To assess the work load in neck and upper limbs of dentists.
Twelve righthanded female dentists (six with and six without a history of definite neck/shoulder disorders, pair-wise matched for age) were studied when performing authentic dental work.
Electromyography (EMG) was used to quantify the muscular load of the shoulders bilaterally and of the right forearm.
Positions and movements of the head and wrists were measured, using inclinometers and electrogoniometers.
During work, the median load for the right upper trapezius muscle was 8.4% of the maximal voluntary EMG activity (MVE) ; during 90% of the time the load was = 3.3% MVE ( « static » load).
The figures were somewhat lower on the left side (7.0% and 2.5% MVE, respectively).
Subjects with disorders had over all lower load levels for the trapezius muscles, although not statistically significant at<0.05, than those without disorders.
During a standardized reference contraction for the trapezius, the load was 17% MVE, and the quotient between MVE and torque [normalized to maximal voluntary torque (MVC) ] was 0.5. These figures may be used for transformations.
The muscular load on the right forearm was similar to the loads on the trapezius.
The head was, on average, forward tilted =39, and during 10% of the time =49%. (...)
Mots-clés Pascal : Dentiste, Femelle, Personnel sanitaire, Exposition professionnelle, Charge travail, Système ostéoarticulaire pathologie, Douleur, Tête cou, Epaule, Poignet, Electromyographie, Electrodiagnostic, Posture, Muscle trapèze, Muscle strié, Médecine travail
Mots-clés Pascal anglais : Dentist, Female, Health staff, Occupational exposure, Workload, Diseases of the osteoarticular system, Pain, Head and neck, Shoulder, Wrist, Electromyography, Electrodiagnosis, Posture, Trapezius muscle, Striated muscle, Occupational medicine
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0336631
Code Inist : 002B30A05. Création : 12/09/1997.