Fusimotor outflow to pretibial flexors during fatiguing contractions of the triceps surae in decerebrate cats

Brain Research
M LjubisavljevicR Anastasijevic

Abstract

Changes in discharge rate of fusimotor neurones to pretibial flexor muscles were recorded during and after long-lasting fatiguing isometric and/or isotonic contractions of triceps surae in decerebrate cats. The contractions were elicited by electrical stimulation of the nerves to triceps. Fusimotor spikes were recorded from nerve filaments dissected free from the peroneal nerve. Responses of the fusimotor neurones were diverse. In isometric regime, 22 out of 40 units recorded exhibited an initial increase at the onset of muscle contraction, different in amplitude and duration among the units. In seven of these units an additional brisk burst of spike discharges, of different duration, occurred at the end of the contraction. In 15 fusimotor neurones (14 units with the initial response and an additional unit without it) a slow increase in discharge rate developed, starting during the contraction and outlasting it. In another eleven units the initial response was a decrease in discharge rate, lasting in six of them throughout the contraction. Another six units exhibited a sustained increase in discharge rate throughout the contraction, as well as, at a lower level, but still above the spontaneous one, thereafter. Similar patterns ...Continue Reading

References

Sep 1, 1979·Experimental Brain Research·W Z RymerP E Crago
Jun 1, 1990·Archives of Disease in Childhood·R Hayward
Jan 1, 1983·Experimental Brain Research·C Capaday, J D Cooke

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