Leucine metabolites, α-hydroxyisocaproic acid (α-HICA) and β-hydroxy-β-methylbutyrate (calcium, HMB-Ca and free acid, HMB-FA), have been proposed to augment resistance training-induced changes in body composition and performance.
We aimed to conduct a double-blind randomized controlled pragmatic trial to evaluate the effects of off-the-shelf leucine metabolite supplements of α-HICA, HMB-FA, and HMB-Ca on resistance training-induced changes in muscle thickness and performance.
Forty men were randomly assigned to receive α-HICA (
n= 10, fat-free mass [FFM] = 62.0 ± 7.1 kg), HMB-FA ( n= 11, FFM = 62.7 ± 10.5 kg), HMB-Ca ( n= 9, FFM = 65.6 ± 10.1 kg), or placebo (PLA; n= 10, FFM = 64.2 ± 5.7 kg). The training program consisted of whole body thrice weekly resistance training for 8 wk (seven exercises per session, three to four sets per session, at 70%–80% one repetition maximum). Skeletal muscle thickness by ultrasound, performance measures, and blood measures (creatine kinase, insulin-like growth factor 1, growth hormone, cortisol, and total testosterone) were evaluated at baseline and at the end of weeks 4 and 8. Results
Time-dependent changes were observed for muscle thickness (
P< 0.001), one repetition maximum bench press and squat ( P< 0.001), Wingate peak power ( P= 0.02), countermovement jump height ( P= 0.03), power ( P= 0.006), creatine kinase, insulin-like growth factor-1, growth hormone, and cortisol (all P< 0.001). No significant between-group or time–group interactions were observed. Conclusions
No leucine metabolite resulted in any ergogenic effects on any outcome variable. Supplementation with leucine metabolites—α-HICA, HMB-FA, or HMB-Ca—is not a supplementation strategy that improves muscle growth and strength development in young adult men.