Regression of Sports Vagotonia

Registration of Heart Rate Variability (HRV) in clinostasis conditions revealed that after 7 months from the moment of the forced complete cessation of all training loads, the median of 10 indicators (out of 15)-clino-HRV (TP, APHF, HF%, APVLF, APLF, RRNN, pNN50%, RMSSD, SDNN, and MxDMn) statistically significantly decrease to the level typical for non-athletes, while the medians of 3 indicators (VLF%, HR, SI) increase and only the medians of 2 indicators (LF%, AMLF/AMHF) do not change.During the same period, 11 indicators of ortho-HRV decreased to the level typical for non-athletes (TP, APHF, HF%, APVLF, VLF%, APLF, RRNN, pNN50%, RMSSD, SDNN and MxDMn) and the medians of 4 indicators (LF%, APLF/ APHF, HR and SI) increased.Heterochrony is characteristic of changes in the indicators of clino-and ortho-HRV.The first statistically significant changes in the median of HRV-indicators are observed a month after the cessation of training loads and they increase gradually, reaching a plateau after 2-5 months.The cessation of training loads was accompanied by a decrease in the activity of the Sympathetic Division (SD) of the Autonomic Nervous System (ANS) and especially, a decrease in the activity of the Parasympathetic Division (PD) of the ANS, including, probably, a decrease in the synthesis of non-neuronal acetylcholine (NN-ACh), the presence of which, however, even after 7 months of cessation of training is still present in K.D., although its level is significantly reduced.So, if, as is well known, long-term aerobic training loads are required for the formation of sports vagotonia, then a relatively short period of time is sufficient for its regression, judging by the data of the elite skier K.D.-no more than 7 months in the complete absence of endurance training.