KPE160H1 Lecture Notes - Lecture 10: Sagittal Plane, Mechanical Equilibrium, Joint Stability
9 Mar 2019
School
Department
Course
Professor
Document Summary
Equilibrium: origin ~ 1600 equal balance, dictionary definition: state of balance achieved by equal action of opposing forces, systems theory state in which a variable of interest tends toward a constant value. Mechanical equilibria: mechanical systems focus on certain variables of interest, static equilibrium: zero acceleration, zero momentum, constant position, dynamic equilibria, zero acceleration, constant velocity, changing position or, zero net force/moment, constant momentum, changing position. Left-right sway control: each articulation that can move in coronal plane provides a way of controlling. In the lower extremity, muscle groups most responsible are: rear-foot pronators-supinators, hip abductors-adductors, can also use upper extremities and trunk strategies. Stability: origin ~ 1300 able to stand, dictionary definition: fixed in position, firmly positioned, unchanging; resistant to change or perturbation (best definition) Stability buffer: amount of energy required to destroy equilibrium. In example, buffer based on gravitational potential energy depends on height of walls.
