Longer-legged sprinters will accomplish the same running speed with a greater thigh angle at contralateral foot strike, greater knee flexion range, and smaller maximal leg backward swing velocity during the support phase. Based on the results, at a given leg length, faster maximal speed sprinting will be accompanied with greater thigh angle at the contralateral foot strike, greater maximal leg backward swing velocity during the swing phase, and smaller knee extension range during the support phase. For support leg kinematics, a significant regression model was obtained to predict knee flexion and extension angular displacements, maximal knee extension velocity, maximal leg backward swing angular velocity, and the other 13 kinematic variables (adjusted R 2 = 0.134–0.757, medium to large effect). For swing leg kinematics, a significant regression model was obtained to predict thigh angle at the contralateral foot strike, maximal knee flexion and thigh lift angular velocities, and maximal leg backward swing velocity (adjusted R 2 = 0.194–0.378, medium to large effect). Multiple regression equations to predict leg kinematics of maximal speed sprinting were successfully obtained. From the video images, leg kinematic variables were obtained and used as dependent variables for multiple linear regression equation with predictors of running speed, leg length, step frequency, and swing/support ratio. Seventy-nine male sprinters performed a maximal effort 60-m sprint, during which they were videoed through the section from the 40- to 50-m mark. This study aimed to provide multiple regression equations taking into account differences in running speed, leg length, and step characteristics to predict kinematics of maximal speed sprinting. 4Department of Sports and Health Sciences, Fukui University of Technology, Fukui, Japan.3Faculty of Health and Sports Sciences, University of Tsukuba, Ibaraki, Japan.2National Institute of Fitness and Sports in Kanoya, Kanoya, Japan.1Law Course, Department of Law, Nihon Bunka University, Tokyo, Japan.Kenji Miyashiro 1, Ryu Nagahara 2 *, Kohei Yamamoto 3,4 and Takahiko Nishijima 3
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