Table 2.
Normalized lumbar extensor muscle surface EMG activity (in % MVIC) during dynamic exercise on a home back extension exercise device depicted by exercise load, phase of movement, and position in range of motion.
| Exercise Load | ||||||
|---|---|---|---|---|---|---|
| 1.00 BW | 1.25 BW | 1.50 BW | ||||
| Mean | SD | Mean | SD | Mean | SD | |
| Full Repetition | 34.9 | 16.0 | 42.1 | 11.8 | 47.1 | 9.8 |
| Concentric Phase: | ||||||
| Full Concentric Phase | 41.2 | 17.9 | 50.5 | 16.2 | 52.8 | 10.3 |
| Flexion Position | 33.0 | 16.1 | 36.6 | 16.6 | 37.7 | 11.3 |
| Mid Position | 40.1 | 19.9 | 50.0 | 16.3 | 50.8 | 8.7 |
| Extension Position | 50.4 | 21.9 | 65.0 | 20.7 | 69.9 | 16.0 |
| Eccentric Phase: | ||||||
| Full Eccentric Phase | 28.7 | 16.0 | 33.6 | 12.7 | 41.4 | 13.8 |
| Flexion Position | 23.3 | 14.9 | 27.4 | 12.7 | 31.2 | 13.0 |
| Mid Position | 27.3 | 16.8 | 30.4 | 13.4 | 38.5 | 12.3 |
| Extension Position | 35.3 | 18.5 | 42.9 | 14.4 | 54.7 | 27.8 |
Key: Values are in % Maximum Voluntary Isometric Contraction (MVIC), BW = Body Weight, SD = Standard Deviation.