Authors

J. M. Wilson; R. P. Lowery; J. M. Joy; J. A. Walters; S. M. Baier; J. C. Fuller; J. R. Stout; L. E. Norton; E. M. Sikorski; S. M. C. Wilson; N. M. Duncan; N. E. Zanchi;J. Rathmacher

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Abbreviated Journal Title

Br. J. Nutr.

Keywords

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

Abstract

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.

Journal Title

British Journal of Nutrition

Volume

110

Issue/Number

3

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

538

Last Page

544

WOS Identifier

WOS:000322276800018

ISSN

0007-1145

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