Table 2.

Comparison of properties of subgroups of low-threshold mechanoreceptive A-fibre neurones

CV range	Receptor class	n	Vm (mV)	CV (m s−1)	APdB (ms)	AP RT (ms)	AP FT (ms)	AHP80 (ms)
Overall P			n.s.	**	***	***	***	***
Aδ	D hair	8	51.6 ± 6.7	1.9 ± 0.6	1.76 ± 0.28***	0.69 ± 0.09***	1.1 ± 0.22**	3.4 ± 1.4
Aα/β	G hair/field	22	51.5 ± 6.7	9.2 ± 3.4**	1.55 ± 0.48***	0.53 ± 0.14*	1.0 ± 0.37***	3.3 ± 1.5*]*
Aα/β	T hair	6	52.4 ± 6.9	11.5 ± 2.4	1.75 ± 0.55**	0.46 ± 0.17	1.29 ± 0.48***	30 ± 17.9***]*
Aα/β	SAI & SAII	2	52.2, 61.1	15.4, 13.9	1.1, 0.7	0.33, 0.3	0.74, 0.4	1.4, 1.3
Aα/β	RA	6	55.5 ± 7.4	11.1 ± 1.7	1.54 ± 0.42*	0.48 ± 0.11	1.1 ± 0.36 *	3.6 ± 1.3
Aα/β	MS	17	52.2 ± 6.3	14 ± 5.5	0.93 ± 0.2	0.39 ± 0.07	0.54 ± 0.14	1.9 ± 0.7

Means ± s.d. for variables are given except for the SA units, for which two individual values are given. For abbreviations see Table 1. Statistical tests for each variable were made between all the groups in the table excluding the SA units due to the small numbers. In addition it was inappropriate to include the D hair group in the CV analysis. The Kruskall-Wallis test (non-parametric) with Dunn's post test was used throughout. Note that four of the Aα/β-LTM units included in Table 1 are not included on this table since their subclassification was incomplete. Aα/β hair follicle afferents and field units were combined and called G hair/field units (see text). Except in one case indicated by the bracket joining the G hair/field and T hair groups, significant differences are between the muscle spindle (MS) and the group indicated by the asterisks

^*P < 0.05

^**P < 0.01

^***P < 0.001. The absence of asterisks indicates the absence of any significant difference.