Table 3.
Intratester Reliability of the measurement of Length of the Transverse Abdominis muscle at three Lumbar levels at rest and during the hollowing maneuver
| Resting | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Right Mean (SD) cm | Left Mean (SD) cm | Resting ICC (95% CI) | Resting SEM (95% CI for muscle size) | Resting % SEM | Resting Minimal Difference (cm) | |||||
| Level | Right | Left | Right | Left | Right | Left | Right | Left | ||
| L1 | 6.78 (1.61) | 7.31 (1.30) |
0.990 (0.978–0.996) |
0.986 (0.970–0.995) |
0.161 (6.47, 7.10) |
0.154 (7.00, 7.61) |
2.376 | 2.107 | 0.447 | 0.427 |
| L3 | 6.52 (1.69) | 6.66 (1.63) |
0.982 (0.960–0.993) |
0.978 (0.952–0.992) |
0.228 (6.07, 6.96) |
0.241 (6.19, 7.13) |
3.50 | 3.619 | 0.631 | 0.669 |
| L5 | 6.08 (1.60) | 6.37 (1.41) |
0.988 (0.974–0.996) |
0.970 (0.932–0.989) |
0.175 (5.73, 6.42) |
0.244 (6.19, 7.13) |
2.878 | 3.830 | 0.486 | 0.677 |
| Average value (SD) | 6.62 (1.54) | 0.98 (0.01) | 0.20 (0.042) | 3.05 (0.71) | 0.56 (0.12) | |||||
| Hollowing | ||||||||||
| Right Mean (SD) cm | Left Mean (SD) cm | ICC (95% CI) | SEM (95% CI for muscle size) | %SEM | Minimal Difference (cm) | |||||
| Level | Right | Left | Right | Left | Right | Left | Right | Left | ||
| L1 | 5.18 (1.44) | 5.93 (1.50) |
0.990 (0.978–0.996) |
0.980 (0.956–0.992) |
0.144 (4.90, 5.46) |
0.211 (5.51, 6.34) |
2.939 | 3.558 | 0.398 | 0.586 |
| L3 | 5.01 (1.24) | 4.88 (1.09) |
0.976 (0.947–0.991) |
0.971 (0.936–0.989) |
0.173 (4.67, 5.35) |
0.185 (4.52, 5.25) |
3.45 | 3.791 | 0.480 | 0.514 |
| L5 | 4.36 (1.35) | 4.50 (1.03) |
0.983 (0.963–0.994) |
0.977 (0.949–0.991) |
0.175 (4.02, 4.71) |
0.157 (4.20, 4.81) |
4.014 | 3.489 | 0.486 | 0.435 |
| Average value (SD) | 4.98 (1.28) | 0.98 (0.01) | 0.17 (0.023) | 3.54 (0.36) | 0.48 (0. 06) | |||||