The Multivariate Largest Lyapunov Exponent as an Age-Related Metric of Quiet Standing Balance

Figure 1

Posture of the subject and testing system. The angle sensor was positioned at the ankle, knee, and hip joints. Subjects stood barefoot on a force platform, with hands naturally at their sides. Their two feet were apart at their shoulder-width. Subjects were asked to stand upright with eyes-closed and eyes-open, respectively, for 100 s.