Biomedical Engineering Reference
In-Depth Information
Figure 17.13
Left panel: scheme of the standing posture (COM: center of mass; COP: center of
pressure); Right panel: COM and COP oscillations in the sagittal plane.
Figure 17.14
Left panel: motorized rotating platform mounted on top of a force platform. Right
panel: ankle rotation r
(
t
)
and COP displacement
y
(
t
)
. During the quick rotation of
1
o
,
the platform (
r
=
T
=
150ms ) the COM is virtually fixed and the shift of
the COP (
y
) can be totally attributed to the ankle stiffness. Ankle stiffness can be
estimated by means of the following equation:
mg
=
y
K
r.
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