Key result
Increased physical workload at the competition stage significantly decreased early ventricular repolarization duration and increased negative extremum amplitude compared to the preparatory stage.
Why the study?
Does the stage of the annual training cycle and associated physical workload intensity alter ventricular repolarization in highly qualified cross-country skiers?
Observational
Does the stage of the annual training cycle and associated physical workload intensity alter ventricular repolarization in highly qualified cross-country skiers?
Intense physical workloads during the competition stage in cross-country skiers lead to significant changes in ventricular repolarization, highlighting sports-specific morphofunctional cardiac adaptations.
The study of the heart electrical activity of cross-country skiers with a high sports qualification has been carried out at different stages of the annual training cycle. It has been found that the morphofunctional cardiac reconstructions associated with an increase in the intensity of physical workloads from the preparatory cycle to the competition stage lead to a change in the repolarization of the ventricles: the early repolarization duration of the ventricles (the Tpeak-TendII interval) was significantly decreased during the recovery from submaximal exercise on ECGII; the negative extremum amplitude of the cardio electric field on the body surface of athletes increases significantly with an insignificant increase in the amplitude of the T wave on the ECGII. The individual cardioelectrotopographic analysis of the cardio electric field on the body surface of the examined athletes during the period of ventricular repolarization showed a change in the amplitude–time dynamics of the extrema at the competition stage in comparison with the preparatory stage.
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Пантелеева et al. (2018) conducted an observational in Healthy athletes (cross-country skiers). Increased physical workload intensity (competition stage) vs. Preparatory stage was evaluated on Ventricular repolarization parameters (Tpeak-TendII interval and cardio electric field amplitude). Increased physical workload at the competition stage significantly decreased early ventricular repolarization duration and increased negative extremum amplitude compared to the preparatory stage.
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