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Assessment of functional parameters and comfort of a new computer mouse as compared with other types of input devices

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Dehghan N. , Choobineh A. , Razeghi M. , Hasanzadeh J. , Irandoost M. , Ebrahimi S.

International Journal of Occupational Safety and Ergonomics

2015

tom Vol. 21, No. 4

493--497

Background. This study was conducted to assess functional parameters and comfort of a new computer mouse (Ergomice) as compared with three other input devices. Materials and methods. Functional parameters (i.e., task completion time and error rate) of each device were assessed by 10 participants using standardized software based on Standard No. ISO 9241-9:2000. Comfort evaluation was also undertaken for each device using the visual analogue scale technique. Statistical analysis including the Wilcoxon signed-rank test and the Friedman test was performed using SPSS version 16. Results. The functional parameters of the standard mouse were better than those of the other devices. However, no significant difference was observed between this mouse and Ergomice. Overall comfort evaluation showed that the standard mouse and Ergomice were more comfortable to work with. The comfort level of hand/wrist posture in the Ergomice was higher than that of the other three devices. Conclusion. The design features of Ergomice could improve its functional properties. Hand/wrist posture comfort of Ergomice was judged to be high compared with that of the other devices.

Examining RULA`s Postural Scoring System With Selected Physiological and Psychophysiological Measures

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Fountain L. J. K.

International Journal of Occupational Safety and Ergonomics

2003

tom Vol. 9, No. 4

383--392

The Rapid Upper Limb Assessment (RULA) survey is a posture-sampling tool used specifically to examine the level of risk associated with upper limb disorders of individual workers. This paper examines the relationship between RULA’s postural scoring system and measures of surface electromyography (EMG), self-reports of discomfort, and job attitude questionnaires. Twenty participants each performed a 30-min typing task on a computer in 3 working postures based on RULA’s scoring system. A statistically significant difference was found only in perceived discomfort. The perceived discomfort results demonstrated that RULA was able to identify “high risk” postures. The next question we need to ask is, does perceived discomfort result in tissue damage, or does tissue damage yield discomfort?