TY JOUR TI Methods for functional pedagogical testing of stabilizer muscles in the cervical spine in children with Down syndrome KW children with Down syndrome KW cervical spine instability KW atlantoaxial instability KW adaptive swimming KW pedagogical testing KW functional testing KW LIN sports KW Special Olympics 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