Davis P R, Stubbs D A, Ridd J E
J Med Eng Technol. 1977 Jul;1(4):209-12. doi: 10.3109/03091907709160645.
A system for the quantitative assessment of spinal stress during manual materials handling has been developed. This has been achieved using radio pressure pills and is applicable to both laboratroy and field use for establishing safe general handling procedures and defining safe maximum loads.