Table 3 Mean (SD) RMS amplitudes normalized to a maximal effort contraction (%MVIC) for the total exercise for level 1 and for the leg extension phase of levels 2 and 3.
| Â | Â | Abdominal Muscles | Â | Back Extensor Muscles | ||
|---|---|---|---|---|---|---|
| Â | Â | Right | Left | Â | Right | Left |
Level 1 Total Exercise | LRA | 15.6 (± 6.6) | 15.6 (± 5.4) | L1–3 | 6.1 (± 2.2) | 5.7 (± 1.8) |
|  | URA | 16.4 (± 10.3) | 14.5 (± 6.5) | L1–6 | 8.1 (± 2.5) | 8.1 (± 2.7) |
|  | EO1 | 22.5 (± 13.4) | 21.6 (± 6.8) | L3-3 | 5.2 (± 1.2) | 4.6 (± 1.4) |
|  | EO2 | 20.7 (± 10.5) | 20.0 (± 12.9) | L3–6 | 5.4 (± 2.1) | 5.3 (± 1.7) |
|  | EO3 | 24.9 (± 9.1) | 21.5 (± 9.2) | L4–8 | 8.2 (± 2.3) | 7.5 (± 3.7) |
|  | IO | 22.4 (± 14.1) | 22.4 (± 9.4) | L5-2 | 7.2 (± 2.7) | 7.1 (± 2.6) |
Level 2 Leg Extend | LRA | 18.4 (± 7.4) | 17.2 (± 5.2) | L1–3 | 5.2 (± 1.9) | 5.3 (± 1.6) |
|  | URA | 17.4 (± 8. 6) | 16.5 (± 7.2) | L1–6 | 6.6 (± 1.8) | 8.1 (± 3.2) |
|  | EO1 | 25.0 (± 10.5) | 21.0 (± 9.1) | L3-3 | 4.9 (± 1.8) | 5.2 (± 2.7) |
|  | EO2 | 22.7 (± 10.6) | 19.8 (± 10.9) | L3–6 | 4.9 (± 2.4) | 6. 6 (± 3.2) |
|  | EO3 | 27.6 (± 8.5) | 22.9 (± 9.2) | L4–8 | 7.0 (± 2.3) | 8.8 (± 4.1) |
|  | IO | 23.4 (± 13.7) | 20.6 (± 6.6) | L5-2 | 7.0 (± 3.0) | 7.2 (± 2.7) |
Level 3 Leg Extend | LRA | 25.4 (± 12.5) | 23.2 (± 9.5) | L1–3 | 5.5 (± 2.4) | 5.5 (± 2.1) |
|  | URA | 24.9 (± 14.4) | 23.4 (± 13.2) | L1–6 | 7.0 (± 2.0) | 8.6 (± 3.9) |
|  | EO1 | 33.3 (± 13.0) | 28.5 (± 15.2) | L3-3 | 5.1 (± 2.0) | 5.4 (± 3.1) |
|  | EO2 | 27.3 (± 11.1) | 26.8 (± 19.9) | L3–6 | 5.0 (± 2.1) | 7.0 (± 3.6) |
|  | EO3 | 33.8 (± 9.9) | 30.4 (± 17.9) | L4–8 | 7.5 (± 2.9) | 9.5 (± 4.5) |
|  | IO | 27.3 (± 13.8) | 23.9 (± 9.2) | L5-2 | 7.1 (± 3.4) | 7.4 (± 3.1) |