Panina L, Petryshyn Y, Kovalchuk S, Mysakovets O. Heart rate variability under interval hypoxic trainingand hemic hypoxia. Curr. Issues Pharm. Med. Sci. 2009;22(3):17-21. Accessed June 7, 2025. https://czasopisma.umlub.pl/curipms/article/view/2792