| Description |
This study evaluated electromyographic muscle activity during a select pelvic repositioning exercise. It was hypothesized that the prescribed exercise would demonstrate significant activation in the left semitendinosus, right rectus femoris, and bilateral obliques, while maintaining the right semitendinosus and left rectus femoris in a relatively inactive state. Twenty-three Healthy college students (13 females, 10 males) between the ages of 18 and 25 years completed 3 sets of the 90-90 Supported Hip Lift with Hemibridge exercise while connected to surface electromyography. Muscle activation of bilateral rectus femoris, semitendinosus, and oblique muscles was analyzed. The average seconds (s) of muscle activity during exercise performance were as follows: right rectus femoris x̅ = 9.24s (SD = 4.8s), left rectus femoris x̅ = .89s (SD = 1.63s), right semitendinosus x̅ = .07s (SD = .28s), left semitendinosus x̅ = 9.0s (SD = 5.13s), right oblique x̅ = 1.03 (SD = 1.90s), left oblique x̅ = .53s (SD = .84s). Statistically significant muscle activation of the right rectus femoris compared to the left (p = .02) and left semitendinosus compared to the right (p = .00) was demonstrated. Difference between right and left Oblique activity was not significant (p = .10). This study validates the muscle activity during 90-90 Supported Hip Lift with Hemibridge exercise, demonstrating its effectiveness in activating the left semitendinosus and right rectus femoris muscles while maintaining relative inactivity of contralateral rectus femoris and semitendinosus muscles. These results suggest that the exercise may be an effective tool iv for activating the left semitendinosus and right rectus femoris while simultaneously maintaining relative inactivity of the right semitendinosus and left rectus femoris muscles. |
