Kleymenova M.D., Vitko S.U., Zvyagintsev P.N., Shсherbina A.F., Ivanov V.A. Optimization of operational control in physical education using digital technologies based on heart rate indicators. TPPC [Internet]. 2025 Aug. 22 [cited 2025 Dec. 5];(6):40-2. Available from: http://tpfk.ru/index.php/TPPC/article/view/1382