Quantitative Estimation of Sensitivity to Muscle Stretches in the Tonic Muscle Spindle Discharges of Cats.

摘要

Joint interval histogram (JIH) and power spectrum density, (PSD) of GIa unitary discharges were obtained while muscle of an anesthetized cat was stretched steadily. The PSD curve was approximated three lines in the following frequency band, below 15Hz, 15 to 35Hz and above 35Hz. The gradient between 15 to 35 Hz was steep and corresponds to how much the intrafusal fibers were activated. In a pattern of JIH, Ia discharges distributed wide in general. But, interval was regular and histogram made a group when intrafusal fibers were activated by electric stimulation on the ventral rootlet. In particular conditions, peaks were observed around 50 to 60 Hz in PSD.