Table 2.
Normalized EMG (nEMG) values of the 5 selected muscles during torso-twist in machine and using elastic resistance, respectively. Values are presented as least square means (LSM) and 95% confidence interval (95% CI).
| Muscle | Elastic | Machine | Mean diff. (95% CI) | P value |
|---|---|---|---|---|
| Mean (95% CI) | Mean (95% CI) | |||
| Rectus abdominis | 10 (−3 to 24) | 16 (3 to 29) | −5.6 (−20 to 9) | 0.45 |
| External obliques (left) | 54 (40 to 67) | 77 (64 to 90) | −23 (−38 to −9) | 0.0018 |
| External obliques (right) | 47 (34 to 60) | 41 (28 to 54) | 6.2 (−8 to 20) | 0.39 |
| Erector spinae (left) | 24 (10 to 37) | 18 (4 to 32) | 5.9 (−10 to 22) | 0.47 |
| Erector spinae (right) | 50 (36 to 64) | 32 (18 to 46) | 17.7 (1.6 to 34) | 0.03 |