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Paolo De Leva, P.e. Institute,rome - Sport Biom.
11-23-1993, 04:25 AM
Some of the subscribers might be interested in the
following info, that I originally wrote as a reply to the recent
plea by John Scholz.

I recently developed a model to estimate the inertial
parameters of the trunk, taking into account the changes in mass
distribution due to spine flexion.

I found very useful the data by Wlodzimierz S. Herdmann about
trunk mass distribution, based on computer tomography. Unfortunately,
he planned to publish his work in detail only on a book written
in Polish.
However, you can find some information about his
study in the proceedings of the XIII International Congress of
Biomechanics (Perth, Nedlands, WA).
Besides, you can call or write to Dr. Herdmann, and I am sure
he will be glad to send you all the data you need, with comments and
explanations in english. Here's the address and telephone numbers:

Wlodzmierz S. Erdmann
Depatment of Biomechanics, Academy of Physical Education
Gdansk, Poland

home: (48-58) 326008
work: (48-58) 525051

Unfortunately, he is not on Internet, and cannot be reached
by e-mail.

You might be also interested in the data about density of
trunk tissues presented in the paper:
- Erdmann, W.S., and Gos, T.L. (1990). Density of
trunk tissues of young and medium age people. J. of Biomech,
23, 9, 945-7.

Good luck,

Paolo de Leva
Sports Biomechanics Lab
Istituto Superiore di Educazione Fisica
Rome, Italy


P.S.: Contrarily to Scholz's model, my model is NOT "personalized",
i.e. it does not uses anthropometric measures taken directly on each
analyzed subject, except for the body weight. Only the 2D or 3D
coordinates of 4 landmarks (hip joint centers, suprasternal point,
"mid-trunk" point) are utilized to estimate trunk length, and degree
and direction of trunk flexion.