title: Ballistocardiographic studies of the effects of mild exercise on the hearts of very old people.
mesh_terms: D000368:Aged; D001450:Ballistocardiography; D001794:Blood Pressure; D005260:Female; D006321:Heart / Q000502:physiology* / Q000503:physiopathology; D006331:Heart Diseases / Q000503:physiopathology; D006801:Humans; D008297:Male; D005082:Physical Exertion; D011674:Pulse