NDLI: Muscle blood flow and flow heterogeneity during exercise studied with positron emission tomography in humans

Content Provider	Springer Nature Link
Author	Kalliokoski, Kari K. Kemppainen, Jukka Larmola, Kirsti Takala, Teemu O. Peltoniemi, Pauliina Oksanen, Airi Ruotsalainen, Ulla Cobelli, Claudio Knuuti, Juhani Nuutila, Pirjo
Copyright Year	2000
Abstract	Blood flow is the main regulator of skeletal muscle's oxygen supply, and several studies have shown heterogeneous blood flow among and within muscles. However, it remains unclear whether exercise changes the heterogeneity of flow in exercising human skeletal muscle. Muscle blood flow and spatial flow heterogeneity were measured simultaneously in exercising and in the contralateral resting quadriceps femoris (QF) muscle in eight healthy men using H15 2O and positron emission tomography. The relative dispersion (standard deviation/mean) of blood flow was calculated as an index of spatial flow heterogeneity. Average muscle blood flow in QF was 29 (10) ml · (kg muscle)−1 · min−1 at rest and 146 (54) ml · (kg muscle)−1 · min−1 during exercise (P=0.008 for the difference). Blood flow was significantly (P < 0.001) higher in the vastus medialis and the vastus intermedius than in the vastus lateralis and the rectus femoris, both in the resting and the exercising legs. Flow was more homogeneous in the exercising vastus medialis and more heterogeneous (P < 0.001) in the exercising vastus lateralis (P=0.01) than in the resting contralateral muscle. Flow was more homogeneous (P < 0.001) in those exercising muscles in which flow was highest (vastus intermedius and vastus medialis) as compared to muscles with the lowest flow (vastus lateralis and the rectus femoris). These data demonstrate that muscle blood flow varies among different muscles in humans both at rest and during exercise. Muscle perfusion is spatially heterogeneous at rest and during exercise, but responses to exercise are different depending on the muscle.
Starting Page	395
Ending Page	401
Page Count	7
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	83
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-11-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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