Department of Internal Medicine;
Kuopio University Hospital and University of Eastern Finland;
Kuopio;
Finland;
Heart Center;
Kuopio University Hospital and University of Eastern Finland;
Kuopio;
Finland;
Center of Preventive and Sports Medicine;
Safarik University and Pasteur Hospital;
Kosice;
Slovakia;
Department of Clinical Physiology and Nuclear Medicine;
Kuopio University Hospital and University of Eastern Finland;
Kuopio;
Finland;
Heart Rate Variability; Heart Rate Turbulence; Cardiorespiratory Fitness; Vasoactive Peptides; Proinflammatory Cytokines;