Skeletal muscle blood flow and flow heterogeneity during dynamic and isometric exercise in humans

1  Turku Positron Emission Tomography Centre and 2  Department of Medicine, University of Turku, FIN-20521 Turku; and 3  Neuromuscular Research Centre, University of Jyväskylä, FIN-40351 Jyväskylä, Finland The effects of dynamic and intermittent isometric knee extension exercises on skeletal muscle...

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Veröffentlicht in:American journal of physiology. Heart and circulatory physiology 2003-03, Vol.284 (3), p.H979-H986
Hauptverfasser: Laaksonen, Marko S, Kalliokoski, Kari K, Kyrolainen, Heikki, Kemppainen, Jukka, Teras, Mika, Sipila, Hannu, Nuutila, Pirjo, Knuuti, Juhani
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Sprache:eng
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Zusammenfassung:1  Turku Positron Emission Tomography Centre and 2  Department of Medicine, University of Turku, FIN-20521 Turku; and 3  Neuromuscular Research Centre, University of Jyväskylä, FIN-40351 Jyväskylä, Finland The effects of dynamic and intermittent isometric knee extension exercises on skeletal muscle blood flow and flow heterogeneity were studied in seven healthy endurance-trained men. Regional muscle blood flow was measured using positron emission tomography (PET) and an [ 15 O]H 2 O tracer, and electromyographic (EMG) activity was recorded in the quadriceps femoris (QF) muscle during submaximal intermittent isometric and dynamic exercises. QF blood flow was 61% ( P  = 0.002) higher during dynamic exercise. Interestingly, flow heterogeneity was 13% ( P  = 0.024) lower during dynamic compared with intermittent isometric exercise. EMG activity was significantly higher ( P  <   0.001) during dynamic exercise, and the change in EMG activity from isometric to dynamic exercise was tightly related to the change in blood flow in the vastus lateralis muscle ( r  = 0.98,   P  
ISSN:0363-6135
1522-1539
DOI:10.1152/ajpheart.00714.2002