TY JOUR TI Electromyography as an instrumental diagnostic method in functional testing of stabilizer muscles of the cervical spine in children with Down syndrome KW Down syndrome KW adaptive physical education KW adaptive swimming KW cervical spine instability KW electromyography KW bioelectrical activity JO Scientific notes of P. F. Lesgaft University AU Bezryadnov, E.A. AU Eydel'man, L.N. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft