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Articles in PresS, published online ahead of print November 21, 2002
Am J Physiol Heart Circ Physiol, 10.1152/ajpheart.00714.2002
Submitted on August 14, 2002
Accepted on November 6, 2002
1 Turku PET Centre, University of Turku, Turku, Finland
2 Neuromuscular Research Centre, University of Jyvaskyla, Jyvaskyla, Finland
3 Turku PET Centre, University of Turku, Turku, Finland; Department of Medicine, University of Turku, Turku, Finland
* To whom correspondence should be addressed. E-mail: marko.laaksonen{at}tyks.fi.
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 [15O]H2O tracer, and electromyographic activity (EMG) was recorded in m. quadriceps femoris (QF) 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 as compared to 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 m. vastus lateralis (r=0.98; p<0.001) but not in m. rectus femoris (r=-0.09; p=0.942). In conclusion, dynamic exercise causes higher and less heterogeneous blood flow than intermittent isometric exercise at the same exercise intensity. These responses are, at least partly, related to the increased EMG activity.
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