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Effect of exercise-induced dehydration on time-trial exercise performance: a meta-analysis
  1. Eric D B Goulet1,2
  1. 1Research Centre on Aging, University of Sherbrooke, Sherbrooke, Québec, Canada
  2. 2Faculty of Physical Education and Sports, University of Sherbrooke, Sherbrooke, Québec, Canada
  1. Correspondence to Dr Eric D B Goulet, Research Centre on Aging/Faculty of Physical Education and Sports, University of Sherbrooke, 1036 Belvédère Sud, Sherbrooke, Québec, Canada, J1H 4C4; eric.goulet{at}


Objective To use the meta-analytical procedures to determine the magnitude of the effect of exercise-induced dehydration (EID) upon time-trial (TT) exercise performance.

Methods Studies were located via database searches and cross-referencing. TT performance outcomes were converted to mean percentage changes in power output. Random-effects model meta-regressions, analogue to the ANOVA and weighted mean effect summaries were used to delineate the effect of the EID-associated body weight (BW) loss on TT performance.

Conclusions (1) Compared with euhydration, EID (up to 4% BW loss) does not alter cycling performances during out-of-door exercise conditions; (2) exercise intensity and duration have a much greater impact on cycling TT performances than EID and; (3) relying on thirst sensation to gauge the need for fluid replacement maximises cycling TT performances.

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  • Competing interests The author reports no conflict of interest with any organisations.

  • Provenance and peer review Not commissioned; externally peer reviewed.