View Full Version : Re: Inverse dynamic data from an unstable surface on a GRFplatform?

David Smith
09-17-2006, 06:14 PM

Do you intend to use 3D video (eg vicom) aswell as force plate? If not then
i can't imaging how you will get any
further than deternining the forces on the force plate. You won't know the
location and accelerations of the limbs and joints so you can't calculate
the joint forces. You can only guess about the relationship of the force
time graphs to the body motion. I would think the only way this might be
useful is as comparative data.

Cheers Dave

----- Original Message -----
From: "Toran MacLeod"
Sent: Friday, September 15, 2006 9:34 PM
Subject: [BIOMCH-L] Inverse dynamic data from an unstable surface on a GRF

> Does anyone have a suggestion for how to acquire data for inverse
> dynamics, if the foot forces are going through an unstable surface before
> hitting the GRF platform?
> I'm interested in putting a subject on the flat surface of a bosu ball
> (half of a thera-ball with a solid surface http://www.bosu.com/ ) to do
> single leg squats. A GRF plate beneath the ball would be able to collect
> all the forces, and the center of pressure. My concern is that the motion
> and height of the bosu ball will require too many assumptions for accurate
> inverse dynamics data.
> Any thoughts or articles you can direct me to for help?
> Toran MacLeod
> California State University, Sacramento
> http://www.sacramentoroc.com
> http://www.hhs.csus.edu/PT/
> http://www.hhs.csus.edu/khs/Facilities/Facilities.htm#biomechanics
> http://www.ucdmc.ucdavis.edu/pmr/patient_services/therapeutic/physical.html
> http://www.lafootplus.com
> http://www.cuisineforfitness.com
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