Effect of pressure on thermal insulation in humans wearing wet suits

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Bibliographic Details
Title translated into German:Auswirkungen von Druck auf die Waermeisolierung bei Tauchern in Kaelteschutzanzuegen
Author:Park, Y.H.; Iwamoto, J.; Tajima, F.; Miki, K.; Park, Y.S.; Shiraki, K.
Published in:Journal of applied physiology
Published:64 (1988), 5 , S. 1916-1922, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
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Identification number:PU198807012694


The present work was undertaken to determine the critical water temperature (Tew), defined as the lowest water temperature a subject can tolerate at rest for 3 h without shivering, of wet-suited subjects during water immersion at different ambient pressures. Nine healthy males wearing neoprene wet suits (5 mm thick) were subjected to immersion to the neck in water at 1,2, and 2,5 ATA while resting for 3 h. Continuous measurements of esophageal (Tes) and skin (Tsk) temperatures and heat loss from the skin (Htissue) and wet suits (Hsuit) were recorded. Insulation of the tissue (Itissue), wet suits (Isuit), and overall total (Itotal) were calculated from the temperature gradaient and the heat loss. The Tew increased curvilinearly as the pressure increased, whereas the metabolic heat production during rest and immersion was identical over the range of pressure tested. During the 3rd h of immersion, Tes was identical under all atmospheric pressures; however, Tsk was significantly higher at 2 and 2.5 ATA compared with 1 ATA. A 42 and 50, reduction in Isuit from the 1 ATA value was detected at 2 and 2.5 ATA, respectively. However, overall mean Itissue was maximal and independent of the pressure during immersion at Tew. The Itotal was also significantly smaller in 2 and 2.5 ATA compared with 1 ATA. The Itissue provided most insulation in the extremities, such as the hand and foot, and the contribution of Isuit in these body parts was relatively small. On the other hand, Itissue of the trunk areas, such as the chest, back, and thigh, was not high compared with the extemities, and Isuit played a major role in the protection of heat drain from these body parts. Verf.-Referat