PMID: 6986349Jan 1, 1980Paper

Fluid shifts and endocrine responses during chair rest and water immersion in man

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
J E GreenleafI C Keil

Abstract

To determine the effect of external water pressure per se on intercompartmental fluid volume shifts, plasma and urine electrolytes, osmotic and endocrine responses were compared in four men (21-22 yr) during 8 h of water immersion (TH2O = 34.4 degrees C) and during 8 h of chair rest (Ta = 22.5 degrees C), followed by16 h of bed rest in both regimens. Water intake was 1,800 ml during 8-h exposures. Urine volume during immersion was 2,954 ml/8 h and 1,538 ml/8 h (P less than 0.01) during chair rest; the respective decreases in extracellular volume (ECV) were 2,230 ml/8 h and 1,892 ml/8 h. Losses from the intersititial volume (1.81 vs. 1.67 liters) and plasma volume (0.43 vs. 0.23 liters) during immersion and chair rest, respectively, were approximately proportional to theri normal ratios. With a negative H2O balance (corrected for blood withdrawal) during immersion of 1,234 ml and a positive balance (190 ml) during chair rest, there appeared to be a shift of ECV to the intracellular compartment in both regimens. There was suppression of both plasma arginine vasopressin (AVP) and renin activity (PRA) during chair rest and immersion. It appears that the increased central blood volume, as opposed to increased plasma osmolality, is t...Continue Reading

Citations

Jan 1, 1988·European Journal of Applied Physiology and Occupational Physiology·D BöningT O Wagner
Jan 1, 1984·European Journal of Applied Physiology and Occupational Physiology·B NielsenF Bonde-Petersen
Oct 1, 2004·Sports Medicine·John E GreenleafDavid G Evans
Sep 17, 2009·European Journal of Applied Physiology·Chantal JimenezBruno Melin
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Jan 1, 1987·European Journal of Applied Physiology and Occupational Physiology·J P WolfS Berthelay
Aug 5, 2000·Journal of Applied Physiology·D E WatenpaughP Norsk
May 13, 2011·Annals of Behavioral Medicine : a Publication of the Society of Behavioral Medicine·Anthony W AustinRoland von Känel
Nov 29, 2007·European Journal of Applied Physiology·Leif-Hendrik BoldtHanns-Christian Gunga
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May 6, 1998·Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology·T Zenteno-Savin, M A Castellini

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