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Abstract
We investigated the influence of the external time-varying component of the natural geomagnetic field–geomagnetic activity–on the degree of the 0.2 T static magnetic field (SMF) hypotensive effect. We showed previously that 0.2 T SMF applied to the carotid sinus area of anesthetized rabbits had a hypotensive effect under norepinephrine-induced hypertensive conditions (1).
We found that the degree of the 0.2 T SMF hypotensive effect depends on the level of the geomagnetic activity at the time of the experiment and is maximal for days with disturbed geomagnetic activity.
We concluded that in the evaluation of artificial electromagnetic fields biological effects, geomagnetic field activity must be taken into consideration, because of a possible modulating effect.