[Purpose] This study aims to examine the effects of the extension of the fingers (distal
upper limb) on the activity of the shoulder muscles (proximal upper limb). [Subjects and
Methods] This study involved 14 healthy male adults with no musculoskeletal disorder or
pain related to the shoulders and hands. The subjects in a sitting posture abducted the
angle of the shoulder joints at 60° and had their palms in the front direction.
Electromyography (EMG) was comparatively analyzed to look at the activities of the
infraspinatus (IS) and rhomboid major (RM) when the fingers were extended and relaxed.
[Results] The activity of the IS was statistically significantly higher when the fingers
were extended than when they were relaxed. [Conclusion] According to the result of this
study, finger extension is considered to affect the muscles for connected shoulder joint
stability.
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