Table 1.
Baseline measures of cortical excitability (mean ± SD) in the two age groups.
| Young adults (n = 20) | Older adults (n = 18) | |
|---|---|---|
| Baseline measurements for iTBS (APB muscle) | ||
| Resting MT (% output) | 43.0 ± 8.6 | 47.6 ± 10.8 |
| MEP amplitude (μV) | 560.9 ± 408.2 | 569.5 ± 484.6 |
| MEP latency (ms) | 21.3 ± 0.3 | 24.1 ± 2.8* |
| AMT (% output) | 63.9 ± 11.1 | 64.1 ± 8.9 |
| Baseline measurements for SAI (FDI muscle) | ||
| Resting MT (% output) | 42.6 ± 9.3 | 46.2 ± 11.2 |
| MEP amplitude (µV) | 898.2 ± 826.5 | 507.6 ± 484.9 |
| MEP latency (ms) | 21.0 ± 1.6 | 24.4 ± 3.0* |
| Intensity MNS (V) | 6.3 ± 2.1 | 7.3 ± 1.8 |
Abbreviations: AMT: active motor threshold; APB: abductor pollicis brevis; FDI: first dorsal interosseous; iTBS: intermittent theta burst stimulation; MEP: motor evoked potential; MNS: median nerve stimulation (intensity of); MT: motor threshold; SAI: short latency afferent inhibition.
* Significant difference at adjusted p-value (p = 0.01) for multiple comparisons.