Biological effects of pulsed electromagnetic radiation emitted by cathodic tubes on human adults
V. Martin-Baumgartner (1), Laverdure, A.M., and J. Surbeck

(1) Médecin du Travail, Membre de la CIST/ICOH

Presented at the 10th Congress on Occupational Health Services, ICOH Scientific Committee on Health Services, Research and Evaluation in Occupational Health, Amsterdam, Pays Bas, 13-16 November 2002

Final Programme / Abstract Book


Human users distributed in 4 clusters were exposed in front of a Video Display Terminal (VDT) for studying the urinary concentrations of Na+/K+ and urea before and during working. Measured electric and magnetic fields were 13V/M amd 50nT, respectively. An experimental apparatus has been developed and tested here that aims to prevent the harm from VDT radiation.

After 4 hours in front of a nude screen or of a placebo-equipped screen, an inversion of Na+/K+ ratio and of urea urinary eliminatory curve appeared. After 8 hours of exposure, a 35% of Na+/K+ ratio decreasing and a 13% of urea concentration increasing have been observed. The measured parameters showed no difference in unexposed control people or after exposure in front of the screen equipped with the experimental protective apparatus.

These observations indicate a modification of the normal polarizing status of the cell membrane, of the ionic exchanges through the membrane, and of the cellular metabolism. VDT radiation acts as a cell membrane depolarizing factor stimulating the local and then the general sympathetic nervous system. Symptoms of an insidious stress appear, which can be considered as the origin of the biological, physiological and neuro-psychological perturbations currently described in workers. A causative bond between the biological perturbations and the pulsed VDT radiation is demonstrated. The efficiency of the protective apparatus is verified. Known commercially as the EMF-Bioshield® system from S.E.I.C. (ISO 9001 qualified for Research and Development), it insures an effective protection against harmful biological effects of VDT radiation.

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