| Exercise breathing pattern during chronic altitude exposure. | |
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MedLine Citation:
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PMID: 2007398 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Breathing pattern in response to maximal exercise was examined in four subjects during a 7-day acclimatisation to a simulated altitude of 4247 m (barometric pressure, PB = 59.5 kPa). Graded exercise tests to exhaustion were performed during normoxia (day 0), and on days 2 and 7 of hypoxia, respectively. Ventilation was significantly augmented in the hypoxic environment, as were both the mean inspiratory flow (VT/TI) and inspiratory duty cycle (TI/TTOT) components of it. VI/TI was increased due to a significant increase in tidal volume (VT) and a corresponding decrease in inspiratory time duration (TI). Throughout a range of exercise ventilation, TI/TTOT was increased due to an apparently greater decrease in expiratory time duration (TE) with respect to TI. In all cases, the relation between VT and TI displayed a typical range 2 behaviour, with evidence of a range 3 occurring at very high ventilatory rates. There was essentially no difference observed in the VT-TI relation during exercise between the normoxic and hypoxic conditions. No significant changes were observed in the breathing pattern in response to exercise within the exposure period (from day 2 to day 7), although there was a discernible tendency to a higher stage 3 plateau by day 7 of altitude exposure. |
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Authors:
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I B Mekjavic; C Moric; S V Goldberg; J B Morrison; M L Walsh; E W Banister; R B Schoene |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: European journal of applied physiology and occupational physiology Volume: 62 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1991 |
Date Detail:
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Created Date: 1991-05-02 Completed Date: 1991-05-02 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY |
Other Details:
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Languages: eng Pagination: 61-5 Citation Subset: IM; S |
Affiliation:
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School of Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada. |
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 Altitude* Anoxia / physiopathology Breathing Exercises* Exercise / physiology Humans Male Respiration / physiology* Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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