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Biomedical subjects

A E Severin

Publications and source records attributed to A E Severin.

8 recordsLinked to original sources
PubMed1995

[Ecology, adaptation and biorhythms].

The interfusion of environmentology and chronobiology makes it possible to explore various physiological mechanisms which arose in the process of evolution as a response to the external challenges. Therefore, a living organism adapts to a changing situation on the environmental and evolutional time scale. Since the temporal structure of environment is rhythmic by nature, body parameters may be strongly dependent on the environmental factors during adaptation. Results of the in-depth environmental and physiological studies of representatives of different climatic-geographical regions pointed to a series of common and individual properties of the human body reaction to an environment. The combination of hypoxia and hypercapnia (rebreathing test) brought into light a relationship of the reciprocal reaction of respiration and circulation to the body mass index and the average annual temperature in a region. The higher the temperature, the lower the body mass index, the weaker the hemodynamic reaction and the more expressed the ventilatory reaction.

Adaptation, Physiological↗
PubMed1995

[The ecological conditions in the Aral Sea area and the functional reserves of the human body].

The authors give their judgment of the cardiorespiratory status of the population in the ecologically disaster area to the south of the Aral. The data from examination of various age groups of the native population inhabiting eco-varying regions are published. The authors make a conclusion about an important role of environment in formation of the bronchopulmonary system.

Adolescent↗
PubMedDate not supplied

[Gas exchange and physical work capacity of natives of different geographical regions].

A study was carried out to investigate exercise tolerance, gas exchange and external respiration of Latin-American students who lived in Moscow for a year. As controls Soviet students residing in and around Moscow were used. The above parameters were measured at a different time of the day in response to a hypercapnic exposure. Exercise tolerance was determined using the test PWC170. External respiration and gas exchange were investigated at rest and during 5 min exercises with a load of 1 and 2 Wt/kg body weight. CO2 sensitivity was determined by means of the rebreathing method. In the evening the Latin-American students showed a trend towards an increase of the cardiorespiratory activity and exercise tolerance. The Soviet students did not display changes in exercise tolerance. The Latin-American students showed an increase in the morning and a decrease in the evening of external respiration reactions. The Soviet students exhibited opposite variations. Direct alveolar measurements demonstrated an increase of pCO2 in the alveolar air in the Latin-American students in the evening and a decrease of the parameter in the Soviet students. It is suggested that cyclic changes in external respiration in response to hypercapnia are associated with exercise tolerance.

Adaptation, Physiological↗