Short-Term β-Hydroxy-β-Methylbutyrate Supplementation Does Not Reduce Symptoms of Eccentric Muscle Damage

in International Journal of Sport Nutrition and Exercise Metabolism
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Purpose:

We examined the effects of short-term β-hydroxy-β-methylbutyrate (HMB) supplementation on symptoms of muscle damage following an acute bout of eccentric exercise.

Methods:

Non-resistance trained subjects were randomly assigned to a HMB supplement group (HMB, 40mg/kg body weight/day, n = 8) or placebo group (CON, n = 9). Supplementation commenced 6 days prior to a bout of 24 maximal isokinetic eccentric contractions of the elbow flexors and continued throughout post-testing. Muscle soreness, upper arm girth, and torque measures were assessed pre-exercise, 15 min post-exercise, and 1,2,3, 4,7, and 10 days post-exercise.

Results:

No pre-test differences between HMB and CON groups were identified, and both performed a similar amount of eccentric work during the main eccentric exercise bout (p > .05). HMB supplementation had no effect on swelling, muscle soreness, or torque following the damaging eccentric exercise bout (p > .05).

Conclusion:

Compared to a placebo condition, short-term supplementation with 40mg/kg body weight/day of HMB had no beneficial effect on a range of symptoms associated with eccentric muscle damage. If HMB can produce an ergogenic response, a longer pre-exercise supplementation period may be necessary.

The authors <djpaddon@utmb.edu> are with the School of Human Movement Studies at The University of Queensland, Brisbane, Queensland, 4072, Australia.