Abstract
The current study investigated the possibility that certain psychosocial factors may actually have a direct impact on the basic muscular mechanics of the human at work. The psychosocial dimension chosen for this evaluation was personality type. The Jenkins Activity Survey was used to classify subjects as Type A (n=10) or Type B (n=10) individuals. Each subject participated in an EMG-based biomechanical study to investigate the coactivation patterns of the muscles that span the elbow joint. Subjects performed isometric, isokinetic (50 deg/sec) and isoacceleration (50 deg/sec/sec) elbow flexion exertions. Isometric exertions were performed at 20, 40, 60 and 80% of maximum isometric flexion torque. Dynamic exertions were performed at 20 and 40% of maximum isometric flexion torque. Results showed that Type A individuals experienced significantly higher antagonist muscle activity than Type B individuals. Biomechanical implications and possible relations to Type A characteristics are discussed.
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