Mild dehydration following voluntary water intake reduction does not affect anaerobic power performance

BACKGROUND: Dehydration is common among athletes. The negative impact of dehydration on aerobic performance is well characterized. However, little is known about the effect of dehydration on anaerobic performance particularly when dehydration results from insufficient water intake, not water loss due to body temperature regulation. The purpose of this study was to examine the effect of dehydration on anaerobic performance following voluntary water intake reduction. METHODS: Fifteen healthy adults completed two exercise sessions, euhydrated (EUD) and dehydrated (DEH). Sessions consisted of baseline anthropometric and blood lactate measurement followed by a 30-second Wingate test and three vertical jump trials to measure anaerobic performance. Additional blood lactate measurements were taken immediately and at 5, 10, and 15 minutes after taking the Wingate test. RESULTS: The dehydration protocol resulted in a reduction in body mass (EUD69.1±17.2 kg, DEH68.1±16.6 kg, P=0.039). The 30-s Wingate peak power (EUD971±302 W, DEH960±316 W, P=0.578) was not different between conditions, nor was the vertical jump height (EUH26.4±4.5 cm, DEH26.6±3.6 cm, P=0.778). Blood lactate (P<0.001) was elevated immediately following the 30-s Wingate test which remained throughout the trial. There were no differences in blood lactate between conditions. CONCLUSIONS: Acute anaerobic power and exercise performance is not negatively affected by voluntary dehydration.