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Document ID (ISN)102911
CIS number 03-1953
ISSN - Serial title 0355-3140 - Scandinavian Journal of Work, Environment and Health
Year 2002
Convention or series no.
Author(s) Laursen B., Jensen B.R., Garde A.H., J°rgensen A.H.
Title Effect of mental and physical demands on muscular activity during the use of a computer mouse and a keyboard
Bibliographic information Aug. 2002, Vol.28, No.4, p.215-221. Illus. 26 ref.
Abstract Twelve female subjects performed a computer task with four combinations of two types of input device (mouse and keyboard) and two levels of mental demand (with and without a Stroop colour word test). The time available for response was limited. Performance and electromyography (EMG) were recorded for the forearm, shoulder and neck muscles. All the muscles for which recordings were made showed increased muscular activity in the mentally demanding condition. The increase in the static muscular activity level varied from 0.3% of the maximum EMG for the right trapezius muscle to 2.6% for the extensor carpi ulnaris muscle. In conclusion, mental demands during computer work increased muscular activity in all of the recorded muscles. Increased muscular activity was found in the neck during the use of the mouse in comparison with the use of the keyboard. This phenomenon may be related to higher visual demands during the use of a mouse than with a keyboard. These findings may help explain the adverse effects of psychosocial work factors on the musculoskeletal system.
Descriptors (primary) muscular work; mental workload; mental stress; man-computer interfaces; office work
Descriptors (secondary) static muscular work; measurement of load on muscles; comparative study; women; electromyography
Document type D - Periodical articles
Country / State or ProvinceDenmark
Subject(s) Ergonomics and work organization
Broad subject area(s) Physiology, ergonomics
Browse category(ies) Mental stress and burnout
Office work
Mental workload