TY - JOUR AU - Bocharin, Ivan V. AU - Krokhin, Dmitry V. AU - Balina, Maria V. AU - Zarembovsky, Mikhail A. AU - Fedorova, Marina V. T1 - Differentiation of Adaptive Phenotypes of Students According to the Data of Heart Rate Variability in the Post-Exercise Period JO - Journal of Stress Physiology & Biochemistry Y1 - 2026/march VL - 22 IS - 1 SP - 48 EP - 54 UR - http://www.jspb.ru/issues/2026/N1/JSPB_2026_1_48-54.pdf KW - adaptive reserves KW - heart rate variability KW - physical activity KW - stress tests KW - students U1 - 1997-0838 N2 - 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. ER -