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Dear all,
Here are my two pennies worth of thinking about the "THE FUNDAMENTAL
PROBLEM OF MYOSKELETAL INVERSE DYNAMICS".
Remarkably, nature does not seem to bother about this fundamental problem.
Even the simplest animals (including humans) are able to consistently
reproduce their movement patterns. They do so despite variation in external
and internal conditions, their limited sensing abilities and their
ignorance with respect to the fundamentals of Newtonian mechanics. This
suggests that there should be some simplifying principle. Are we missing
something?
Furthermore, Prof Hatze seems to suggest that we need more detailed models,
more accurate measurements and better data analyses methods in order to get
more realistic simulations. This is a useful opportunity if we e.g. want to
accurately quantify the loading of internal structures. However, I doubt
whether this is the only possibility.
We could also use simple models and increase the accuracy of our
simulations by using simple and well-defined tasks. Although these tasks
are probably no normal part of daily living they might be useful for
finding some basic principles. Alternatively, we could use the imperfect
models, measurements and analyses methods as they are and limit our
conclusions to what's justified by the their accuracy. This requires a
careful consideration of the limitations.
I think that's only by combining both simple and complex models that we
might eventually be able to understand both fundamentals and details of
human myoskeletal dynamics.
Liduin
Liduin S. Meershoek, PhD
PolyPEDAL-lab | http://polypedal.berkeley.edu
Department of Integrative Biology | phone: (510) 643-5183
3060 VLSB #3140 | fax: (510) 643-6264
Berkeley, CA 94720 | meershoek@socrates.berkeley.edu
USA
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Here are my two pennies worth of thinking about the "THE FUNDAMENTAL
PROBLEM OF MYOSKELETAL INVERSE DYNAMICS".
Remarkably, nature does not seem to bother about this fundamental problem.
Even the simplest animals (including humans) are able to consistently
reproduce their movement patterns. They do so despite variation in external
and internal conditions, their limited sensing abilities and their
ignorance with respect to the fundamentals of Newtonian mechanics. This
suggests that there should be some simplifying principle. Are we missing
something?
Furthermore, Prof Hatze seems to suggest that we need more detailed models,
more accurate measurements and better data analyses methods in order to get
more realistic simulations. This is a useful opportunity if we e.g. want to
accurately quantify the loading of internal structures. However, I doubt
whether this is the only possibility.
We could also use simple models and increase the accuracy of our
simulations by using simple and well-defined tasks. Although these tasks
are probably no normal part of daily living they might be useful for
finding some basic principles. Alternatively, we could use the imperfect
models, measurements and analyses methods as they are and limit our
conclusions to what's justified by the their accuracy. This requires a
careful consideration of the limitations.
I think that's only by combining both simple and complex models that we
might eventually be able to understand both fundamentals and details of
human myoskeletal dynamics.
Liduin
Liduin S. Meershoek, PhD
PolyPEDAL-lab | http://polypedal.berkeley.edu
Department of Integrative Biology | phone: (510) 643-5183
3060 VLSB #3140 | fax: (510) 643-6264
Berkeley, CA 94720 | meershoek@socrates.berkeley.edu
USA
---------------------------------------------------------------
To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l
---------------------------------------------------------------