HSS 2111 Lecture 3: Biomechanics
28 Jan 2017
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Document Summary
Research and application study of human structure and function of biological systems (i,e musculoskeletal system) through application of mechanics. Static and dynamic (what can be visibly observed), kinematics (time, space; description of motion), kinetics (description of motion with force production and absorption in tissues as source of motion: platforms, emg) Types of movement: linear and angular motion (rotation); general motion. Lever: rigid bar (i. e bone) that rotates around a fixed point (fulcrum) fulcrum: pivot point (i. e joint); load: resistance (i. e external weight); effort: force (i. e internal musculotendinous unit) First-class lever: fulcrum lies btwn force and resistance (force-axis-resistance), like a seesaw; i. e lifting head after looking down, allow to balance head on vertebral column; intermediate. Second-class lever: resistance lies btwn fulcrum and the force (force-resistance- axis), like wheelbarrow; i. e stand on your toes; most mechanically efficient. Third-class lever: force lies btwn fulcrum and resistance (resistance-force-axis), like shoveling; i. e brachioradial joint; least mechanically efficient.
