Fatigue Effects as Measured by Sugar Content of Blood

While believing that his data do not warrant a conclusion as to the influence of different kinds and amounts of activities upon the sugar content of the blood, the author tries to stimulate further investigations of the concepts of fatigue and a reformulation of the factors involved in fatigue effects. The paper contains nine tables, three graphs of work or practice (output) curves, and three figures of the actual work of children in the maze, coördination test, the card-sorting discrimination test, and the Wells-Woodworth substitution (code) test. Tests also in tapping, target hitting, manipulating the adding machine, gripping the dynamometer, and memory span for digits were administered. References are given to twelve pieces of literature dealing with fatigue products in the blood and to practice effects in the various tests mentioned. From Psych Bulletin 20:05:00362.