BPK 142 Lecture Notes - Lecture 6: Gastrocnemius Muscle, Triceps Surae Muscle, Erector Spinae Muscles

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 142
• Professor: Mike Walsh

Document Summary

Biomechanics: application of mechanical laws to living structures (locomotor systems) Qualitative analysis: non-numerical description of a movement based on direct observation. Quantitative analysis: movement is analyzed numerically based on measurements from data collected during the performance of the movement. Insertion point of the muscle of interest on bone: force point (point where effort is applied, resistance point (point where resistance acts, fulcrum (axis of motion) The cg of the moving body segment plus any external weight. Force arm (fa): perpendicular distance from the fulcrum to the line of action of the force acting on the force point. Resistance arm (ra): perpendicular distance from the fulcrum to the line of action of the resistance acting on the resistance point. Fulcrum is between the force point and the resistance point. Example: triceps muscle acting at the elbow joint: fulcrum elbow joint, force point olecranon process, proximal to the, resistance point cg of the forearm elbow joint, where the triceps muscle inserts.