1. Meerson, F.Z. and Pshennikova, M.G., Adaptatsiya k stressovym situatsiyam i fizicheskim nagruzkam (Adaptation to Stress and to Physical Loads), Moscow: Meditsina, 1988.
2. Tarasova, O.S., Borovik, A.S., Kuznetsov, S.Yu., et al., The pattern of changes in physiological parameters in the course of changes in physical exercise intensity, Hum. Physiol., 2013, vol. 39, no. 2, p. 171.
3. Lelyavina, T.A., Sitnikova, M.Yu., Berezina, A.V., et al., New approaches to the allocation of stages (phases) of continuously increasing physical activity by the example of cardiorespiratory test, Serdtse: Zh. Prakt. Vrachei, 2012, no. 3, p. 146.
4. Makarov, L.M., Balykova, L.A., Gorbunova, I.A., et al., Changes of QT interval during graded exercise test in healthy 11–15 years old adolescents, Kardiologiya, 2012, vol. 52, no. 9, p. 15.
5. Saltykova, M.M., Mechanisms of QRS voltage changes on ECG of healthy subjects during the exercise test, Hum. Physiol., 2015, vol. 41, no. 1, p. 62.