title: Postexercise cooling interventions and the effects on exercise-induced heat stress in a temperate environment.
abstract: 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 (T(core)), skin temperature (T(skin)), 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 T(skin) 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 T(core) and T(skin) were significantly lower following the second session (p < 0.05). Further, CWI was also beneficial in lowering T(core), T(skin), 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.
authors: National Institute of Sport, for Expertise and Performance, Research Department, Paris, France. christophe.hausswirth@insep.fr
authors: Christophe
authors: C
authors: Hausswirth
authors: Rob
authors: R
authors: Duffield
authors: Hervé
authors: H
authors: Pournot
authors: François
authors: F
authors: Bieuzen
authors: Julien
authors: J
authors: Louis
authors: Jeanick
authors: J
authors: Brisswalter
authors: Olivier
authors: O
authors: Castagna
mesh_terms: D000328:Adult; D056352:Athletes; D054874:Athletic Performance; D001642:Bicycling; D001833:Body Temperature Regulation; D003020:Clothing; D003080:Cold Temperature; D018592:Cross-Over Studies; D015444:Exercise; D006339:Heart Rate; D018882:Heat Stress Disorders / Q000097:blood / Q000378:metabolism / Q000534:rehabilitation / Q000628:therapy*; D006801:Humans; D007101:Immersion; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption; D012123:Pulmonary Ventilation; D012964:Sodium / Q000097:blood; D013997:Time Factors; D055815:Young Adult
chemical_list: D019344:Lactic Acid; D012964:Sodium