Differentiation of Adaptive Phenotypes of Students According to the Data of Heart Rate Variability in the Post-Exercise Period

The aim of the study is to differentiate students by the level of adaptive reserves of the body in the post-loading period using cluster analysis. Results: It was found that HRV parameters in the post-loading period reflect the heterogeneity of adaptive reactions. Cluster analysis allowed us to identify three groups of students: those with optimal, borderline, and stressed regulation. The first group is characterized by a balanced interaction of sympathetic and parasympathetic links, the second by a compensatory tension of regulatory mechanisms, and the third by a pronounced centralization of the heart rate and signs of functional maladaptation. Conclusion: Heart rate variability indicators are a highly informative marker of the body's adaptive reserves. The cluster analysis method provides a personalized assessment of students' condition and can be recommended for optimizing physical fitness and preventing maladaptation conditions.