| Validity of breathing frequency to monitor exercise intensity in trained cyclists. | |
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MedLine Citation:
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PMID: 7657420 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study compared breathing frequency (fB) during a ventilation threshold (VT) test with fB during a simulated 40 km time trial (40TT) to assess whether fB can be used to monitor exercise intensity. Twenty-six male cyclists (mean +/- SD VO2max = 4.42 +/- 0274 l.min-1) performed an incremental VT ergometer test and a simulated 40TT on a set of wind-loaded rollers. During the 40TT, expired gas was collected for 3 min using open circuit spirometry at 10 km intervals. A significant correlation (r = 0.89; p < or = 0.05) was found between the fB threshold (VTf) and the gas exchange VT (VTg) (3.42 +/- 0.08 and 3.31 +/- 0.09 l.min-1, respectively). No differences were found in VO2 at the VTf vs. X VO2 (3.48 +/- 0.08 l.min-1) during the simulated 40TT. However, when fB in br.min-1 calculated from the VT test (32.5 br.min-1), was compared with fB during the 40TT (45.6 br.min-1), there was a significant difference. Ventilation, heart rate and the respiratory exchange ratio were all significantly higher during the 40TT. Although a significant relationship was found between the VT test and the 40TT for VTf measured in l.min-1 of VO2 (r = 0.66; p < or = 0.05), fB in br.min-1 obtained from the incremental test should not be used to identify exercise training intensity. These data suggest that during competition, trained athletes exercise at a higher fB than that determined when being tested, implying that fB in br.min-1 may not be a valid measurement of exercise intensity. |
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Authors:
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J P Neary; Y N Bhambhani; H A Quinney |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sports medicine Volume: 16 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 1995 May |
Date Detail:
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Created Date: 1995-10-03 Completed Date: 1995-10-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: GERMANY |
Other Details:
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Languages: eng Pagination: 255-9 Citation Subset: IM; S |
Affiliation:
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Department of Physical Education, Malaspina University-College, Nanaimo, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling / physiology* Exercise / physiology* Heart Rate / physiology Humans Male Oxygen Consumption / physiology Respiration / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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