Asymmetry indexes for the gluteus medius and paraspinal muscles, as calculated by the ratio† between the left muscle/right muscle for each perturbation direction illustrated here for two different perturbation directions (backward left and backward right)
| Gluteus medius | Paraspinals | |||
|---|---|---|---|---|
| Backward left (225°) | Backward right (135°) | Backward left (225°) | Backward right (135°) | |
| *Ratios significantly different from controls. | ||||
| †A ratio closer to 1 represents more symmetrical activation of left and right muscles for a specific perturbation direction. | ||||
| Controls | 1.89 | 0.17 | 0.18 | 3.74 |
| PD-ON | 2.64 | 0.27 | 0.71* | 1.54* |