Der Einfluß von Muskelarbeit auf das Myosonogramm

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Abstract
The purpose of this study was to examine quantitatively the change of muscle thickness and echo intensity caused by muscle exercise in healthy persons. 16 healthy volunteers (7 women, 9 men), aged 23 to 37 years, underwent static exercises of the rectus abdominis, rectus femoris/vastus intermedius, and tibialis anterior muscles. In addition, the rectus femoris/vastus intermedius muscles were exercised dynamically. Thicknesses of these muscles were measured before and during/after exercise using the electronic caliper and computer-assisted gray-scale analysis of the echo signals. Short, maximal isometric contraction resulted in an increase of thickness by 5 to 18% depending on the examined muscle (p < 0.01). The echo intensity of the rectus femoris and vastus intermedius muscles decreased significantly (-8% and -26%, p < 0.01). The increase of muscle thickness immediately after isometric exercise for up to 90 s was significantly correlated to the duration of contraction (r = 0.26 to 0.49, p < 0.05). Muscle echo intensities did not significantly correlate with the duration of the contraction. After dynamic exercise on a bicycle ergometer both thickness of the rectus femoris/vastus intermedius muscles (+12.5%, p < 0.01) and echo intensity of the vastus intermedius muscle increased (+19.5%, p < 0.01). The change of echo intensity of the vastus intermedius muscle after static and dynamic exercise was significantly different (-26% vs. +18%, p < 0.001). Muscle thickness increases during and after static as well as dynamic exercise. Echo intensity may be unchanged, decreased or increased, depending on the exercised muscle and mode of exercise.

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