To investigate this, in 199 men (30–89 years) and 81 women (33–76 years), bending over, brake, propulsion, leg stiffness and hip flexion angles were assessed during a sprint stride using high-resolution video analyses. The aim of this study was to assess the influence of age, sex and sprinting kinematics on sprint performance. Nevertheless, for optimum results an angle of 90° is suggested.The sprint performance of master athletes decreases with age, but little is known about possible contributions of changes in sprint kinematics. The results thus obtained indicate that the Kinovea software is a valid and reliable tool that is able to measure accurately at distances up to 5 m from the object and at an angle range of 90°–45°. To evaluate Kinovea reliability and validity a multiple approach was applied involving the following analysis: -systematic error with a two-way ANOVA 2x4 -relative reliability with ICC and CV (95% confidence interval) -absolute reliability with Standard Error. For each export data item, 20 angles and 20 distance variables were calculated, with intra- and inter-observer reliability also analysed. Each frame was examined by three observers who each made two attempts. For this purpose, a figure with 29 points was designed (in AutoCAD) and 24 frames analysed. The main objective of this study was to determine the validity and reliability of the Kinovea software in obtaining angular and distance data at different perspectives of 90°, 75°, 60° and 45°. Although it has been validated as a tool with which to assess time-related variables, this is not yet the case regarding angular and distance variables. This low-cost technology has been used in sports sciences, as well as clinical field and research work. Kinovea © is a free 2D motion analysis software that enables the establishment of kinematics parameters. Clinical rehabilitation and sports performance analysis both require the objectification of movement.
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