Background: Therapeutic exercise is essential in patients with low back pain and lumbopelvic instability. Intra-abdominal pressure is necessary for ideal dynamic stabilization patterns. However, accurate performance of such exercises is a challenge. A trunk harness can help stabilize and alter muscular patterns. This study aimed to examine the effects of using a trunk harness on lumbopelvic stability and muscle activity during prone hip extension in healthy individuals and patients with low back pain. Methods: Sixteen patients with low back pain and 15 healthy individuals performed prone hip extension under control, Dynamic Neuromuscular Stabilization(DNS)-maneuver, and DNS-maneuver + harness conditions. Lumbopelvic kinematic data, muscle onset time of the bilateral erector spinae, semitendinosus, gluteus maximus, low back pain severity, and difficulty performing prone hip extension were evaluated. Repeated-measures two-way analysis of variance was performed for each measurement item. The significant level was set at 5%. Results: The lumbar lordosis angle was significantly lower in the DNS-maneuver and DNS-maneuver + harness conditions. The anterior pelvic tilt angle was significantly lower, and muscle onset of the gluteus maximus and contralateral erector spinae occurred earlier in the DNS-maneuver + harness condition. The difficulty of performing prone hip extension was significantly lower in the DNS-maneuver and DNS-maneuver + harness conditions and was considerably lower in the DNS-maneuver + harness condition than in the DNS-maneuver condition. Conclusion: Wearing a trunk harness could help stabilize the lumbopelvic region and change muscle activity patterns.



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