The activation amplitudes of the anterior muscle sites were lower for participants with LBP, whereas the posterior sites were activated to higher amplitudes than in the control group. Although most muscles responded to the subphases indicating muscle synergies, the group by muscle interactions for the right internal oblique and lateral erector spinae show that the differences between groups were not systematic. These results describe neuromuscular alterations in persons between 50-80 years with LBP that can be used for developing subject-specific management related to maintaining spinal stability.

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Both groups were able to minimize lumbopelvic motion and recruited their abdominal muscles to similar overall amplitudes, with the IO muscle activated to higher amplitudes early in the movement task. The older adult group demonstrated a distinctive drop in abdominal activity during the leg-lowering phase of the exercise and less symmetry among muscle sites.