University of Ljubljana, Faculty of Sport, Slovenia.
J Hum Kinet. 2013 Jul 5;37:55-62. doi: 10.2478/hukin-2013-0025. eCollection 2013.
Twenty-four dance couples performing at the 2011 IDSF (International DanceSport Federation) International Slovenia Open were divided into two groups: the first twelve placed couples (top ranked) and the last twelve placed couples (lower ranked). Video recordings were processed automatically using computer vision tracking algorithms under operator supervision to calculate movement parameters. Time and speed of movement were analysed during single natural (right) and reverse (left) turns performed during the Viennese waltz. Both top and lower ranked dancers tended to perform similar proportionate frequencies of reverse (≈ 35%) and natural (≈ 65%) turns. Analysis of reverse turns showed that the top ranked dancers performed less turns on a curved trajectory (16%) than the lower ranked dancers (33%). The top ranked couples performed all turns at similar speeds (F = 1.31, df = 3, p = 0.27; mean = 2.09m/s) all of which were significantly quicker than the lower ranked couples (mean = 1.94m/s), the greatest differences found for reverse turns (12.43% faster for curved trajectories, 8.42% for straight trajectories). This suggests that the ability to maintain a high speed in the more difficult turns, particularly the reverse turns on a curved trajectory, results in the overall dance appearing more fluent as the speed of movement does not fluctuate as much. This aspect of performance needs to be improved by lower ranked dancers if they wish to improve rating of their performance. Future research should determine which factors relate to the speed of turns.
24 对舞者在 2011 年国际体育舞蹈联合会（IDSF）国际斯洛文尼亚公开赛上进行表演，他们被分为两组：前 12 名（排名较高）和后 12 名（排名较低）。在操作员的监督下，使用计算机视觉跟踪算法自动处理视频记录，以计算运动参数。在维也纳华尔兹中，分析了单个自然（右）和反向（左）转弯时的运动时间和速度。顶尖舞者和较低排名的舞者都倾向于以相似的比例完成反向（≈35%）和自然（≈65%）转弯。对反向转弯的分析表明，顶尖舞者在曲线上执行的转弯次数（16%）比较低排名的舞者（33%）少。顶尖舞者以相似的速度执行所有转弯（F = 1.31，df = 3，p = 0.27；平均速度 = 2.09m/s），所有转弯速度都明显快于较低排名的舞者（平均速度 = 1.94m/s），其中反向转弯的差异最大（对于曲线轨迹，快 12.43%，对于直线轨迹，快 8.42%）。这表明，保持较高速度的能力，尤其是在更困难的转弯中，尤其是在曲线上的反向转弯，这使得整个舞蹈看起来更加流畅，因为运动速度不会波动太大。如果较低排名的舞者希望提高他们的评分，就需要提高转弯速度。未来的研究应该确定哪些因素与转弯速度有关。
