Category: Clinical Practice (assessment, diagnosis, treatment, knowledge translation/EBP, implementation science, program development)
Objective : To examine the effect of knee flexion and hip external rotation during bridge exercise on gluteus maximus (Gmax), gluteus medius (Gmed), and hamstring (HAM) muscles activity.
Research laboratory in Yonsei University.
Participants (or Animals, Specimens, Cadavers) :
Twenty-three healthy adults.
Interventions : Bridge exercise with four different conditions: (a) with knee flexion 90°, without hip external rotation (b) with knee flexion 90°, with hip external rotation (c) with knee flexion 135°, without hip external rotation (d) with knee flexion 135°, with hip external rotation.
Main Outcome Measure(s) :
Electromyography of Gmax, Gmed, and HAM muscle activity during bridge exercise.
There was no significant interaction effect between the degree of knee flexion and hip external rotation. There was a significant main effect for degree of knee flexion in Gmax, HAM muscles. Gmax muscle activity was significantly greater in knee flexion 135° position compared to knee flexion 90° position. HAM muscle activity was significantly less in knee flexion 135° position compared to knee flexion 90° position. A significant main effect for hip external rotation was detected in Gmax and Gmed muscles. The muscle activity of both Gmax and Gmed was significantly greater with hip external rotation than without hip external rotation.
Bridge exercise with knee flexion 135° and hip external rotation is most effective exercise for improving Gmax and Gmed muscles activity while decreasing HAM muscle activity among four different conditions.
Kyung-eun Lee– graduate school student, Yonsei University, Wonju-si, Kangwon-do
Seo-hyun Kim– graduate school student, Yonsei University, Wonju-si, Kangwon-do
Seng-min Baik– graduate school student, Yonsei University, Wonju-si, Kangwon-do
Chung-hwi Yi– Professor, Yonsei University, Wonju-si, Kangwon-do