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Dear Biomech-L subscribers:
I am looking for the experts' helps of finding a simple biomechanical model to estimate the lower back compressive force while people sitting on a chair with the back support. Although to modify the lifting model used in Chaffin and Andersson's textbook seem to be one of possible approaches, I have a little bit concern about the estimation of sacral beta angle in this model. Can the estimation of sacral beta angle suggested by Anderson (1986) be used in a seating position? Of course, the lumbar support will effect the pelvic angle as well which make thing even more complex.
In the searching of previous studies, I found out some researchers reported the direct measurement results of disc pressure in the various seating conditions. But I cannot find a model for the prediction so far. Does anyone have better suggestions or references? Thanks!
-Max
Chien-Chi (Max) Chang, Ph.D.
Liberty Mutual Research Center for Safety Research
71 Frankland Road
Hopkinton, Massachusetts 01748 USA
Telephone: (508)435-9061 x260
E-Mail: Chien-Chi.Chang@Libertymutual.com
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I am looking for the experts' helps of finding a simple biomechanical model to estimate the lower back compressive force while people sitting on a chair with the back support. Although to modify the lifting model used in Chaffin and Andersson's textbook seem to be one of possible approaches, I have a little bit concern about the estimation of sacral beta angle in this model. Can the estimation of sacral beta angle suggested by Anderson (1986) be used in a seating position? Of course, the lumbar support will effect the pelvic angle as well which make thing even more complex.
In the searching of previous studies, I found out some researchers reported the direct measurement results of disc pressure in the various seating conditions. But I cannot find a model for the prediction so far. Does anyone have better suggestions or references? Thanks!
-Max
Chien-Chi (Max) Chang, Ph.D.
Liberty Mutual Research Center for Safety Research
71 Frankland Road
Hopkinton, Massachusetts 01748 USA
Telephone: (508)435-9061 x260
E-Mail: Chien-Chi.Chang@Libertymutual.com
---------------------------------------------------------------
To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l
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