It is the individual aerobic energy generation ability that is a key for the working capacity in modern cross country skiing since the bodily energy costs including those covered by the anaerobic energy sources are eventually connected with the oxidizing phosphorylation. The study was designed to obtain and analyze the blood flow (haemodynamic) rates indicative of the racing skiers` adaptation process efficiency under physical load. Subject to the study were 18-23 year-old male racing skiers (n=17) grouped as follows: Group 1 was composed of the individuals with RUS points under 67.89 in the racing events; and Group two of the skiers having RUS points in excess of 73.22. For the purposes of the study, the sample was tested using a bio-impedance tetrapolar reopolygraph and a blood analyzer system. The negative chronotropic and positive inotropic effects in Group 2 were indicative of the dominant role of the stroke volume in the blood flow control and better heart adaptability to the physical loads. It was also found that the low resting central venous pressure rates varying at 63.86 mm Hg enabled trained racing skiers to keep their performance under 67.89 RUS-points in the racing events as reported by the Russian Cross Country Skiing Federation rating database.
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