| The effects of hyperoxia on performance during simulated firefighting work. | |
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MedLine Citation:
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PMID: 10675059 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study evaluated the effects of hyperoxia (inspired oxygen fraction = 40%) on performance during a simulated firefighting work circuit (SFWC) consisting of five events. On separate days, 17 subjects completed at least three orientation trials followed by two experimental trials while breathing either normoxic (NOX) and hyperoxic (HOX) gas mixtures that were randomly assigned in double-blind, cross-over design. Previously, ventilatory threshold (Tvent) and VO2max had been determined during graded exercise (GXT) on a cycle ergometer. Lactate concentration in venous blood was assessed at exactly 5 min after both the experimental trials and after the GXT. Total time to complete the SFWC was decreased by 4% (p < 0.05) with HOX. No differences were observed in individual event times early in the circuit, however HOX resulted in a 12% improvement (p < 0.05) on the final event. A significantly decreased rating of perceived exertion (RPE) was also recorded immediately prior to the final event. No differences were observed in mean heart rate or post-exercise blood lactate when comparing NOX to HOX. Heart rates during the SFWC (both conditions) were higher than HR at Tvent, but lower than HR at VO2max (p<0.05). Post-SFWC lactate values were higher (p<0.05) than post-VO2max. These results demonstrate that hyperoxia provided a small but significant increase in performance during short duration, high intensity simulated firefighting work. |
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Authors:
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S R Petersen; R W Dreger; B E Williams; W J McGarvey |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Ergonomics Volume: 43 ISSN: 0014-0139 ISO Abbreviation: Ergonomics Publication Date: 2000 Feb |
Date Detail:
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Created Date: 2000-02-24 Completed Date: 2000-02-24 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0373220 Medline TA: Ergonomics Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 210-22 Citation Subset: IM; S |
Affiliation:
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Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Canada. speterse@per.ualberta.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cross-Over Studies Double-Blind Method Female Fires Heart Rate Humans Hyperoxia* / physiopathology Lactic Acid / blood Male Occupational Health* Physical Exertion / physiology* Task Performance and Analysis* |
| 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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