In recent years there have been numerous studies dealing with the effect of exercise on patients with heart disease. These studies have dealt almost exclusively with single acute experiments. While it is generally assumed that training increases one's capacity for work through the development of skeletal muscles, heart and lungs and better coordination of movements, so little is known about the effect of repeated exercises on patients with heart disease that there is a pronounced difference of opinion among cardiologists as to how harmful or beneficial such exercises are. The facts are few. The results of experiments with single exercises are not applicable. It was thought that by repeating a certain form of exercise over a period of several weeks, differences between people with normal hearts and those with diseased hearts, which were obscured in single exercises, might make themselves manifest. This refers only to patients with no evidence of
PROGER SH, KORTH C. EFFECT OF LIGHT MUSCULAR TRAINING ON PATIENTS WITH HEART DISEASE: RHEUMATIC HEART DISEASE; CHANGES AT REST AND DURING EXERCISE. Arch Intern Med (Chic). 1935;55(2):204–226. doi:10.1001/archinte.1935.00160200034003
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