TY JOUR TI Features of the Application of Instrumental Methods for Lumbosacral Muscle Groups Functional State Assessing KW JO Bulletin of Rehabilitation Medicine AU Borodulina, I.. AU Mukhina, A.. AU Chesnikova, E.. PY 2021 IS 20 PB Federal State Budgetary Institution «National Medical Research Center of Rehabilitation and Balneology» of Ministry of Healthcare of Russian Federation