*National Centre for Sports Medicine, Warsaw, Poland;
†Department of Pediatrics with Medical Assessment Unit, Medical University of Warsaw, Warsaw, Poland;
‡Department of Applied and Clinical Physiology, University of Zielona Gora, Zielona Gora, Poland;
§Department of Applied Physiology, Mossakowski Medical Research Centre Polish Academy of Sciences, Warsaw, Poland;
¶Department of Psychology, SWPS University of Social Sciences and Humanities, Warsaw, Poland;
║Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, Warsaw, Poland; and
**Department of Social Medicine and Public Health, Medical University of Warsaw, Warsaw, Poland.
Corresponding Author: Ernest Kuchar, PhD, Department of Pediatrics with Medical Assessment Unit, Medical University of Warsaw, Zwirki i Wigury 63A, 02-091 Warsaw, Poland ([email protected]).
The study was financed with own funds of the National Centre for Sports Medicine and Polish Olympic Committee.
The authors report no conflicts of interest.