| Are oxygen uptake kinetics modified when using a respiratory snorkel? | |
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MedLine Citation:
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PMID: 20861520 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The aim of this study was to compare VO2 kinetics during constant power cycle exercise measured using a conventional facemask (CM) or a respiratory snorkel (RS) designed for breath-by-breath analysis in swimming. METHODS: VO2 kinetics parameters-obtained using CM or RS, in randomized counterbalanced order-were compared in 10 trained triathletes performing two submaximal heavy-intensity cycling square-wave transitions. These VO2 kinetics parameters (ie, time delay: td1, td2; time constant: τ1, τ2; amplitude: A1, A2, for the primary phase and slow component, respectively) were modeled using a double exponential function. In the case of the RS data, this model incorporated an individually determined snorkel delay (ISD). RESULTS: Only td1 (8.9 ± 3.0 vs 13.8 ± 1.8 s, P < .01) differed between CM and RS, whereas all other parameters were not different (τ1 = 24.7 ± 7.6 vs 21.1 ± 6.3 s; A1 = 39.4 ± 5.3 vs 36.8 ± 5.1 mL x min(-1) x kg(-1); td2 = 107.5 ± 87.4 vs 183.5 ± 75.9 s; A2' (relevant slow component amplitude) = 2.6 ± 2.4 vs 3.1 ± 2.6 mL x min(-1) x kg(-1) for CM and RS, respectively). CONCLUSIONS: Although there can be a small mixture of breaths allowed by the volume of the snorkel in the transition to exercise, this does not appear to significantly influence the results. Therefore, given the use of an ISD, the RS is a valid instrument for the determination of VO2 kinetics within submaximal exercise. |
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Authors:
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Joana F Reis; Gregoire P Millet; Davide Malatesta; Belle Roels; Fabio Borrani; Veronica E Vleck; Francisco B Alves |
Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sports physiology and performance Volume: 5 ISSN: 1555-0265 ISO Abbreviation: Int J Sports Physiol Perform Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-23 Completed Date: 2010-12-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101276430 Medline TA: Int J Sports Physiol Perform Country: United States |
Other Details:
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Languages: eng Pagination: 292-300 Citation Subset: IM |
Affiliation:
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Department of Sport Sciences, Faculty of Human Kinetics, Technical University of Lisbon, Portugal. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Exercise Test Humans Kinetics Male Masks* Oxygen Consumption / physiology* Regression Analysis Respiratory Function Tests Swimming / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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