[Comparative study of adaptive responses of the cardiorespiratory system in inhabitants of different climatic-geographic regions]

The paper reports the data of comparative study of the cardiorespiratory function in healthy males (19-22 year old) from the countries in Asia, Africa, and Latin America lying within the tropic climatic-geographical zone during acute adaptation to the nature and the climate of the middle zone of Russia. The distinctions in respiration, circulation and gas exchange functions in the natives of different climatic-geographical zones were found as during comparative rest so under the combined effects of hypoxia and hypercapnia induced by the rebreathing test and ascribed to the environmental-genetic constitutional properties of the body and the chronobiological characteristics of the place of abode. Reactivity to the combined effects of hypoxia and hypercapnia in different groups is predominantly a function of unequal contributions of hemodynamics and pulmonary ventilation. A relatively low effectiveness of the cardiorespiratory system in representatives of the South-East Asia during acute adaptation was established. These results demonstrate the benefits of the hypoxic-hypercapnic test for determining functional potentials of the cardiorespiratory system in the context of adaptation to a new environment.