Molecular Hydrogen Supplementation and Multiple Sprint Running Performance; a Pilot Investigation.

Abstract

Recently it has been suggested that molecular hydrogen could attenuate performance decrement during high intensity, short duration interval exercise. Antioxidant properties of molecular hydrogen indicate that it might be beneficial for reducing oxidative stress induced muscle performance decrements. PURPOSE:To examine the effects of molecular hydrogen supplementation on multiple sprint running performance. METHODS:Using a randomized, double-blind, crossover design, 15 physically active men ingested either molecular hydrogen-rich water (400 mg of molecular hydrogen) or a placebo, prior completing an indoor multiple sprint running (12 X 30 m; departing at 35-s intervals). Mean sprint time, fastest time, and fatigue index were recorded via twin-beam photocells, and earlobe blood samples were drawn to evaluate pretest and post-test lactate concentrations. Heart rate was monitored continuously throughout the tests, with RPE recorded after every second sprint. RESULTS:Relative to placebo, molecular hydrogen resulted in a 0.08-s (2%) reduction in mean sprint time (p < 0.05, 95% likely range = 0.04-0.09s) as well as 0.04-s (1%) reduction in fastest time (p < 0.01, 95% likely range = 0.05-0.06s), which corresponded in a 1% improvement in fatigue (p <0.05, 95% likely range = 0.8-1.1%). Molecular hydrogen supplementation also resulted in a 1-bpm increase in mean heart rate (169 ±17 versus 170 ±17; p < 0.01, 95% likely range = 0.3-3.5bpm). There was an increase in blood lactate over the course of each sprint trial (p < 0.01) which was greater in molecular hydrogen group (p < 0.05; 0.6 mMol· -1; 95% likely range = 0.1-1.7 mMol· -1). Rating of perceived exertion (RPE) showed a significant group effect (p < 0.01, 95% likely range = 0.9-1.6). CONCLUSIONS:Results of this pilot study indicate some ergogenic potential of molecular hydrogen supplementation on multiple sprint running performance. Further studies are needed in order to determine the dose response and the potential mechanisms of action for this intervention.