Reduction in body temperature using hand cooling versus passive rest after exercise in the heat

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
William M. Adams, Assistant Professor (Creator)
The University of North Carolina at Greensboro (UNCG )
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Abstract: Objectives: To examine the effects of hydration and hand cooling on lowering body temperature after exercise in the heat. Design: Randomized cross-over design. Methods: Nine recreationally active male participants (mean ± SD; age, 24 ± 4; height, 177.3 ± 9.9 cm; body mass, 76.7 ± 11.6 kg; body fat, 14.7 ± 5.8%) completed a bout of treadmill exercise in a hot environment. After completion of exercise, participants were assigned to the following trials for post-exercise cooling: (1) hydrated with passive rest (HY), (2) hydrated with hand cooling on both hands (HY + 2HC), (3) dehydrated with passive rest (DY), and (4) dehydrated with hand cooling on both hands (DY + 2HC). Within subject differences were assessed using a three-way (Hydration × Condition × Time) repeated measures ANOVA with Tukey's post hoc analysis if significant interactions were found. Results: Irrespective of hydration status, hand cooling on both hands resulted in significantly greater reductions in TREC than passive cooling at minute 20 (0.27°C [0.05, 0.49], ES = 2.08, p = 0.017) (Fig. 1). The reduction in TREC at minute 18 trended towards statistical significance (0.21°C [.003, .42], ES = 1.59, p = 0.053). Hydration status alone and when differentiated among modes of cooling showed no differences on changes of TREC or heart rate across all conditions during post exercise recovery (p > 0.05). Conclusions: Hand cooling on both hands reduced TREC more than passive cooling, however, the cooling rates observed render hand cooling a poor option for cooling. Greater reductions in TREC after exercise or between bouts of exercise may enhance recovery and subsequent performance.

Additional Information

Journal of Science and Medicine in Sport. 2016;19(11):936-940
Language: English
Date: 2016
Exertional heat illness, Thermal sensation, Exercise recovery, Rectal temperature, Hydration

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