Industrial Health
Online ISSN : 1880-8026
Print ISSN : 0019-8366
ISSN-L : 0019-8366
Hand and forearm cooling: exploring deep-body cooling in hyperthermic individuals following exercise-induced heating at three different work rates
Seon-Hong SEOLGyu-Tae BAENigel A.S. TAYLORJoo-Young LEE
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JOURNALS FREE ACCESS Advance online publication

Article ID: 2020-0232

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Abstract

The purpose of this study was to evaluate upper-limb cooling following (treadmill) exercise performed in the heat (33℃, 70% relative humidity) at each of three speeds: light (6 km.h–1), intermediate (8 km.h–1) and moderate intensity (10 km.h–1). In all trials, exercise ceased when rectal temperature reached 39.0℃. Participants adopted a sitting position for a 20-min recovery, and liquid-cooling sleeves with cold water (6.3℃ were immediately positioned. The chosen work rates resulted in a two-fold difference in exercise duration across those trials, which terminated without significant between-trial differences within either auditory canal or rectal temperatures. Auditory canal temperature elevation rates became progressively faster as the work rate increased: 0.03℃.min–1 (light), 0.05℃.min–1 (intermediate) and 0.07℃.min–1 (moderate) (p<0.05). However, heat extraction during recovery did not differ among those treatments: –11.2 W (SE 0.5; light), –11.8 W (0.6; intermediate) and –12.3 W (0.5; moderate; p>0.05). That outcome was reflected in auditory canal cooling rates (0.03℃.min–1 [light], 0.04℃.min–1 [intermediate] and 0.05℃.min–1 [moderate]). Nevertheless, rectal temperatures continued to rise throughout recovery. It is concluded that heat extraction from moderately hyperthermic individuals, using upper-limb cooling sleeves, appears to be equally rapid, regardless of heating speed, providing the same level of hyperthermia was attained prior to initiating treatment.

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© 2021 by National Institute of Occupational Safety and Health
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