relative weight of human body parts

[robonave]

I have been asked to design a new chair for disable people which could rotate from normal position to horizontal position. To analyze forces on the mechanism I need the weight distribution of the various parts of human body for differents percentile can anybody help me?
Thanks

robonave

 

[turbobuilder]

If you do a simple search on "Human Factors Handbook" you'll turn up more books with that kind of information than ever thought would exist. The one I've used is titled Human Factors Design Handbook. There is a Mil spec to it's number 1472.