The aim of the study was to identify the characteristics of statistical stability in samples of tremorograms in two states (relaxation and cooling). Methods: the technique of numerous repetitions of tremor registration was applied; matrices of paired comparisons of tremorograms were calculated. Results. Numerous repetitions of tremorograms registration suggest that the degree of chaos in the work of the human neuromuscular system can only be determined through numerous repetitions as suggested by N. A. Bernstein which is in line with earlier proposed Eskov - Zinchenko effect. In the framework of this effect, statistical instability characterizes successively obtained samples of parameters xf of any movements. Conclusions. The statistical instability of tremorogram samples in unchanged homeostasis was found, and when a person's homeostasis changes under conditions of local cooling, a change in k number of pairs of tremorogram samples that statistically coincide is shown. The low-temperature effect acts as an environmental factor affecting the labor productivity of residents of the North of the Russian Federation, since cooling leads to a decrease in the accuracy of movements and a change in the spectrum of tremorograms, which manifests itself in the form of a change in k number during cold exposure.

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