Each organism at an individual level builds its system of temporary relationships with the different amplitude of oscillations - an individual biorhythmological portrait. Using Holter monitoring in the AnnaFlash2000 software in the ISCIM6 statistical processing, the ultradian rhythms of the driller crew in extreme northern latitudes studied. It revealed that the individual rhythmic processes of acrophase and cardiac rhythm bathyphase, which testify to the leading role of hypoxia, hypercapnia in adaptive mechanisms, influence the joint professional activity of small labour groups. It established that working in different biological rhythms, the driller’s team has a low degree of compatibility. The synchronization of biological rhythms in the team is achieving by the general properties of temperament as phlegmatic. More successful in adaptation - phlegmatic sanguine.

The emergence of the COVID-19 pandemic has led to the transition of educational organizations to self-isolation and distance learning. Once in the new conditions, it was necessary to adapt to the fact that the training format had changed. One of the important tasks for us was to study students’ health and the peculiarities of their adaptation to the acquisition of knowledge and skills using information and communication technologies remotely. Based on Ryazan State University, studies carried out aimed at studying the adaptation and mental health of students to the conditions of distance learning during the period of COVID-19 in terms of ultradian rhythms of the cardiovascular system using the Belgian test “Reaction of the cardiovascular system to load in the form of inclinations torso. “ The obtained biorhythmological data of health status according to the Belgian test showed that the health status of students in the conditions of distance learning in connection with the COVID-19 pandemic and selfisolation corresponded to the working state. Distance education satisfied introverts, not extroverts.

The paper provides a biorhythmological assessment of the health of a driver’s team in conditions of joint activity in terms of heart rate variability. Measurements were taken during the working day using Holter monitoring in AnnaFlash2000 software and statistical processing ISCIM6. The cardiogram of the heart was recorded during the working day from 8.00 to 18.00 hours. It was revealed that the rhythmic processes of acrophase and heart rate bathyphase, which testify to the leading role of hypoxia, hypercapnia and desynchronosis of ultradian rhythms, influence the joint professional activity of drillers. The examined drivers found a violation of the synchronization of biological rhythms and desynchronosis at various levels of regulation of heart rhythm regulation. Both drivers, working in different biological rhythms, have a low degree of compatibility and belong to the group of production risk, which negatively affects occupational safety.