Sit-to-stand movement pattern. A kinematic study.

A visual model of the sit-to-stand movement pattern was developed from the film data of 38 women and 17 men as they assumed standing from a seated position. We used the data from these film records to identify a representative initial starting position and displacements of body segments for each of 20 equal intervals throughout the movement cycle. Trajectories of data points on the head, acromion, midiliac crest, hip, and knee also were plotted. These diagrams demonstrate the time-space relationships of various body parts during the task. This normalized model may be used by physical therapists as a standard to which they can compare the movement pattern of a patient.