Computer Input Devices — Race and Gender: Is there a mismatch between anthropometry and input device design

Abstract

Studies have shown an association between intensive computer use and the onset and development of upper extremity musculoskeletal disorders. However, the evidence for possible health effects related to computer input device design and operator anthropometry is limited. The aim of this study was to systematically examine relationships between the current sizing of computer input devices and key anthropometric differences, based on gender and race, in adult computer users. Computer input devices appear to be designed based on anthropometric clearance issues to accommodate the largest users (95th percentile Western males). Based on this current design, less than 6.1% of the worldwide population would “fit” the current pointing device and keyboard design standards. Finger mass is a critical component for determining device activation forces When comparing male and female hand anthropometry, finger mass accounted for the largest anthropometric difference with the 50th percentile females' hand only 73% the mass of the 50th percentile males‘. With respect to similarities, in virtually every aspect of seated workstation anthropometry (i.e. furniture requirements), the 50th percentile Western female very closely approximated the 50th percentile Asian male. The findings of this study indicate that gender and race base differences in workstation design are small relative to the differences in input device activation forces based on hand anthropometry. It appears that the current “one size fits all” paradigm used to design computer input devices may not be optimal. Smaller devices with lower activation forces could benefit a large percentage of the world population.