| Comparison of objective methods for determining ventilatory threshold. | |
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MedLine Citation:
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PMID: 3172574 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study was undertaken to compare and re-examine the relation of lactate threshold (LT) and ventilatory threshold (VT), using six objective determination methods proposed previously. Twenty-one young male subjects performed a cycle exercise test in which the work rate was increased by 150 kg.m every 2 min up to his limit of volitional fatigue. Through each test, gas exchange parameter measurements were made every 1 min (every 30 s at nearly maximal level), and the venous blood samples were taken from a warmed ear lobe at each work rate for determining blood lactate concentration. LT and its variance were determined by the intersecting straight lines regression. LT ranged from 0.72 to 1.40 l/min in terms of VO2, and the mean value of S.D. for each LT was about 0.1 l/min. Each objective method for determining VT used in this study was based on the simple modelling of the criterion for visual detection of VT, that is the non-linear increase in VE or the systematic increase in VE/VO2. When the relationship between LT and VT was examined, VT by the objective methods based on determining minimum value of VE/VO2 showed relatively high consistency with LT. Of 16-20 individuals out of all 21 subjects, there were VT within LT +/- 0.2 in VO2. It is concluded that VE/VO2 is a more sensitive index for detecting VT than VE in the gas exchange parameters, and the objective VT determination method based on minimum value of VE/VO2 could facilitate estimation of LT within an error of +/- 0.2 l/min VO2 in most normal individuals. |
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Authors:
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Y Fukuba; M Munaka; S Usui; H Sasahara |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Japanese journal of physiology Volume: 38 ISSN: 0021-521X ISO Abbreviation: Jpn. J. Physiol. Publication Date: 1988 |
Date Detail:
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Created Date: 1988-11-03 Completed Date: 1988-11-03 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985184R Medline TA: Jpn J Physiol Country: JAPAN |
Other Details:
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Languages: eng Pagination: 133-44 Citation Subset: IM; S |
Affiliation:
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Department of Biometrics, Hiroshima University, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Humans Lactates / blood* Lactic Acid Male Mathematics Physical Exertion Pulmonary Gas Exchange Respiration* |
| Chemical | |
Reg. No./Substance:
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0/Lactates; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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