title: A method of e.c.g. recording on free ranging subjects.
mesh_terms: D003203:Computers, Hybrid; D004562:Electrocardiography / Q000295:instrumentation*; D006339:Heart Rate; D006801:Humans; D008991:Monitoring, Physiologic; D009051:Mountaineering; D005082:Physical Exertion; D013177:Sports; D013637:Tape Recording