Activities of the hip muscles during hip abduction in flexion

Abstract

We analyzed the activities of the hip muscles during hip abduction in flexion. The subjects were 15 adult males, and the evaluated muscles were the tensor fasciae latae,gluteus maximus, gluteus medius, and sartorius muscles. Integrated electromyograms during hip abduction in flexion normalized by those during maximum force exertion of each muscle were used as a parameter of muscle activity during hip abductioninflexion. The activity of each muscle during hip abduction in flexion with maximum efforts was from about half to similar to that during maximum muscle force exertion. Analysis of the association between muscle strength during hip abduction in flexion and muscle activity showed that the activity of each muscle increased with muscle strength during hip abduction in flexion. These results suggest that the tensor fasciae latae, gluteus maximus, gluteus medius, and sartorius muscles are involved in muscle strength during hip abduction in flexion, and muscle strength during hip abduction in flexion can be a parameter of the sum strength of the hip muscles.