![]() ![]() As the hip abductor muscles resist possible injurious motions, such as dynamic knee valgus resulting from excessive hip adduction and internal rotation, improvement of hip abductor muscle strength and activation may be a critical aspect of rehabilitation and injury prevention programs. Weakness of the gluteus medius and maximus may contribute to lower extremity injury by influencing joint-loading patterns and lower extremity control. ![]() Hip abductor muscle weakness has been associated with several lower extremity injuries, including patellofemoral pain syndrome, iliotibial band friction syndrome, anterior cruciate ligament sprains, and chronic ankle instability. These muscles build a powerful triangular ensemble spanning between the anterior superior iliac spine, the posterior superior iliac spine, and the greater trochanter region of the femur. They are considered one of the primary stabilizers in the pelvic region. The hip abductor muscles play an important role in maintaining normal movement patterns of the pelvis and lower extremities. Hip Abductor Muscles, Transverse Relaxation Times, Muscle Activity, Side-Lying Hip Abduction, Magnetic Resonance Imaging In contrast, the posterior segments of the gluteus medius and upper fiber of the gluteus maximus were significantly increased with side-lying abduction with external rotation and extension compared to that during other tasks.Ĭonclusions: The results suggest that side-lying hip abduction exercise with different directions influences the difference in muscle activity between hip abductor muscles and reflects differences in the function of the hip abductor muscles. The anterior segment of the gluteus medius was significantly increased with side-lying abduction with internal rotation and flexion compared to that with side-lying abduction with external rotation and extension. Results: The T2 values of all muscles, excluding the upper fiber of the gluteus maximus, significantly increased after exercise with all motor tasks over time. ![]() ![]() The two-way repeated measures analysis of variance analysis was used to determine differences between the groups over time. Methods: The T2 values measured using magnetic resonance imaging were used to quantify the activity level of the hip abductor muscles in 10 healthy young males during side-lying hip abduction with different directions (neutral hip, internal rotation and flexion, external rotation, and extension). Objectives: To measure the T2 values of hip abductor muscles during side-lying hip abduction exercises in different directions using magnetic resonance imaging and to clarify variations in the activity of each segment of the gluteus medius, upper fiber of the gluteus maximus, gluteus minimus, and tensor fasciae latae. In addition, previous studies have not quantified the activity of hip abductor muscles during side-lying hip abduction exercises in different directions. Side-lying hip abduction exercises to strengthen the hip abductor muscles is frequently used in rehabilitation and injury prevention programs without scientific evidence regarding their ability to activate the targeted muscles. Study Design: Controlled laboratory cross-sectional study.īackground: Hip abductor muscle weakness is associated with various lower extremity injuries. ![]()
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