| Oxygen uptake, cardiac output and muscle deoxygenation at the onset of moderate and supramaximal exercise in humans. | |
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MedLine Citation:
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PMID: 21190035 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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[Formula: see text], [Formula: see text] and muscular deoxyhaemoglobin (HHb) kinetics were determined in 14 healthy male subjects at the onset of constant-load cycling exercise performed at 80% of the ventilatory threshold (80%(VT)) and at 120% of [Formula: see text] (120%(Wmax)). An innovative approach was applied to calculate the time constant (τ(2)) of the primary phase of [Formula: see text] and [Formula: see text] kinetics at 120%(Wmax). Data were linearly interpolated after a semilogarithmic transformation of the difference between required/steady state and measured values. Furthermore, [Formula: see text], [Formula: see text] and HHb data were fitted with traditional exponential models. τ(2) of [Formula: see text] kinetics was longer (62.5 ± 20.9 s) at 120%(Wmax) than at 80%(VT) (27.8 ± 10.4 s). The τ(2) of [Formula: see text] kinetics was unaffected by exercise intensity and, at 120% of [Formula: see text] it was significantly faster (τ(2) = 35.7 ± 28.4 s) than that of [Formula: see text] response. The time delay of HHb kinetics was shorter (4.3 ± 1.7 s) at 120%(Wmax) than at 80%(VT) (8.5 ± 2.6 s) suggesting a larger mismatch between O(2) uptake and delivery at 120%(Wmax). These results suggest that [Formula: see text] at the onset of exercise is not regulated/limited by muscle's O(2) utilisation and that a slower adaptation of capillary perfusion may cause the deceleration of [Formula: see text] kinetics observed during supramaximal exercise. |
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Authors:
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A Adami; S Pogliaghi; G De Roia; C Capelli |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2010-12-29 |
Journal Detail:
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Title: European journal of applied physiology Volume: - ISSN: 1439-6327 ISO Abbreviation: - Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Neurological, Neuropsychological, Morphological and Motor Sciences, School of Exercise and Sport Sciences, University of Verona, Via Felice Casorati, 43, 37131, Verona, Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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