Table 1.

Summary of the effect of sympathetic stimulation on la and ll muscle spindle afferent discharge during trapezoidal stretches, in non-curarised and curarised rabbits

			Non-curarised		Curarised
			Ia (n = 14)	II (n = 9)	Ia (n = 11)	II (n = 15)
IF	Control (±s.d.) (Hz)		22.8 ± 18.3	42.2 ± 13.6	1.0 ± 2.7	36.1 ± 15.9
	Mean change (±s.d.) (Hz)		−7.5 ± 10.8*	−4.8 ± 23.3	9.1 ± 25.2	12.7 ± 12.9**
	% change of control		−32.9	−11.4	920	35.2
	Distribution of effects	U	1	1	8	4
		I	3	4	2	10
		D	10	4	1	1
DD	Control (±s.d.) (Hz)		98.4 ± 45.0	50.3 ± 18.5	74.8 ± 19.8	35.3 ± 13.7
	Mean change (±s.d.) (Hz)		−16.2 ± 16.2**	−12.4 ± 7.9**	−14.5 ± 22.0*	−8.2 ± 9.5**
	% change of control		−16.5	−24.6	−19.4	−23.2
	Distribution of effects	U	5	1	6	3
		I	0	0	0	1
		D	9	8	5	9
SD	Control (±s.d.) (Hz)		35.8 ± 15.7	35.8 ± 21.2	33.6 ± 10.9	17.5 ± 8.1
	Mean change (±s.d.) (Hz)		−12.6 ± 11.7**	−10.5 ± 11.5*	−12.5 ± 16.4*	−3.7 ± 5.5*
	% change of control		−35.2	−29.3	−37.2	−21.1
DI	Control (±s.d.) (Hz)		62.6 ± 40.9	14.5 ± 12.4	41.3 ± 18.3	17.8 ± 6.6
	Mean change (±s.d.) (Hz)		−3.6 ± 12.8	−1.9 ± 8.1	−2.1 ± 18.6	−4.5 ± 5.6**
	% change of control		−5.7	−13.1	−5.1	−25.3

IF, initial frequency; DD, dynamic difference; SD, static difference, DI, dynamic index. For IF and DD, observed distribution of effects is indicated by the number of units which exhibited increase (I), decrease (D) or remained unchanged (U, if vaaariability is below 5 %)

^**P < 0.01

^*P < 0.05.