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Dehydration and body fluid-regulating hormones during sweating in warm (38 degrees C) fresh- and seawater immersion


Dehydration and body fluid-regulating hormones during sweating in warm (38 degrees C) fresh- and seawater immersion



Journal of Applied Physiology 91(4): 1529-1534



ISSN/ISBN: 8750-7587

PMID: 11568133

Hope, Arvid, Leif Aanderud, and Asbjorn Aakvaag. Dehydration and body fluid-regulating hormones during sweating in warm (38[degree]C) fresh- and seawater immersion. J Appl Physiol 91: 1529-1534, 2001.--Body weight (BW) reductions of more than 4 kg have been observed during diving with the open hot water suit, a technique in which heated seawater (SW) continuously floods the skin surface. To test the hypothesis that osmotic effects may be involved in these fluid-loss processes, head-out immersion experiments in 38[degree]C freshwater (FW) and SW for 4 h were performed. Average BW reduction was 2.5 and 1.9 kg in SW and FW head-out immersion, respectively (P < 0.01). Atrial natriuretic peptide increased during the first 30 min of SW immersion (5.6-13.4 pmol/l, P < 0.01) followed by a reduction to 7.6 pmol/l (P < 0.01). This paralleled an initial decrease in aldosterone (from 427 to 306 pmol/l, P < 0.05) followed by an increase to 843 pmol/l (P < 0.01). The effects of temperature on fluid loss were studied in thermoneutral (34.5[degree]C) and 38[degree]C SW for 2 h. In thermoneutral SW, calculated sweat production was negligible (0.05 kg) compared with 1.2 kg in warm SW. We recommend that, if a dive is planned to last for more than 4 h, a mandatory break for fluid intake should be incorporated in the diving regulations. Reprinted by permission of the publisher.

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