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Article title MECHANISMS OF POSTURAL STABILITY IN ATHLETES DURING FATIGUE AFTER AEROBIC EXERCISE
Authors A.A. Melnikov, S.G. Popov, A.V.Borisov
Section SECTION II. EQUIPMENT ROOMS AND SOFTWARE OF FUNCTIONAL DIAGNOSTICS AND THERAPY
Month, Year 09, 2012 @en
Index UDC 612.13
DOI
Abstract The orthostatic tolerance prior and in fatigue after prolonged aerobic exercise in athletes (n=32) were studied. The orthostatic tolerance were determined in base on reactions of peripheral hemodynamics’ indexes (peripheral regions: “legs”, “hands”, “head” and “abdomen”) to tilt-test prior and 10 min after standard 45-min bicycle exercise at intensity (heart rate=145 bit/min). Prior to exercise athletes with higher physical work capacity had an increased tolerance to orthostatic stress. A lower tachycardia and a higher rate of a decrease of impedance index of systolic blood volume (SBV) in legs, hands and abdomen regions of body, and a lower rate of a decrease of SBV in head were obtained in athletes. At fatigue after aerobic exercise the reactions of SBV in head, hands and abdomen to tilt-test were similar between athletes and controls, but SBV in legs decreased also more significantly in athletes as prior to exercise. We suggest that the equal reactions of peripheral hemodynamics indexes in response to orthostatic stress after higher intensity physical work and a higher loss of body fluids indicated to higher capacity to preserve orthostatic tolerance in athletes at fatigue regardless of a higher dehydration of body evoked physical exercise.

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Keywords Orthostatic tolerance; tilt-test; fatigue; athletes.
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