Table 2.

Maximum tetanic force and innervation-related parameters of irradiated and non-irradiated muscles studied 61–112 days after nerve crush or botulinum paralysis

Group	Maximum tetanic force (P0, mN)	ACh (0.2 mm) contracture (%P0)	Degree of innervation, twitch (%)	Twitch/tetanus ratio	No. of muscles
Nerve crush after irradiation	102 ± 40*	4.1 (2.7, 6.8)	98 (90, 100)	0.20 ± 0.02	5
Nerve crush	159 ± 29	2.3 (1.8, 3.0)	100 (97, 100)	0.19 ± 0.02	7
Botulinum toxin after irradiation	92 ± 22*	30 (22, 34)§	61 (46, 65)§	0.37 ± 0.04†	9
Botulinum toxin	136 ± 32	15 (12, 18)	79 (75, 94)	0.25 ± 0.02‡	8

Values are means ± s.d. or medians with 25th and 75th percentile in brackets. Degree of innervation, twitch: ratio of indirectly and directly evoked twitch contraction force in per cent. Statistically significant differences: P < 0.05 compared with:

^*the appropriate (denervated in a similar way) control group

^†all other groups

^‡nerve crush group (one-way ANOVA-Tukey's test)

^§all other groups (one-way ANOVA on ranks – Dunn's test).