| Influence of repeated sprint training on pulmonary O2 uptake and muscle deoxygenation kinetics in humans. | |
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MedLine Citation:
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PMID: 19342439 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We hypothesized that a short-term training program involving repeated all-out sprint training (RST) would be more effective than work-matched, low-intensity endurance training (ET) in enhancing the kinetics of oxygen uptake (Vo(2)) and muscle deoxygenation {deoxyhemoglobin concentration ([HHb])} following the onset of exercise. Twenty-four recreationally active subjects (15 men, mean +/- SD: age 21 +/- 4 yr, height 173 +/- 9 cm, body mass 71 +/- 11 kg) were allocated to one of three groups: RST, which completed six sessions of four to seven 30-s RSTs; ET, which completed six sessions of work-matched, moderate-intensity cycling; and a control group (CON). All subjects completed moderate-intensity and severe-intensity "step" exercise transitions before (Pre) and after the 2-wk intervention period (Post). Following RST, [HHb] kinetics were speeded, and the amplitude of the [HHb] response was increased during both moderate and severe exercise (P < 0.05); the phase II Vo(2) kinetics were accelerated for both moderate (Pre: 28 +/- 8, Post: 21 +/- 8 s; P < 0.01) and severe (Pre: 29 +/- 5, Post: 23 +/- 5 s; P < 0.05) exercise; the amplitude of the Vo(2) slow component was reduced (Pre: 0.52 +/- 0.19, Post: 0.40 +/- 0.17 l/min; P < 0.01); and exercise tolerance during severe exercise was improved by 53% (Pre: 700 +/- 234, Post: 1,074 +/- 431 s; P < 0.01). None of these parameters was significantly altered in the ET and CON groups. Six sessions of RST, but not ET, resulted in changes in [HHb] kinetics consistent with enhanced fractional muscle O(2) extraction, faster Vo(2) kinetics, and an increased tolerance to high-intensity exercise. |
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Authors:
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Stephen J Bailey; Daryl P Wilkerson; Fred J Dimenna; Andrew M Jones |
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Publication Detail:
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Type: Journal Article Date: 2009-04-02 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 106 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2009-05-27 Completed Date: 2009-07-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1875-87 Citation Subset: IM |
Affiliation:
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University of Exeter, Exeter, Devon, EX1 2LU, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology* Bicycling / physiology* Exercise / physiology* Exercise Test Female Hemoglobins / analysis, metabolism Humans Lung / metabolism* Male Muscle, Skeletal / metabolism* Oxygen / metabolism Oxygen Consumption / physiology* Spectroscopy, Near-Infrared Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins; 7782-44-7/Oxygen; 9008-02-0/deoxyhemoglobin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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