Influence of chair height on posture while playing the cello: a biomechanical analysis using motion capture

Abstract

Posture plays a significant role in the physical health of musicians in general, especially those who play string instruments, such as cellists, for whom the interaction between the trunk, upper limbs, and instrument support requires proper alignment. This study aims to investigate the influence of different chair heights on the posture of a cellist during the performance of a musical scale, using biomechanical analysis through motion capture. One participant who was a beginner on the instrument performed the task under four conditions: seated on the same chair adjusted to heights of 42 cm (23.1% of the participant’s height), 48 cm (26.4%), and 54 cm (29.7%), and in a near-standing position. Joint angles of the shoulder (the primary variable) were analyzed, as well as those of the pelvis and the elbow of the arm holding the bow (secondary variables). No changes in the height of the endpin were considered; that is, it was not adjusted and remained at the same setting for all participant positions. The results showed that chair height has a direct effect on shoulder flexion, with lower mean values observed at the 48 cm chair height and greater demands in the near-standing posture. Thus, within the scope and limitations of this study, it was concluded that chair height can, to some extent, alter the ideal posture of the cellist, impacting comfort, stability, and biomechanical efficiency. Furthermore, the importance of individualized furniture adjustments for musicians is emphasized.