Background: Few comparative studies have been conducted on strengthening the anterior and posterior muscles of the trunk via lumbar stabilization exercises.
Objectives: To compare the effects of forward leaning exercise and supine bridging exercise in stability exercise.
Design: Randomized controlled clinical trial (single blind).
Methods: Thirty subjects with spondylolisthesis were participated in this study. Fifteen subjects performed the bridging exercises and fifteen subjects performed the forward leaning exercises. Each exercise was held for ten seconds per repetition, and four repetitions were considered one sub-session. A total of four sub-sessions were performed in one full exercise session. The full exercise session required thirty minutes, including rest time. Trunk strength and range of motion and Oswestry disability index were measured.
Results: Two weeks later, trunk flexion strength and trunk extension range of motion were significantly increased in the forward leaning exercise group than in the supine bridging group, trunk extension strength were significantly increased in the supine bridging exercise group than in the forward leaning group. After two weeks, the pain score was significantly lower in the forward leaning exercise group than in the supine bridging group.
Conclusion: This study has shown that stabilization exercises are effective in increasing range of motion and strength in spondylolisthesis subjects. It was especially confirmed that the method of strengthening the anterior muscles of the trunk is more effective than the standard stabilization exercise method.

INTRODUCTION
SUBJECTS AND METHODS
    Subjects
    Exercise methods
    Pain measurement
    Trunk strengthening measurement
    Trunk range of motion measurement
    Statistical analysis
RESULTS
    General characteristics of the subjects
    flexion strength
    extension strength
    flexion range of motion
    extension range of motion
    Oswestry disability index
DISCUSSION
CONCLUSION
    Funding
REFERENCES

• Chihwan Kim(Department of Physical Therapy, Jaseng Hospital of Korean Medicine)
• Sunghak Cho(Department of Physical Therapy, Kaya University) Corresponding author