Lecture 8.docx

Lecture 8.docx - Angular Kinematics Measures Review When...

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Angular Kinematics Measures Review When the angle or angular velocity of interest is of a JOINT (between TWO different segments), then you are measuring a RELATIVE angle/angular velocity When the angle or angular velocity of interest is of a SEGMENT (a segment with respect to the space around it), then you are measuring an ABSOLUTE angle/angular velocity Tools for Measuring Angles Relative Angles o Goniometer used for direct measurement of relative joint angles protractor with arms centre placed over joint centre; arms aligned with long bones “elgon” is a goniometer with an electrical potentiometer at vertex Absolute Angles o Inclinometer is a gravitationally based instrument that identifies the absolute angle of orientation of a body segment challenge to accurately position the inclinometer Problem 8 (page 381 ) Measure and record the following angles for the drawing below: o a) The relative angle at the shoulder it is a joint angle shoulder is trunk to upper arm put protractor and it comes to 50 degrees o b) The relative angle at the elbow between upper arm and forearm 90 degrees o c) The absolute angle of the upper arm (use right horizontal as reference) not talking about a joint in the perspective of measuring a joint angle measuring a joint angle is taking 2 body segments and measuring angle between them need to have a consistent reference so when you compare 2 points in time, you know it’s a consistent reference absolute angle means referenced to something in the world o d) The absolute angle of the forearm (use right horizontal as reference) put a horizontal line and do it from the wrist to the right get 150 degrees Instantaneous Centre of Rotation when we have a joint angle, we talked about how angular motion occurs when you have that axis of rotation we are rotating around

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o in human motion, it is important to know whatever that imaginary line we are rotating around changes as we go through the motion In a joint, bones move (slide and spin) relative to one another o e.g., knee flexion: medial rotation & anterior slide of femur on tibia
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• Angular distance,  measure

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