| Volume-Dependent Response of Pre-Cooling For Intermittent-Sprint Exercise in the Heat. | |
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MedLine Citation:
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PMID: 21311362 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE:: To assess the effects of pre-cooling volume on neuromuscular function and performance in free-paced intermittent-sprint exercise in the heat. METHODS:: Ten male, team-sport athletes completed four randomized trials involving an 85-min free-paced intermittent-sprint exercise protocol in 33°C±33% relative humidity. Pre-cooling sessions included whole body (WB), head+hand (HH), head (H) and no cooling (CONT), applied for 20-min pre-exercise and 5-min mid-exercise. Maximal voluntary contractions (MVC) were assessed pre- and post-intervention and mid- and post-exercise. Exercise performance was assessed with sprint times, % decline and distances covered during free-paced bouts. Measures of core (Tc) and skin (Tsk) temperatures, heart rate, perceptual exertion and thermal stress were monitored throughout. Venous and capillary blood was analyzed for metabolite, muscle damage and inflammatory markers. RESULTS:: WB pre-cooling facilitated the maintenance of sprint times during the exercise protocol with reduced % decline (P=0.04). Mean and total hard running distances increased with pre-cooling 12% compared to CONT (P<0.05), specifically, WB was 6-7% greater than HH (P=0.02) and H (P=0.001) respectively. No change was evident in mean voluntary or evoked force pre- to post-exercise with WB and HH cooling (P>0.05). WB and HH cooling reduced Tcby 0.1-0.3°C compared to other conditions (P<0.05). WB Tsk was suppressed for the entire session (P=0.001). HR responses following WB cooling were reduced (P=0.05; d=1.07) compared to CONT conditions during exercise. CONCLUSION:: A relationship between pre-cooling volume and exercise performance seems apparent, as larger surface area coverage augmented subsequent free-paced exercise capacity, in conjunction with greater suppression of physiological load. Maintenance of MVC with pre-cooling, despite increased work output suggests the role of centrally-mediated mechanisms in exercise pacing regulation and subsequent performance. |
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Authors:
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Geoffrey M Minett; Rob Duffield; Frank E Marino; Marc Portus |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-8 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 School of Human Movement Studies, Charles Sturt University, Bathurst, NSW, Australia 2 Sport Science Sport Medicine Unit, Cricket Australia Centre of Excellence, Albion, QLD, Australia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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