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 |
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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 |
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ISSN: | 0363-6135 1522-1539 |
DOI: | 10.1152/ajpheart.00714.2002 |