Table 4.
Comparison of intraclass correlation coefficients for back extensor musculature between groups.
| %HAT | Left ULES |
Right ULES |
Left LLES |
Right LLES |
Left BF |
Right BF |
Mean | p | |
|---|---|---|---|---|---|---|---|---|---|
| 100 | Control | .80 | .88 | .94 | .93 | .94 | .91 | .90 | .037* |
| LBP | .74 | .88 | .85 | .81 | .72 | .88 | .81 | ||
| 110 | Control | .81 | .74 | .92 | .90 | .95 | .93 | .88 | .044* |
| LBP | .60 | .79 | .75 | .72 | .83 | .86 | .76 | ||
| 120 | Control | .88 | .93 | .97 | .95 | .98 | .96 | .95 | .005* |
| LBP | .57 | .80 | .73 | .74 | .88 | .88 | .77 | ||
| 130 | Control | .85 | .91 | .96 | .94 | .98 | .93 | .93 | .008* |
| LBP | .37 | .71 | .63 | .68 | .86 | .84 | .68 | ||
| 140 | Control | .89 | .92 | .96 | .94 | .98 | .95 | .94 | .006* |
| LBP | .46 | .72 | .57 | .64 | .89 | .88 | .69 | ||
| 150 | Control | .89 | .92 | .97 | .94 | .98 | .97 | .95 | .011* |
| LBP | .03 | .61 | .33 | .44 | .88 | .86 | .53 | ||
| 160 | Control | .87 | .90 | .90 | .87 | .98 | .80 | .89 | .019* |
| LBP | .21 | .67 | .67 | .62 | .66 | .90 | .62 | ||
| 170 | Control | .84 | .90 | .95 | .91 | .98 | .95 | .92 | .025* |
| LBP | .45 | .31 | .67 | .65 | .92 | .92 | .65 | ||
| MVIA | Control | .92 | .96 | .96 | .93 | .99 | .96 | .95 | .021* |
| LBP | .36 | .52 | .72 | .72 | .93 | .94 | .70 | ||
| p | < .0001† | .002† | < .0001† | < .0001† | .001† | .043† |
HAT: head, arms, trunk segment. LBP: Low back pain. ULES: Upper lumbar erector spinae. LLES: Lower lumbar erector spinae. BF: biceps femoris
* p ≤ 0.05 between LBP and Controls Groups for each % HAT.
† p ≤ 0.05 between LBP and Controls Groups for the specific muscle group in that column.