Key result
A 50 km winter marathon slightly increased the proportion of stochasticity in the sympathetic nervous system from 11 to 13 coinciding pairs, demonstrating overall statistical instability of the samples.
Why the study?
Long-duration physical activity in winter imposes significant demands on the neurovegetative system, but changes in sympathetic and parasympathetic parameters during a winter marathon required exploration.
Does a winter marathon alter the parameters of sympathetic and parasympathetic neurovegetative systems in men?
Observational (n=15)
Does a winter marathon alter the parameters of sympathetic and parasympathetic neurovegetative systems in men?
A 50 km winter marathon in older men leads to an increase in the stochasticity of sympathetic and parasympathetic nervous system parameters, demonstrating the statistical instability of biological samples (Eskov-Zinchenko effect).
Answers are grounded in this paper and cite their sources.
May signal transient autonomic instability after winter marathon in older men; leaves open whether Eskov-Zinchenko effect warrants monitoring or further study.
Introduction: Long-duration physical activity in winter is associated with significant demands for neurovegetative system. Aim: To explore the changes in the parameters of sympathetic and parasympathetic neurovegetative systems in men during a winter marathon. Methods: Parameters of the sympathetic and parasympathetic nervous systems of the group were estimated in 15 men after the winter marathon (50 km) using an automated computer-based system. Pairwise comparisons matrices of the parameter of the sympathetic and parasympathetic systems before and after the marathon were performed. There were found the k numbers of pair samples that had a common general population. Results: Four matrices of pairwise comparisons were constructed and shown the increasing of the proportion of stochastic from k1 = 11 to k2= 13 for the sympathetic autonomic nervous system. Conclusions: An equidirectional dynamic of stochastic's proportion changes before and after the marathon is observed. For the sympathetic and parasympathetic systems, the drop of chaos is observed, but we still can make a conclusion on the statistical instability of the samples.
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Еськов et al. (2021) conducted an observational in Healthy men (marathon runners) (n=15). Winter marathon (50 km) vs. Before the marathon was evaluated on Number of statistically coinciding pairs (k) for the sympathetic autonomic nervous system. A 50 km winter marathon slightly increased the proportion of stochasticity in the sympathetic nervous system from 11 to 13 coinciding pairs, demonstrating overall statistical instability of the samples.
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