[Changes in the physiological and biochemical parameters of students during an examination].

During exercises /control/ and examination on work psychology /experiment/ were investigated the cardiac frequency, blood supply of extremities, peripheral vessel tone, velocity of pulse wave spreading, EKG, pulse variety, skin resistance, excretion of adrenaline, noradrenaline, 11-OCS and other parameters. It was established that an examination is a good model of studying the changes during stress. Characteristic intersexual and interindividual differences were found.

[Stress reaction to work today].

The characteristic of stress factors at work and their effect upon humans is of great significance in labour optimization, detection of early changes in organism, assessment of the operative MAC and MAN, standardization and categorization of labour, etc. On the base of such studies (biochemical, physiological and psychophysiological) stress and fatigue in various occupations and working regimes are characterized. The results from the studies on stress reactions at work are presented in a summarized way, making use of complex methodical approach.

Changes in the excretion of corticosteroids and catecholamines in tractor-drivers.

An investigation was carried out to study the effect of mechanized agricultural work on the excretion of some corticosteroids and catecholamines in tractor-drivers during a seasonal field work. Group 1 (15 subjects) was examined three times: in the morning hours before starting work and at two intervals during the first and second half of the working day. In group two (11 subjects) the characteristics of the circadian rhythm for 24h were investigated in urine collected at six intervals.

Psychological and biochemical strain in firemen's work.

Mental load and strain in the work of firemen and fire alarm center operators were studied in a group of 260 fireman and 6 female full-time operators from three fire brigades. The firemen proved to be satisfied with their work, and signs of chronic psychological problems were uncommon. Situational work load and related strain may, however, be extreme during active operations.

[Biochemical aspects of the strain of teachers' work].

The study group comprised 20 teachers in the higher course of a secondary school, examined while performing their daily teaching work, and 7 teachers in a national secondary school for classic languages and cultures, where a new intensified teaching program has been established. To evaluate tension and characterize some of its determinants, the authors determined throughout the working day the following parameters: urinary excretion of 11-oxycorticosteroids (11-OCS), 17-oxycorticosteroids (17-OCS), 17-ketosteroids (17-KS), adrenaline (A) and noradrenaline (NA). The influence of age was assessed by determing all these parameters in 5 different age groups.