| Lactate threshold does not influence metabolic responses during exercise in cyclists. | |
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MedLine Citation:
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PMID: 17111311 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to compare plasma markers of metabolic stress and other physiological parameters during prolonged endurance exercise of different intensity in trained subjects possessing a "high" or "low" lactate threshold (LT) expressed as a percentage (%) of peak power output (PPO). Fifteen trained male cyclists completed an incremental exercise test for determination of PPO and the LT (% PPO). Each subject then completed a 90-min and 20-min exercise trial at an intensity representing 75 and 85 % of PPO, respectively. Blood lactate (La), as well as plasma hypoxanthine (Hx) and uric acid (UA) were measured during each exercise trial. The responses in two groups, one (n = 8) with a LT approximately 65 % PPO (LT (low)), the other group (n = 7) with a LT approximately 75 % (LT (high)) (p < 0.01), were then compared. With the exception of UA, La and Hx increased significantly (p < 0.01) throughout each exercise trial compared to rest. However, there were no significant differences in each trial between the two groups of cyclists. There were also no significant differences in the other physiological parameters in each exercise trial between the subjects in LT (low) and LT (high). This study demonstrates that in trained cyclists homogeneous in terms of PPO, plasma markers of metabolic demand during prolonged exercise are not influenced by the LT when measured in an incremental exercise test. |
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Authors:
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D J Bentley; L R McNaughton; S Roberts; V E Vleck; L Fairbanks; T Marinaki |
Publication Detail:
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Type: Journal Article Date: 2006-11-16 |
Journal Detail:
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Title: International journal of sports medicine Volume: 28 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-06-01 Completed Date: 2007-08-15 Revised Date: - |
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: 506-12 Citation Subset: IM |
Affiliation:
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Health and Exercise Science, School of Medical Sciences, University of New South Wales, Sydney 2052, Australia. d.bentley@unsw.edu.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anthropometry Bicycling / physiology* Exercise Test* Fatigue / physiopathology Humans Lactic Acid / analysis*, blood, metabolism* Male Oxygen Consumption / physiology |
| 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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