. Bulletin of the University of Wisconsin. Science. llfobL. _il. lUfifl UdlMiUillMiL _ i Fig. 5.—Showing ergographic tracings (1) in voluntary effort, (2) in electrical stimulation of nerve, (3) in electrical stimulation of muscle. (Scripture1 after Mosso.) The relative heights of the tracings represent the relative amounts of energy expended in the several forms of stimulation. It can be seen that in voluntary effort the subject gradually loses power of exer- tion and is soon unable to exert any force whatever; but if at this point a nerve leading to the muscle which has been acting (in this
. Bulletin of the University of Wisconsin. Science. llfobL. _il. lUfifl UdlMiUillMiL _ i Fig. 5.—Showing ergographic tracings (1) in voluntary effort, (2) in electrical stimulation of nerve, (3) in electrical stimulation of muscle. (Scripture1 after Mosso.) The relative heights of the tracings represent the relative amounts of energy expended in the several forms of stimulation. It can be seen that in voluntary effort the subject gradually loses power of exer- tion and is soon unable to exert any force whatever; but if at this point a nerve leading to the muscle which has been acting (in this instance the middle finger was exercised) be excited by electricity, the tracings show that the muscle is as vigorous as ever. The fatigue in the voluntary effort must then have been central or mental. Again, if when action ceases from nerve excitation the muscle be directly stimulated there is once more a re- turn of power, indicating that the muscle itself fatigues much more slowly than the nerve mechanisms concerned in voluntary Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Wisconsin. Madison, Wis. : The University
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