Reza Fazel

01-15-1997, 05:44 AM

Dear Biomech readers,

On the papers published by K.R. Kaufman, K.N. An and E.Y.S. Chao[1],

the following equation is used for the limits of the muscle force:

0 < F(i) < ( Alpha*Factive(i)+Fpassive(i) )*PCSA(i)*Sigma ;i=1:M

Alpha : Muscle activation

Sigma : Muscle stress

M : Number of muscles

Then, they have used Muscle activation (Alpha) as a cost function

in optimization method, i.e.,

Minimize(Alpha)

(Q1)- Is there one Sigma and Alpha for all muscles (i=1:M) ?

Or in the equation, they should be written Sigma(i) and Alpha(i).

In the second case, what will be the cost function?

(Q2)- I would like some information regarding the recent works on the

muscle force distribution problem (FDP) using optimization method

or any other approach. Is there any paper on FDP of the upper limb?

Thanks for your time,

Reza.

[1]- K.R. Kaufman, K.N. An W.J. Litchy and E.Y. Chao, "Physiological

prediction of muscle forces- I. Theoretical formulation", J. of

Biomech., Vol. 40, No.3, pp.781-792, 1991.

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& Reza Fazel-Rezai fazel@ee.umanitoba.ca &

& Biomedical Eng. Lab. fax: (204) 261-4639 &

& Dept. of Elect. Eng. &

& University of Manitoba &

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

On the papers published by K.R. Kaufman, K.N. An and E.Y.S. Chao[1],

the following equation is used for the limits of the muscle force:

0 < F(i) < ( Alpha*Factive(i)+Fpassive(i) )*PCSA(i)*Sigma ;i=1:M

Alpha : Muscle activation

Sigma : Muscle stress

M : Number of muscles

Then, they have used Muscle activation (Alpha) as a cost function

in optimization method, i.e.,

Minimize(Alpha)

(Q1)- Is there one Sigma and Alpha for all muscles (i=1:M) ?

Or in the equation, they should be written Sigma(i) and Alpha(i).

In the second case, what will be the cost function?

(Q2)- I would like some information regarding the recent works on the

muscle force distribution problem (FDP) using optimization method

or any other approach. Is there any paper on FDP of the upper limb?

Thanks for your time,

Reza.

[1]- K.R. Kaufman, K.N. An W.J. Litchy and E.Y. Chao, "Physiological

prediction of muscle forces- I. Theoretical formulation", J. of

Biomech., Vol. 40, No.3, pp.781-792, 1991.

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

& Reza Fazel-Rezai fazel@ee.umanitoba.ca &

& Biomedical Eng. Lab. fax: (204) 261-4639 &

& Dept. of Elect. Eng. &

& University of Manitoba &

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