Abbreviated Journal Title
Br. J. Nutr.
beta-Hydroxy-beta-methylbutyrate free acid; Muscle damage; Recovery; Hormones; TAU-METHYLHISTIDINE 3-METHYLHISTIDINE; SKELETAL-MUSCLE; STRENGTH; HMB; RESPONSES; PERFORMANCE; HORMONES; MASS; SUPPLEMENTATION; REGENERATION; Nutrition & Dietetics
The purpose of the present study was to determine the effects of short-term supplementation with the free acid form of beta-hydroxy-beta-methylbutyrate (HMB-FA) on indices of muscle damage, protein breakdown, recovery and hormone status following a high-volume resistance training session in trained athletes. A total of twenty resistance-trained males were recruited to participate in a high-volume resistance training session centred on full squats, bench presses and dead lifts. Subjects were randomly assigned to receive either 3 g/d of HMB-FA or a placebo. Immediately before the exercise session and 48 h post-exercise, serum creatine kinase (CK), urinary 3-methylhistadine (3-MH), testosterone, cortisol and perceived recovery status (PRS) scale measurements were taken. The results showed that CK increased to a greater extent in the placebo (329%) than in the HMB-FA group (104%) (P=0.004, d=1.6). There was also a significant change for PRS, which decreased to a greater extent in the placebo (9.1 (SEM 0.4) to 4.6 (SEM 0.5)) than in the HMB-FA group (9.1 (SEM 0.3) to 6.3 (SEM 0.3)) (P=0.005, d = -0.48). Muscle protein breakdown, measured by 3-MH analysis, numerically decreased with HMB-FA supplementation and approached significance (P=0.08, d = 0.12). There were no acute changes in plasma total or free testosterone, cortisol or C-reactive protein. In conclusion, these results suggest that an HMB-FA supplement given to trained athletes before exercise can blunt increases in muscle damage and prevent declines in perceived readiness to train following a high-volume, muscle-damaging resistance-training session.
British Journal of Nutrition
Wilson, Jacob M.; Lowery, Ryan P.; Joy, Jordan M.; Walters, Joe A.; Baier, Shawn M.; Fuller, John C. Jr.; Stout, Jeffrey R.; Norton, Layne E.; Sikorski, Eric M.; Wilson, Stephanie M. C.; Duncan, Nevine M.; Zanchi, Nelo E.; and Rathmacher, John, "beta-Hydroxy-beta-methylbutyrate free acid reduces markers of exercise-induced muscle damage and improves recovery in resistance-trained men" (2013). Faculty Bibliography 2010s. 4856.