View Full Version : Response to Cybex 6000 Isokinetic Dynamometers

Joel T. Cramer
02-05-2003, 04:27 AM
Thanks to Tim Wrigley (Biomechanics Unit, Victoria University,
Melbourne, Australia) for the detailed response to my original posting
regarding the extraction of data from a Cybex 6000 isokinetic
dynamometer (posted 01/23/02). The specific machine that I was
inquiring about is a 1991-1993 Cybex 6000 Testing & Rehabilitation
System (CYBEX Division of LUMEX, Inc., Ronkonkoma, NY). Also, thanks to
Rob Potash (CSMI Solutions) for the information on the HUMAC upgrade.
The following responses are below:


Tim Wrigley wrote:

Analog output should obviously also be possible, but I don't have the
pinouts / signal locations. I'd be interested if you get any answers
from elsewhere - I've got analog signals out of Cybex II, Biodex and
Kin-Com, but not the 6000. Cybex / Lumex / Henley, as you probably know,
no longer exist. However the machines are still supported by local
agents around the world, and that sort of technical information probably
still exists somewhere. I could give you some possible companys in
Europe if you come up empty elsewhere.

However, the data file access route is one I do have experience with. I
did it about 10 years ago for a project I was doing with a local clinic
that has a 6000, using inforamation I got from Cybex at the time. It's
difficult to set up but not impossible. If you're going to be working
with the machine for a while, it's probably worth doing. I'll give you
an overview of what's involved, so you can decide what you want to do.
There's no point getting into the nitty-gritty until you decide to go

The 6000 software incorporates probably the best 'industrial-strength'
database implementation ever done for an isokinetic dynamometer. It's
based on a product/format called R:Base, which was arguably the first -
and one of the best - relational databases developed for the PC.
Products like Access only began to rival it years later. But like most
non-Microsoft products, it's pretty obscure these days. However, it was
bought out and resurrected a few years back, see ...

So the first thing you'll need is a version of the R:Base product (it's
not too expensive) or another database product that will read RBF files
(I don't know of a current one - Access doesn't as far as I know). You'd
probably copy the database files to another machine, so you can run
under Windows. The database stores both calculated results data and the
information necessary to locate and extract the torque data from the
separate binary data files (only the torque data and a pseudo form of
angle data is stored in the data files) .... so you need access to the
RBF files whether or not you just want to get at the torque data.

The 6000 software was written using an earlier version of R:Base (v3.1 I
think). R:Base have since changed their file format, so you would have
to copy and convert the RBF files in C:\CYBEX\CYBDB to the current
format in order to read them with their latest products.

You will need to know your way around a multi-table relational database
.. the subject details are in the CLIENT database, which links to the
test details in several tables in the TEST database. If you just want
the calculated results, you will be able to find them there. From
memory, I think I then exported them in ASCII format to Excel for
further analysis. All this querying / exporting / importing work is
basically done manually (altough you could probably write something in
R:Base to automate it).

If you want the torque and angle data, you will need to extract the
information to find that data in the binary data file (each subject has
only one test data file, with all their test data) from the database ...
ie data file name, and pointers to the data blocks. You will then need
to write a program that finds and extracts the data you want from the
binary file, using that information. You could do that in Visual Basic,
C++, Matlab (my preference), etc.

Hope this helps. Let me know if you have any queries.


Tim Wrigley
Biomechanics Unit
Victoria University


Rob Potash wrote:

Our HUMAC Update for the CYBEX:

1) replaces the original 386 computer, DOS application, and interface
2) includes USB interface that includes external interface for you to
capture data directly
3) saves all raw data. data can be exported in Excel and Text formats

Literature and sample CD are on the way. Thank you for your interest and
let us know if we can help.


Rob Potash
Vice President
57 Providence Highway
Norwood, MA 02062
781-255-1292 - tel
781-255-1293 - fax


Joel T. Cramer
University of Nebraska-Lincoln
Department of Health and Human Performance
Center for Youth Fitness and Sports Research
145 Mabel Lee Hall
Lincoln, NE 68588-0229
Phone: (402) 472-3846
Fax: (402) 472-4305
E-mail: jcramer@unlserve.unl.edu
Web: http://tc.unl.edu/jtcramer/

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