| Induction and decay of short-term heat acclimation. | |
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MedLine Citation:
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PMID: 19727796 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this work was to investigate adaptation and decay from short-term (5-day) heat acclimation (STHA). Ten moderately trained males (mean +/- SD age 28 +/- 7 years; body mass 74.6 +/- 4.4 kg; VO2peak 4.26 +/- 0.37 l min(-1)) underwent heat acclimation (Acc) for 90-min on 5-days consecutively (T (a) = 39.5 degrees C, 60% RH), under controlled hyperthermia (rectal temperature 38.5 degrees C). Participants completed a heat stress test (HST) 1 week before acclimation (Acc), then on the 2nd and 8th day (1 week) following Acc (T (a) = 35 degrees C, 60% RH). Seven participants completed HSTs 2 and 3 weeks after Acc. HST consisted of 90-min cycling at 40% peak power output before an incremental performance test. Rectal temperature at rest (37.1 +/- 0.4 degrees C) was not lowered by Acc (95% CI -0.3 to 0.2 degrees C), after 90-min exercise (38.6 +/- 0.5 degrees C) it reduced 0.3 degrees C (-0.5 to -0.1 degrees C) and remained at this level 1 week later (-0.5 to -0.1 degrees C), but not two (0.1 degrees C -0.4 to 0.5 degrees C; n = 7) or 3 weeks. Similarly, heart rate after 90-min exercise (146 +/- 21 b min(-1)) was reduced (-13: -6 to -20 b min(-1)) and remained at this level after 1 week (-13: -6 to -20 b min(-1)) but not two (-9: 6 to -23 b min(-1); n = 7) or 3 weeks. Performance (746 s) increased 106 s: 59 to 152 s after Acc and remained higher after one (76 s: 31 to 122) but not two (15 s: -88 to 142 s; n = 7) or 3 weeks. Therefore, STHA (5-day) induced adaptations permitting increased heat loss and this persisted 1 week but not 2 weeks following Acc. |
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Authors:
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Andrew T Garrett; Niels G Goosens; Nancy J Rehrer; Nancy G Rehrer; Mark J Patterson; James D Cotter |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-09-01 |
Journal Detail:
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Title: European journal of applied physiology Volume: 107 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2010-01-21 Completed Date: 2010-03-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 659-70 Citation Subset: IM |
Affiliation:
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School of Physical Education, University of Otago, Dunedin, New Zealand. a.t.garrett@herts.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization
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physiology* Adult Aldosterone / blood Bicycling Blood Volume / physiology Carbon Monoxide / blood Heart Rate / physiology Heat Stress Disorders / physiopathology* Hot Temperature* Humans Hydrocortisone / blood Male Oxygen Consumption / physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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50-23-7/Hydrocortisone; 52-39-1/Aldosterone; 630-08-0/Carbon Monoxide |
| Comments/Corrections | |
Erratum In:
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Eur J Appl Physiol. 2009 Dec;107(6):671 Note: Rehrer, Nancy G [corrected to Rehrer, Nancy J] |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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