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Abstract：
This study aimed to determine the effect of different percentages of body weight support (BWS) on spatiotemporal step characteristics during running. 26 endurance runners (age: 37 ± 9 years) completed a running treadmill protocol consisting of 6 different conditions (BWS combinations: 0-50%), with velocity maintained at 12 km/h. Each condition lasted 1 minute. Step angle, ground contact time (CT), flight time (FT), step length (SL) and frequency (SF), and duration of phases during stance time (phase1: initial contact; phase2: midstance; phase3: propulsion) were measured for every step during the test using a photoelectric cell system. Compared with the baseline condition (100% BW), FT was longer, CT was shorter, SL was longer, SF was lower, and the step angle was higher with each increase in BWS (p < 0.05). Also, some changes were observed in the duration of phases during stance time: phase1 did not experience changes across experimental conditions (p = 0.096), phase2 decreased and phase3 increased as BW was supported (p < 0.05). These results indicate that as BW was supported, runners showed longer FT and SL, shorter CT, lower SF, and greater step angle as well as some changes in the phases during the ground contact. Therefore, this study highlights the effect of different percentages of BWS on spatiotemporal parameters.
摘要：
这项研究旨在确定不同百分比的体重支持（BWS）对跑步过程中时空步骤特征的影响。26名耐力跑步者（年龄：37±9岁）完成了由6种不同条件组成的跑步机方案（BWS组合：0-50％），速度保持在12公里/小时。每个条件持续1分钟。步进角,接地时间(CT),飞行时间（FT），步长(SL)和频率(SF)，在测试过程中，使用光电电池系统测量了每个步骤的站立时间和持续时间（阶段1：初始接触；阶段2：中期；阶段3：推进）。与基线条件(100%BW)相比,FT更长，CT较短,SL更长，SF较低，步距角随着BWS的增加而增大(p<0.05)。此外，在站立时间期间的阶段的持续时间中观察到一些变化：阶段1没有经历跨实验条件的变化（p=0.096），随着BW的支持，Phase2降低，Phase3升高（p<0.05）。这些结果表明，由于BW得到了支持，跑步者表现出更长的FT和SL，CT较短,较低的SF，和更大的步进角以及在地面接触期间相位的一些变化。因此,本研究强调了不同BWS百分比对时空参数的影响。
