Activity Analysis: Drinking Coffee

 My morning routine almost always includes a cup of coffee- also known as liquid motivation. After filling the mug and stirring in vanilla almond milk creamer, I sip on the coffee as I prepare for the rest of my day. After placing my fingers around the handle of my mug, my elbow flexes and extends as I move the mug to and from my mouth. My elbow is flexed as i bring the coffee toward my mouth, and it extends as I return the mug onto the table. This motion of the elbow takes place in the sagittal plane about a frontal axis. The Osteokinematics can be described as flexion and extension in an open kinematic chain. The concave surface of the proximal ulna rolls and glides anteriorly on the convex surface of the distal humerus. The prime mover during this action is the brachioradialis which contracts concentrically during elbow flexion when the forearm is in a neutral position.