| Validity of a single-visit protocol to estimate the maximum lactate steady state. | |
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MedLine Citation:
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PMID: 16260974 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: The maximum lactate steady state (MLSS) represents the highest intensity of exercise at which a balance exists between the rate of lactate production and the rate of lactate clearance. The MLSS is an important determinant of endurance exercise performance but its determination, which involves 4-5 laboratory visits, is labor-intensive and time consuming. PURPOSE: To compare the MLSS estimated from a single-visit protocol (MLSSsingle) with the traditional, directly measured MLSS (MLSStrad). METHODS: Following an incremental treadmill test for the determination of VO2peak, eight endurance-trained runners completed: 1) a series of 4-5 constant-speed treadmill runs of up to 30-min duration, on separate days, for determination of the MLSStrad; and 2) a single-visit protocol consisting of two constant-speed treadmill runs of 20-min duration at approximately 65 and 90% VO2peak separated by 40 min of rest, for determination of MLSSsingle. Blood lactate concentration ([La]), oxygen uptake (VO2), and heart rate (HR) were measured every 5 min in all treadmill runs. Comparisons between values were made using paired t-tests. RESULTS: The MLSSsingle significantly underestimated the MLSStrad with respect to speed (13.4 +/- 1.2 vs 16.4 +/- 1.6 km x h(-1), P = 0.002), HR (148 +/- 8 vs 170 +/- 10 b x min(-1), P < 0.001), blood [La] (2.3 +/- 1.5 vs 3.9 +/- 1.0 mmol x L(-1); P = 0.01), and % VO2peak utilized (75 +/- 8 vs 90 +/- 2%, P = 0.002). The MLSStrad speed and MLSSsingle speed were poorly correlated (r = 0.29, P = 0.49). CONCLUSION: The single-visit method of determining the MLSS substantially underestimates the actual MLSS. |
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Authors:
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Andrew E Kilding; Andrew M Jones |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 37 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2005 Oct |
Date Detail:
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Created Date: 2005-11-01 Completed Date: 2006-01-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 1734-40 Citation Subset: IM; S |
Affiliation:
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Division of Sport and Recreation, Faculty of Health and Environmental Sciences, Auckland University of Technology, New Zealand. andrew.kilding@aut.ac.nz |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Exercise / physiology* Exercise Test Heart Rate / physiology Humans Lactic Acid / blood* Oxygen Consumption Running / 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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