Comparison of the scapulohumeral rhythm of the young and elderly

Abstract

[Purpose] The purpose of this study was to describe the scapulohumeral rhythm of young and elderly subjects during shoulder abduction in order to elucidate the effects of aging. [Subjects and Methods] The subjects were 21 young and 17 elderly males. Shoulder abduction was measured using a three-dimensional motion analysis system. We conducted three-dimensional kinematic measurements of the scapula. [Results] The average overall scapulohumeral rhythm was 3.5:1 in the young, and 4.4:1 in the elderly. [Conclusion] The present study determined the difference due to aging in scapulohumeral rhythm. The results of this study provide important knowledge that can be used in the field of physiotherapy.