The results of this study indicate that at the end of a complete 200 m run, lane 6-runners have a mean advantage of 0.23 s and 0.10 s compared to lane 2 and lane 4 respectively. EMG-recordings were used to determine the duration of each stride.Ī mean 200 m-time was reconstructed by combining the interval times of both groups of subjects. Infrared sensors and an electronic timing system of Intersoft Electronics enabled the recording of the mean running speed in 15 different intervals. The order of running the different lanes was randomised. A comparable group of six sprinters performed a 120 m sprint, running full speed through the second curve of the 200 m track in the same lanes. Five national level male sprinters performed a 120 m all-out sprint from starting blocks in lanes 2, 4 and 6. The runner in lane 2 has to run a flat course over the total distance. When leaving the curve it is just the other way round. This implies uphill running in lane 3 to 6 when entering the curve and downhill running in lane 1. This track consists of a unique construction as the inclination axis of the lateral slope is situated in the middle of lane 2. Therefore it was the purpose of this study to analyze the time differences among 200 m sprint performances in lane 2, lane 4 and lane 6 on the Flanders Expo track, that will host the European Indoor Championships in the year 2000. It is clear that runners in the inner lanes have to work harder than those running in the outer lanes. The inhanging body position of the athlete reduces partly these centripetal forces. The centripetal force (Fc) is determined by the body mass (m) and the squared running velocity (v) of the athlete, as well as by the radius (R) of the curve: Fc= (m * v²)/R. The curves of these indoor tracks are normally constructed by means of lateral slopes to reduce the centripetal forces acting on the contact foot of the sprinter. In contrast with the standard 400 m outdoor track, indoor sprinting is performed on the more compact 200 m track. Athletics, sprint, indoor track, emg-recording, velocity Abstract
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