McGinn, D A reliable and inexpensive technique for recording heart rate in unrestrained unanesthetized rats. [electronic resource] - Physiology & behavior Jan 1977 - 171-2 p. digital Publication Type: Journal Article ISSN: 0031-9384 Standard No.: 10.1016/0031-9384(77)90113-5 doi Subjects--Topical Terms: AnimalsElectrocardiography--methodsElectrodes, ImplantedHeart RateRatsRestraint, Physical