Assessment of public health of production workers according to HRV Anastasia Bashkireva, Tatiana Bashkireva, Alexander Severin, Sergey Chibisov, Natalia Fateeva and Evgeniya Severina E3S Web Conf., 217 (2020) 08004 Published online: 14 December 2020 DOI: 10.1051/e3sconf/202021708004