title: [Variation pulsimetry in evaluating the effect of permanent magnetic fields on cardiac activity].
abstract: By variation pulsimetry changes in the cardiac rhythm of 30 rats exposed to a constant magnetic field (CMF) were examined. Three stages different in statistical parameters were distinguished: transient process when the electromagnet is turned on; shift of variation curves of the cardiac intervals to the right and development of bradycardia during exposure to CMF of 0.4 T (10-30 min) and 1.6 T (3 h); adaptation and rearrangement of the cardiac rhythm towards a higher frequency during and after 24 h exposure to CMF of 1.6 T. In some cases atropine prevented bradycardia during CMF exposure. In most rats under nembutal anesthesia the exposure caused an opposite effect, i.e. shift of variation curves of the cardiac intervals to the left and increase in heart rate.
mesh_terms: D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001919:Bradycardia / Q000503:physiopathology; D004562:Electrocardiography; D006339:Heart Rate / Q000187:drug effects; D008280:Magnetics; D008297:Male; D008722:Methods; D010424:Pentobarbital / Q000494:pharmacology; D011674:Pulse / Q000187:drug effects; D051381:Rats; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D001285:Atropine; D010424:Pentobarbital
vernacular_title: Variatsionnaia pul'sometriia v otsenke vliianiia postoiannykh magnitnykh poleĭ na serdechnuiu deiatel'nost'.