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Arturo Forner
02-02-2000, 09:34 PM
Dear All,
I want to thank all the people that answered my question. Each answer
contained valuable information, I am very thankful to all of you. As
there were many responses I include a brief summary of each one (sorry
for the length but I hope it is useful):

Gery Colombo from Klinik Balgrist in Zurich use a split belt treadmill
(two belts) from Woodway GmbH with integrated force plates. It is
possible with this treadmill to measure horizontal forces and also to
estimate the point of application of the force.
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Chris Stevens, from Clinical Biomedical Engineering Centre, Queen Mary's
Hospital, gave me the address of Leia Bagisteiro from the University of
Surrey. She has developed a very nice treadmill with integrated Force
plates under the belt.(Note from A. Forner: I contacted her she gave me
some references and very useful remarks, thanks Leia!: - Bagesteiro,
L.B., Hughes, S.C. and Ewins, D.J. (1999) Ground reaction
force-measuring treadmill for analysis of prosthetic feet. Medical &
Biological Engineering &Computing 37, Suppl.2 - Part I.828-829.)
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Christian Peham from the the University of Veterinary Medicine Vienna
said that: Kistler sells a treadmill with force-measuring system.
(Only vertical forces). Page:
htp://www.kistler.ch/biomech/biomech_products_9810.htm. and that Michael
Weishaupt (University of Zuerich) works with a treadmill for horses with
a force-measuring system.
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>From Barry Creighton: Parotec-System of Germany has a system that can
measure shear forces as well as vertical GRF. It does this with several
small fluid filled spaces within the sole. It works by measuring fluid
displacement resulting from GRF. I don't know how accurate it is; I
have never seen any literature that measures it for such. Never the
less, I think the concept is good. Roley is the company's owner. His
email address is Roley@Paromed.de.
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Jon Dingwell from the Rehabilitation Institute of Chicago gave me the
useful reference of one of latest Rodger Kram's treadmill developments.
I don't know of anyone making shoe insoles that can measure measure
shear forces, or measure vertical forces accurately. However, Rodger
Kram at UC Berkeley has designed and built a couple of treadmill / force
plate devices. He's the man to talk to. His web address and references
for his two treadmill publications: Kram, R., Griffin, T.M., Donelan,
J.M., Chang, Y.H., 1998. Force Treadmill for Measuring Vertical and
Horizontal Ground Reaction Forces. Journal of Applied Physiology 85 (2),
764-769. Kram, R., Powell, A.J., 1989. A Treadmill-Mounted Force
Platform. Journal of Applied Physiology 67 (4), 1692-1698.
http://socrates.berkeley.edu/~rkram/
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Christian Clame from Kistler said that Kistler manufactures Gaitway, a
treadmill with built-in force plates that measures the vertical force
and the center of pressure. It has a foot separation system which allows
natural walking, good COP accuracy and a clinical protocol function.
Page http://www.gaitway.com
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Jean-Luc CHAVEROT from the CTC in Lyon (France) contributed with the
reference of a french company (Tech Machine, group hef) that sells
treadmill with ground platform. They have different systems:
ADAL 3D C adapted for running : speed range up to 25km/h
ADAL 3D BV adapted to operate at very low speed : 0.2 to 5 km/h
ADAL 3D Fm adapted to measure for each leg the 3D forces and Mz Torque.
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Related to this, Marco Cardinale from Italy gave me the reference of
Dr. Alain Belli in France is conducting experiments on running mechanics
with a system like that and also did a software for analysis of data.
(Note from A. Forner: I have found that Dr. Belli is using the ADAL
system and that they are preparing a paper about the performance of the
system).
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Marilyn Powers from Gait Lab at the University of Calgary answered:" You
should check out kistler and AMTI webpages. I noticed that both had
force plates in treadmills. The addresses are www.kistler.com and
www.amtiweb.com". (Note from A. Forner: AMTI has no force plates
commercially available but they have supplied force plates that are
mounted in treadmills).
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>From OTRGRAY@aol.com (?): I have recently seen a new product from
Chattanooga Group, Inc. which incorporates weight measuring technology
in a shoe which transmits to a handheld receiver. The receiver shows
actual weight applied up to 220 pounds (don't know if they have a SI
unit yet). The shoe is not suitable for running because it has a rigid
sole like a cast boot, but it is designed to be accurate in displaying
the amount of weight applied to a limb during slower ambulation. The
product is called the AccuTread Limb Load Performance System.
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Young-Hui Chang from Berkeley: Our lab has designed and built a
force-measuring treadmill capable of measuring vertical and horizontal
components of GRF. It can also measure ground reaction moments in all
three axes, which allows us to calculate the point of force application
during single support. Natural frequencies are well-above the range of
the frequency content for normal walking and running. We have been
collecting data on it for three years now with few problems and it has
greatly increased our efficiency for collecting GRF data. Reference: R.
Kram, T.M. Griffin, J.M. Donelan, Y.-H. Chang. A force-treadmill for
measuring both vertical and horizontal ground reaction forces. Journal
of Applied Physiology, 85: 764-769, 1998.
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Dr. Chris Kirtley from the Hong Kong Polytechnic University:
There is a treadmill suitable for what you want. It is made by a French
company. Unfortunately, I forgot their name. It is very expensive. (Note
from A. Forner: I found the name is ADAL from Tech Machine). There are
some flat in-shoe shear sensors, Kent Shear System (Shearscan), but not
yet commercial: see Razian M & Pepper M ‘A novel tri-axial force
transducer for in-shoe and other biomechanical applications’ in Journal
of Biomechanics 31, 11 (1998) and 11th Conference of the ESB (1998).
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>From At Hof (University of Groningen, here in The Netherlands): The
Cologne people have developed a completely new treadmill Abstracts in
Gait and Posture 10:82-84 (1999). Especially measuring the fore-aft
shear forces is really difficult, due to the effects of band friction.
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Also, I would like to mention Rodger Kram from Berkeley for contacting
me about his paper from 1998 and letting me asking some questions about
this work.
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>From Arturo Forner: I found another treadmill with a double force-plate
for measuring the only the Vertical Component of the Ground Reaction
Force developed by Biometrics in The Netherlands. (Thanks Arturo!).

Yours sincerely,
Arturo Forner Cordero
Research Assistant (PhD student)
BMTI. Biomechanical Engineering. BW/WB
University of Twente WB gebouw Kamer 120 Z
7500 AE Enschede. The Netherlands
Tel. +31 (0) 53 489 2462
Fax. +31 (0) 53 489 3695



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