Pre-season is characterized by high training volumes with short recovery periods β-hydroxy β-methylbutyrate (HMB) has been postulated to assist with recovery. HMB has been shown to improve strength and body composition amongst untrained groups the benefits of HMB amongst trained populations are unclear due to the methodologies employed. This randomized control trail determined the effects of 11 weeks HMB supplementation on body mass and performance measures in 27 elite rugby players. HMB group (n=13) mean±SD age 20.3±1.2 years, body mass 99.6±9.1 kg; placebo group (n=14), age 21.9±2.8 years body mass 99.4±13.9 kg for placebo. During the supplementation period body mass increased with HMB 0.57±2.60 kg but decreased with placebo 1.39±2.02 kg (p=0.029). There were no significant differences in any of the four strength variables (p>0.05). However, on the YoYo IR-1 the placebo group improved 4.0±2.8 levels but HMB decreased 2.0±3.0 levels (p=0.003). The results of this study suggest HMB could be beneficial for gaining or maintaining body mass during periods of increased training load. However, it appears that HMB may be detrimental to intermittent running ability in this group, although further research is required before firm conclusions can be made. Only 6 participants on HMB managed to complete both YoYo IR-1 tests due to injury, a larger sample size is required to fully investigate this potentially negative effect. Further, the mechanisms behind this decrement in performance cannot be fully explained and requires further biochemical and psychological investigation.
This research output has an Altmetric Attention Score of 14. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 19 June 2019.
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Outputs of similar age from Journal of Strength & Conditioning Research
#24
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Altmetric has tracked 34,365,356 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 90th percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
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