different thumb motor performance, device movement, and joint
postures during tapping tasks on a mobile computing device. These
findings suggest that device designs that allow two-handed grips
may enable users to increase performance relative to a one-handed
grip. Encouraging users to employ two-handed grips through
hardware or software design may increase performance and reduce
musculoskeletal strain during mobile device use relative to a onehanded
grip.
Acknowledgments
This study was funded in part by the National Science Foundation
(0964220), and the National Institute for Occupational Safety
and Health (R01 OH008373). The authors thank the Office Ergonomics
Research Committee for their additional support.