User guide

Charnwood Dynamics Ltd. Coda cx1 User Guide – Reference IV-5
CX1 USER GUIDE - COMPLETE.doc 26/04/04 156/162
The name and other attributes of an angle are defined in the Edit
Joint dialogue.
Angles are calculated from interpolated and filtered marker position
data if filtering is switched on (Setup: Data Filters...)
The plot-colour used for Angle data is that of the first Apex Marker.
Joint Angular Velocity Angular velocities for all defined Joint Angles (radians/s).
Joint Moment (Nm) Moments about the centre of rotation of all defined Joint Angles,
calculated directly from the floor reaction force vector.
See Setup: Define Joints...
Not available if Force data is absent.
Joint Power (W) Power in a joint, calculated from the (external) Moment.
Vector Angle (degrees) Angle data for any Vector Angles which have been defined in the
Setup (Setup: Define Angles...)
Vector Angles are general-purpose angles which do not have an
associated Moment and Power. They are defined as the angle
between two vectors which are themselves defined as the line
joining any two markers, the normal to the plane defined by any
three markers, or the direction of one of the Coda (lab) axes.
The angle may be calculated as the ‘3D’ angle between the vectors,
or the ‘2D’ angle projected onto one of the Coda coordinate planes.
The vectors are calculated from interpolated and filtered marker
position data if filtering is switched on.
VectAngle Velocity Angular velocities for all defined Vector Angles (radians/s) .
VectAngle AccelerationAngular accelerations for all defined Vector Angles (radians/s²).
Marker Separation(mm) The Euclidean distance between any two markers which are
‘joined’ in the Stick-figure setup (Setup: Stick-figure Joining
Diagram...).
Derived data - Segmental Gait Analysis:
Segment Ref. Point The (x,y,z) coordinates of
[X,Y,Z] (mm)
Segment Rotation The (x,y,z) coordinates of
[X,Y,Z] (mm)
3D Joint Moment The (x,y,z) coordinates of
[X,Y,Z] (mm)
3D Joint Power The (x,y,z) coordinates of
[X,Y,Z] (mm)
3D Joint Power Sum The (x,y,z) coordinates of
[X,Y,Z] (mm)
3D Joint Rot. Vel. The (x,y,z) coordinates of
[X,Y,Z] (mm)
Joint Centre Vel. The (x,y,z) coordinates of
[X,Y,Z] (mm)
Joint Centre Acc. The (x,y,z) coordinates of
[X,Y,Z] (mm)