Shlyk, N. . (2022). STANDRDS FOR VARIATION RANGE OF RR-INTERVALS AT REST AND IN ORTHOSTASIS IN TRAINING OF RACING SKIERS WITH DIFFERENT TYPES OF REGULATION. Theory and Practice of Physical Culture, (12), 27–29. Retrieved from http://tpfk.ru/index.php/TPPC/article/view/76 (Original work published December 1, 2021)