Table 1. Mean (SD) Initial Position, Force and EMG Prior to the Warning and Movement Cues.
| Measure | 100-ms Epoch | Condition |
|||
|---|---|---|---|---|---|
| NoPain1 | Pain | NoPain2 | Significance | ||
| Hip Angle (deg) |
Before Warning | 106.6 (3.5) | 106.4 (3.5) | 106.5 (3.6) | NS |
| Before Movement | 106.6 (3.5) | 106.4 (3.5) | 106.5 (3.6) | ||
| Knee Angle (deg) |
Before Warning | 94.9 (4.1) | 95.1 (4.2) | 95.0 (4.3) | NS |
| Before Movement | 94.9 (4.1) | 95.1 (4.2) | 95.0 (4.3) | ||
| Ankle Angle (deg) |
Before Warning | 112.7 (4.7) | 112.4 (4.8) | 112.4 (5.0) | NS |
| Before Movement | 112.7 (4.8) | 112.4 (4.8) | 112.4 (5.0) | ||
| Anterior CoP Under Feet (cm) |
Before Warning | 10.6 (3.0) | 10.6 (3.0) | 10.7 (3.0) | NS |
| Before Movement | 10.6 (3.0) | 10.6 (3.0) | 10.7 (3.0) | ||
| Anterior CoP Under Seat (cm) |
Before Warning | 20.9 (1.9) | 20.7 (1.8) | 20.7 (1.7) | NS |
| Before Movement | 20.9 (2.0) | 20.7 (1.8) | 20.7 (1.7) | ||
| Feet Vertical Force (% wgt) |
Before Warning | 13.9 (1.6) | 14.3 (1.5) | 14.5 (1.7) | P < 0.000005 |
| Before Movement | 13.8 (1.6) | 14.2 (1.5) | 14.4 (1.7) | ||
| Seat Vertical Force (% wgt) |
Before Warning | 86.6 (2.8) | 86.0 (2.8) | 86.0 (3.1) | P < 0.05 |
| Before Movement | 86.7 (2.8) | 86.1 (2.8) | 86.0 (3.1) | ||
| Rectus Abdom. (uV*s) |
Before Warning | 97 (21) | 107 (17) | 94 (10) | NS |
| Before Movement | 97 (21) | 108 (15) | 97 (13) | ||
| Internal Oblique (uV*s) |
Before Warning | 269 (218) | 264 (186) | 243 (186) | NS |
| Before Movement | 275 (237) | 261 (180) | 246 (212) | ||
| Erector Spinae (uV*s) |
Before Warning | 623 (376) | 687 (429) | 771 (559) | NS |
| Before Movement | 622 (409) | 680 (458) | 731 (545) | ||
| Rectus Femoris (uV*s) |
Before Warning | 97 (28) | 118 (33) | 92 (20) | P < 0.0005 |
| Before Movement | 100 (38) | 122 (37) | 93 (21) | ||
| Biceps Femoris (uV*s) |
Before Warning | 83 (15) | 108 (27) | 85 (13) | P < 0.0005 |
| Before Movement | 83 (16) | 107 (28) | 84 (14) | ||
| Tibialis Anterior (uV*s) |
Before Warning | 231 (277) | 152 (115) | 107 (38) | NS |
| Before Movement | 248 (305) | 170 (162) | 119 (49) | ||
| Gastrocnemius Medialis (uV*s) |
Before Warning | 86 (13) | 107 (27) | 86 (15) | P < 0.005 |
| Before Movement | 88 (15) | 107 (29) | 88 (13) | ||
NS - not significant (P > 0.05); wgt – weight; abdom – abdominus