Document Detail


Postexercise cooling interventions and the effects on exercise-induced heat stress in a temperate environment.
MedLine Citation:
PMID:  22827512     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 (HCO(3)(-)) 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:
Christophe Hausswirth; Rob Duffield; Hervé Pournot; François Bieuzen; Julien Louis; Jeanick Brisswalter; Olivier Castagna
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-24
Journal Detail:
Title:  Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme     Volume:  -     ISSN:  1715-5312     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101264333     Medline TA:  Appl Physiol Nutr Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a INSEP (National Institute of Sport, for Expertise and Performance), Research Department, 11 avenue du Tremblay 75012 Paris, France.
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