Hallux and fifth toe control on body sway during single-leg standing

Abstract

The purpose of this study was to investigate the control of body sway by the hallux and fifth toe during single leg standing. Twenty four healthy women participated in this study. Toe load signal (LS) of hallux and fifth toe and center of pressure signal (COPS) were obtained simultaneously at 100Hz during single leg standing. Acceleration signal (AS) was obtained from the second derivative of COPS. The lag time from AS to LS was obtained by the cross-correlation analysis and the relationship between the lag time and the peak value was analyzed. Results showed that the acceleration of lateral direction occurred after the hallux load initiation and that the acceleration of medial direction occurred after fifth toe load initiation. The results indicated that the hallux and the fifth toe contributed to control the body sway in medial-lateral direction.