Introduction: Nowadays every second is very important in high performance sport. Equipment of leading countries is the same therefore the most important part of win is training and abilities of athletes. In cross-country skiing key ability is endurance which is considerably defined by hemodynamic characteristics. Methods: Thirteen well-trained skiers (men) were included in the study. The subjects` age was from 15 to 17. Each subject was well rested before testing and had not performed hard physical work during the previous 24 hours. In our investigation we used hemodynamic monitor of anesthesiologist and chosen the most important indicators such as heart rate, stroke volume, ejection fraction, cardiac output, stroke index, cardiac index, end-diastolic volume, end-diastolic index, index of left ventricle work and stroke index of left ventricle work. In measurement all athletes were at rest in the supine position. We used «STATISTICA 10» for statistical analysis. Results: We described norms (mean ± standard deviation) for each indicator in our group. Then we held correlation analysis between indicators and performance according to rating of skiers in Sverdlovsk-region (Russia). Statistical analysis showed significant correlation between athletes` performances and stroke volume (r = -0.77; 122±22ml), cardiac output (r= -0.61; 6.8±1.6 l), end-diastolic volume (r = -0.76; 193±34ml), stroke index (r = -0.82; 69±11ml/m2), heart index (r= -0.65;3.9±0.9l/m2), end-diastolic index (r = -0.81; 110±17ml/m2) and stroke index of left ventricle work (r = -0.62; 74±14). No correlation between performance and heart rate (57±8beats/min), ejection fraction (63±2%) and index of left ventricle work (4.2±1.0). Discussion In our study the most of indicators are important for win in cross-country skiing. Such indicators as stroke volume, cardiac output and diastolic volume showed athlete`s conditions and they might be predictors of competition results. But these indicators don`t take into account body size of athlete therefore and different indices (stroke index, heart index, end-diastolic index and stroke index of left ventricle work) are calculated with previous indicators value and body surface area in some cases can be truer. Such indicators as heart rate, ejection fraction and index of left ventricle work don`t have correlation with performance however they show a heart work quality and can be good indicators of overexertion.
© Copyright 2014 19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. - 5. July 2014. Julkaistu Tekijä VU University Amsterdam. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator