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Those familiar with the previous editions of this book will welcome the new edition, in which the work has, indeed, been "thoroughly revised." The chief differences between the present and previous editions will be found in connection with exercise as a test, and in the treatment of diseases of the circulation, in which an extensive experience during the war with the so-called "soldier's heart" has given the author still greater confidence in the value of exercise in these conditions than he dared to express before. It has been found that "murmurs, especially systolic, were almost valueless as a basis for prognosis.... Displacement of the apex was an untrustworthy guide.... Reliance was placed on distress, rapid action with slow return to normal, and precordial pain after exercise. Exercise proved to be the only sound clinical test of the heart's ability to perform its work. It was shown that irregularities and intermittence
Exercise in Education and Medicine. JAMA. 1923;80(24):1794. doi:10.1001/jama.1923.02640510050037
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