UDC

612.1-057.36:613.13(98)

Authors

Ermolin Sergei Petrovich
Northern State Medical University; Border Department of Federal Security Service of the Russian Federation in the Arkhangelsk Region (Arkhangelsk, Russia)
е-mail: ermolinsergey@mail.ru

Abstract

The paper presents the results of a study of the cardiovascular and muscular systems during the polar day and polar nigh in 20 military aged from 21 to 36 years doing contract military service in the archipelago of Franz Josef Land (80°04′ N, 47°05′ E). To assess the functional reserves of a body the Martin Kushelevsky test was used, the types of responses of the cardiovascular system to the test were analyzed, indices of inotropic and chronotropic reserve were calculated according to the amount of increase of systolic blood pressure and heart rate. To assess the muscle strength the dynamometry was carried out, indices of inotropic and chronotropic reserves and the power index were calculated. During a polar night in 65 % of military a hypotonic type of responses of cardiovascular system to a standard physical activity was observed, index of inotropic reserve of the heart was decreased. During a polar day the more economic normotonic type of response was prevailed. The hypertonic type of response to physical activity is observed in 15 % of examined military both during a polar night and a polar day. Measurement of muscular strength, calculation of a power indexes in military showed statistically significant decrease during a polar night in comparison with the values of a polar day (р = 0,027 and р = 0,022 respectively).

Keywords

the military in Arctic, polar night, polar day, cardiovascular system

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