View Full Version : Muscle and generation of force

Panagiotis Artemiadis
08-31-2004, 11:50 PM
Dear Sirs,

I am working on my PhD on the Control System Laboratory
of the Mechanical Engineering Department of the National
Technical Universoty of Athens, Greece.

I would like to ask some questions
about muscle and generation of force.

I would like to use the Hill-model
which constitutes of a Contractile Element
(CE), a Series Elastic Element (SE) and a
parallel element (PE).
First of all I would like to pose those questions:

CE corrresponds to muscle fiber,
SE to tendon and PE to other
passive elements??

Additionally, I have a question about the
lengths of these elements. I have the following
data for biceps (long) muscle:

Lmt (max) = 41.94 cm, max musculotendon length
Lmt (min) = 26.06 cm, min musculotendon length
LoM = 15.36 cm, optimal muscle fiber length
LsT = 22.93 cm, tendon slack length

As I can understand the sum of the muscle fiber
length and the tendon length is the Lmt length.
Is this right?

My question is this:

In the value of LsT = 22.93 is the lenght of
muscle fiber included?

My question is based on the fact that I use
the above equations:

Fse = (Fsemax/(exp(SEsh) -1 ))*(exp(SEsh*dLse/dLsemax) - 1);
Fpe = (FPemax/(exp(PEsh) -1 ))*(exp(PEsh*dLpe/dLpemax) - 1);

and I wonder how can I compute the values of
dLse, dLsemax,dLpe,dLpemax, which are the extensions
of the elements SE and PE, subscript max indicates
corresponding maximal values.

I would be very gratefull if you can answer my question.

Thanks in advance,

Panagiotis Artemiadis

Panagiotis K. Artemiadis
PhD Candidate
Control Systems Laboratory
Mechanical Eng. Dept
National Technical University of Athens
9 Heroon Polytechniou Str.,
Zografou Athens 15700, Greece
Phone : ++30 - 210 - 7723656

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