[abstract] WEIGHT, PLASMA VOLUME, AND ELECTROLYTE CHANGES DURING PROLONGED IMMERSION.

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[abstract] WEIGHT, PLASMA VOLUME, AND ELECTROLYTE CHANGES DURING PROLONGED IMMERSION.

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Title: [abstract] WEIGHT, PLASMA VOLUME, AND ELECTROLYTE CHANGES DURING PROLONGED IMMERSION.
Author: Kelleher, PC; Anthony, TG; Gilbert, MJ
Abstract: BACKGROUND: It is known that immersion is associated with diuresis and decreases in plasma volume. Limited information is available describing body weight, plasma volume, and serum electrolyte changes during whole-body immersions exceeding 6 hours duration in cold water. In the present study these factors were measured during immersions of up to 9 hours in thermally protected subjects in cold water. METHODS: Four subjects each completed two resting upright whole-body immersions at a depth of 3 meters in 2° C water wearing a drysuit, synthetic pile undergarment, and electrically heated gloves. The subjects remained immersed for up to 9 hours or until ethical abort criteria were reached. Air was provided by a full face mask breathing apparatus. The divers were prehydrated with a volume of water equal to 0.5% of their body weight + 350 ml. prior to immersion. RESULTS: Values are expressed as mean ± S.E. The mean duration of immersion was 425 ± 41 minutes with 6 of the immersions exceeding 360 minutes. Mean temperatures averaged over the minute prior to termination of the immersion were: rectal, 37.0 ± 0.2°C; mean weighted skin (4 sites), 32.4 ± 0.3°C; finger, 15.5 ± 0.9°C; toe, 11.9 ± 0.9°C. Immersion was associated with a decrease in body weight of 2.8 ± 0.2 kg, representing a mean weight loss of 3.4% ± 0.3. The mean post-immersion hemoglobin (16.3 ± 0.3 g/dll was significantly greater than the mean pre-immersion value (15.1 ± 0.2 g/dl) (P<O.Ol ANOVAI. The mean post-immersion hematocrit (48.9 ± 1.21 was significantly greater than the mean pre-immersion hematocrit (45.1 ± 0.61 (P<0.0l ANOVA). Plasma volume (calculated from hemoglobin and hematocrit) decreased 16.1 % ± 3.4. There were no significant differences between pre-and post-immersion serum Na, K, or osmolality (P>0.05 ANOVA). CONCLUSION: Prolonged resting whole-body immersion in thermally protected subjects in cold water is associated with marked loss of weight and plasma volume. These fluid changes were not associated with significant changes in serum K, Na, or osmolality.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held June 22-26, 1994. Westin Hotel, Denver, Colorado (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5745
Date: 1994

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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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