A method for measuring the load imposed on the back of a sitting person

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Abstract
A method for calculating the biomechanical load on the spine (at L[lumbar]3) and certain muscles in the back was described. It utilized a small computer on-line to a force platform and the results were obtained within a few seconds. The method, which had been devised to evaluate aspects of industrial seating, dealt with vertical forces arising from support of the hands and arms, weight lifting and vertical acceleration and trunk movements. It did not deal with horizontally imposed forces. It was quicker and more accurate than calculations using manual measurements of displacements and can be applied in the field and laboratory.