Background: Muscle activities of gluteus maximus (GM) and hamstring (HAM) have important roles in the stability and mobility of the hip joint during various functional activities including bridge and prone hip extension exercises.
Objects: The purpose of this study is to investigate muscle activities of GM, multifidus (MF) and HAM during three different bridge exercises in healthy individuals.
Methods: Twenty healthy subjects were participated. Electromyography device was used to measure muscle activities of GM, MF and HAM. Each subject was asked to perform three different bridge exercises with hip abduction (0°, 15°, 30°) in random order. One-way repeated measures analysis of the variance and a Bonferroni post hoc test were used. Statistical significance was set at α = 0.01.
Results: The muscle activity of GM was significantly different among three conditions (hip abduction 0°, 15°, 30°) (adjusted p-value [Padj] < 0.01). The muscle activity of GM was significantly greater during bridge exercise with hip abduction 30° compared to 0° and 15° (Padj < 0.01). There was no significant difference in the muscle activity of MF and HAM muscle (Padj > 0.01). The ratio of muscle activity (ratio = GM/HAM) during bridge exercise with hip abduction 30° was significant greater compared to the hip abduction angles 0° and 15° (Padj < 0.01).
Conclusion: Bridge exercise with hip abduction 30° can be recommended to selectively facilitate the muscle activity of GM and improve the ratio of muscle activity between GM and HAM.

INTRODUCTION
MATERIALS AND METHODS
    1. 연구대상
    2. 측정방법 및 도구
    3. 실험 절차
    4. 자료 분석
RESULTS
    1. 근활성도
    2. 근활성도 비율
DISCUSSION
CONCLUSIONS
REFERENCES

• 최지석(호서대학교 생명보건대학 물리치료학과,호서대학교 스마트 헬스케어 융복합 연구센터) | Ji-Seok Choi (Department of Physical Therapy, College of Life and Health Science, Hoseo University, Smart Healthcare Convergence Research Center, Hoseo University, Asan, Korea)
• 장태진(호서대학교 생명보건대학 물리치료학과, 호서대학교 스마트 헬스케어 융복합 연구센터) | Tae-Jin Jang (Department of Physical Therapy, College of Life and Health Science, Hoseo University, Smart Healthcare Convergence Research Center, Hoseo University, Asan, Korea)
• 전인철(호서대학교 생명보건대학 물리치료학과, 호서대학교 스마트 헬스케어 융복합 연구센터) | In-Cheol Jeon (Department of Physical Therapy, College of Life and Health Science, Hoseo University, Smart Healthcare Convergence Research Center, Hoseo University, Asan, Korea) Corresponding author