Pengaruh Panjang Tulang Tibia dan Berat Badan terhadap Kecepatan Berlari

Background: Early age developing treatment is one way to improve Indonesian Human Resources in sport. The talent identification process is done to determine the children’s sport potential. Running is one of the most important subdivisions in athletics that got to be developing at the early age. One of the important factors that affect 100 meters maximum running speed is the body structure. The longer the legs, the higher the speeds result. Besides, an overweight person tends to have a slow motion. This research has purpose to determine the effect of tibial length and body weight on running speed. Methods: The research was conducted by using observational analytic with cross-sectional approach. The research subjects were students of 5th grade at 15th Mangkubumen Lor Surakarta Elementary School. Samples were taken from 33 students by using proportional random sampling technique. The independent variables were the length of tibia bone and body weight, while the dependent variables were the running speed. Multiple linear regression was used as the research analysis technique. Result: Calculations show the multiple linear regression equation as follow: Y = 3,147 + 0,084 X1 – 0,027 X2. This model is avowed that got accurate predictive ability with (R2 = 0,264; p = 0,010). Regression coefficient statistical test show that tibial length (β = 0,424; p = 0,018) and body weight (β = -0,488; p = 0,007) take part to affect the running speed. Conclusion: Tibial length got a positive affect on running speed otherwise body weight got a negative affect on running speed. Keywords: Tibial length, Body weight, Running Spee