Table 2.
Intratester Reliability of the measurement of Area of the Transverse Abdominis muscle at three Lumbar levels at rest and during the hollowing maneuver
| Resting | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Right Mean (SD) cm2 | Left Mean (SD) cm2 | ICC (95% CI) | SEM (95% CI for muscle size) | % SEM | Minimal Difference (cm2) | |||||
| Level | Right | Left | Right | Left | Right | Left | Right | Left | ||
| L1 | 2.51 (0.68) | 2.76 (0.88) |
0.980 (0.956–0.992) |
0.979 (0.953–0.993) |
0.096 (2.32, 2.70) |
0.127 (2.51, 3.01) |
3.825 | 4.601 | 0.265 | 0.353 |
| L3 | 2.27 (0.64) | 2.46 (0.79) |
0.965 (0.921–0.987) |
0.990 (0.979–0.996) |
0.119 (2.04, 2.50) |
0.079 (2.31, 2.62) |
5.242 | 3.211 | 0.330 | 0.220 |
| L5 | 1.97 (0.42) | 2.04 (0.76) |
0.962 (0.916–0.986) |
0.985 (0.967–0.994) |
0.083 (1.80, 2.13) |
0.094 (1.86, 2.23) |
4.213 | 4.608 | 0.230 | 0.260 |
| Average value (SD) | 2.34 (0.70) | 0.98 (0.01) | 0.10 (0.02) | 4.28 (0.71) | 0.28 (0.05) | |||||
| Hollowing | ||||||||||
| Right Mean (SD) cm2 | Left Mean (SD) cm2 | ICC (95% CI) | SEM (95% CI for muscle size) | %SEM | Minimal Difference (cm2) | |||||
| Level | Right | Left | Right | Left | Right | Left | Right | Left | ||
| L1 | 2.46 (0.72) | 3.02 (1.15) |
0.978 (2.33–2.54) |
0.977 (0.950–0.991) |
0.106 (2.25, 2.66) |
0.175 (2.68, 3.36) |
4.711 | 5.795 | 0.295 | 0.484 |
| L3 | 2.32 (0.58) | 2.49 (0.91) |
0.970 (0.933–0.989) |
0.993 (0.984–0.997) |
0.101 (2.12, 2.52) |
0.076 (2.34, 2.64) |
4.353 | 3.057 | 0.281 | 0.211 |
| L5 | 1.84 (0.60) | 2.36 (1.22) |
0.991 (0.980–0.997) |
0.989 (0.977–0.996) |
0.057 (1.73, 1.96) |
0.128 (2.11, 2.61) |
3.098 | 5.424 | 0.158 | 0.355 |
| Average value (SD) | 2.41 (0.86) | 0.98 (0.01) | 0.11 (0.04) | 4.41 (1.50) | 0.30 (0.11) | |||||