The Influence of Anthropometric Characteristics on Kinematic Parameters of Children's Sprinter's Running.

Children's sprinters running differs from the adults' one primarily in their motoric abilities, anthropometric characteristics, physiological and biochemical characteristics, as well as psychological and sociological characteristics. This research's aim was to examine the influence of anthropometric characteristics on kinematic parameters of children's sprinter's running. The sample of variables consisted of variables which determine anthropometric characteristics (14 anthropometric characteristics) and of 5 kinematic parameters'variables of sprinter's running. Kinematic parameters of sprinter's running in the phase of maximal speed have been collected by applying the Optojump technology (Microgate, Italy) and the sprinter's running times were measured every 5 meters on a 50 m lap. The results obtained from the multiple regression analysis between the group of anthropometric characteristics and the 50 m running results indicate that the percentage of fatty tissue is a statistically significant variable with boys, while the same variable with girls is near the limit of statistical significance. In the factor structure of anthropometric characteristics two factors have been set apart with boys and three with girls. The first factor set apart with both boys and girls is the factor of body voluminosity, the second factor with boys is the factor of longitudinal dimensionality, while with girls it is the factor of fatty tissue quantity. The factor of longitudinal dimensionality is the third girls' factor. For most variables a negative correlation has been determined with a higher percentage of fat or a higher quantity of subcutaneous fatty tissue with both boys and girls. Boys having a lower quantity of subcutaneous fatty tissue achieve better results in 50 m running, they have a shorter duration of contact with the pad, a longer duration of the flight phase and a longer step length when compared to boys with a higher quantity of subcutaneous fatty tissue. Boys with a bigger body muscular mass achieve a shorter duration of the contact, a longer duration of the flight and a longer step length. Girls who have a lower quantity of subcutaneous fatty tissue achieve a better 50 m running time, have a shorter duration of contact with the pad and a longer step length. It has been established that taller boys have a longer step length, and longer feet significantly influence the longer duration of contact with the pad and the lowering of the step frequency.