Nordic skiers (M = 8; F = 6) performed two discontinuous treadmill bouts to exhaustion in a 22 degrees Celsius environment under conditions of euhydration (normal hydrated state) and hypohydration (-4% body mass). There were no differences between the genders in either condition for any of the variables measured. There were no differences in lactate threshold, oxygen uptake, or ratings of perceived exertion between conditions. Implication. Mild hypohydration does not appear to affect physiological responses in comfortable exercise environments.
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