Time series components of the kinematic and kinetic data used in the threshold-based algorithm. (a) Evolution of the linear velocity of the C7 LED; the dotted line represent the threshold (2 SD of the quiet sitting) and the dashed line represent the first time marker that satisfied the condition. (b) Evolution of the vertical force under the trailing hand; the dotted line represent the 5% threshold and the dashed line the second time marker. (c) Time series of the vertical force underneath the initial seat; the dotted line the 5% threshold and the dashed line the third time marker. (d) Evolution of the vertical force under the target seat; the upper dotted line represent the 5% threshold whereas the two lower dotted line represent the mean ± 2 SD of the vertical force during the post-lift phase. Both fourth and fifth time markers are displayed (dashed lines).