Cranes operators are exposed both to active and passive influences during work. Work positions of the operators, who were put through examinations, differed in a degree of complexity, therefore also in a degree of susceptibility to stress connected with the executed activities. Examinations were carried out for operators manning three kinds of cranes: teeming crane, repair crane and ingot mould stripper crane. The Holter technique and psychophysical tests according to the so-called Dortmund List were use