title: [Frequency-dependent effects in an alternating electric field on an isolated frog heart].
abstract: An isolated frog heart placed in a special chamber with Ringer solution (pH 7.2) was stimulated by electric field at a frequency of 0.3-4.0 Hz with graphite electrodes immersed in the solution. Unusual resonance phenomena were observed during a progressive increase or decrease of the stimulation frequency: the amplitude of the mechanical responses of the preparation rose at multiple frequencies of stimulation, whereas the frequency of the responses remained unchanged.
mesh_terms: D000818:Animals; D004558:Electric Stimulation; D004574:Electromagnetic Fields; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D009200:Myocardial Contraction; D011896:Rana temporaria
vernacular_title: Chastotozavisimye éffekty v znakoperemennom élektricheskom pole na izolirovannom serdtse liagushki.