The number of German sports physicians grew steadily, in 1927 2,500 were already registered. At the fifth German Congress for Sports Medicine in Berlin, where Professor Walter Schnell (1891-1960) was elected as the new president, sports physicians from twelve different countries were registered. During the congress it was officially established that doping is a health and sporting morality hazard.
Berlin Professor Surgery Wilhelm Baetzner (1879-1964) published 'Sportschäden am Bewegungsapparat', which he embellished with 28 illustrations.
Dutch physician Herman Reijs (1883-1948) founded the first sports inspection agency in 1927. Soon more followed and they joined on May 2, 1930 in the Federation of Bureaux for Physicals.
In the United States, the appointment of David Bruce Dill (1891-1986) as director of the Harvard Unversity Fatigue Laboratory was a huge step forward in human physiology research. Until then, he had become famous for his investigation of crocodile blood. He was also elected president of the American Physiological Society.
The company of German instrument builder Albert Dargatz (1857-1941) manufactured the device for measuring gas exchange, which was developed and frequently used by German Professor of Sports Medicine Hugo Wilhelm Knipping (1895-1984).