Effects of Hypohydration on Repeated 40 Yard Sprint Performance.
This study examined effects of hypohydration on repeated 40 yard sprint performance. Anaerobically fit current and former Division II male athletes (n = 12) completed 2 bouts of 10 x 40 yard sprints followed by an agility test (AT), dehydrated (~3% body weight(DT)), or euhydrated (HT). Statistical analysis of group means indicated that hypohydration had little effect on sprint times for either the first (DT: = 5.38 +/- 0.37; HT = 5.35 +/- 0.34) or second (DT = 5.47 +/- 0.39; HT = 5.42 +/- 0.39) bout of 10 sprints with only sprint number 2, 5, and 6 of bout 2 reaching statistical significance. However, when individual sprint performance was considered, a greater effect was seen. In all 83% (10 of 12) of subjects experienced a meaningful change (>= 0.1 s) (positive or negative) in mean sprint time (DT vs. HT) for one or more bout of 10 sprints. RPE was significantly higher (~ 1 unit on a 10 point scale) for DT in all sprints during bout 1 and the first 2 sprints of bout 2. These results indicate that the effect of hypohydration on repeated sprint performance varies among individuals. Some improved performance with hypohydration, while others experienced detrimental effects. Hypohydration also resulted in a particularly notable negative impact on perceptual measures of exertion even when performance was similar.
Copyright (C) 2015 by the National Strength & Conditioning Association.
Autor / Fonte:J J Gann, J M Green, E K O´Neal, L G Renfroe, T L Andre Journal of Strength and Conditioning Research 2015 September 1