Parameter | Abductor pollicis brevis | Abductor digit minimi | p Value | |||||
---|---|---|---|---|---|---|---|---|
Normal (A) | ALS (B) | Normal (C) | ALS (D) | A vs B | C vs D | A vs C | B vs D | |
Strength-duration time constant (ms) | 0.46 (0.02) | 0.55 (0.03) | 0.40 (0.01) | 0.42 (0.02) | 0.018* | 0.59 | 0.049* | 0.0002* |
Threshold electrotonus | ||||||||
TEd (10–30 ms) (%) | 69.5 (1.2) | 71.6 (1.7) | 65.4 (1.4) | 66.5 (1.2) | 0.31 | 0.56 | 0.039* | 0.016* |
TEd (90–100 ms) (%) | 47.2 (1.2) | 51.2 (1.2) | 48.1 (1.3) | 51.6 (1.9) | 0.041* | 0.13 | 0.69 | 0.85 |
TEh (90–100 ms) (%) | −131.3 (4.6) | −121.0 (5.6) | −130.7 (4.9) | −126.3 (5.2) | 0.17 | 0.54 | 0.92 | 0.49 |
Recovery cycle | ||||||||
Refractoriness (2.0 ms) (%) | 78.6 (13.4) | 73.8 (15.8) | 50.2 (3.4) | 45.0 (6.8) | 0.82 | 0.5 | 0.059** | 0.11 |
Supernormality (5.0 ms) (%) | −23.6 (1.4) | −28.9 (2.1) | −21.2 (1.4) | −25.6 (1.5) | 0.042* | 0.038* | 0.23 | 0.21 |
Late subnormality (42 ms) (%) | 15.4 (0.9) | 14.7 (1.2) | 9.7 (1.2) | 10.2 (1.4) | 0.67 | 0.79 | 0.0007* | 0.016* |
Data are given as mean (SEM).
*p<0.05; **p<0.1.
ALS, amyotrophic lateral sclerosis; TEd, depolarising electrotonus; TEh, hyperpolarising electrotonus.