.5 kg/wk is better than 1 kg/wk in terms of preserving lean body mass (LBM) and performance. The aim of this study was to compare changes in body composition, strength, and power during a weekly body-weight (BW) loss of 0.7% slow reduction (SR) vs. 1.4% fast reduction (FR). We hypothesized that the faster WL regimen would result in more detrimental effects on both LBM and strength-related performance. Twenty-four athletes were randomized to SR (n = 13, 24 3 yr, 71.9 12.7 kg) or FR (n = 11, 22 5 yr, 74.8 11.7 kg). They followed energy-restricted diets promoting the predetermined weekly WL. All athletes included 4 resistance-training sessions/wk in their usual training regimen. The mean times spent in intervention for SR and FR were 8.5 2.2 and 5.3 0.9 wk, respectively (p < .001). BW, body composition (DEXA), 1-repetition-maximum (1RM) tests, 40-m sprint, and countermovement jump were measured before and after intervention. Energy intake was reduced by 19% 2% and 30% 4% in SR and FR, respectively (p = .003). BW and fat mass decreased in both SR and FR by 5.6% 0.8% and 5.5% 0.7% (0.7% 0.8% vs. 1.0% 0.4%/wk) and 31% 3% and 21 4%, respectively. LBM increased in SR by 2.1% 0.4% (p < .001), whereas it was unchanged in FR (-0.2% 0.7%), with significant differences between groups (p < .01). In conclusion, data from this study suggest that athletes who want to gain LBM and increase 1RM strength during a WL period combined with strength training should aim for a weekly BW loss of 0.7%.
http://brage.bibsys.no/nih/bitstream...bol%202011.pdf


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