| Influence of body position on muscle deoxy[Hb+Mb] during ramp cycle exercise. | |
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MedLine Citation:
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PMID: 20654739 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We used near-infrared spectroscopy (NIRS) to test the hypothesis that body position alters the sigmoidal response profile of muscle fractional O(2) extraction (estimated using deoxy[Hb+Mb]) during incremental cycle exercise. Seven male subjects (mean±SD age 32±13 years) completed a ramp incremental cycling test to exhaustion (30W/min) in both the supine and upright body positions. The sigmoidal (as opposed to hyperbolic) model that provided the better fit to deoxy[Hb+Mb] data during upright cycling was also present for the supine response; however, the slope of the sigmoid was increased (upright: 0.052±0.012 vs. supine: 0.090±0.036%⋅%P(peak)(-1); P<0.05) and a plateau occurred at a lower work rate (upright: 83±8 vs. supine: 68±19%P(peak)(-1); P<0.05) during supine exercise. These changes occurred in the absence of a leftward shift of the sigmoid. We also found a significantly greater deltaV(O)₂/deltaW slope above compared to below gas exchange threshold (GET) for both conditions (upright: 9.8±0.5 vs. 8.2±0.9; supine: 10.7±0.9 vs. 8.0±0.8) and for supine compared to upright cycling above GET. These findings suggest that the supine posture affects O₂ extraction and V(O)₂ kinetics to a greater extent as work rate progresses during ramp incremental exercise. |
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Authors:
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Fred J DiMenna; Stephen J Bailey; Andrew M Jones |
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Publication Detail:
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Type: Journal Article Date: 2010-07-21 |
Journal Detail:
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Title: Respiratory physiology & neurobiology Volume: 173 ISSN: 1878-1519 ISO Abbreviation: Respir Physiol Neurobiol Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-13 Completed Date: 2010-12-28 Revised Date: 2011-01-13 |
Medline Journal Info:
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Nlm Unique ID: 101140022 Medline TA: Respir Physiol Neurobiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 138-45 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier B.V. All rights reserved. |
Affiliation:
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School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Heavitree Road, Exeter, Devon EX1 2LU, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Exercise / physiology* Hemoglobins / metabolism* Humans Male Middle Aged Muscle, Skeletal / metabolism* Myoglobin / metabolism* Oxygen Consumption / physiology* Posture / physiology Pulmonary Gas Exchange Spectroscopy, Near-Infrared / methods Statistics as Topic Supine Position / physiology Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins; 0/Myoglobin; 9008-02-0/deoxyhemoglobin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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