Table 4.
A comparison of surface EMG and flexion ROM measures between chronic low back pain and pain-free control subjects
| Measure | CLBP Subjects (N= 218) |
Control Subjects (N= 30) |
significance |
|---|---|---|---|
| Flexion-Relaxation Ratios | |||
| EXT/MVF (mean, SD) Range | 38.7 (28.7) 1.6–91.9 | 3.9 (2.4) 1.3–13.2 | <0.001 |
| FLEX/MVF (mean, SD) Range | 5.2 (6.8) 0.9–40.6 | 15.1 (7.7) 5.1–38.5 | <0.001 |
| FLEX/EXT (mean, SD) Range | 0.70 (0.20) 0.3–1.4 | 0.47 (0.15) 0.2–0.9 | <0.001 |
| STAND/MVF (mean, SD) Range | 1.5 (2.3) 0.1–15.3 | 2.6 (1.6) 0.9–6.0 | 0.007 |
| Absolute SEMG (µV) | |||
| MVF SEMG (mean, SD) Range | 12.2 (9.7) 0.8–44.6 | 2.0 (0.6) 0.8–3.4 | <0.001 |
| FR achieved (µV ≤3.5)* (n, %) | 29% (n = 63) | 100% (n = 30) | <0.001 |
| Pre-flexion (mean, SD) Range | 7.0 (4.6) 1.2–26.0 | 4.9 (3.3) 1.8–16.8 | 0.014 |
| Post-flexion/Recovery (mean, SD) Range | 9.4 (5.7) 1.4–28.9 | 6.6 (4.8) 1.4–21.4 | 0.011 |
| Flexion Range of Motion (degrees) | |||
| Gross ROM (mean, SD) Range | 71.7 (24.2) 10–143 | 110 (11.7) 77–130 | <0.001 |
| Pelvic ROM (mean, SD) Range | 32.6 (16.7) 2–92 | 6 (10) 36–75 | <0.001 |
| True lumbar ROM (mean, SD) Range | 39.1 (12.9) 3–65 | 53.9 (8.2) 38–70 | <0.001 |