View Full Version : upper extremity measurement

Darren Loo
12-08-1998, 05:58 PM
Hi all,

Currently I am working on a project to measure the upper limbs movement
using Peak Motus system. Because of the lab space constrain, only two
cameras ( about 100 degree apart facing right side view of subject) are
used to capture the right arm movement for some repetitive motions such
as pick and place, packing etc...

I have few questions hoping if U could advise as I'm new with the

1) I have placed markers - spherical styrofoam balls on the shoulder,
eblow and wrist and MCP3 of the subject right arm. is this sufficient to
measure all the motion of the upper limb ? if there an extension of the
marker at wrist or eblow, then how do I measure it ?

2) I have problems in defining the angle on the Peak system. How do U
define the angles in Peak or other systems?? joint angle & joint angle
projection on different planes for the 3 joint ??

3) the posture of the subject will be either sitting or standing. Do I
have to put markers on external object such as table as reference. to in
indicate the distance between the shoulder away from the table?? then
how about the calibration frame??

4) the marker on the elbow can only be seen by one camera at certain
time. Can the software interpolate it or must it be min of 2 cameras to
view any markers at all times??

I appreciate your commands


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