International Society of Sports Nutrition Position Stand: beta-hydroxy-beta-methylbutyrate (HMB).
Level 5 - mechanism / opinion, no new human data
Expert consensus position stand and narrative literature review
PubMed 23374455 · doi:10.1186/1550-2783-10-6
What was done
The International Society of Sports Nutrition (ISSN) conducted a critical analysis of published literature to establish an official position stand regarding the efficacy, dosage, timing, safety, and mechanisms of beta-hydroxy-beta-methylbutyrate (HMB) supplementation in athletic and elderly populations.
What was found
The abstract summarizes 9 qualitative consensus points without reporting quantitative effect sizes or statistics: 1. HMB attenuates exercise-induced muscle damage and enhances recovery in trained and untrained individuals. 2. Supplementation benefits athletes when consumed close to workout sessions. 3. Optimal efficacy appears with consumption starting 2 weeks prior to an exercise bout. 4. A daily intake of 38 mg/kg body mass enhances muscle hypertrophy, strength, and power when paired with proper exercise prescription. 5. HMB free acid (HMB-FA) may have superior absorption and retention compared to calcium HMB (HMB-Ca), but comparative evidence is preliminary. 6. HMB increases lean body mass and functional capacity in sedentary elderly populations. 7. HMB combined with structured exercise may promote fat mass reduction. 8. Primary mechanisms involve decreasing proteolysis and increasing protein synthesis. 9. Chronic intake is safe in young and older cohorts.
Why it matters
It establishes evidence-based clinical and athletic guidance from a major sports nutrition body, setting a standard recommended dose (38 mg/kg/day) and administration strategy for HMB.
Limits
The paper is a narrative position stand rather than a systematic review or meta-analysis; no inclusion criteria, study count (n), or risk of bias assessments are provided in the abstract. Quantitative data and confidence intervals are completely omitted from the abstract. Comparative superiority between HMB formulations remains unestablished.
Cited by
- supports Calcium beta-hydroxy-beta-methylbutyrate (HMB) supplementation supports muscle recovery and attenuates muscle protein breakdown.