The significance and applicability of current survival predictors (chronotropic index (CI) and exercise tolerance (ET)) have not been sufficiently studied in minimal cardiovascular risk groups and young people. Objective — to investigate changes in the predictors of survival in the young population. Subject and methods. A mixed healthy 68 young population aged 17—23 years was examined and divided into two groups differing in their motor history. Group 1 consisted of persons with high- level physical activity (athletes developing endurance (n=32)); Group 2 included those with low-level physical activity (young people who were not related to systematic physical activity (n=36). A maximum testing was conducted on a bicycle ergometer. CI, heart rate (HR), and mathematical model markers for cardiorhythmograms were analyzed; Spearman probe rates versus ET were investigated. Results. CI did not reach a survival rate of 85% in all studied groups and decreased in the series: S, 2, 1. With this CI, HR during exercise and recovery statistically significantly dominated in Group 2, and HR after exercise and dHR (the difference between HRpeak and HRrest) did in Group 1. Correlations of the measures indicate the features of CI formation at different level of physical working capacity. Conclusions. CI in the young population remains a survival predictor exclusively for individuals with low-level physical activity. For individuals with high-level activity, this criterion is a quantitative equivalent of physical health and can be used to analyze ET. At the same time, the severity of CI is inversely proportional to physical performance.