Abstract
The paper examines the annual profile of fluctuating microalternations of some ECG parameters in healthy students who live in northern conditions and have different chronotypes. The main method of the research was the dispersion mapping that helped assess the energy and metabolic processes in myocardium. Among male and female students, 14,3% had the morning chronotype, 50,7% had the arrhythmic chronotype, and 35% had the evening chronotype. Previously published research results showed a similar distribution of chronotypes among the population of the north: individuals with the arrhythmic chronotype dominate in the sample, the evening chronotype is the second most common, and the morning chronotype can be found in a smaller number of people. The seasonal dynamics of dispersion mapping indicators in students was analyzed. The analyses revealed an increase in the values of the Myocardium Index in students of all chronotypes in spring, with no significant deviations to be noted. The maximum values of the Heart Rate and Rhythm indicators in the annual dynamics in all students were noted in spring, and the minimum values, in summer, with significant deviations observed. The Rhythm integral indicator pointed to the signs of tension of adaptation mechanisms in the subjects with the evening chronotype in spring. Increased ECG microalterations (Myocardium, Heart Rate, Rhythm) in male and female students in spring may indicate the influence of climatic conditions that put a greater stress on the cardiovascular system in the transitional seasons. It is manifested by a change in the electrophysiological properties of the myocardium. In the subjects with the evening chronotype, the circadian rhythms of the circulatory system were more sensitive to the hypocomfortable conditions of the north.
Highlights
In biorhythmology, researchers pay significant attention the rhythm of cardiac activity
According to the obtained survey data, 14,3% of students had the morning chronotype, 50,7% had the arrhythmic chronotype, and 35% of the surveyed men and women had in the evening chronotype
The Myocardium index in most of the subjects was within the standard range, with the exception of the subjects with the evening chronotype in spring in whom the myocardial microalternation index (MMI) exceeded the upper limit of the physiological norm
Summary
Researchers pay significant attention the rhythm of cardiac activity. The circulatory system is especially sensitive to the influence of the external environment. It enters upon the adaptation reactions rather early and can be considered as an indicator of the adaptive reactions of the whole organism. The seasonal functional activity of the cardiovascular system parameters is considered as an indicator of health status, while rhythm disturbance is as an indicator of pre-pathological conditions and dysfunctions. The seasonal changes in the indicators of electrocardiogram (ECG) dispersion mapping should be studied because it expands the understanding of the role of biological rhythms in ensuring adaptation and homeostasis processes. It is quite relevant to use of the chronobiological approach to identify premorbid conditions preceding the clinical manifestation of dysfunctions
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