Someone maybe have some article or formula to make torque gravity correction for the limb weight?? I want to make this for valid H/Q (hamstring-to-quadriceps) ratio during isokinetic torque measurements.
Hi Artur,
May I know whether you are using a typical isokinetic equipment like Cybex? Or, you have your own setup.
For Cybex, there is built-in feature for gravity compensation.
Hi Artur, maybe you will find this piece useful - see the link. Also in Biodex there is also a gravity correction embedded (Limb Weight).
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2849864/
Mr. Man Cheung - in my University we using Biodex 4 Pro with his software.
Thank you Krzysztof for this article, this is what i need to find. However, if Biodex software have gravity correction implemented then all my problems are gone :)
Artur the piece I gave you is a new approach to modify existing procedures :) I will try to dig out the original ones. Iwill also send you the clinical research manual where the procedure is described as a G.E.T.
Additional question about gravity correction in the Cybex Humac norm:
We investigate the shoulder internal/external ration in tetraplegics. We use the "seated mod" setting and use the built in gravity correction/weighing the limb. When we analyze the data should we just report the data in preview or check the button "gravity correction"? When we tick off the box "gravity correction", we would expect the software to subtract the MAXGET from internal rotation (gravity assisted direction) and add to the external rotation (gravity resisted direction) BUT Cybex seems to do the opposite! So we get increased ratios, far off the normative values previously reported. So, to get the correct peak torque, should we just gravity correct after the ROM setting and no further, or do it again in the analysis? Yours sincerely, Claus Bech, University of Southern Denmark
Krzysztof Cygoń I am running an older version of the Biodex software in my lab (Biodex Medical Systems Rev 4.47 Feb 7, 2012). I fear that the GET is not correct for some of my data (tester error on weighing the limb). I believe the tests themselves are valid, but that measurements such as peak torque might be off if the GET is off. 1) is there a way to see the raw data without the GET? 2) Or is there a way that I can manually adjust the calculation? For example, if the GET is "5 N-M" but I know from another day that it was measured accurately that it should be "10 N-M," can I add 5 to knee extension and subtract 5 from knee flexion? I appreciate any help! Thanks! Stephanie, [email protected]
Good day, Krzysztof Cygoń ! I am part of a research team from the Philippines and we are currently using the Biodex S4. We are not yet aware of all of the capabilities of the dynamometer as it is just new in our laboratory. May I ask where can we get a copy of the clinical research manual that you mentioned in your response to Artur?
Thank you.
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