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CARDI ORES PIRATORY PREDI CTORS FOR MAXI MAL LOAD TEST TERMINATION IN PROFESSIONAL CROSS-COUNTRY SKIERS

N. G. VARLAMOVA (1), T. P. LOGINOVA (1), N. A. MARTYNOV (1), A. A. CHERNYKH (1), I. A. RASTORGUEV (1), I. O. GARNOV (1), V. E. LARINA (2), E. R. BOYKO (1,2) 1 -INSTITUTE OF PHYSIOLOGY OF KOMI SCIENCE CENTER OF THE URAL BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES, SYKTYVKAR, RUSSIA 2 -SYKTYVKAR STATE UNIVERSITY, SYKTYVKAR, RUSSIA

Objective: To identify early predictors of the completion of cardiorespiratory exercise test before failure in highly skilled skiers-racers. Materials and methods: We examined 13 cross-country skiers (aged 20–29, total 27 tests), who were members of Komi Republic’s and Russian National teams. As a part of each examination maximal physical load tests using ergospirometry system «Oxycon Pro» were performed. Parameters cardiorespiratory systems were monitored and recorded before, during and after the tests.
Results: We analyzed 17 cardiorespiratory parameters in professional crosscountry skiers. The most labile (increase over 1000%) were: respiratory minute volume, oxygen uptake, exhaled carbon dioxide. Moderately labile indices (increase by 100–500%) were respiratory volume, heart rate, oxygen pulse and systolic blood pressure. Least labile indices (increase or decrease by up to 10%) were ratio of respiratory residual respiratory volume, diastolic blood pressure and oxygen utilization coefficient. During last minute of maximal load test in professional ski-runners we observed decrease of respiratory volume, oxygen utilization coefficient, oxygen blood saturation. Also at the same time we found decrease of respiratory function and alveolar ventilation effectiveness.
Conclusions: The results of the analysis showed following factors to be the predictors for the pre-emptive (before voluntary exhaustion stoppage of the test) test termination: the lack of an oxygen pulse growth, oxygen utilization coefficient drop to 29 ml/min, oxygen blood saturation drop by 10%, respiratory quotient increase up to 1.05, and systolic arterial blood pressure increase higher than 200 mm Hg.
Keywords: 
skiers; cardiovascular and respiratory system; whose maximum load; the load predictors of the completion.