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首页> 外文期刊>Gait & posture >Light curtain for detecting footfall instants during treadmill walking--an exploratory study.
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Light curtain for detecting footfall instants during treadmill walking--an exploratory study.

机译：用于在跑步机行走过程中检测落脚瞬间的光幕-探索性研究。

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摘要

Footswitches, instrumented insoles, and forceplates are commonly used for detecting footfall instants during treadmill walking. This study aimed to explore the feasibility of using an optoelectronic light curtain for detecting initial foot contact (FC) and toe-off (TO) instants during treadmill walking. A commercial light curtain comprised of an array of parallel infrared light beams was installed 5 mm above the treadmill belt. Ten subjects walked on the treadmill at 0.5, 1.0 and 1.4 m/s and their gait was captured using seven optoelectronic cameras. Footswitches were secured over the heel and big toe of the right foot and the corresponding areas of the shoe. Footfall instants from the light curtain, markers, and foot footswitches were compared with the shoe footswitches serving as a criterion. The respective time differences were computed for each step and used to evaluate the agreement with the criterion and variability across subjects. FC instants from foot footswitches were on average within 10ms of the criterion. Both video and light curtain FC instants were detected at least 30 ms before the criterion. For TO, both the foot footswitches and video instants preceded the criterion. In contrast, the TO from the light curtain occurred >110 ms after the criterion but the variability was the smallest. The results indicated that using a light curtain for detecting footfall instants is feasible. The advantages of light curtain are relatively low cost, no subject preparations, and real-time signals. Greater accuracy is expected with further optimization of the setup.
机译：脚踏开关，仪表内底和测力板通常用于检测跑步机行走过程中的落脚瞬间。这项研究旨在探讨在跑步机行走过程中使用光电光幕检测初始脚接触（FC）和脚趾离开（TO）瞬间的可行性。在跑步机皮带上方5毫米处安装了由平行红外光束阵列组成的商用光幕。十名受试者以0.5、1.0和1.4 m / s的速度在跑步机上行走，并使用七个光电照相机捕获了他们的步态。脚踏开关固定在右脚的脚跟和大脚趾以及鞋子的相应区域上。将来自光幕，标记和脚踏开关的脚踩瞬间与作为标准的鞋式脚踏开关进行比较。为每个步骤计算各自的时间差，并将其用于评估标准与受试者之间的变异性的一致性。脚踏开关的FC瞬间平均在标准的10毫秒内。在该标准之前至少30毫秒检测到视频和光幕FC瞬间。对于TO，脚踏板和视频瞬间都在该标准之前。相比之下，来自光幕的TO发生在标准之后> 110 ms，但变异性最小。结果表明，使用光幕检测落脚瞬间是可行的。光幕的优点是成本相对较低，无需准备主体和实时信号。随着设置的进一步优化，有望获得更高的精度。

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