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Int J Sports Med 2017; 38(02): 141-149
DOI: 10.1055/s-0042-119030
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Beneficial Effects of Cooling during Constant Power Non-steady State Cycling

Eric P. Homestead
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, United States
,
Benjamin J. Ryan
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, United States
,
Jesse A. Goodrich
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, United States
,
William C. Byrnes
1   Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, United States
› Author Affiliations
Further Information

Publication History



accepted after revision 05 October 2016

Publication Date:
16 December 2016 (online)

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Abstract

This study compared the effects of cooling on the energetic and associated physiological and perceptual responses to constant power, non-steady state cycling. Twelve males cycled at their lactate threshold power for 60 min or until exhaustion under 3 conditions: wearing a cooling vest and sleeves (COOL), a synthetic shirt embedded with an active particle technology claimed to facilitate evaporative heat loss (EVAP), and a standard synthetic shirt (CON). When adjusted for time, the increase in gastrointestinal temperature from baseline was reduced during COOL and EVAP compared to CON (1.44±0.45 and 1.52±0.43 vs. 1.66±0.45°C, p<0.05). Sweat rate was reduced during COOL compared to EVAP and CON (1 312±331 vs. 1 525±393 and 1 550±548 mL·h−1, p<0.01). Gross efficiency decreased over time across conditions (p<0.01), but COOL attenuated this decrease by 22% compared to CON (p<0.05). The rating of perceived exertion was reduced during COOL and EVAP compared to CON (p<0.01). In conclusion, cooling using a vest and sleeves or wearing an active particle technology shirt reduced the rise in gastrointestinal temperature and rating of perceived exertion compared to a standard synthetic shirt. Cooling using a vest and sleeves also reduced the decrease in gross efficiency and sweat rate compared to wearing the standard synthetic shirt.

Key words

thermoregulation - core temperature - oxygen consumption
 

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