Key result
Higher natural light linked to activated frontal and occipital energy metabolism and temporal exhaustion in Arctic residents.
Why the study?
The physiological mechanisms of human acclimatization to extreme Arctic climatic conditions and seasonal light cycles affecting cerebral metabolism and autonomic nervous system activity require investigation.
How do seasonal fluctuations in natural light affect cerebral metabolism in Arctic region residents with different autonomic tones?
Observational (n=49)
How do seasonal fluctuations in natural light affect cerebral metabolism in Arctic region residents with different autonomic tones?
Seasonal increases in natural light activate cerebral energy metabolism in Arctic residents, with adaptation processes being more stressful in individuals with sympathetic autonomic predominance.
Seasonal light exposure was associated with regional cerebral metabolic shifts in Arctic residents; hypothesis-generating for autonomic tone effects on adaptation.
Background — The study of physiological mechanisms of human acclimatization to extreme climatic conditions is an urgent task in current socioeconomic conditions of the Arctic region development. Natural cycles of seasonal adaptation based on light stimulus cause functional restructuring of the cerebral cortex and subcortical activity centers and change the activity of the autonomic nervous system. Objective — The article aims at determining the characteristics of brain energy metabolism in Arctic region residents with different autonomic tones during different seasons. Material and Methods — The first stage of our study was conducted using the computer appliance VNS-Spectrum (Neurosoft LLC, Russia) and resulted in setting up two groups: with predominance of the parasympathetic autonomic nervous system (26 subjects) and with prevailing sympathetic autonomic nervous system (23 individuals). At the second stage, the study of the seasonal dynamics in cerebral energy processes took place (in October, December, March, and June) by means of using the five-channel diagnostic complex Neuro-KM for topographic mapping of brain electrical activity via direct current potential levels (DCPL). Results — Our results did not exhibit statistically significant gender-related differences, hence they permitted to form a single group. The results were compared with the software reference values for the norm. Conclusion — Enlarged levels of natural light prompt the activation of energy metabolism in frontal and occipital lobes of the Arctic residents’ cortex, accompanied by forming an exhaustion area in the temporal lobes. In the group of sympathotonic individuals, we revealed somewhat tense adaptation processes. Adaptation process of brain energy supply in vagotonic individuals occur less stressfully during the annual cycle.
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Грибанов et al. (2021) conducted an observational in Healthy individuals with different autonomic tones (n=49). Seasonal fluctuations in natural light vs. Different seasons (fall, winter, spring, summer) was evaluated on Cerebral energy metabolism (direct current potential levels). Enlarged levels of natural light prompted the activation of energy metabolism in the frontal and occipital lobes of Arctic residents, accompanied by an exhaustion area in the temporal lobes.
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