Biomedical Engineering Reference
In-Depth Information
40.
TRIAL CODE: WN35H
AT 25 FPS
AT 50 FPS
30.
20.
10.
0.
−
10.
20.
−
−
30.
−
40.
0.0
0.1
0.2
0.3
0.4
0.5
TIME [SECONDS]
0.6
0.7
0.8
0.9
1.0
1.1
1.2
Figure 2.14
Comparison of the hip moment of force during level walking using the
same data sampled at 50 Hz and at 25 Hz. The residual error is quite small because the
joint reaction forces dominate the inertial contributions to the net moment of force.
0.3
FFT of COPx, COMx (filtered at 6Hz)
0.25
COPx mpf=0.124 Hz
0.2
COMx mpf=0.0565 Hz
0.15
amplitude COPx
0.1
amplitude COMx
0.05
0
0
0.2
0.4
Freq. (Hz)
0.6
0.8
1
Figure 2.15
FFT of the COM and COP in the anterior/posterior direction of a subject
standing quietly for 137 seconds. (Winter, D. A., A.B.C.
(Anatomy, Biomechanics, and
Control) of Balance During Standing and Walking
. Waterloo Biomechanics. 1995)
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