| Low reproducibility of many lactate markers during incremental cycle exercise. | |
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MedLine Citation:
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PMID: 21343140 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Reports on reproducibility of lactate markers usually considered only two trials. The authors assessed reproducibility of power output at seven markers in 11 fit subjects over at least six trials under tightly controlled conditions. Subjects undertook incremental exercises (50 W start, +50 W every 3 min to exhaustion) on a cycle ergometer. At each trial blood lactate concentration was determined at rest and within the final 30 s of each stage. The Rest+1, 2.0 and 4.0 mmol/l markers were determined by interpolation, the D-max and nadir using a quadratic model and the lactate slope index using an exponential plus constant model, and a visual turnpoint was determined empirically. Intraclass correlations and coefficients of variation assessed reproducibility. Power output at all markers differed significantly between subjects, but not between trials. Intraclass correlation coefficients were respectively 0.799, 0.794, 0.807, 0.903, 0.677, 0.769 and 0.648, and corresponding standard errors of measurement 11.9, 9.2, 9.1, 2.5, 9.2, 10.8 and 24.7 W. Statistical powers of detecting a 30 W increment at these markers were 0.30, 0.43, 0.42, 0.98, 0.58, 0.38 and 0.18 respectively. These results indicate that only the D-max marker has good reproducibility and that it alone can identify small but meaningful changes in training status with sufficient statistical power. |
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Authors:
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R Hugh Morton; Stephen R Stannard; Bartholomew Kay |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-21 |
Journal Detail:
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Title: British journal of sports medicine Volume: - ISSN: 1473-0480 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0432520 Medline TA: Br J Sports Med Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand. |
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Descriptor/Qualifier:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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