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

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.

journal_name

J Strength Cond Res

authors

Kraft JA,Green JM,Bishop PA,Richardson MT,Neggers YH,Leeper JD

doi

10.1519/JSC.0b013e3181c1f79d

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

778-86

issue

3

eissn

1064-8011

issn

1533-4287

journal_volume

25

pub_type

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