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Fluid control mechanisms after exercise dehydration

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Summary

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 H2O) as well as postprandially (−2.4 cm H2O).

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.

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Authors and Affiliations

  1. Department of Physiology, Free University of Berlin and Leistungszentrum Berlin, Arnimallee 22, D-1000, Berlin 33

    K. A. Kirsch, H. von Ameln & H. J. Wicke

Authors
  1. K. A. Kirsch
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  2. H. von Ameln
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  3. H. J. Wicke
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Supported by the Bundesinstitut für Sportwissenschaften, Köln

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Kirsch, K.A., von Ameln, H. & Wicke, H.J. Fluid control mechanisms after exercise dehydration. Europ. J. Appl. Physiol. 47, 191–196 (1981). https://doi.org/10.1007/BF00421671

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  • DOI: https://doi.org/10.1007/BF00421671

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