Vovkanych, Lyubomyr, Yuriy Boretsky, Viktor Sokolovsky, Dzvenyslava Berhtraum, and Stanislav Kras. “Validation of the Software-Hardware Complex ‘Rytm’ for Measurement of the RR Intervals and Heart Rate Variability Analysis During Exercise and Recovery Period”. Physical Education Theory and Methodology 21, no. 1 (March 25, 2021): 61–68. Accessed July 14, 2026. https://tmfv.com.ua/journal/article/view/1461.