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Abstract
The heart rate in rats exposed to a constant magnetic field 30 min a day for 14 successive days was examined. The animals were fixed between the poles of an electromagnet producing a DC field vertically oriented in the region of the animal's head and spine. The electrocardiogram of each animal was taken during the exposure and during the next 60 min. The heart rate was calculated every 3 min. It was found that a DC magnetic field of relatively high intensity (0.7 T) significantly increased the heart beat in the experimental animals compared to controls.