Biomechanics Activity Analysis

    Each morning, I start my day drinking a cup of coffee. First, I flex my arm at the shoulder to reach for the mug in the sagittal plan and the frontal axis.  While completing these motion, I also flex at the elbow and extend at the shoulder to bring the mug to my face. Both of the actions are also done in the sagittal plane about the frontal axis. Finally, I perform ulnar deviation in the frontal plane about the sagittal axis to tilt the mug so that I can take a sip.

    When performing elbow flexion, the prime movers are the brachialis, biceps brachii, and brachioradialis. They all concentrically contract. The osteokinematics of flexion of the shoulder occur in an open kinematic chain. The humerus forms a fixed concave surface, so it rolls and slides in the same direction when moving. 


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