Influence of Different Arm External Loads on Kinematics of Scapular and Trunk during Arm Elevation

UEDA Yasuyuki, URABE Yukio, YAMANAKA Yuki, MIYAZATO Miyuki, NOMURA Shinji

doi:10.1589/rika.24.323

[Purpose] The purpose of this study was to investigate the influence of the magnitude of external loads on the arm on the orientation of the scapula and trunk during arm elevation in the scapular plane. [Subjects] Fifteen healthy subjects participated in this study. [Methods] We measured the angle of scapular upward rotation, scapular posterior tilt, thoracic extension, lumbar extension and pelvic anterior tilt with four levels of external loads (0 kg, 2 kg, 4 kg, 6 kg) at 0, 30, 60, 90, 120, 150 degrees of arm elevation and maximum arm elevation. Kinematic data were collected using four digital video cameras. [Results] With 6 kg at 150° and maximum elevation, scapular upward rotation was greater than in the normal condition. We observed significant increases of thoracic extension with 4 kg and 6 kg at 60° and 90°, and significant differences between 2-6 kg loads and the normal condition over 120°. [Conclusion] The results suggest that the magnitude of the arm external load affects scapular upward rotation and thoracic extension.<br>

Influence of Different Arm External Loads on Kinematics of Scapular and Trunk during Arm Elevation

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