文章基本信息

标题：Duty Factor Is a Viable Measure to Classify Spontaneous Running Forms
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作者：Aurélien Patoz , , Cyrille Gindre , Adrien Thouvenot , , Laurent Mourot , , Kim Hébert-Losier ; Thibault Lussiana
期刊名称：Sports
电子版ISSN：2075-4663
出版年度：2019
卷号：7
期号：11
页码：1-6
DOI：10.3390/sports7110233
出版社：MDPI Publishing
摘要：Runners were classified using two different methods based on their spontaneous running form: (1) subjectively using the V®score from the Volodalen® scale, leading to terrestrial and aerial groups; and (2) objectively using the duty factor (DF), leading to high (DFhigh) and low (DFlow) DF groups. This study aimed to compare these two classification schemes. Eighty-nine runners were divided in two groups using the V®score (VOL groups) and were also ranked according to their DF. They ran on a treadmill at 12 km·h−1 with simultaneous recording of running kinematics, using a three-dimensional motion capture system. DF was computed from data as the ratio of ground contact time to stride time. The agreement (95% confidence interval) between VOL and DF groups was 79.8% (69.9%, 87.6%), with relatively high sensitivity (81.6% (68.0%, 91.2%)) and specificity (77.5% (61.6%, 89.2%)). Our results suggest that the DF and V®score reflect similar constructs and lead to similar subgroupings of spontaneous running form (aerial runners if DF < 27.6% and terrestrial runners if DF > 28.8% at 12 km·h−1). These results suggest that DF could be a useful objective measure to monitor real-time changes in spontaneous running form using wearable technology. As a forward-looking statement, spontaneous changes in running form during racing or training could assist in identifying fatigue or changes in environmental conditions, allowing for a better understanding of runners.
关键词：running; biomechanics; running form running ; biomechanics ; running form