Physical Therapy Korea
pISSN 1225-8962
eISSN 2287-982X
Physical Therapy Korea
Comparison of IF/PD muscle activity ratio by exercises and forearm positions
| Variable | SIER | STER | PRER | SLER | F | |
|---|---|---|---|---|---|---|
| IF/PD ratio | Neutral | 11.33 ± 4.06 | 3.05 ± 1.03a | 1.59 ± 0.40a,b | 3.75 ± 1.95a,c | 79.067 |
| Supinated | 10.64 ± 3.61 | 3.06 ± 1.13a | 1.66 ± 0.39a,b | 4.08 ± 2.16a,c | 65.323 |
|
| Difference | 0.69 ± 1.61 | –0.02 ± 0.49 | –0.07 ± 0.16 | –0.33 ± 0.83 | 2.531 | |
| t | 2.356 |
–0.191 | –2.212 |
–2.210 |
||
Values are presented as mean ± standard deviation. SIER, sitting external rotation at 0°abduction; STER, standing external rotation at 90°abduction; PRER, prone external rotation at 90°of abduction; SLER, side-lying external rotation at 0°abduction; IF, infraspinatus; PD, posterior deltoid. aThere is a significant difference from SIER (p < 0.05), bThere is a significant difference from STER (p < 0.05), cThere is a significant difference from PRER (p < 0.05). *p < 0.05, **p < 0.01.