Short-term heat acclimation is effective and may be enhanced rather than impaired by dehydration.

Unlabelled: Most heat acclimation data are from regimes longer than 1 week, and acclimation advice is to prevent dehydration.

Objectives: We hypothesized that (i) short-term (5-day) heat acclimation would substantially improve physiological strain and exercise tolerance under heat stress, and (ii) dehydration would provide a thermally independent stimulus for adaptation.

Methods: Nine aerobically fit males heat acclimated using controlled-hyperthermia (rectal temperature 38.

Induction and decay of short-term heat acclimation.

The purpose of this work was to investigate adaptation and decay from short-term (5-day) heat acclimation (STHA). Ten moderately trained males (mean +/- SD age 28 +/- 7 years; body mass 74.6 +/- 4.