Abstract
This paper applies catastrophe modeling to fatigue resulting from physically demanding work. It is shown that the cusp model is essentially the same as a mathematical model for behavioral fatigue originally proposed by Ioteyko (1920, La fatigue [Fatigue] (2nd ed.), Paris: Flammarion). The test of the model was nested in a standard personnel selection problem involving 129 employees of a Midwest manufacturer. Dynamometer measurements of arm, back, and leg strength were collected before and after a simulated task sequence, along with measurements of height, weight, body fat, and exercise habits. The cusp model for arm strength was substantially more accurate than linear modeling alternatives. Several variables were implicated in the process. The results argue in favor of the proposed paradigm for studying fatigue.
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