Informative value of cardiohemodynamics and heart rate variability indices observed in young males with different levels of hypoxia-hypercapnia resistance

Male residents of Magadan region (n=96) were examined at enclosure breathing (reresperation) to study the body resistance to hypoxia-hypercapnia air mixture based on the ventilation indices. The examinees were divided into two groups of high- or low resistant ones. Statistic analysis of hemodynamics and heart rate variability was performed separately on each group before (baseline) and during the rerespiration test. Found that, heart rate variability indices registered during the test can be used to assess the body resistance to breathing hypoxia-hypercapnia air mixture instead of oxygen and carbon dioxide rates or oxihemogram to be used for this purpose. The findings testify to a rather high informative level of the studied heart rate variability characteristics.