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[Effect of climate of arid zone on adaptive and non-adaptive changes in microcirculation].

State of microcirculatory bed of the bulbar conjunctiva and nail wall skin has been studied in 134 men (18-28 years old) of native (62 men) and non-native (72 men) population. It was found out that under heat discomfort the compensation is observed in native population due to the induration of the capillary network, opening of plasmatic capillaries which did not function before, tonus of venules and arterioles being preserved while the amount of "gigantic" capillaries increased. In this case the blood flow was entire, uniform and moderately accelerated. The number of functioning capillaries does not increase in non-native population, but arterioles does not increase in non-native population, but arterioles and venules were dilated, blood flow in them became more rapid, sludge-phenomenon of the I stage being observed in some people. Consequently, the observed changes in microcirculation under heat discomfort are insignificant in the native population due to available structure-morphological potentialities, while in non-native population these changes are accompanied by certain strain at the expense of available functional reserves.

Adaptation, Physiological↗