| Polynomial modeling for the identification of lactate minimum velocity by different methods. | |
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MedLine Citation:
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PMID: 19188890 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIM: The lactate minimum (LM) protocol has been used to assess aerobic fitness and to predict exercise intensity associated with the maximal blood lactate steady state. The aim of this study was to compare different methods to identify the lactate minimum velocity (LMV) on cycling. METHODS: Fourteen male cyclists (26.8+/-4.5 years; 173.2+/-6.1 cm; 67.3+/-5.2 kg; 5,8+/-2.9 years of training) performed the LM test in a velodrome. The protocol consisted of an all out 2 km time trial to elevate blood lactate (bLAC), followed by 8 min of recovery and then 6 bouts of 2 km starting 5 kmxh(-1) below the individual mean velocity for the 6 km performance. The velocity was incremented by 1 kmxh(-1) at each bout with 25 microL of capillary blood being collected for bLAC measurements (YSI 2700 STAT). The LMV was identified visually (vLMV), and by applying a second grade polynomial function on 6 (pLMV(6)) and 3 (pLMV(3)) incremental bouts. Additionally, a method where the bLACx work velocity(-1) quotients (LMVQ) were plotted against the correspondent velocity during the incremental test, identified the LMV by considering 6 (LMVQ(6)) or 3 bouts (LMVQ(3)). RESULTS: ANOVA showed no differences between vLMV (33.1+/-2.5 kmxh(-1)), pLMV(6) (32.9+/-2.5 kmxh(-1)), pLMV(3) (33.2+/-2.3 kmxh(-1)), LMVQ(6) (32.8+/-2.5 kmxh(-1)) and LMVQ(3) (33.4+/-2.3 kmxh(-1)), with high correlation among them. CONCLUSIONS: It was possible to identify the LMV by the methods proposed in the present study, even when the results of only 3 bouts of the test were modeled by polynomial function. Such an approach enables a more practical and economical test in addition to minimizing the discomfort due to several blood collections. |
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Authors:
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H G Simões; W C Hiyane; R C Sotero; E Pardono; G M Puga; L C J Lima; C S G Campbell |
Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: The Journal of sports medicine and physical fitness Volume: 49 ISSN: 0022-4707 ISO Abbreviation: J Sports Med Phys Fitness Publication Date: 2009 Mar |
Date Detail:
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Created Date: 2009-02-03 Completed Date: 2009-07-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0376337 Medline TA: J Sports Med Phys Fitness Country: Italy |
Other Details:
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Languages: eng Pagination: 14-8 Citation Subset: IM |
Affiliation:
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Unit of Physical Activity and Health, Catholic University of Brasilia, Brasìlia, DF, Brazil. hsimoes@pos.ucb.br |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold / physiology* Bicycling / physiology* Exercise Test Exercise Tolerance / physiology Fatigue Follow-Up Studies Heart Rate / physiology Humans Lactic Acid / blood* Male Muscle Strength / physiology* Oxygen Consumption / physiology* Physical Endurance / physiology* Track and Field / 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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