| The influence of acute and 23 days of intermittent hypoxic exposures on the exercise-induced forehead sweating response. | |
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MedLine Citation:
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PMID: 17242947 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effect of acute and 23 days of intermittent exposures to normobaric hypoxia on the forehead sweating response during steady-state exercise was investigated. Eight endurance athletes slept in a normobaric hypoxic room for a minimum of 8 h per day at a simulated altitude equivalent to 2,700 m for 23 days (sleep high-train low regimen). Peak oxygen uptake (VO2(peak)) and peak work rate (WR(peak)) were determined under normoxic (20.9%O(2)) and hypoxic (13.5%O(2)) conditions prior to (pre-IHE), and immediately after (post-IHE) the intermittent hypoxic exposures (IHE). Also, each subject performed three 30-min cycle-ergometry bouts: (1) normoxic exercise at 50% WR(peak) attained in normoxia (control trial; CT); (2) hypoxic exercise at 50% WR(peak) attained in hypoxia (hypoxic relative trial; HRT) and (3) hypoxic exercise at the same absolute work rate as in CT (hypoxic absolute trial; HAT). Exposure to hypoxia induced a 33 and 37% decrease (P < 0.001) in (VO2(peak)) pre-IHE and post-IHE, respectively. Despite similar relative oxygen uptake during HAT pre-IHE and post-IHE, the ratings of perceived whole-body exertion decreased substantially (P < 0.05) post-IHE. Pre-IHE the sweat secretion on the forehead (m(sw)f) was greater (P < 0.01) in the HAT (2.60 (0.80) mg cm(-2) min(-1)) compared to the other two trials (CT = 1.87 (1.09) mg cm(-2) min(-1); HRT = 1.57 (0.82) mg cm(-2) min(-1)) despite a similar exercise-induced elevation in body temperatures, resulting in an augmented (P < 0.01) gain of the sweating response (m(sw)f/Delta T(re)). The augmented (m(sw)f) and m(sw)f/Delta T(re) during the HAT were no longer evident post-IHE. Thus, it appears that exercise sweating on the forehead is potentiated by acute exposure to hypoxia, an effect which can be abolished by 23 days of intermittent hypoxic exposures. |
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Authors:
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Alan Kacin; Petra Golja; Ola Eiken; Michael J Tipton; Igor B Mekjavic |
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Publication Detail:
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Type: Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't Date: 2007-01-23 |
Journal Detail:
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Title: European journal of applied physiology Volume: 99 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2007 Mar |
Date Detail:
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Created Date: 2007-02-05 Completed Date: 2007-04-20 Revised Date: 2008-11-21 |
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: 557-66 Citation Subset: IM |
Affiliation:
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Department of Automation, Biocybernetics and Robotics, Institute Jozef Stefan, Jamova 39, Ljubljana, 1000, Slovenia. alan.kacin@vsz.uni-lj.si |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization Acute Disease Adult Altitude Anoxia / blood, physiopathology* Blood Pressure Body Temperature Regulation* Chronic Disease Erythrocyte Count Exercise* Female Forehead Heart Rate Hematocrit Humans Lactic Acid / blood Male Oxygen Consumption Physical Exertion Respiratory Mechanics Skin Temperature Sweating* Time Factors |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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