Figure 1From: Combined effects of age and gender on gait symmetry and regularity assessed by autocorrelation of trunk accelerationSignals for vertical acceleration and their autocorrelation. The vertical accelerations signal (upper line) shows a periodic fluctuation in accordance with the step cycle. The autocorrelation function (lower line) also indicates a periodic fluctuation with the same period. The values of each peak (Ad1 and Ad2) provided indices of symmetry and regularity, respectively.Back to article page