[Characteristics and definition of stress in subjects exposed to video display terminals: evaluation of urinary excretion of catecholamines and euglobulin lysis time in a group of VDT operators].

Occupational stress is defined and the main problems involved in the study of stress in VDT operators are pointed out and discussed. A preliminary research is presented, in which urinary catecholamines and fibrinolysis are tested in a group of VDT telephone operators. Basal values are compared with data obtained after a work shift. No evident difference appears from this evaluation.