Temporal Optimality of a Via-Posture on Trajectory during Sit-to-Stand and Back-to-Sit Movements

Abstract

The purpose of this study was to examine the hypothesis that the minimum angle-jerk with viapoint model could account for the temporal consistency of kinematics in sit-to-stand (STS) and back-to-sit (BTS) movements. The positions of bony landmarks on the subjects during the tasks were recorded using a Vicon motion analysis system to yield the angular displacement and position of the center of mass (COM) of a three-link rigid body model in the sagittal plane. Minimum angle-jerk and minimum jerk trajectories with a via-point were computed for joint angle and COM, respectively. Five to six candidate points were selected as the via-point from the measured trajectory based on the separate kinematic events. The results show the optimal angular trajectories using the via-points (via-angles) before the seat-off for STS, and at around the seat-contact for BTS resembles the measured angular trajectories well, indicating that the posture at the via-point was temporally optimal to produce the minimum angle-jerk trajectory for both movements. It is hypothesized that the multi-joint angular patterns during STS and BTS movements were organized to pass through the via-point, namely the via-posture along the minimum angle-jerk trajectory.

Effect of body mass index and chair height on the torque developed at the knee joint during back-to-sit and sit-to-stand movements

“…In human daily routine life, back-to-sit (BTS) and sit-to-stand (STS) movements are unavoidable. These movements are possible only if a number of degrees of freedom of musculoskeletal system are coordinated both at joints and at muscles (Yamasaki et al, 2014;Demura et al, 2003). Elderly people and middle aged people have to take a greater effort to achieve an STS movement with leg muscle functional lowering a balancing function (Alexander et al, 1991).…”