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Exercising in a Hot Environment: Which T-shirt to Wear?
Univ Wuppertal, Dept Sport Sci, D-42119 Wuppertal, Germany.
Univ Wuppertal, Dept Sport Sci, D-42119 Wuppertal, Germany.
Univ Wuppertal, Dept Sport Sci, D-42119 Wuppertal, Germany.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (NVC)ORCID iD: 0000-0002-3814-6246
2013 (English)In: Wilderness & environmental medicine (Print), ISSN 1080-6032, Vol. 24, no 3, 211-220 p.Article in journal (Refereed) Published
Abstract [en]

Objective. The aim of this study was to investigate thermoregulatory, cardiorespiratory, metabolic, and perceptual responses while running in a hot environment (31.7 degrees +/- 1.0 degrees C; 42% +/- 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 <= .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 <= .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.

Place, publisher, year, edition, pages
2013. Vol. 24, no 3, 211-220 p.
Keyword [en]
clothing fiber heat stress high intensity microenvironment thermoregulation
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-20660DOI: 10.1016/j.wem.2013.04.005ISI: 000324965200005Scopus ID: 2-s2.0-84884288565OAI: oai:DiVA.org:miun-20660DiVA: diva2:678636
Available from: 2013-12-12 Created: 2013-12-11 Last updated: 2013-12-12Bibliographically approved

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