Biological effects of pulsed electromagnetic radiation emitted by cathode ray tubes on human adults.

V. Martin Baumgartner (1), A.M. Laverdure, and J. Surbeck

(1) Occupational Health Doctor, ICOH/ CIST n° M 3119 "A"
Service Médical THALES, B.P. 57 - F-91229 Brétigny-sur-Orge - France

Presented at the 27th International Congress on Occupational Health (ICOH 2003), Iguassu Falls, Brazil, 23-28 February 2003, FP 39.10., p.139

AIMS: Human users were uninvasively tested for any biological perturbations in their ionic balance resulting from exposure to radiation from Video Display Terminal (VDTs).

MATERIALS AND METHODS: VDTs were powered by a 50 Hz alternating voltage of 220 V. Measured electric and magnetic fields were 13 V/M and 50 nT, respectively. An experimental apparatus has been developed and tested here, that aims to prevent the harm from VDT radiation. 120 volunteer adults distributed in 4 clusters: unexposed, exposed without protection, exposed with protection-placebo, exposed with active protection, were exposed at a distance of 50 to 80 cm in front of a cathodic screen. Na+, K+ and urea (a product of the cellular catabolism) urinary concentrations were measured before and after 4 and 8 hours of working..

RESULTS: After 3 to 4 h of exposure in front of a nude screen or in front of a placebo-equipped screen, an inversion of Na+/K+ ratio and of urea urinary eliminatory curves have been observed. After 7 to 8 h of exposure, a 35% of Na+/K+ ratio decreasing and a 13% of urea concentration increasing have been observed. There was no difference between the Na+/K+ ratio and urea urinary eliminatory curve in unexposed control people or after exposure in front of the screen equipped with the experimental protective apparatus.

CONCLUSION: These observations show an important modification of the normal polarizing status of the cell membrane, an important modification of the ionic exchanges through the membrane and of the cellular metabolism. Pulsed electromagnetic radiation emitted by cathodic screens (PC, TV or video games), act as a cell membrane depolarizating factor stimulating the local sympathethic nervous system and step by step that of all the body cells, placing the body in position of an insidious stress. This stress 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 radiation emitted by the cathodic screen is demonstrated. The total efficiency of the experimental protective apparatus has been 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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