MoVEMEnt cooRdinAtion: pEculiARitiES oF StREnGth EFFoRt ASSESSMEnt in GiRlS AGEd 11-13

The purpose of the study is to determine the peculiarities of strength effort assessment in girls aged 11-13. materials and methods. The study participants were girls aged 11 (n=25), 12 (n=27), 13 (n=18). The children and their parents were fully informed about all the features of the study and agreed to participate in the experiment. The paper used methods of scientific literature analysis, testing, methods of mathematical statistics. To determine the peculiarities of strength effort assessment, the study used a t-test for paired observations and a t-test for independent samples. results. The girls aged 11-13 demonstrate the best assessment of effort reproduction at 2/3 of maximum strength. There is no statistically significant age-related dynamics in strength effort assessment in girls aged 11-13. The correlation between the effort reproductions at 1/3, 1/2 and 2/3 of maximum strength is not statistically significant. Conclusions. In the process of physical education of girls aged 11–13, special attention should be paid to the development of motor control ability as the component of coordination training of schoolchildren.

The research findings obtained by Lopatiev, Ivashchenko, Khudolii, Pjanylo, Chernenko and Yermakova (2017), Ivashchenko, Khudolii, Iermakov and Prykhodko (2018) reveal the multifactorial structure of motor abilities development in schoolchildren. In the structure of movement coordination, motor control ability plays a key role (Ilin, 2003;Khudolii & Ivashchenko, 2014;Ivashchenko, 2016). Muscular strength is the basis for demonstrating schoolchildren's motor abilities, and the ability to assess muscular effort is key to evaluating the spatial and temporal characteristics of movement (Serhiienko, Chekmarova & Khadzhynov, 2012;Ivashchenko, 2016). Farfel (2011) paid particular attention to the peculiarities of evaluating the spatial, temporal and strength characteristics of movement.
The analysis of scientific literature suggests the need for further research on the peculiarities of strength effort assessment.
The purpose of the study is to determine the peculiarities of strength effort assessment in girls aged 11-13.

Materials and methods
Study participants. The study participants were girls aged 11 (n=25), 12 (n=27), 13 (n=18). The children and their parents were fully informed about all the features of the study and agreed to participate in the experiment.
Study organization. The paper used methods of scientific literature analysis, testing, methods of mathematical statistics.
Testing procedure. Strength effort assessment. Equipment: dynamometer, calculator. Testing: the right hand maximum strength was measured for each participant. After that, they were asked to perform the following effort that equals to: 1/3 of maximum strength; 1/2 of maximum strength; 2/3 of maximum strength.
The result in kg was recorded in the protocol. The error of the produced effort was calculated in percentage. To determine the maximum effort, the testees made two attempts. The best result was recorded. The dosed effort was performed once.
Statistical analysis. To determine the peculiarities of strength effort assessment, the study used a t-test for paired observations and a t-test for independent samples. Table 1 shows the results of the analysis of age-related dynamics of strength effort assessment in the girls aged 11-13. There is no statistically significant dynamics in strength effort assessment in the girls aged 11-13.

Results
Tables 2-4 show the results of the comparison of error when assessing different efforts. The girls aged 11 demonstrate the best assessment of effort at 2/3 of maximum strength. The worst one -the effort at 1/3 of maximum strength (p=0.001). There is a statistically significant correlation between the assessments of efforts at 1/3 and 2/3 of maximum strength (p=0.035).
The girls aged 12 demonstrate the best assessment of effort at 2/3 of maximum strength, the worst onethe effort at 1/3 of maximum strength (p=0.001). There is no statistically significant correlation between the assessments of different efforts (p>0.05).
The girls aged 13 demonstrate the best assessment of effort at 2/3 of maximum strength, the worst onethe effort at 1/3 of maximum strength (p=0.001). There is no statistically significant correlation between the assessments of different efforts (p>0.05).

discussion
The study assumed that schoolchildren had peculiarities in assessing efforts at 1/3, 1/2 and 2/3 of maximum strength. The study has found that there are no age-related changes in muscular effort assessment in the girls aged 11-13. This indicates that this age period is not sensitive to the development of the ability to assess strength effort. These results supplement the data of Balsevich (2000), Ilin (2003), Liakh (2000) on the sensitive periods of movement coordination development in children and adolescents, and the data of Nosko (2002), Nosko and Arkhypov (2014), Khudolii and Ivashchenko (2014) on motor function development in children and adolescents.
The girls aged 11-13 demonstrate the best assessment of effort at 2/3 of maximum strength. These results confirm the data obtained by Ivashchenko (2016), Liakh (2000 showing that children and adolescents best assess efforts at 2/3 of maximum strength. These findings confirm the conclusion made by Farfel (2011) that the errors in the assessment of different modalities in motor control do not correlate with one another and require a special training for ages 11-13. The importance and practical significance of the results of research on kinesthetic sensitivity are highlighted in the papers by Li, Su, Fu and Pickett (2015), Brink andJacobs (2011), Morash, Pensky, Alfaro, andMcKerracher (2012).
conclusions Girls aged 11-13 demonstrate the best assessment of effort at 2/3 of maximum strength. There is no statistically significant age-related dynamics in strength effort assessment in girls aged 11-13.
In the process of physical education of girls aged 11-13, special attention should be paid to the development of motor control ability, the correlation between the effort reproductions at 1/3, 1/2 and 2/3 of maximum strength is not statistically significant.