The Influence of Chair Geometry on Sit-to-stand Forces

H.C. Turner, R.M. Yate, G.E.B. Giddins, and A.W. Miles (UK)

Keywords

Sittostand, force measurement, upper extremities.

Abstract

The ability to rise from a chair is critical for mobility but rising using the hands imposes high loads on the hands and wrists. A method has been developed for measuring simultaneously the forces applied at the hands and feet during chair rising with the aid of the arms, for a range of chair geometries. Hand forces were measured using strain gauged chair arms and foot forces were measured by a force plate. The seat height, chair arm height, chair arm angle and chair arm spacing were adjustable. Twenty normal subjects participated in the study (22 to 56 years of age, mean 32.7 years). Forces at the hands and the feet were recorded as each subject stood up from the chair, for a range of chair geometries. The magnitude of the vertical loading through the hands influenced the vertical foot loading pattern seen during rising. Increasing the seat height and increasing the chair arm height caused reductions in the average peak vertical load applied by each hand during rising.

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