Hello,
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Trying to represent 3D position of average GRF vector resulted after a number n of trials [n=10 in my case] using a force platform, I've met the problem of "average COP" trajectory .
As:
- the position of each COP trajectory is variable related to the force platform area and
- the first and the last five percent of stance phase are ignored in order to avoid errors during low vertical forces [Nachiappan Chockalingam et all, Scoliosis 2008, 3:10],
put me in the front of the problem to find a method of determining an average trajectory of COP.
In "Effects of Simulated Genu Valgum and Genu Varum on Ground Reaction Forces and Subtalar Joint Function During Gait",Bart Van Gheluwe,Kevin A. Kirby, Friso Hagman it is defined "the inertial axis of the foot" which allow a "pressure-oriented definition of center-of-pressure displacement".
Will be very helpful any thoughts regarding:
1. I don't understand very well how is defined "the inertial axis of the foot"- what exactly is "center of weightbearing pressure of the heel". Could somebody help me with an explanation ?
2.Could be used the inertial axis of the foot as a reference system for defining COP trajectory ?
3. There is other possibility to calculate an average COP trajectory from the data obtained with a force platform ?
Thanks in advance,
Daniel
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