[abstract] THERMAL HOMEOSTASIS OF MEN IN HELIUM OXYGEN AT 50 ATMOSPHERES ABSOLUTE.

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[abstract] THERMAL HOMEOSTASIS OF MEN IN HELIUM OXYGEN AT 50 ATMOSPHERES ABSOLUTE.

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Title: [abstract] THERMAL HOMEOSTASIS OF MEN IN HELIUM OXYGEN AT 50 ATMOSPHERES ABSOLUTE.
Author: Raymond, LW; Lindgren, G; Thalmann, ED; Crothers, JC; Spaur, WH; Braithwaite, WR; Langworthy, HC; Berghage, TE
Abstract: Spaur et al. showed last year that man can work effectively and live comfortably for periods of at least 7 days in helium-oxygen at 49.5 atm. abs. (ATA). This pressure is equivalent to 1600 ft (488 m) sea water. Two of six men were studied during compression, habitation and decompression from 49.5 ATA in hyperbaric chambers with a PO2 of 0.30-0.35 ATA, over 32 days. To avoid thermal discomforty ambient temperature was maintained at 30-32 C (86-89.6 F) relative humidity was 68-742, and there was no measurable atmospheric velocity (V greater than 10 m/min or 33 ft/min). Comfort and thermal balance were adequate during mild activity when the men wore swim trunks and cotton jersey shirts. When they were seated without shirts, rectal temperature fell during 2-hr observation periods at depths below 800 ft, while skin temperature and oxygen consumption remained normal, and scrotal temperature was increased. The fall in rectal temperature during rest appears to be due more to skin convection than to respiratory heat losses, and the coefficient of cutaneous convection could be expressed in the form of Varenels equationy in hc = 1.09 P(expon)0.78 which hc is in watts/m(expon)2 C, and P is pressure in ATA. Individual differences in hc and in core-to-skin heat conductance appeared to be related to body type. The weight loss seen in all 6 subjects (Clin. Res. 21, 4/74) appeared to be due more to fluid shifts than to caloric deficiencies since the divers regained weight during the latter days of the dive while consuming fewer calories (2200 kcal/day) than they had during the period of weight loss, at similar levels of activity.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 10-11, 1974. Hilton Hotel, Washington, D.C. (http:www.uhms.org)
URI: http://archive.rubicon-foundation.org/32
Date: 1974

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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