TY JOUR TI Normalization of physical loads in training with somatically weakened children of 11-13 years, exercising in sports and health-improving groups of martial arts KW physical load; sports and health-improving groups; somatically weakened children; martial arts; annual cycle; heart rate JO Journal of Pedagogical Studies AU Nikitushkin, V.G. AU Min'kov, P.E. PY 2019 IS 4 PB INFRA-M Academic Publishing LLC.