Changes in insulation of body tissue and wet suits during underwater exercise at various atmospheric pressures

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Deutscher übersetzter Titel:Aenderungen der Isolierung von Koerpergewebe und Wetsuits bei koerperlicher Betaetigung unter Wasser unter verschiedenen atmosphaerischen Druecken
Autor:Iwamoto, Jun; Sagawa, Sueko; Tajima, Fumihiro; Miki, Kenju; Tanaka, Hiromichi; Shiraki, Keizo
Erschienen in:Journal of applied physiology
Veröffentlicht:68 (1990), 2, S. 659-664, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource
Sprache:Englisch
ISSN:8750-7587, 0021-8987, 0161-7567, 1522-1601
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Erfassungsnummer:PU199202043199
Quelle:BISp

Abstract

To clarify the independent changes of insulations of body tissues (Itissue) and wet suit (Isuit) in the wet-suited subject during underwater exercise, overall heat flow from the skin (Htissue) and wet suit (Hsuit) and esophageal (Tes), skin (Tsk), and wet suit temperatures were measured at 1, 2, and 2.5 atmospheres absolute (ATA) at critical water temperature (Tcw). The average Tcw in nine wet-suited men (23-38 yr) was 22.3 +/- 0.2, 26.3 +/- 0.2, and 28.0 +/- 0.4 deg C (SE) at 1, 2, and 2.5 ATA, respectively. At Tcw of each pressure male volunteers wearing 5-mm neoprene wet suits completed three 2-h experiments while immersed up to the neck. During one experiment the subjects remained at rest, and in the other two they exercised on an underwater ergometer at two different intensities (2 and 3 met). Tes significantly declined over 2 h from 37.1 to 36.5 deg C during rest in each pressure. The 2-met exercise prevented Tes from falling in all pressures, and the 3-met exercise elevated Tes by 0.2-0.3 deg C. There was no exercise-dependent difference in Isuit, but a pressure-dependent difference was remarkable. The Itissue at rest was identical for all pressures; however, it progressively decreased as a function of exercise intensity. It is concluded that overall Itissue is entirely determined by work intensity at Tcw, but not by atmospheric pressure. On the contrary, Isuit at Tcw is solely dependent on the pressure, but not on the work intensity. Verf.-Referat