| Effect of exercise protocol on deoxy[Hb + Mb]: incremental step versus ramp exercise. | |
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MedLine Citation:
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PMID: 19997005 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The aim of the present study was to investigate whether the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is specific to non-steady-state conditions. METHODS: Ten highly trained cyclists performed an incremental step (40 W x 3 min(-1)) and ramp (35 W x min(-1)) exercise. Deoxy[Hb + Mb] was measured at the distal and proximal sites of the musculus vastus lateralis throughout the exercises using near-infrared spectroscopy. Deoxy[Hb + Mb] was set out as a function of work rate (% peak power), and using curve-fitting techniques, the best-fitting model was determined. RESULTS: These procedures showed that the sigmoid pattern also provided the best fit for the pattern of deoxy[Hb + Mb] in the step exercise. Furthermore, it was observed that the sigmoid model was similar for the ramp (d = 6.9% +/- 1.1% and 6.9% +/- 1.4% x %(-1) peak power; c/d = 52.1% +/- 3.8% and 52.1% +/- 4.5% peak power, for the proximal and distal measurement sites, respectively) and the step exercise (d = 7.4% +/- 1.5% and 6.4% +/- 1.5% x %(-1) peak power; c/d = 52.3% +/- 6.0% and 52.5% +/- 4.2% peak power, for the proximal and distal measurement sites, respectively). The pattern of deoxy[Hb + Mb] was not influenced by measurement site. CONCLUSIONS: From the present study, it can be concluded that the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is not specific to non-steady-state conditions. It was hypothesized that this pattern is an expression of a nonlinear Q x m/V x O2m relationship, related to changes in muscle fiber-type recruitment. |
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Authors:
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Jan Boone; Katrien Koppo; Thomas J Barstow; Jacques Bouckaert |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 42 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-04-22 Completed Date: 2010-08-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 935-42 Citation Subset: IM; S |
Affiliation:
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Department of Movement and Sports Sciences, Ghent University, Belgium. Jan.boone@ugent.be |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Exercise / physiology* Exercise Test / methods* Hemoglobins / metabolism* Humans Male Myoglobin / metabolism* Physical Fitness / physiology Quadriceps Muscle / blood supply Spectroscopy, Near-Infrared Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins; 0/Myoglobin; 0/deoxymyoglobin; 9008-02-0/deoxyhemoglobin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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