Evaluation of preconditions for sport performance is the basic premise of successful training process. One of the possibilities is the evaluation on the basis of muscle biopsy that is measuring morphological structure of decisive muscle groups. However, using invasive methods for these purposes is very limited today. It is possible to gain information about speed power and endurance abilities out of evaluation of changes in movement speed in relation to undertaken distance. Indicator of these preconditions is regression - changes in speed in relation to changing distance. At white-water canoeists the inclination of this regression in real conditions (coefficient a at linear regression - speed = a . log (distance in m) + b) enables difference in preconditions for speed and endurance load. Longitudinal changes of both coefficients (a and b) reflect changes in individual training level and reflect qualitative and quantitative content of training load. These changes were evaluated at the group of 3 male kayakers and 4 female kayakers of elite performance during the training year. Found changes in the inclination of the above stated relations (values of coefficients a) reflect qualitative changes in the undertaken training load, mainly then rate of speed and speed-power load. To sum up, we can state that through the dependence of movement speed on the undertaken distance we can evaluate fitness preconditions of white-water canoeists in real conditions.
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