| Summary: | The research study presents the results of the pedagogical experiment that lasted during 2017-2018 academic year. Altogether 101 girls aged 12-13 years who, for reasons of health, are classified as primary and preparatory medical groups, were involved in the research. The purpose of the research was to determine the appropriate standards of physical fitness of 12-13-year old girls, which provide a stable level of physical health. To achieve this goal, an integrated approach was used using the following research methods: analysis and synthesis of special research and methodological literature and documentary materials; anthropometric methods; determination of the level of physical health; pedagogical testing; physiological methods; methods of mathematical statistics. The article presents the results of correlation relationships of indicators of motor tests and physical health. On their basis, regression equations were estimated to determine the appropriate values of physical fitness of girls aged 12-13 years with an average and below the average level of physical health. Through the use of factor analysis, we identified five statistically independent factors: muscular strength, speed-strength, agility, endurance and speed. The total contribution of these factors to the generalized variance of the sample is 89.6 %. We selected the most informative motor tests: for assessing muscle strength - shoulder flexor dynamometry (r = 0.759 with p < .01), speed-strength qualities – standing long jump (r = 0.800 with p < .01) speed - the difference between the time of shuttle run 3 × 10 m and 30 m (r = 0.808 with p < .01); endurance - relative performance (PWC150) (r = 0.869 with p < .01) and speed - 5 seconds running in the place at the maximum pace (r = 0, 0.860 p < .01). The results have prognostic value for the development of methods of training with a rational correlation of physical activity of various directions for a given age group.
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