KINE 3030 Study Guide - Protractor, Angular Displacement, Goniometer
30 Dec 2014
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Document Summary
When you walk, you combine many angular movements (hip, knee, arm flexion/extension) to achieve linear movement of your centre of mass: highly co-ordinated by the cns. If you are talking about a joint you use relative angles; if you are talking about a segment you use absolute angles. Joint angles are defined as one segment relative to another: must define zero degrees (ie 180 degrees of elbow extension or 0 degrees of flexion) Goniometers are used to measure relative angles (essentially a protractor with arms: elgon is a goniometer with an electrical potentiometer. Inclinometers are used to measure absolute angles based on gravity. Some translation (linear movement) in certain joints (tibial-femoral) The length of the moment arm is determined by perpendicular distance from axis of rotation to force line of action (gravity)
