KINE 3030 Lecture 12: Lecture 12 notes
20 Feb 2019
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The ability of a muscle to generate torque at a particular joint is derived from: Moment arm of contributing muscles with respect to joint centre. If someone is holding a weight compared to someone else is holding same weight in different position; they will have different strength. When 2 muscles come into the bone at a 90-degree angle, muscle force is split into. Rotary component: perpendicular to bone causing torque around joint 190 degree to bone. Stabilizing/dislocation component: along axis of bone either pulling two bones together or pulling apart (along axis of bone) Force output of contractile component fibre length dependent. Passive elastic structure (parallel and series) get stretched as muscle increases in length. In arm it pulls the ulna and humerus together when arm is being pulled up. Force a muscle is able to produce is dependent on length of muscle at that point in time. 2 sources of force production in muscle.
