Objectives The objective of this work was to determine whether facial skin symptoms are reduced by decreasing static and low-frequency electric fields produced by visual display units.
Methods The electric fields were reduced by electric-conducting screen filters.
Twenty subjects took part in the study while working at their ordinary jobs, first two weeks without any filter, then two weeks with an inactive filter and two weeks with an active filter (or in reversed order).
The inactive filters were identical to the active ones except that the ground cable was cut.
Measurements showed that the inactive filters reduced the static electric fields nonsignificantly less than the active filters.
For extremely low-frequency fields the difference was greater, and the active filters reduced the very low-frequency fields significantly more than the inactive ones.
Results Most symptoms were less pronounced with active filters than with inactive filters.
The differences were small, and for one symptom only, tingling, pricking or itching, the result was statistically significant.
The recorded physical and psychosocial factors did not explain the reduction with the use of active filters.
Days with a long period spent near a visual display unit resulted in significantly more pronounced symptoms than days with short time.
Conclusion The results weakly support the hypothesis that skin symptoms can be reduced by a reduction of electric fields.
Mots-clés Pascal : Champ électromagnétique, Ecran visualisation, Ordinateur, Exposition professionnelle, Homme, Peau pathologie, Temps exposition, Système film écran, Face, Etude double insu, Toxicité, Prévention, Médecine travail
Mots-clés Pascal anglais : Electromagnetic field, Display screen, Computer, Occupational exposure, Human, Skin disease, Exposure time, Screen film system, Face, Double blind study, Toxicity, Prevention, Occupational medicine
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0566677
Code Inist : 002A08E. Création : 01/03/1996.