EXSS2029 Lecture Notes - Lecture 2: Time Series

• School: University of Sydney
• Department: Exercise and Sport Science
• Course: EXSS2029
• Professor: Amanda Semaan

Document Summary

Specific filming requirements (stationary, perpendicular position, calibration, markers of joint centres. Measurement of joint angles requires calibration frame to know distance of frame (provides x and y axes) Absolute and relative angles of segments and joints. (cid:272)a(cid:374) (cid:271)e i(cid:374) a si(cid:374)gle fra(cid:373)e or a (cid:858)ti(cid:373)e series- eg. a(cid:374)gular displa(cid:272)e(cid:373)e(cid:374)t of the k(cid:374)ee(cid:859) (cid:272)o(cid:373)ple(cid:454)it(cid:455)/a(cid:373)ou(cid:374)t of (cid:373)arkers (cid:272)hose(cid:374) (cid:272)o(cid:373)pro(cid:373)ises (cid:858)ease of (cid:373)easure(cid:373)e(cid:374)t(cid:859) a(cid:374)d (cid:858)validit(cid:455) of (cid:373)easure(cid:373)e(cid:374)t(cid:859) Absolute angles: measured with respect to the world from right hand horizontal. Relative angles: difference between 2 absolute angles, shows us actions of joints = muscle action. Reference angle: the angle from which a relative angle is calculated from. Eg. assume anatomical position is zero > report angle of flexion from that point. Need multiple cameras to see all axes. Need 6 values to describe joint motion (6 degrees of freedom) > angular displacement (eg. flex, abduct, axial rotation) Creates difficulty when judging angles viewed from only one direction.