A correlation between ergonomics, quality of work environment and workers fatigue

The paper presents a result of statistic estimation of the correlation between ergonomics quality of work environment factor (EQWE) and workers fatigue, that has been calculated with Cumulative Fatigue Index (CFI). The research has been conducted for 124 welding posts, where various technology of welding were used. The correlation has been determined with the help of least square method. The best curve fitting has been given in parabola (the coefficient non-linear correlation was 0,747). Furthermore, the confidence region for the determined curve has been calculated. The results of research conform the psychophysical power law ( Stevens 1957,1960), that describes perceptual continua on which the psychological (subjective) magnitude is the power function of the physical stimulus magnitude. However, it should be noted that the nature and magnitude of the complex relationship between the subjective perception of job strain have not been fully explored yet.