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Current hydration guidelines are erroneous: dehydration does not impair exercise performance in the heat.

Bradley A Wall¹, Greig Watson², Jeremiah J Peiffer³

¹School of Exercise Biomedical and Health Science, Edith Cowan University, Joondalup, Western Australia, Australia School of Chiropractic and Sports Science, Murdoch University, Murdoch, Western Australia, Australia.

British Journal of Sports Medicine

|September 24, 2013

Summary

Dehydration to -3% body mass did not affect cycling performance in heat with wind, challenging current hydration guidelines. Performance and physiological measures remained similar across hydration states when cyclists were blinded.

Keywords:

Cycling Dehydration Endurance Fluid Balance Thermoregulation

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Area of Science:

Exercise Physiology
Sports Science
Environmental Physiology

Background:

Laboratory studies suggest dehydration (-2% body mass) impairs exercise performance, increasing body temperature and heart rate.
Previous research often lacked ecologically valid conditions like wind speed and participant blinding to hydration status.

Purpose of the Study:

To examine the impact of blinded hydration status on cycling time-trial performance.
To investigate performance in heat under realistic wind conditions (32 km/h).

Main Methods:

Ten cyclists completed three trials, dehydrated to -3% body mass, then reinfused to achieve 0%, -2%, or -3% hypohydration.
Participants performed a 25 km time trial in 33°C heat, with hydration status maintained via saline infusion.
Performance, physiological (heart rate, temperature), and perceptual data were collected.

Main Results:

Rectal temperature was significantly higher in the -3% hypohydration condition compared to 0% hypohydration after 17 km (38.9°C vs 38.6°C).
No significant differences were observed in cycling time-trial completion time, power output, or other physiological and perceptual variables.

Conclusions:

Blinded hydration status and ecologically valid conditions did not alter cycling performance or key physiological responses.
Current hydration guidelines may need re-evaluation, as performance was not detrimentally affected by moderate dehydration under these specific conditions.