- 作者：Billy Sperlich ; Dennis-Peter Born ; Marie Denise Lefter ; Hans-Christer Holmberg
- 关键词：clothing ; fiber ; heat stress ; high intensity ; microenvironment ; thermoregulation
- 刊名：Wilderness & Environmental Medicine
- 出版年：2013
- 出版时间：September, 2013
- 年：2013
- 卷：24
- 期：3
- 页码：211-220
- 全文大小：520 K
Objective
The aim of this study was to investigate thermoregulatory, cardiorespiratory, metabolic, and perceptual responses while running in a hot environment (31.7¡ã ¡À 1.0¡ãC; 42 % ¡À 3 % relative humidity) and wearing T-shirts made from different fiber types.Methods
Eight well-trained men performed 4 tests wearing either a T-shirt made of 100 % polyester with 4, 6, or 8 channels, or one made of 100 % cotton. Each test consisted of 30 minutes running at 70 % of peak oxygen uptake, followed by a ramp test to exhaustion and 15 minutes of recovery.
Results
There were no differences in skin, core, and body temperatures between fiber types during submaximal and high-intensity running (best P = .08). During recovery, body temperature and shivering/sweating sensations were lower when wearing 4- and 6-channel fibers (P ¡Ü .04) compared with cotton. The relative humidity at the chest and back were lower for all polyester T-shirts compared with cotton during and after submaximal and maximal running (P ¡Ü .007). Heart rate (best P = .10), oxygen uptake (P = .95), respiratory exchange ratio (best P = .93), ventilation (best P = .99), and blood lactate concentration (best P = .97) did not differ between the fiber types. Nor were any differences in time to exhaustion (best P = .76), ratings of perceived exertion (best P = .09), thermal sensation (best P = .07), or sensation of clothing wetness (best P = .36) discovered.
Conclusions
Although statistical analysis revealed lower shivering/sweating sensations while wearing 4- and 6-channel fiber shirts during recovery, with an improved chest and back microenvironment for all polyester T-shirts, the question remains whether these differences are of any practical relevance because the performance of the well-trained men was unaffected.