Average muscle tension triggered by stimulation of gamma fusimotor fibers

Abstract

Average soleus muscle tension of the anesthetized cat, triggered by repetitive stimulation to a fine ventral root filament of L 7, was isometrically recorded by use of blocking methods of the alpine decending impulses and it showed a twitch-like contraction with very rapid time course. Its mean time to peak and half decay time of relaxation in 12 observations was 21.7 and 26.8 msec, respectively. It was concluded that such a rapid concentration corresponds to a twitch of nuclear chain fibers.