McKenzie [Footnote: McKenzie: Am. Jour. Med. Sc., January, 1913, p. 69.] found that exhausting tests of endurance were not adapted to the development of children and youth, because the high blood pressure caused by such exertion soon continued, and he found athletes to have a prolonged increased blood pressure. As is recognized by all, boat racing is particularly bad, especially the 4-mile row. Such severe exertion of course increases the blood pressure, even in these athletes, and the heart increases its speed. There is then exhilaration, later discomfort, and soon, as McKenzie points out, a sensation of constriction in the chest and head. This is soon followed by breathlessness, and soon by a feeling of fulness in the head, and then syncope. The heart, of course, becomes dilated. Heart murmurs are often found after much less severe exertion than boat racing. They may not last long, or they may disappear under proper treatment. He reported that after exercise there were heart murmurs in seventy-four of 266 young men who were in normal health, and that nearly 28 per cent of all normal young men will show a murmur after exercise. He thinks that it is rare to find, after a week, a heart murmur in a previously healthy heart, if the athlete has not passed the age of 30. There can be no doubt that even one, to say nothing of more, such heart strains is inexcusable and may leave a more or less lasting injury. Such heart strains and exertions are not entirely seen in athletes. A man otherwise well may cause such a heart strain by cranking his automobile, by pumping up a tire, by strenuous lifting, by carrying a load too far or too rapidly, or by running, and an elderly man may even cause such a heart strain by walking, hill climbing, or even golfing, if he does these things. More or less acute dilatation occurring in such persons is likely to recur on the least exertion, unless the patient takes a prolonged rest cure and the heart is so well that it recuperates perfectly. Any chronic myocarditis, however, may prevent such a heart from ever being as perfect as it was before. Torgersen, [Footnote: Torgersen: Norsk Mag. f. Laegevidensk., April, 1914.] after making 600 examinations of 200 athletes, and 1,200 examinations of members of the rowing crew, decides that it is absolutely essential that there should be skilled daily examinations of every man during training, and a record kept of the condition of his heart, urine, and blood pressure, before and after exercise. When he found albumin in the urine it was always accompanied by a falling of the blood pressure and a rapid heart, with loss of weight and a general feeling of debility.