1-8 Heat Loss and Insulation Changes by Wearing a Thermal Swimsuit during Water Immersion

The purpose of this study was to clarify the heat loss and insulation changes by wearing thermal swimsuit (TS) during 60 min water immersion. Ten healthy male subjects wearing either TS or normal swimsuit (SS) immersed in water (26℃ or 29℃). Esophagus temperature (Tes), skin temperatures and expired...

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Bibliographic Details
Published inJournal of PHYSIOLOGICAL ANTHROPOLOGY and Applied Human Science Vol. 23; no. 2; p. 60
Main Authors Hitoshi WAKABAYASHI, Atsuko SUGANO, Takeo NOMURA
Format Journal Article
LanguageJapanese
Published Japan Society of Physiological Anthropology 2004
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Summary:The purpose of this study was to clarify the heat loss and insulation changes by wearing thermal swimsuit (TS) during 60 min water immersion. Ten healthy male subjects wearing either TS or normal swimsuit (SS) immersed in water (26℃ or 29℃). Esophagus temperature (Tes), skin temperatures and expired gas were measured during experiments. Metabolic heat production (M) was calculated from expired gas. Total heat loss (Hs) was calculated from M and the change in mean body temperature during water immersion. Total insulation (Itotal) and tissue insulation (Itissue) were derived from Tes-Tw or -Tsk gradient and Hs [Itotal=(Tes-Tw)/Hs; Itissue=(Tes-Tsk)/Hs]. Hs was smaller in TS condition at both Tw (p<0.05). Itotal was higher in TS condition (p<0.05) following additional insulating layer. Itissue was smaller in TS condition at 29℃. Wearing TS increased Itotal and reduced Hs from the skin. Therefore fall of body temperature and increase of metabolism were modified. It was suggested that TS has the effect of modifying cold stimulus during water immersion.
ISSN:1345-3475