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Dear Netters,
I'm working on a problem dealing with speed control in
human walking modeling the stance phase of gait as an
inverted pendulum with a forcing function and an
attached spring. I'm attempting to estimate the
magnitude of the forcing function (assumed to act on
the center of mass of the body) by measuring the net
moment of the COM about the stance ankle. I'm
particularly interested in how the forcing function
changes with walking speed/frequency and not its "real"
value.
THe problem is that I only have video data (no force
plate) and must estimate the contribution of the
ground reaxn force to the net moment. Can anyone
suggest references that: a) relate the moment of the
COM about the stance ankle to the GRF across changes
in walking speed and frequency and b) relate the
magnitudes of the GRF to walking speed and frequency?
I'll post any responses.
Jack Obusek
Graduate Student
Dept of Physical THerapy
Boston University
(617)353-7508
obusek@sarvx1.bu.edu
I'm working on a problem dealing with speed control in
human walking modeling the stance phase of gait as an
inverted pendulum with a forcing function and an
attached spring. I'm attempting to estimate the
magnitude of the forcing function (assumed to act on
the center of mass of the body) by measuring the net
moment of the COM about the stance ankle. I'm
particularly interested in how the forcing function
changes with walking speed/frequency and not its "real"
value.
THe problem is that I only have video data (no force
plate) and must estimate the contribution of the
ground reaxn force to the net moment. Can anyone
suggest references that: a) relate the moment of the
COM about the stance ankle to the GRF across changes
in walking speed and frequency and b) relate the
magnitudes of the GRF to walking speed and frequency?
I'll post any responses.
Jack Obusek
Graduate Student
Dept of Physical THerapy
Boston University
(617)353-7508
obusek@sarvx1.bu.edu