Title :
Quantitative estimation of sensitivity to muscle stretches in the tonic muscle spindle discharges of cats
Author :
Mizote, M. ; Matsuzaki, H.
Author_Institution :
Teikyo Heisei Univ., Chiba, Japan
Abstract :
The joint interval histogram (JIH) and power spectrum density (PSD) of GIa unitary discharges were obtained whilst a muscle of an anesthetized cat was stretched steadily. The PSD curve was approximated by three lines in the following frequency bands: below 15 Hz, 15 to 35 Hz, and above 35 Hz. The gradient between 15 to 35 Hz was steep and corresponds to how much the intrafusal fibers were activated. In the JIH pattern, Ia discharges were widely distributed in general. However, the interval was regular and the histogram formed a group when the intrafusal fibers were activated by electric stimulation on the ventral rootlet. In particular conditions, peaks were observed around 50 to 60 Hz in PSD.
Keywords :
biomechanics; electromyography; 15 to 60 Hz; GIa unitary discharges; anesthetized cat; extrafusal muscle fibers; gallamine injection; gamma fusimotor stimulation; intrafusal fibers activation; joint interval histogram; power spectrum density; steady stretches; tonic muscle spindle discharges; ventral rootlet; ventral stimulations; Blood; Cats; Frequency; Histograms; Magnetic analysis; Magnetic separation; Muscles; Recruitment; Sampling methods; Spinal cord;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1020425
