Effect of foot progression angle alteration on medial–lateral center of pressure position during single-leg standing

Abstract

[Purpose] This study aimed to investigate the effect of altering the foot progression angle (FPA) on the center of pressure (COP) position during single-leg standing. [Participants and Methods] Fifteen healthy adult males participated. The participants performed single-leg standing on the left leg in three different FPA conditions, namely toe-in, neutral, and toe-out, in which the FPA was set to 0°, 10°, and 20°, respectively. The COP positions and pelvis angles were measured using a 3D motion analysis system, and each measurement value among the three conditions was compared. [Results] The medial–lateral COP position differed among conditions in the coordinate system based on the laboratory condition but did not differ in the coordinate system based on the longitudinal axis of the foot segment. Moreover, no changes were observed in pelvis angles that would affect COP position. [Conclusion] Altering the FPA does not change the medial–lateral position of the COP during single-leg standing. Here we show that COP displacement based on the laboratory coordinate system is involved in the mechanism-linking alteration of FPA and changes in knee adduction moment.

Relationship between Soccer Shooting Speed and Trunk Angles in the Frontal Plane during One-Leg Drop Landing and Standing Hip Abduction Tasks

“…11 To maintain body balance, the trunk leans away from the abducted leg; this movement would depend on muscle strength of the supporting leg. 12 When the trunk leans toward the supporting leg, the abducted leg can move more efficiently. Measurement of the trunk angle in the frontal plane during standing hip abduction should provide useful information regarding the trunk position required for efficient movement of the non-supporting leg.…”