Effect of Cold on Involuntary Movements in Men With Different Levels of Physical Fitness in the Russian North

Abstract

Cold is a common environmental factor for the population of the Russian North. The aim of the study was to assess the effect of cold stress on involuntary movements (tremor) in men with different levels of physical fitness. The paper presents a new method for calculation of quasiattractor parameters for estimation of biomechanical homeostasis in two dimensions. Biomechanical analysis according to quasiattractors parameters was realized as a numerical measure of neuro-muscular functional system parameters under the stress-perturbation. We calculate the quasiattractor's squares for men with different levels of physical fitness. We obtained the following results: calculation of quasiattractors square demonstrates the difference of homeostasis between before and after local exposure to cold. After the exposure we registered a 2.7 times- and 1.8 times increase of quasiattractors square among sportsmen and sportsmen, respectively. There were also differences between the distribution of quasiattractors across levels of physical training: for sportsmen we observed a normal distribution while and for non-sportsmen the distribution was not normal. The matrix of pairwise comparison of samples demonstrate the probability p < 0,01 for two identical samples of tremorograms. Conclusions. A local cold exposure results in a nearly 3-fold increase in the number of pairs of k coincidences of the tremorogram samples for men. We also found the dynamics of increasing areas of quasi-attractors after a local cold impact, which depends on the physical training of the subject.

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