Leucine Metabolites Do Not Induce Changes In Phase Angle, Bioimpedance Vector Analysis Patterns, And Strength In Resistance Trained Men
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM(2021)
摘要
We aimed to assess the effects of off-the-shelf leucine metabolite supplements on phase angle (PhA), bioimpedance vector analysis (BIVA) patterns and strength during an 8-week resistance training protocol. Fifty-three male participants were allocated into 4 groups: alpha-hydroxyisocaproic acid (n =12, age = 30.9 +/- 9.3 years), beta-hydroxy-beta-methylbutyrate free acid (n =12, age = 31.0 +/- 9.3 years), calcium beta-hydroxy-beta-methylbutyrate (n =15, age = 32.1 +/- 5.2 years) or placebo (n =14, age = 28.9 +/- 6.6 years). Bioimpedance parameters and 1-repetition maximum (IRM) for back squat and bench press were assessed at baseline and at the end of weeks 4 and 8. Additionally, fat-free mass and fat mass were evaluated by dual-energy X-ray absorptiometry. No statistically group by time interactions were found, even adjusting for age. PhA and vector did not change over the training period, while time-dependent increases were observed for 1RM back squat and 1RM bench press. A direct association was observed between PhA and 1RM bench press changes (whole sample), while PhA and strength were correlated throughout the study, even when adjusting for fat-free mass and percentage of fat mass. Leucine metabolites have no effect on PhA, BIVA patterns or strength during an 8-week resistance training program, in resistance trained subjects.Novelty:Supplementation with leucine metabolites is not a supplementation strategy that improves bioelectrical phase angle, cellular health, and strength after an 8-week resistance training program.When constuning a high protein diet, none of the alpha-hydroxyisocaproic acid, beta-hydroxy-beta-methylbutyrate free acid, and calcium beta-hydroxy-beta-methylbutyrate metabolites resulted in an ergogenic effect in resistance trained men.
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关键词
BIVA, body composition, resistance training, R-Xc graph
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