Electrocardiography in extremity, precordial and frank leads, recorded continuously on magnetic tape during a graded exercise. Experiences from a population  study of about 400 not admitted 70-year old persons.
D000368:Aged; D003718:Denmark; D004562:Electrocardiography; D001330:Electronic Data Processing; D005080:Exercise Test; D006801:Humans; D013637:Tape Recording