| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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.
This article has been cited by other articles:
|
|
 |
|
  W.-C. Wu, J. Wang, J. A. Detre, F. W. Wehrli, E. Mohler 3rd, S. J. Ratcliffe, and T. F. Floyd Hyperemic flow heterogeneity within the calf, foot, and forearm measured with continuous arterial spin labeling MRI Am J Physiol Heart Circ Physiol, May 1, 2008; 294(5): H2129 - H2136. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 I. Heinonen, S. V. Nesterov, J. Kemppainen, P. Nuutila, J. Knuuti, R. Laitio, M. Kjaer, R. Boushel, and K. K. Kalliokoski Role of adenosine in regulating the heterogeneity of skeletal muscle blood flow during exercise in humans J Appl Physiol, December 1, 2007; 103(6): 2042 - 2048. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. C. Hannukainen, P. Nuutila, B. Ronald, J. Kaprio, U. M. Kujala, T. Janatuinen, O. J. Heinonen, J. Kapanen, T. Viljanen, M. Haaparanta, et al. Increased physical activity decreases hepatic free fatty acid uptake: a study in human monozygotic twins J. Physiol., January 1, 2007; 578(1): 347 - 358. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. C. Hannukainen, P. Nuutila, J. Kaprio, O. J Heinonen, U. M. Kujala, T. Janatuinen, T. Ronnemaa, J. Kapanen, M. Haaparanta-Solin, T. Viljanen, et al. Relationship between local perfusion and FFA uptake in human skeletal muscle--no effect of increased physical activity and aerobic fitness J Appl Physiol, November 1, 2006; 101(5): 1303 - 1311. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Kouzaki and M. Shinohara The frequency of alternate muscle activity is associated with the attenuation in muscle fatigue J Appl Physiol, September 1, 2006; 101(3): 715 - 720. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. Babault, K. Desbrosses, M.-S. Fabre, A. Michaut, and M. Pousson Neuromuscular fatigue development during maximal concentric and isometric knee extensions J Appl Physiol, March 1, 2006; 100(3): 780 - 785. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Visit Other APS Journals Online |
