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Two percent hypohydration does not impair self-selected high-intensity intermittent exercise performance.

Naoyuki Yamashita1, Ryo Ito, Masataka Nakano

  • 11Laboratory for Exercise Physiology and Biomechanics, Graduate School of Health and Sport Sciences, Chukyo University, Toyota, Japan; 2University Educational Center, Nihon Fukushi University, Mihama-Cho, Japan; and 3Department of Human Health, Faculty of Human Studies, Aichi Toho University, Nagoya, Japan.

Journal of Strength and Conditioning Research
|December 24, 2014
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Mild dehydration (2% body mass loss) did not impact intermittent exercise performance in boxers. Power output remained stable, suggesting this level of hypohydration is below the performance-decrement threshold.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The precise level of hypohydration impacting intermittent exercise power output is not well-defined.
  • Understanding dehydration's effects is crucial for athletic performance optimization.

Purpose of the Study:

  • To investigate the impact of 2% hypohydration, without accompanying hyperthermia, on intermittent exercise performance.
  • To determine if a 2% body mass loss threshold affects power output in collegiate boxers.

Main Methods:

  • Eight collegiate boxers participated in two randomized trials: one with 2% hypohydration (HYP) and one euhydrated (EUH).
  • Intermittent exercise involved four 2-minute rounds of maximal cycling efforts with 1-minute recovery.
  • Measurements included mean power output per kilogram (MPO), total power output per kilogram (TPO), energy system contributions, and core rectal temperature (Tre).

Main Results:

  • Body mass changes were significant (-2.25% HYP vs. -0.17% EUH).
  • No significant differences were observed in MPO, TPO, or energy system contributions between HYP and EUH trials.
  • Core rectal temperature (Tre) remained consistent between the two conditions.

Conclusions:

  • Approximately 2% hypohydration does not significantly impair power output during intermittent exercise in collegiate boxers.
  • The threshold for reduced power output during this type of exercise likely occurs at a greater level of dehydration.
  • These findings suggest that mild dehydration may not be a primary limiting factor for short-duration, high-intensity intermittent exercise performance.