title: AN INSTRUMENT FOR SIGNALING HEART RATE TO UNRESTRAINED HUMAN SUBJECTS.
mesh_terms: D004562:Electrocardiography; D004864:Equipment and Supplies; D005246:Feedback; D006321:Heart; D006339:Heart Rate; D006801:Humans; D010827:Physiology; D011603:Psychophysiology
keywords: ELECTROCARDIOGRAPHY; EQUIPMENT AND SUPPLIES; FEEDBACK; HEART; HEART RATE; PHYSIOLOGY; PSYCHOPHYSIOLOGY