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Biomechanical Stresses in Computer-Aided Design and in Data Entry

Cail F., Aptel M.

International Journal of Occupational Safety and Ergonomics

2003

Vol. 9, No. 3

235--255

A study of the risk factors of musculoskeletal disorders (MSDs) of the upper limbs was carried out on 2 populations, 1 performing a computer-aided design (CAD) task and the other performing a data entry task. A questionnaire on MSD complaints and working life was completed by a sample of each population. Biomechanical measurements of the forces, the angles, and the repetitiveness of movements of the upper limbs were carried out on some operators in each sample. It emerged that complaints of the upper limbs seem to be linked to the use of input devices. The grip forces exerted when using the keyboard and mouse were higher in CAD than in data entry.

Evaluation of Grip Force Using Electromyograms in Isometric Isotonic Conditions

Claudon L.

International Journal of Occupational Safety and Ergonomics

1998

Vol. 4, No. 2

169--184

The purpose of this study was to develop a relationship to evaluate the grip force (forcerel) using the electromyogram (EMGrel) of the flexor digitorum superficialis (FDS) and of the extensor digitorum (ED) according to the flexion-extension wrist angle (0t-e) and to the pronation-supination forearm angle (0p-s). Fifteen participants had to exert 3 levels of grip forces in 4 positions of the wrist combined with 3 positions of the forearm. The relationship is: forcerel = 0.0045 • 0t-e • EMGrel(FDS) + 0.48 • EMGrel(FDS)-0.0014 • 0t-e • EMGrel(ED) -0 .0016 • 0p-s • EMGrel(ED) • 0.4- EMGrel(ED) This relationship can be used to estimate grip force for levels of strength lower than 50% of the maximal voluntary contraction.