| Oxygen uptake kinetics during moderate, heavy and severe intensity "submaximal" exercise in humans: the influence of muscle fibre type and capillarisation. | |
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MedLine Citation:
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PMID: 12736837 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of the present study was to test the hypothesis that muscle fibre type influences the oxygen uptake (.VO(2)) on-kinetic response (primary time constant; primary and slow component amplitudes) during moderate, heavy and severe intensity sub-maximal cycle exercise. Fourteen subjects [10 males, mean (SD) age 25 (4) years; mass 72.6 (3.9) kg; .VO(2peak) 47.9 (2.3) ml kg(-1) min(-1)] volunteered to participate in this study. The subjects underwent a muscle biopsy of the vastus lateralis for histochemical determination of muscle fibre type, and completed repeat "square-wave" transitions from unloaded cycling to power outputs corresponding to 80% of the ventilatory threshold (VT; moderate exercise), 50% (heavy exercise) and 70% (severe exercise) of the difference between the VT and .VO(2peak). Pulmonary .VO(2) was measured breath-by-breath. The percentage of type I fibres was significantly correlated with the time constant of the primary .VO(2) response for heavy exercise (r=-0.68). Furthermore, the percentage of type I muscle fibres was significantly correlated with the gain of the .VO(2) primary component for moderate (r=0.65), heavy (r=0.57) and severe (r=0.57) exercise, and with the relative amplitude of the .VO(2) slow component for heavy (r=-0.74) and severe (r=-0.64) exercise. The influence of muscle fibre type on the .VO(2) on-kinetic response persisted when differences in aerobic fitness and muscle capillarity were accounted for. This study demonstrates that muscle fibre type is significantly related to both the speed and the amplitudes of the .VO(2) response at the onset of constant-load sub-maximal exercise. Differences in contraction efficiency and oxidative enzyme activity between type I and type II muscle fibres may be responsible for the differences observed. |
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Authors:
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Jamie S M Pringle; Jonathan H Doust; Helen Carter; Keith Tolfrey; Iain T Campbell; Giorkos K Sakkas; Andrew M Jones |
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Publication Detail:
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Type: Clinical Trial; Journal Article Date: 2003-03-14 |
Journal Detail:
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Title: European journal of applied physiology Volume: 89 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2003 May |
Date Detail:
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Created Date: 2003-05-08 Completed Date: 2004-02-27 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 289-300 Citation Subset: IM |
Affiliation:
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Department of Exercise and Sport Science, Manchester Metropolitan University, Hassall Road, Alsager ST7 2HL, 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 Anaerobic Threshold / physiology Bicycling / physiology* Capillaries / cytology Energy Transfer / physiology Exercise / physiology* Exercise Test Female Humans Kinetics Male Muscle Fibers, Skeletal / classification, cytology, physiology Muscle Fibers, Slow-Twitch / cytology, physiology* Muscle, Skeletal / blood supply*, cytology, physiology* Oxygen Consumption / physiology* Physical Endurance / physiology* Physical Exertion / physiology* Statistics as Topic |
| Comments/Corrections | |
Erratum In:
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Eur J Appl Physiol. 2004 Jun;92(1-2):232 Note: Sakkas, Giorkos K [added] |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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