Table 2. Intragroup correlations between motor reaction time and body structure, function, personal factors, and functional skills according to sarcopenia status.
| Non-sarcopenic | Pre-sarcopenic | Sarcopenic | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MRT | TRTS | TRTF | MRT | TRTS | TRTF | MRT | TRTS | TRTF | |
| Body structure and function | |||||||||
| Muscle (%/kg) | -0.235 | -0.199 | -0.684 | -0.350 | -0.891 | -0.251 | - | - | - |
| Fat (%/kg) | - | - | - | -0.606 | 0.644 | 0.360 | - | - | - |
| Muscle strength (kg/f) | -0.777 | -0.611 | -0.719 | -0.325 | -0.541 | 0.275 | - | - | - |
| 30-Second Sit to Stand (repetitions) | -0.565 | -0.337 | -0.756 | -0.851 | -0.820 | 0.165 | - | - | - |
| Personal factor | |||||||||
| FES-I (score) | 0.743 | 0.319 | 0.643 | 0.621 | 0.900 | 0.034 | - | - | - |
| Functional skills | |||||||||
| TUG (seconds) | 0.991 | 0.904 | 0.112 | 0.722 | 0.763 | 0.361 | 0.408 | 0.032 | 0.765 |
| 4-Stage Balance test (score) | -0.728 | -0.968 | -0.352 | -0.220 | -0.143 | -0.901 | 0.532 | 0.231 | 0.482 |
| Gait speed (m/s) | -0.118 | -0.526 | -0.975 | -0.355 | -0.142 | -0.490 | -0.496 | -0.050 | -0.584 |
| Step length (m) | -0.988 | -0.977 | -0.352 | -0.620 | -0.054 | -0.548 | -0.675 | -0.509 | -0.238 |
Pearson correlation test, considering significant p<0.05, weak correlations with r<0.3, moderate correlations with r=0.3 to 0.6, and strong correlations with r >0.6.
A: non-sarcopenic; B: pre-sarcopenic; C: sarcopenic; FES-I: Falls Efficacy Scale International; HGS: handgrip strength; MRT: motor reaction time; TRTS: simple motor reaction time; TRTF: motor reaction time with fatigue; TUG: Timed Up and Go test; - the absence of significant correlation (p≤0.05).