Analysis of Joint Motion during Sitting Up from the Supine Position

Abstract

[Purpose] The purpose of this study was to clarify the motions of the body joints during sitting up from the supine position. [Subjects and Methods] Ten healthy young men (ages 21–26) participated in this study. The subjects sat up from the supine position without trunk rotation. The joint motions were recorded using a three-dimensional motion analysis system (MAC3D). [Results] The head moved from a neutral position to about 50° flexion in the early phase of sitting up. The right shoulder moved in the flexion direction in the early phase of sitting up. The right hip moved slightly in the direction of extension and then moved in the direction of flexion. [Conclusion] Collecting knowledge about the motions of body joints while sitting up from the supine position might provide information about the range of motion in the joints required for sitting up from the supine position.