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Purpose: This study was conducted to evaluate the effects of bridge exercise on the structural characteristics of trunk muscles in patients with lumbar pain by applying the exercise on either a stable or an unstable surface. Methods: Thirty subjects participated in the experiment and were randomly divided into an unstable bridge exercise group (UBEG) and a stable bridge exercise group (SBEG). The exercise program for each group was conducted three times a week over a six-week period. The structural characteristics of trunk muscles were measured by obtaining images using an ultrasound imaging device. Results: The thicknesses of the external oblique (EO), internal oblique (IO), and transverse abdominis (TrA) and the fiber angle of the erector spinae (ES) in the UBEG and the SBEG showed statistically significant increases in all items measured after the experiment. A comparison of groups conducted after the experiment to determine the effects of the exercise on each group showed no significant differences between groups for any of the measured items. Conclusion: A comprehensive review of the study results showed statistically significant increases in the thicknesses of the EO, IO, and TrA and the fiber angle of ES in both the UBEG and the SBEG. While the comparison of the groups with respect to the effects of the exercise revealed no significant differences, there were relatively larger effects in the UBEG than in the SBEG.

Effects of Stabilization Exercise on the Structural Characteristics of Trunk Muscles between Stable and Unstable Surfaces