A time-motion analysis of turns performed by highly ranked Viennese waltz dancers

摘要

Twenty-four dance couples performing at the 2011 IDSF (International DanceSport Federation) International\udSlovenia Open were divided into two groups: the first twelve placed couples (top ranked) and the last twelve placed\udcouples (lower ranked). Video recordings were processed automatically using computer vision tracking algorithms\udunder operator supervision to calculate movement parameters. Time and speed of movement were analysed during\udsingle natural (right) and reverse (left) turns performed during the Viennese waltz. Both top and lower ranked dancers\udtended to perform similar proportionate frequencies of reverse (≈ 35%) and natural (≈ 65%) turns. Analysis of reverse\udturns showed that the top ranked dancers performed less turns on a curved trajectory (16%) than the lower ranked\uddancers (33%). The top ranked couples performed all turns at similar speeds (F = 1.31, df = 3, p = 0.27; mean = 2.09m/s)\udall of which were significantly quicker than the lower ranked couples (mean = 1.94m/s), the greatest differences found\udfor reverse turns (12.43% faster for curved trajectories, 8.42% for straight trajectories). This suggests that the ability to\udmaintain a high speed in the more difficult turns, particularly the reverse turns on a curved trajectory, results in the\udoverall dance appearing more fluent as the speed of movement does not fluctuate as much. This aspect of performance\udneeds to be improved by lower ranked dancers if they wish to improve rating of their performance. Future research\udshould determine which factors relate to the speed of turns.