SIMULATION OF REALIZATION OF SKI-RACERS ’ FUNCTIONAL POTENTIALS IN PASSING SKI TRAILS OF DIFFERENT

Purpose: to substantiate model characteristics of functional fitness components of elite ski-racers, depending on competitions’ conditions. Material: We tested 20 sportsmen of combined team of Ukraine. Results: it was found that climbing hills of different length and steepness is accompanied by certain functional tension of organism and changes in cardio-respiratory system. It influences on effectiveness of further descent and moving on plain. It was also determined that correlation of aerobic and anaerobic efficiency changes according to trail relief. Conclusions: we worked out model characteristics of skiers’ fitness most important parameters, usage of which can facilitate maintaining high special workability on all segments of competition distance. In particular it concerns climbing hills of different steepness.

Organization of the research: model studies were fulfilled on the base of university's laboratory.Testing of special endurance and realization of sportsmen's functional potentials in natural conditions of competition distance passing was carried out at sports training base "Tysovets" (Lvovskaya region).Functional potentials of sportsmen were assessed with complex testing.The testing included ergo metering, speed metering, analysis of respiratory system with the help of gas analyzer «MetaMax 3B» (Cortex, Germany) and pulse metering.Objective measurements of muscular work's characteristics in laboratory conditions were realized with the help of specialized ergo meter with increased area of track Wide Folding Track (POMA, Germany).Application of ergo meter permits to move on skirollers in free style.
In natural conditions we used system of GPS-navigation of HBR telemetric register «Polar RS800» («Polar», Finland), which permitted to register heart beats rate (HBR), speed of distance passing and height above sea level.On the base of these indicators we determined trails' relieves; received the data of sportsman's speed on different parts of distance, power of work and etc.
Statistical analysis: statistical processing of materials was fulfilled with the help of Statistica 10.0 and Exсel 2003, 2007 programs.Confidence of differences between groups was found with Wilkinson's criterion.

Results of the research
The data, received in our research, permitted to find certain dependence of competition functioning's effectiveness indicators on current functional and working state of sportsmen, reflected in model characteristics.
Model characteristics of functional potentials' realization in conditions of simulation of competition distance's passing were worked out on the base of regression models' construction.As a reference value (see The values, given above, do not contain peak values, which are characteristic for climbing hills.They significantly depend on hill gradient (relation of hill length to differential of heights) and height above sea level, as well as on weather conditions.For working out the model of dynamic functional reactions we made a map of trail profile, on which competitions would take place.
The conducted by us researches showed that mean-distance speed at competition distance depended on characteristics of anaerobic metabolism threshold (TAM).Power of anaerobic metabolism threshold (TAM, W; W/kg -1 of body mass, % form maximal oxygen consumption) is a characteristic of work, with which intensity of anaerobic energy supply reactions is insufficient for satisfying energy demand.As a result there happens active start of glycolytic processes, which are accompanied by lactate accumulation to more, than 4 mmole -1 .In sports practice TAM is used for dozing of loads.That is why in practice relation of current oxygen consumption to its maximal value is often used (%).Besides, it is known that workability at TAM level is one of leading criteria of ski-racers' special endurance assessment [3,7,9].
Model characteristics were worked out on the base of concept about significance of workability at TAM level for prediction of high sport results in kinds of sports, which require high endurance.As reference we determined values of functional indicators at TAM level, required for maintaining speed 6.2 m.p.sec.(22.3 km.p.h.) at distance 6 km.Such characteristics were obtained on the base of regression equations (see fig. 1).
We also determined model characteristics of functional potentials' realization in conditions, simulating passing competition distance (see fig. 2).
We worked out and experimentally tested method of application of experimental data, received in laboratory conditions (ski treadmill) for prediction of speed, energy consumption and economy of skiing in real conditions of ski trail.
For assessment of functional potentials indicators we studied regression dependences between characteristics of skiers' special workability, their functional potentials and specificities of ski trails relief.We found that sportsmen's special workability is determined by indicators of maximal aerobic and anaerobic efficiency, economic character of external breathing in conditions of intensive muscular functioning (R=0.71;р0.05).
The model, reflecting interconnection of functional fitness indicators and specificities of hills permitted to assess influence of hills steepness and speed of their climbing at distance as well as realization of sportsmen's organism's functional potentials.From many indicators of sports efficiency in ski racings and aerobic (anaerobic) energy supply contribution in work we chose the most significant: level of oxygen consumption, excess of carbon dioxide (ExCO2) and heart beats rate (HBR).
We determined special workability of skiers, connected with aerobic efficiency.It reached the highest values at low values of speed of hills climbing and slope angle.It reached the least value at the highest slope angle and the least speed of its climbing (see figs.3,4).
The presented characteristics permit to conclude that for achievement high result in ski racings it would be insufficient to realize only aerobic potentials of sportsmen's organism.To achieve this target it is necessary to realize anaerobic potentials.Due to anaerobic energy supply mechanisms skiers climb hills of different complexity, which are more than 50% of all trail.To prove elite skiers' special workability's interconnection with economizing of respiratory functional system's reaction in conditions of special loads we worked out the model of interconnection of slope angle, speed of hill climbing with ExcCO2 (excess of СО2 release).This model reflects anaerobic metabolism processes in organism (see fig. 5).With characteristic of sportsmen's functional maintenance on hills of different steepness and length ExcCO2 is an important indicator.This indicator is a result of metabolic acidosis (disorder of internal medium constancy at excessive acids' formation, when buffer reserves drop lower than norm).It reproduces rather exactly the changes of lactic acid and blood bi-carbonates content.It permitted to determine the sportsmen's optimal range of anaerobic lactate power realization.

Fig. 5. Model of ExcCO2 interconnection of ski-racers with hills' climbing speed and slope angle
Thus, we showed possibility of orientation with assessment of sportsman's organism's functional reserves on interconnection of several indicators.These indicators characterize organism's potentials.They permits to predict realization of skiers' special workability, assess effectiveness of their functional fitness some components.Comparison of individual data of single sportsman with model indicators permitted to determine correspondence of sportsmen's functional potentials to the pre-set level of fitness, depending on sportsman's specialization.

Discussion
Results of the researches proved confident interconnection of ski trails characteristics with level of sportsman's organism's functional potentials realization.The received data comply with the data of other authors [12, 13, 20, and 21] about need in determination of sportsmen's special workability optimal parameters.The conducted researches resulted in finding that work at competitions on rugged trails is of alternative character.The main source of energy supply of sportsman's workability is organism's aerobic potentials.Their level reaches 92-95% from maximal values.Alongside with it passing of different by length and time hills and descents causes unequal intensification of anaerobic metabolism.We found that during climbing hills significant role in energy supply of skiers' organism belongs to anaerobic sources.Their volume reaches 80% from maximal values.Thus, correlation of metabolic reactions conditions higher orientation of adaptation changes of main functional systems, which ensure sportsmen's special workability.Functional potentials of sportsmen with high level of aerobic and anaerobic reserves realization are close to proper values of functional fitness.
Analysis of advanced specialists' publications witnesses [11,14], that simulation of sportsmen's special fitness includes development of complex of the most important and ranked by significance level indicators -model characteristics.Such characteristics shall be received in the process of training by the beginning of competitions.Special attention is paid to simulation of sportsmen's functional potentials, required for hills climbing.This fact is a fundamental condition of skiers' special workability formation.
Analysis showed that one of the most problematic questions of increasing of sportsmen's functional potentials is development of respiratory function, compensating metabolic acidosis.Such approach is in agreement with the data of other authors [16, 18, and 19].In the base of this function's assessment is the change of lungs ventilation's reaction, which characterizes organism's ability to release excessive СО2.With it, among the found factors of aerobic power, the most significant are absolute and specific indicators of oxygen consumption (r=0.96;р0.05) and maximal level of work intensity (r=0.73;р0.05).Among the found factors of anaerobic power the highest specific weight belongs to total speed of CO2 formation and release (r=0.79;р0.05), respiratory coefficient (r=0.98;р0.05) and excess of formed CO2 (r=0.96;р0.05).It is a factor, which proves impossibility to achieve high efficiency in ski racings without noticeable realization of anaerobic potential in process of competition distance passing.
Materials of our researches to certain extent supplement theoretical principles, devoted to the problem of skiracers' functional fitness perfection at different segments of distance.For the first time we determined model characteristics of ski-racers' functional potentials at hills' climbing of different complexity, which can serve as the basis of assessment of sportsmen's special workability components at different segments of competition distance.

Conclusions
On the base of our researches we worked out model characteristics of most important parameters (functional and competition functioning) of elite sportsmen's fitness.Their application can facilitate maintenance of special workability at high level on all segments of competition distance.Especially it concerns the trails with hills of different steepness.
The found individual distinctions in special workability of ski racers permit to work out training programs with accent on "leading" indicators.Besides, they permit to build group and individual models of competition distances' passing, considering sportsmen's functional fitness.These results can be used for control over special fitness dynamic on stages of preparatory period and realization of individual approach to control over training process.

table 1 )
we offered mean values of functional indicators, required for maintaining speed 6.2 m.p.sec.(22.3 km.p.h.) at distance 6 km.

Table 1 .
Reference and mean-group values of respiratory and blood circulation functional indicators of sportsmen, -ski-racers