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Introduction: In recent years, the relationship between the systematic practice of physical exercise, cardiovascular dynamics and the functioning of the autonomic nervous system has been recognized. Objective: To determine the modifications that non-linear parameters undergo in the autonomic cardiovascular regulation of the heart rate variability with the systematic practice of physical exercise. Methods: A retrospective cohort analytical study was conducted from February 2016 to August 2018. Population and sample: 36 individuals (Group 1: 18 high- performance baseball athletes; Group 2: 18 medical students). The data were collected in the Biomedical Basic Sciences Laboratory at Medical school 1, University of Santiago de Cuba, through the 8-channel PowerLab polygraph, and stored using the Kubios Software version 3.0.4 Premium. Results: Statistically significant differences between means were found in heart rate values (p = 0.000); SD1 (p = 0.025); SD2/SD1 ratio (p = 0.007); sample entropy (p = 0.011); short-term fluctuations α 1 (p = 0.019); mean line length (p = 0.016); max line length (p = 0.001); recurrence rate (p = 0.034); determinism (p = 0.010) and Shannon entropy (p = 0.015). The parameters of SD1 (C = 0.906) and sample entropy (C = 0.712) were significantly associated with a heart rate ≤ 70 beats per minute. Conclusions: With the systematic practice of physical exercise, the non-linear parameters of the autonomic cardiovascular regulation of the heart rate variability undergoes modifications that respond to a better adaptability of the autonomic nervous system, and to a greater capacity to regulate cardiovascular function.

La COVID-19 ha desatado una emergencia internacional en Salud Pública al afectar millones de personas, provocar muertes, y causar una crisis humanitaria nunca antes vista. Esto ha saturado los sistemas de información en salud de los países afectados, donde resultan de utilidad las herramientas informáticas para el manejo de un gran número de casos, al menor costo económico posible. En este contexto resalta el paquete de programas epidemiológicos Epi InfoTM, que permite crear formularios electrónicos para la recolección de datos. La presente investigación tiene como objetivo describir las ventajas y facilidades de implementar Epi InfoTM para los casos de COVID-19. Con módulos para analizar la información mediante cálculos y representaciones de medidas epidemiológicas, además de crear mapas de casos sospechosos o confirmados, Epi InfoTM cuenta también con complementos para dispositivos móviles y la web; todos con experiencias probadas en situaciones de epidemias como la del Ébola, VIH y el MERS. Por lo que Epi InfoTM es una aplicación robusta y libre de costo muy útil para su implementación en los sistemas de información en salud para el manejo adecuado de casos de COVID-19. Palabras clave: COVID-19; sistemas de información en salud; sistemas de información geográfica; epidemias. ABSTRACT COVID-19 has unleashed an international Public Health emergency by affecting millions of people, causing deaths, and a humanitarian crisis never seen before. This has saturated the health information systems of the affected countries, where computer tools are useful for managing a large number of cases, at the lowest possible economic cost. In this context, the Epi InfoTM package of epidemiological programs which allows creating electronic forms for data collections, stands out in addition with modules to analyze the information through calculations and representations of epidemiological measures. It also allows creating maps of suspected or confirmed cases and has applications for mobile devices and web; all with proven experiences in epidemic situations such as Ebola, HIV, and the previous outbreaks of Coronavirus. Therefore, Epi InfoTM is a robust and free of cost application, very useful for its implementation in health information systems for the adequate management of COVID-19 cases. Keywords: COVID-19; health information systems; geographic information systems; epidemics.