Table 2.
Results of nerve conduction studies.
| Parameters | SBMA (1) | ALS (2) | NC (3) |
P-value |
||
|---|---|---|---|---|---|---|
| 1 vs. 3 | 2 vs. 3 | 1 vs. 2 | ||||
| DML (ms) | ||||||
| Median nerve | 3.23 ± 0.66 | 3.37 ± 0.62 | 2.82 ± 0.37 | 0.001 | < 0.001 | 0.368 |
| Ulnar nerve | 2.32 ± 0.54 | 2.37 ± 0.38 | 2.11 ± 0.27 | 0.010 | < 0.001 | 0.142 |
| Tibial nerve | 3.78 ± 0.74 | 4.02 ± 0.86 | 3.60 ± 0.64 | >0.05 | < 0.05 | >0.05 |
| Peroneal nerve | 3.64 ± 0.98 | 3.84 ± 1.15 | 3.07 ± 0.66 | 0.002 | < 0.001 | 0.214 |
| CMAP amplitude (mV) | ||||||
| Median nerve | 10.14 ± 3.85 | 6.89 ± 4.77 | 14.31 ± 2.80 | <0.001 | <0.001 | <0.001 |
| Ulnar nerve | 11.62 ± 3.13 | 10.30 ± 4.89 | 15.95 ± 3.02 | <0.001 | <0.001 | 0.073 |
| Tibial nerve | 13.33 ± 5.52 | 12.03 ± 4.61 | 15.31 ± 4.41 | 0.025 | 0.001 | 0.592 |
| Peroneal nerve | 5.84 ± 2.54 | 4.60 ± 2.35 | 7.42 ± 3.25 | 0.015 | <0.001 | 0.054 |
| APB/ADM | 0.91 ± 0.36 | 0.65 ± 0.32 | 0.92 ± 0.21 | 0.962 | <0.001 | <0.001 |
| EDB/AHB | 0.47 ± 0.19 | 0.41 ± 0.21 | 0.51 ± 0.21 | 0.292 | 0.009 | 0.083 |
ADM, abductor digiti minimi; AHB, abductor halluces brevis; ALS, amyotrophic lateral sclerosis; APB, abductor pollicis brevis; CMAP, compound muscle action potential; EDB, extensor digitorum brevis; SBMA, spinobulbar muscular atrophy. Values are mean ± SD. Values with significant differences printed in bold characters. For comparisons of parameters between the SBMA patients, the ALS patients, and the normal controls, Bonferroni adjustment was used and α’ < 0.0167 was considered statistically significant.