Post-exercise cooling interventions and the effects on exercise-induced heat stress in a thermo-neutral environment.

Publisher:
NRC Research Press
Publication Type:
Journal Article
Citation:
Applied Physiology, Nutrition and Metabolism., 2012, 37 (5), pp. 965 - 975
Issue Date:
2012-01
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The aim of this study was to examine the effects of cool water immersion (20 ?C; CWI) while wearing a cooling jacket (Cryovest;V) and a passive control (PAS) as recovery methods on physiological and thermoregulatory responses between 2 exercise bouts in temperate conditions. Nine well-trained male cyclists performed 2 successive bouts of 45 min of endurance cycling exercise in a temperate environment (20 ?C) separated by 25 min of the respective recovery interventions. Capillary blood samples were obtained to measure lactate (La-), sodium (Na+), bicarbonate (HCO3-) concentrations and pH, whilst body mass loss (BML), core temperature ( Tcore), skin temperature ( Tskin), heart rate (HR), oxygen uptake , and minute ventilation were measured before (Pre), immediately after the first exercise bout (Ex1), the recovery (R), and after the second exercise bout (Ex2). V and CWI both resulted in a reduction of Tskin at R (-2.1 ? 0.01 ?C and -11.6 ? 0.01 ?C, respectively, p < 0.01). Despite no difference in final values post-Ex2 ( p > 0.05), V attenuated the rise in HR, minute ventilation, and oxygen uptake from Ex1 to Ex2, while Tcore and Tskin were significantly lower following the second session ( p < 0.05). Further, CWI was also beneficial in lowering Tcore, Tskin, and BML, while a rise in Na+ was observed following Ex2 ( p < 0.05). Overall results indicate that cooling interventions (V and CWI) following exercise in a temperate environment provide a reduction in thermal strain during ensuing exercise bouts.
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