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Ground reaction forces

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Ground reaction forces were measured using two 6 degrees of freedom force plates (AMTI, Watertown, MA). The coordinate system is a right-handed system.

Raw data:

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fx,y,z 1/2 Ground reaction forces, forceplate 1 and 2 N 960 Hz
Mx,y,z 1/2 Moments relative to the original forceplate coordinate system, forceplate 1 and 2 Nmm 960 Hz

For the calculation of the center of pressure the following offsets were used. The true origins of the coordinate systems are located below the top surfaces, with a distance (zo).

GroundReactionForces 01.png GroundReactionForces 02.png

Processed data

(see Comprehensive Data Sample):

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fgrx,y,zi Ground reaction forces, ipsilateral leg N 90-110 Hz
COP_x,yi Center of pressure, relative to forceplate center, ipsilateral leg mm 90-110 Hz
Tz_i Torque around z-axis at CoP, ipsilateral leg Nm 90-110 Hz
GroundReactionForces 03.png


grf2f.eof data:

(Downsampled Ground Reaction Forces)

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fgrxi,yi,zi Ground reaction forces, ipsilateral leg N 90-110 Hz
Fgrxc,yc,zc Ground reaction forces, contralateral leg N 90-110 Hz
F Resultant joint contact force (implant) N 90-110 Hz
GroundReactionForces 03.png