Abstract
A mineral based supplement purported to contain silica hydride (SH) has been suggested to bind reduced hydrogen ions which may serve to buffer hydrogen ion concentrations during aerobic exercise. PURPOSE: The purpose of this study was to examine the effects of seven days of SH supplementation on physical and cognitive markers of aerobic exercise performance. METHODS: Male participants (N = 15, 23.1 ± 0.8 yrs, 180.0 ± 2.1 cm, 83.4 ± 2.8 kg, 16.4 ± 1.3%) were tested on three occasions using identical testing procedures under a control (CON), rice flour placebo (PLA) and SH. PLA and SH supplementation consisted of seven-day periods in which participants consumed 4 × 250 mg capsules/day. Following the 7-day supplementation period participants arrived at the laboratory in a fasted state and completed a VO2 peak test on a cycle ergometer. Blood lactate levels and ratings of perceived exertion (RPE) were assessed immediately pre-exercise, at 1.5 minute intervals starting 5 minutes following the initiation of exercise, and 5 minutes post-exercise. Separate one-way ANOVAs were performed for the assessment of time to exhaustion (TTE), time to ventilatory threshold (VT), time to respiratory quotient (RQ) of 1.0, VO2 peak, peak power (PP), power at VT, heart rate at PP, TTE after VT and TTE after reaching a RQ of 1.0. Separate 3 × 8 RM ANOVAs with Tukey post hoc comparisons were used to examine blood lactate and RPE responses during testing. For each statistic a p-value of < 0.05 was used to determine significance. RESULTS: A significant time effect was found for RPE and blood lactate, as the exercise protocol became more difficult and resulted in a significant increase in blood lactate over time. No significant differences between conditions were found for any of the examined performance variables. CONCLUSIONS: SH supplementation had no buffering effect on blood lactate concentrations and presented no performance enhancing benefits. As a result, future research should examine if increasing the dosage and/or supplementation period affects blood lactate and or performance outcomes.
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