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J Appl Physiol 78: 807-809, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 78, Issue 3 807-809, Copyright © 1995 by American Physiological Society

ARTICLES

Relationship between MRI relaxation time and muscle fiber composition

J. A. Houmard, R. Smith and G. L. Jendrasiak
Human Performance Laboratory, East Carolina University, Greenville, North Carolina 27858, USA.

The relationship between nuclear magnetic resonance relaxation time obtained with magnetic resonance imaging (MRI) and muscle fiber composition of the lateral gastrocnemius was examined in 13 men. There was a positive correlation (r = 0.80, P < or = 0.001) between longitudinal relaxation time and the relative percentage of slow-twitch muscle fibers (type I). There was no relationship between transverse relaxation time and type I percentage (r = 0.17, P = 0.57). These results suggest that MRI longitudinal relaxation time can be used for the noninvasive estimation of muscle fiber composition in humans.


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