A new approach to the mouse arm syndrome.
OBJECTIVE
The study validates a new computer mouse concept. The tested device is a small mouse with a pivoting pen-shaped handle. The hypothesis behind the design is the assumptions that the pen grip requires less static tension than the normal mouse grip and that fine-motor, high precision tasks normally are done with finger movements with forearm at rest.


METHODS
Four muscles were monitored with electromyography (EMG) during work with a new mouse and with a traditional mouse.


RESULTS
EMG activity was significant lower, in M. pronator teres--46%, M. extensor digitorum--46%, M. trapezius--69%, and M. levator scapulae--82%, during work with the new mouse as compared to the traditional mouse.


CONCLUSIONS
Altering the design of the computer mouse can significantly reduce muscular tension.
Ullman
Johan
J
Medinova AB, Gothenburg, Sweden. johan.ullman@ullmans.com
Kangas
Nils
N
Ullman
Pia
P
Wartenberg
Fredrik
F
Ericson
Mats
M
D002349:Carpal Tunnel Syndrome / Q000503:physiopathology; D016288:Computer Terminals; D012090:Cumulative Trauma Disorders / Q000503:physiopathology*; D004576:Electromyography; D004867:Equipment Design; D006801:Humans; D018482:Muscle, Skeletal / Q000503:physiopathology*; D009784:Occupational Diseases / Q000503:physiopathology*; D013577:Syndrome