[Bases of the integral indicator in the determination of the category of work intensity].

Physiologic and clinical examination of mental workers (19 occupational groups) helped to justify and calculate integral parameter evaluating the work intensity, to determine 6 categories of work intensity. Physiologic and clinical data prove that higher integral parameter of work intensity (category of work intensity) correlates with higher degree of strain at work and higher share of the diseased individuals. The results help to improve classification of hygienic criteria for evaluation of work conditions, in particular the work intensity.