For the 1931 edition (Bainbridge, 1931) of Bainbridge???s original monograph (Bainbridge, 1919), edited at A. V. Hill???s request by the American physiologists A. V. Bock and D. B. Dill, includes the following statement: ???There appear, however, to be two types of fatigue, one arising entirely within the central nervous system, the other in which fatigue of the muscles themselves is superadded to