KIN 121 Lecture Notes - Lecture 11: Actin, Sensory Cortex, Sarcopenia
16 Dec 2015
School
Department
Course
Professor
Document Summary
The type of contraction and the force required to resist an external load change as the joint angle changes. The contraction type and force required depend on whether the external force exceeds, or is less than, the internal (applied) force. Static, dynamic, concentric, and eccentric contractions may all be required. Coordination between agonist and antagonist muscles is required. Sarcomeres should be optimal distance apart so an optimal number of cross bridges is formed. If the sarcomeres are stretched farther apart than optimal. Fewer cross bridges can form and less force produced. If sarcomeres are to close together then= cross bridges interfere with one another as they form, which means less force produced. Maximal force is produced at a joint angle that corresponds to maximal cross- bridge interaction. Body mass is positively correlated with strength, provided that the mass is primarily muscle tissue or lean mass. The larger the muscle cross-sectional area, the more force it can generate.
