View Full Version : Re: 3D Joint Power

Ton Van Den Bogert
01-27-2004, 03:49 AM
Young-Hoo Kwon, Ph.D. wrote:

> Joint power is the dot product
> of the net joint force and the linear velocity of the joint.

> On the other hand, the muscle power is the dot product of the net joint
> torque (muscle moment) and the angular velocity of the segment.

We first need to agree on a common terminology, to avoid confusion.
So far in this discussion, we used the term "joint power" for what
Young-Hoo calls "muscle power".

> For the reasons presented above, Fv = Mw is incorrect.

I think Richard used the symbols as follows:

F = muscle force
v = muscle shortening velocity

Then, for a uni-articular muscle, the equality Fv = Mw is valid.

Let's *not* talk about the dot product of joint force and linear
velocity, this is a different discussion (but equally interesting).



A.J. (Ton) van den Bogert, PhD
Department of Biomedical Engineering
Cleveland Clinic Foundation
9500 Euclid Avenue (ND-20)
Cleveland, OH 44195, USA
Phone: (216)444-5566
Fax: (501)665-1506

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