KINE 3030 Lecture Notes - Lecture 9: Agonist, Muscle Contraction
30 Dec 2014
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Force output of a muscle allows us to move. Agonist muscle can be an eccentric contraction. If i go down and immediately go back up, my jump will be higher as opposed to if i stayed down and then jumped up. Eccentric contraction (when muscle is stretched) followed immediately by concentric contraction. Elastic tissues store potential energy which is then released along with the force produced by the contractile component during concentric contraction. There remains debate about how this happens and is controlled. Muscle velocity depends on what the joint is doing. Direction of force of the muscle is along the line of action. Image: draw a line between origin of insertion and that gives you the line of action. Line of action splits that turns the muscle (joint- rotary component) perpendicular to bone and one that is along the bone itself when not at 90 degrees. Muscle force is more a stabilizing component that more i straighten my arm.
