Twenty-four healthy men in the age of 20 to 50 years participated in a single session of 65 minutes including both magnetic field exposure and sham exposure. Participants had to maintain their index finger in a fixed position. Postural tremor was recorded in the range of 10 seconds before (recording begin) and after (recording end) magnetic field transition.
for further information on the setup see: Nguyen DH., Richard D., Plante M., "Système de génération du champ magnétiques et de commande des essais pour l'étude de l'effet des champs magnétiques sur le système nerveux central et périphérique par l'exploration des tremblements." Hydro-Québec Montréal 2004
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The magnetic field exposure did not cause magnetic field transition effects ("on"/"off"). Heart rate and skin temperature were not affected either.
The "mean sginificant power" of the postural tremor was significantly higher at the beginning of the recording than at the end of the recording, independently of the magnetic field transition and more pronounced in the magnetic field exposure than sham exposure.
These data indicate a relaxing effect of extremely low frequency electromagnetic field on motor control resulting in an attenuation of postural tremor intensity.