[Characteristics of sleep and locomotor activity in night shift workers].

Shift work and night work in particular, account for numerous disturbances in circadian biological rhythms of physiological activities. Shift workers most frequently complain of sleep disturbances manifested among others by sleep duration and quality, as well as by time of proper sleep and naps. Among methods used for the sleep assessment, subjective tests: sleep value questionnaires and 24-h EEG, are most common, however actigraphy is recently considered to be more useful.

Circadian rhythm of heart rate, urinary cortisol excretion, and sleep in civil air traffic controllers.

The examination of Air Traffic Controllers (ATCs) from the Warsaw Airport (Poland) included 24-hr ECG monitoring. The participants were 10 civil ATCs, 9 males and 1 woman. The study was carried out on a group of 19 ATCs during their duty periods, 14 of them working 12-hr shifts and 5 performing 24-hr duties.

Heart rate variability in exposure to high altitude hypoxia of short duration.

The objective of the presented studies is to attempt an evaluation of heart rate (HR) and heart rate variability (HRV) regulatory mechanisms in the presence of autonomous nervous system (ANS) components in transient exposure to high altitude hypoxia. During 24 hrs including a stay in hypobaria, the participants had their HR continuously recorded using the Holter method. The following parameters were calculated at rest and during the stay in a thermobarochamber: spectral power in low frequency bands (LF) 0.