On page 24 of 'A respiration calorimeter for the study of disease' by American physiologist and nutritionist Graham Lusk (1866-1932) one chapter was devoted to 'Clinical Calorimetry'.
A design for a stress test, as it was published on page 32 in 'Energy transformations during horizontal walking' by American physiologist Frances Gano Benedict (1870-1957).
In the contribution 'The determination of the circulation rate in man at rest and in work' by Walter M. Boothby (1880-1923), which appeared in the American Journal of Physiology, a photograph of the composition for exercise tests was published, in which a 30 liters spirometer was used.
The ergometer designed by Danish Professor of Physiology August Krogh (1874-1949) and produced by Copenhagen Electric Motor Factory.
French Gérald Joseph Macaura invented the Pulsocon, a mechanical, manual and vibrating massage machine.
The device was meant for the head, the skin and the whole body. Macaura was sentenced to three years in prison because he posed as a physician while he was not.