Abstract
Background Athletes exposed to extreme training loads such as those that occur during multiple-game tournaments, two a day practices, or sudden increases in volume are prone to overreaching. Beta-hydoxy-beta-methylbutyrate (HMB) is thought to increase regenerative capacity following high intensity exercise. However, to date, its effects on muscle damage, hormonal status, and performance during overreaching have yet to be investigated. Therefore the purpose of this investigation was to determine the effects of HMB free acid (HMB-FA) supplementation on indices of muscle damage, strength, power, and cortisol following a 2-week overreaching cycle.
Highlights
Athletes exposed to extreme training loads such as those that occur during multiple-game tournaments, two a day practices, or sudden increases in volume are prone to overreaching
Significant group X time effects were found for creatine kinase (CK), which relative to baseline values (256.1 ± 28.3 U/L) increased at weeks 1 (493.8 ± 36.3 U/L) and 2 (533.4 ± 49.0 U/L) in the placebo group, but not the HMB group (p
There were group X time effects for strength of the squat, bench press, and deadlift, which decreased during weeks 1 and 2 in the placebo group, but not the HMB group (p
Summary
Athletes exposed to extreme training loads such as those that occur during multiple-game tournaments, two a day practices, or sudden increases in volume are prone to overreaching. Beta-hydoxy-beta-methylbutyrate (HMB) is thought to increase regenerative capacity following high intensity exercise. To date, its effects on muscle damage, hormonal status, and performance during overreaching have yet to be investigated. The purpose of this investigation was to determine the effects of HMB free acid (HMB-FA) supplementation on indices of muscle damage, strength, power, and cortisol following a 2-week overreaching cycle
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