Biomechanical Sit-to-Stand Model
Interactive 4-Phase Kinematic Analysis & Center of Mass (COM) Tracking
Sit-to-Stand Kinematics
Drag the slider below to explore the transitions across all four kinematic phases.
1.00
Phase 1: Flexion
Phase 2: Transfer
Phase 3: Extension
Phase 4: Stand
Phase 1: Flexion Momentum
Hips and knees are at ~90 degrees of flexion. The trunk begins to lean forward, driven concentrically by hip flexors while spinal extensors act eccentrically to control the descent of the torso. The Center of Mass (red dot) moves horizontally forward.