Table 2.

FCR axon excitability parameters in the paretic (P), non-paretic (NP), and control (C) limbs.

Excitability parameter	Paretic n = 16	Non-paretic n = 16	Control n = 19	P vs. NP p-value	P vs. C p-value	NP vs. C p-value
Stimulus–response
CMAP peak (mV)	7.6 ± 0.7	9.4 ± 0.4	9.8 ± 0.3	0.01	0.006	0.4
Latency (ms)	5.0 ± 0.1	4.8 ± 0.1	4.7 ± 0.1	0.1	0.02	0.3
Stimulus (mA) for 50%max	7.9 ± 0.7	7.4 ± 0.6	5.9 ± 0.4	0.4	0.05	0.08
Stimulus–response slope	3.9 ± 0.2	3.4 ± 0.2	3.5 ± 0.1	0.01	0.1	0.8
Stimulus width-charge
SDTC (ms)	0.456 ± 0.015	0.418 ± 0.016	0.487 ± 0.018	0.05	0.2	0.009
Rheobase (mA)	5.1 ± 0.5	4.9 ± 0.4	3.8 ± 0.3	0.6	0.06	0.07
Recovery cycle
RRP (ms)	3.77 ± 0.21	3.23 ± 0.15	3.73 ± 0.16	0.0002	0.9	0.02
Refractoriness at 2.5 ms (%)	28.5 ± 5.4	17.6 ± 3.5	33.1 ± 3.6	0.0008	0.5	0.004
Superexcitability (%)	−10.5 ± 1.9	−12.9 ± 1.9	−8.2 ± 1.3	0.05	0.3	0.03
Subexcitability (%)	11.9 ± 1.8	10.2 ± 1.4	13.1 ± 1.6	0.4	0.6	0.2
TE to ±40% currents
TEd (10–20 ms) (%)	65.6 ± 1.7	65.5 ± 1.7	61.9 ± 1.0	0.9	0.06	0.07
TEd (40–60 ms) (%)	54.7 ± 2.2	55.7 ± 2.0	49.7 ± 1.0	0.5	0.03	0.007
TEd (90–100 ms) (%)	50.4 ± 1.8	51.0 ± 1.6	44.9 ± 1.1	0.7	0.02	0.007
TEd (undershoot) (%)	−11.8 ± 0.7	−11.0 ± 1.0	−12.9 ± 0.6	0.6	0.3	0.1
S2 accommodation (%)	15.9 ± 0.6	16.0 ± 1.0	17.0 ± 0.7	0.8	0.2	0.4
Accommodation ½-time (ms)	41.5 ± 1.3	41.7 ± 0.7	40.2 ± 0.7	0.4	0.4	0.1
TEh (10–20 ms) (%)	−72.9 ± 1.9	−72.2 ± 1.4	−69.4 ± 1.1	0.6	0.1	0.1
TEh (20–40 ms) (%)	−93.7 ± 3.4	−91.9 ± 2.2	−85.8 ± 1.7	0.5	0.03	0.03
TEh (90–100 ms) (%)	−138.7 ± 7.1	−136.2 ± 5.5	−120.1 ± 3.5	0.6	0.01	0.01
TEh (overshoot) (%)	3.7 ± 0.8	3.7 ± 0.9	5.9 ± 0.6	0.5	0.04	0.07
I/V relationship
Resting I/V slope	0.53 ± 0.03	0.52 ± 0.02	0.60 ± 0.01	0.6	0.02	0.009
Minimum I/V slope	0.17 ± 0.00	0.17 ± 0.00	0.18 ± 0.00	0.9	0.01	0.03
Hyperpolarizing I/V slope	0.27 ± 0.02	0.30 ± 0.02	0.23 ± 0.01	0.1	0.1	0.005