Effects of heat exposure and 3% dehydration achieved via hot water immersion on repeated cycle sprint performance

Justin A. Kraft, James M. Green, Phillip A. Bishop, Mark T. Richardson, Yasmin H. Neggers, James D. Leeper

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

This study examined effects of heat exposure with and without dehydration on repeated anaerobic cycling. Males (n = 10) completed 3 trials: control (CT), water-bath heat exposure (∼39°C) to 3% dehydration (with fluid replacement) (HE), and similar heat exposure to 3% dehydration (DEHY). Hematocrit increased significantly from pre to postheat immersion in both HE and DEHY. Participants performed 6 × 15s cycle sprints (30s active recovery). Mean Power (MP) was significantly lower vs. CT (596 ± 66 W) for DEHY (569 ± 72 W), and the difference approached significance for HE (582 ± 76 W, p = 0.07). Peak Power (PP) was significantly lower vs. CT (900 ± 117 W) for HE (870 ± 128 W) and approached significance for DEHY (857 ± 145 W, p = 0.07). Postsprint ratings of perceived exertion was higher during DEHY (6.4 ± 2.0) and HE (6.3 ± 1.6) than CT (5.7 ± 2.1). Combined heat and dehydration impaired MP and PP (decrements greatest in later bouts) with HE performance intermediate to CT and DEHY.

Original languageEnglish
Pages (from-to)778-786
Number of pages9
JournalJournal of Strength and Conditioning Research
Volume25
Issue number3
DOIs
StatePublished - Mar 2011

Keywords

  • Anaerobic performance
  • Dehydration
  • Hypohydration
  • Weight loss

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