Table 2. Description of the hip muscles strength measurements

Strength measurements	Strap placement	Position	Procedure	Figure
Hip extensor	Distal thigh	Prone	The examiner controlled the subject’s lumbopelvic rotation during hip extension (HE).Subjects performed HE against a strap to maximal voluntary isometric contraction (MVIC) twice.
Hip abductor	Ankle	Supine	The examiner controlled the subject’s lumbopelvic side-bending during hip abduction. The hip and knee joint of the dominant leg was extended to 0°. Subjects performed hip abduction against a strap to MVIC twice.
Hip adductor	Ankle	Supine	The examiner controlled the subject’s lumbopelvic side-bending during hip adduction. The hip and knee joint of the dominant leg was extended to 0°. Subjects performed hip adduction against a strap to MVIC twice.
Gluteal squeeze	Gluteus covers at greater trochanter level	Standing	Strap covered gluteus at greater trochanter level. When the subject actively contracts the gluteal muscle, the repulsive force occurs in tension sensor by muscle valley enlargement by the gluteal squeezing. Subjects performed gluteal squeezing against a strap to MVIC twice.