@article{Panoutsakopoulos_Theodorou_Kotzamanidou_Skordilis_Kollias_2013, title={Biomechanical analysis of the final strides of the approach and the take-off by visually impaired class F12 and F13 long jumpers}, volume={8}, url={https://www.jhse.ua.es/article/view/2013-v8-n3-proc-biomechanical-analysis-of-the-final-strides-of-t}, DOI={10.4100/jhse.2013.8.Proc3.13}, abstractNote={<p><span>Despite of the level of visual aquity, European Records in long jumping are greater in class F12 (visual acuity 2/60) than class F13 (visual acuity 6/60) both in males and females. The aim of the present study was to compare the biomechanical parameters of the final strides of the approach and the take-off in class F12 and F13 long jumpers. 19 class F12 (males: 13, females: 6) and 12 class F13 (males: 4, females: 8) long jumpers participating in the 2009 International Blind Sports Association European Championships were recorded using a stationary digital video camera (sampling frequency: 300 fps). Key biomechanical parameters were extracted with a typical 2D-DLT kinematical analysis. Differences between groups were investigated using Independent samples t-test. Results indicated that the official distance was 6.07 m ± 0.55 and 5.52 m ± 0.91 for F12 and F13 respectively (p<.05). Significant differences were also observed concerning the vertical take-off velocity (F12: 2.8 m/sec, F13: 2.4 m/sec), the support leg’s knee flexion (F12: 18.2 deg, F13: 25.2 deg) and the knee joint flexion velocity (F12: 7.4 rad/sec, F13: 10.2 rad/sec) at the take-off board and the knee maximum flexion angle at the last stride (F12: 116.8 deg, F13: 125.4 deg). In conclusion, F12 performed better than F13 because of the more advantageus utilization of the factors defining the vertical component in the long- jump take-off. Additionally, the different last stride maximum knee flexion angle might imply differences concerning the mechanics of the placement of the take-off leg. It is possible that factors such as the size and surface properties of the 1.22 m x 1.00 m chalked take-off area used in F12 competition may contribute to the differences observed in the study. </span></p>}, number={3proc}, journal={Journal of Human Sport and Exercise}, author={Panoutsakopoulos, Vassilios and Theodorou, Apostolos and Kotzamanidou, Mariana and Skordilis, Emmanouil and Kollias, Iraklis}, year={2013}, month={Dec.}, pages={S671-S680} }