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Fluid control mechanisms after exercise dehydration.

K A Kirsch·H von Ameln·H J Wicke
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Abstract

Since the osmocontrol- (osmolality), the renin-angiotensin-(PRA), and the volume control-(central venous pressure, CVP) systems are involved in the maintainance of the salt-water balance, we investigated the pattern of these parameters in the recovery period after exercise dehydration in 13 well trained long-distance runners. On average, after exercise the athletes had lost 3.1% of their body weight (BW). After eating and drinking the BW was still 1.3% below control value, indicative of continuing deficits. Plasma osmolality increased, however, from an average value of 286-290 mosmol/kg after exercise as well as postprandially, but the change was not significant. PRA-Levels rose significantly from 0.167-0.599 ng/ml . h after exercise and decreased to 0.333 ng/ml . h postprandially. CVP was significantly altered after exercise (-3.5 cm H20) as well as postprandially (-2.4 cm H20). The results suggest that the salt-water balance is maintained by the interplay of all the three systems. In conflicting situations, however, as when intercompartmental water- and solute-shifts take place during the recovery period, the volume control system triggered off by the CVP is the dominant corrective response to the prevailing deficits.U

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Blood Physiological PhenomenaDehydrationHumansOsmolar ConcentrationPhysical EndurancePhysical ExertionReninWater-Electrolyte BalanceJournal ArticleResearch Support, Non-U.S. Gov't

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K A Kirsch, H von Ameln, H J Wicke. 1981. Fluid control mechanisms after exercise dehydration.. https://doi.org/10.1007/bf00421671

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