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Muscle oxygen extraction and perfusion heterogeneity during continuous and intermittent static exercise
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
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2003 (English)In: Journal of Applied Physiology, ISSN 8750-7587, Vol. 94, 953-958 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to compare the effects of intermittent and continuous static exercise on muscle perfusion, perfusion heterogeneity, and oxygen extraction. Perfusion and oxygen uptake of quadriceps femoris muscle were measured in 10 healthy men by using positron emission tomography and [(15)O]H(2)O and [(15)O]O(2) first during intermittent static exercise [10% of maximal static force (MSF)] and thereafter during continuous static exercise at the same tension-time level (5% static; 5% of MSF). In 4 of these subjects, perfusion was measured during continuous static exercise with 10% of MSF (10% continuous) instead of the second [(15)O]O(2) measurement. Muscle oxygen consumption was similar during intermittent and 5% continuous, but muscle perfusion was significantly higher during 5% continuous. Consequently, muscle oxygen extraction fraction was lower during 5% continuous. Perfusion was also more heterogeneous during 5% continuous. When exercise intensity was doubled during continuous static exercise (from 5% continuous to 10% continuous), muscle perfusion increased markedly. These results suggest that continuous, low-intensity static exercise decreases muscle oxygen extraction and increases muscle perfusion and its heterogeneity compared with intermittent static exercise at the same relative exercise intensity.

Place, publisher, year, edition, pages
2003. Vol. 94, 953-958 p.
Keyword [en]
blood flow, oxygen consumption, isometric exercise
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-3395DOI: 10.1152/japplphysiol.00731.2002Local ID: 3396OAI: oai:DiVA.org:miun-3395DiVA: diva2:28427
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-01-10Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf