Mental fatigue : a comprehensive exposition of the nature of mental fatigue, of the methods of its measurement and of their results, with special reference to the problems of instruction / by Dr. Max Offner tr. from the German by Guy Montrose Whipple.
- Offner, Max, 1864-1932.
- Date:
- 1911
Licence: Public Domain Mark
Credit: Mental fatigue : a comprehensive exposition of the nature of mental fatigue, of the methods of its measurement and of their results, with special reference to the problems of instruction / by Dr. Max Offner tr. from the German by Guy Montrose Whipple. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![The dynamometer. The decrease of muscular force, more exactly, of ''the work that can be done by the muscle under voluntary contraction (Eulen- berg, 601), is a purely physiological symptom not only of bodily, but also of mental fatigue, as we have already shown. J. Loeb (1886) seems to have been the first to investigate ''muscular activity as a meas- ure of mental activity. Soon afterwards (1890) A. Mosso published his studies, TJeher die Gesetze der Ermudung [On the Laws of Fatigue], and his well-known book, ''La Fatica'' (1891), translated into German in 1892 [and into English, FatigTie, 1904]. Up to that time the Collin dynamometer had been used for measuring muscular strength. This instrument consists of a steel oval, which, when gripped with the hand, indicates by a pointer the pressure in kilograms exerted by the hand. Ul- mann's dynamometer is another form that can be used either for measuring pressure or traction. These measurements that are secured by the use of dynamometers possess, however, little accuracy, in especial because the subjects are by no means apt to exert in an equal degree all the muscles concerned, so that when fatigue arises they may easily shift the groups of muscles and introduce into the later meas- urements groups of muscles that had relatively little](https://iiif.wellcomecollection.org/image/b21211632_0035.jp2/full/800%2C/0/default.jpg)
