Sustained and generalized extracellular fluid expansion following heat acclimation

The Journal of Physiology
Mark J PattersonNigel A S Taylor

Abstract

We measured intra- and extravascular body-fluid compartments in 12 resting males before (day 1; control), during (day 8) and after (day 22) a 3-week, exercise-heat acclimation protocol to investigate plasma volume (PV) changes. Our specific focus was upon the selective nature of the acclimation-induced PV expansion, and the possibility that this expansion could be sustained during prolonged acclimation. Acclimation was induced by cycling in the heat, and involved 16 treatment days (controlled hyperthermia (90 min); core temperature = 38.5 degrees C) and three experimental exposures (40 min rest, 96.9 min (s.d. 9.5 min) cycling), each preceded by a rest day. The environmental conditions were a temperature of 39.8 degrees C (s.d. 0.5 degrees C) and relative humidity of 59.2% (s.d. 0.8%). On days 8 and 22, PV was expanded and maintained relative to control values (day 1: 44.0 +/- 1.8; day 8: 48.8 +/- 1.7; day 22: 48.8 +/- 2.0 ml kg(-1); P < 0.05). The extracellular fluid compartment (ECF) was equivalently expanded from control values on days 8 (279.6 +/- 14.2 versus 318.6 +/- 14.3 ml kg(-1); n= 8; P < 0.05) and 22 (287.5 +/- 10.6 versus 308.4 +/- 14.8 ml kg(-1); n= 12; P < 0.05). Plasma electrolyte, total protein and albumin conce...Continue Reading

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Citations

Sep 4, 2009·European Journal of Applied Physiology·Andrew T GarrettJames D Cotter
Sep 15, 2011·European Journal of Applied Physiology·Andrew T GarrettJames D Cotter
Jan 11, 2012·European Journal of Applied Physiology·Nigel A S TaylorMark J Patterson
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