Measuring and characterizing force exposures during computer mouse use.
OBJECTIVE
The purpose of this study was to develop and validate a sampling strategy for characterizing the finger force exposures associated with computer mouse use.


METHODS
Mouse forces were measured from 16 subjects (8 men, 8 women), on 3 separate days, at their actual workstations while they performed (i) their regular work, (ii) a battery of standardized tasks, and (iii) simulated mouse use.


RESULTS
The forces applied to the mouse did not vary between hours or days. During regular work, the mouse was used 78.0 (SD 40.7) times per hour, accounting for 23.7 (SD 9.5)% of the worktime. The mean forces applied to the sides and button of the mouse were low, averaging 0.6 % (0.35 N) and 0.8 % (0.43 N) of the maximal voluntary contraction, respectively. The forces applied to the mouse during the standardized tasks differed from the regular work forces; however, there were moderate-to-strong correlations between the 2 measures.


CONCLUSIONS
With respect to performing exposure assessment studies, the 3 major findings were (i) mouse force measurements should be made while subjects perform their actual work in order to characterize the absolute applied force accurately, (ii) the forces applied to the mouse during the performance of a short battery of standardized tasks can be used to characterize relative exposure and identify computer operators or work situations for which higher forces are applied to the mouse, and (iii) subjects cannot accurately simulate mouse forces.
Johnson
P W
PW
Department of Occupational Medicine, Sahlgrenska University Hospital, Göteborg, Sweden.
Hagberg
M
M
Hjelm
E W
EW
Rempel
D
D
D000328:Adult; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D016287:Computer Peripherals; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology; D009140:Musculoskeletal Diseases / Q000209:etiology; D009784:Occupational Diseases / Q000209:etiology; D012307:Risk Factors; D012737:Sex Factors; D013647:Task Performance and Analysis