Influence of Clothing on Thermoregulation and Comfort During Exercise in the Heat.
Sport textiles of synthetic fiber have been proposed to have superior properties for keeping wearers cooler, drier, and more comfortable compared to natural fibers. The impact of various fiber content and fabric construction on thermoregulation and perceptual responses are not well understood. Eight male collegiate athletes performed three counter-balanced trials of 45-min treadmill run at 60% of maximal oxygen uptake in an environmental chamber (32[degrees]C). Three different fibers, consisting of 100% cotton, a blend of natural fibers (50/50% cotton/soybean), and a synthetic fiber (100% polyester) with mesh loops to facilitate ventilation through the clothing, were tested. Heat strain indices, micro-environment temperature, ratings of perceived exertion (RPE), and clothing comfort were measured. Session RPE (S-RPE) and thermal sensation (S-TS) were recorded 20 min following each trial. There was no effect of clothing on rectal, skin, and body temperatures, heart rate, RPE, or comfort measures (p > 0.05). A significant effect was observed for synthetic fiber compared to cotton on S-RPE (p = 0.03), S-TS (p = 0.04), and the micro-environment temperature at the chest (p = 0.02). No significant difference was shown for any other fibers on S-RPE, S-TS, or other micro-environment areas (p > 0.05). These results show that clothing fiber content and fabric construction had no effect on thermoregulation, RPE, or clothing comfort during moderate intensity exercise in the heat; whereas, synthetic fabric construction indeed effectively reduced regional micro-environment temperature and attenuated global exertion and thermal sensation, which may have important implications for exercise tolerance in the heat.
Copyright (C) 2016 by the National Strength & Conditioning Association.
Autor / Fonte:Jon-Kyle Davis, C Matt Laurent, Kimberly E Allen, Yang Zhang, Nicola I Stolworthy, Taylor R Welch, Michael E Nevett Journal of Strength and Conditioning Research 2016 November 29