Force and surface mechanomyogram relationship in cat gastrocnemius

摘要: The aim of this study was to compare the force (F) and muscle transverse diameter changes during electrical stimulation motor nerve. In four cats exposed nerves medial gastrocnemius were stimulated as follows: (a) eight separate trials at fixed firing rates (FR) from 5 50 Hz (9 s duration, supramaximal amplitude); (b) linear sweep in 2.5, 5, 7.5 10 (supramaximal amplitude, trials); (c) 40 Hz, units (MUs) being orderly recruited s. surface displacement detected by a laser distance sensor pointed surface. resulting signal termed mechanomyogram (MMG). patterns average F MMG increased with FR. With respect their values amplitude unfused oscillations much larger than force. rising phase always earlier F. trials, less first second half recruiting time. had an opposite behaviour. results indicate that lateral are not linearly related. different behaviour MMG, low high level MUs' pool activation, suggests generation dimensional change processes influenced components mechanical model.