The Effect of Plasma Osmolality and Baroreceptor Loading Status on Postexercise Heat Loss Responses

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Gabrielle PaullGlen P Kenny

Abstract

We examined the separate and combined effects of plasma osmolality and baroreceptor loading status on postexercise heat loss responses. Nine young males completed a 45-min treadmill exercise protocol at 58±2% VO2peak followed by a 60-min recovery. On separate days, participants received 0.9% NaCl (ISO), 3.0% NaCl (HYP) or no infusion (natural recovery) throughout exercise. In two additional sessions (no infusion), lower-body negative (LBNP) or positive (LBPP) pressure was applied throughout the final 45-min of recovery. Local sweat rate (LSR; ventilated capsule: chest, forearm, upper back, forehead) and skin blood flow (SkBF; laser-Doppler flowmetry: forearm, upper back) were continuously measured. During HYP, upper back LSR was attenuated from end-exercise to 10-min of recovery by ~0.35±0.10 mg·min(-1)·cm(-2) and during the last 20-min of recovery by ~0.13±0.03 mg·min-1·cm-2 while chest LSR was lower by 0.18±0.06 mg·min(-1)·cm(-2) at 50 min of recovery when compared to natural recovery (all P<0.05). Forearm and forehead LSR were not affected by plasma hyperosmolality during HYP (all P>0.28), which suggests regional differences in the osmotic modulation of postexercise LSR. Furthermore, LBPP application attenuated LSR by ~0.07-...Continue Reading

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Citations

Nov 25, 2016·Journal of Applied Physiology·Glen P Kenny, Ryan McGinn
Mar 23, 2017·European Journal of Applied Physiology·Naoto FujiiTakeshi Nishiyasu

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