Stroke Adjustment in the Regulation of Turning in Front Crawl Stroke
| Autor: | Wang, Ning, 王甯 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 In this research program tumble turn was examined as a complex system where the individual, the task, and the environmental constraints were continually interacting to shape the performance. This research provided an opportunity to investigate the adjustment and adaptations of movements in a sample of elite athletes. Thus, aims of this study were to examine the key characteristics and explore the influences of the stroke adjustment on the turning performance. Nine regional and nine club level French male swimmers participated in this study. Two experimental tasks were implemented. The first task was to examine the perceptual ability of estimating distance to the wall. The second task was to examine the differences of the regulation strategy while approaching the wall (turning movement) in the crawl stroke between two levels of swimmers at two efforts (70% and 90%) under the changes of the standard “T” line position (normal T line, T line repositioned backward 30cm, and 60cm). One underwater camera (50Hz) and a ground camera were used for data collection. The correlation between the estimation accuracy of the distance and the performance of the turn was examined, and the movement kinematics was analyzed using the 3-way MANOVA. The results showed that the velocity pattern from the two strokes before turn initiation was neither stable nor increasing but in a pattern of decelerating then accelerating. This particular velocity profile indicates a stroke adjustment strategy before turning. Furthermore, elite swimmers present a constant and earlier turning point behavior and have superior performance of movement represented by kinematic variables. Last, the velocity may be an important control parameter in tumble turn coordination. We suggest increasing the variability of speed in swimming program in order to improve the turning performances. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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