IRCCS Fondazione Santa Lucia, Italy.
IRCCS Fondazione Santa Lucia, Italy; Department of Psychology, Sapienza University of Rome, Rome, Italy.
Neurosci Lett. 2019 Apr 23;699:127-133. doi: 10.1016/j.neulet.2019.01.052. Epub 2019 Jan 30.
Walking is a repeatable and cyclic locomotor act, presenting standardized biomechanical patterns within the gait cycle in healthy humans. Specifically, both stance and swing durations exhibit high reliability at comfortable speed, maintaining the same proportion between the twos with respect to different contextual features in forward walking. Recently, it was found that this proportion is close to the "golden ratio" (a well-known irrational number equal to 1.618…). While few studies analysed how this ratio is modified due to different contextual factors, no studies are available about different locomotor acts. Thus, aim of the study is to verify whether and how the stance-to-swing ratio is modified during the execution of different locomotor tasks. Twenty healthy young subjects were asked to perform different tasks: forward walking, backward walking, lateral walking, stepping in place, stair ascending and descending, while wearing baropodometric shoe insoles. All tests were performed at comfortable speed, while forward walking was also tested at slow and fast speed. The stance-to-swing ratio did not differ significantly from the golden ratio in forward comfortable walking, backward walking and stair descending. A cluster analysis identified the most frequent cluster centered at 1.63, a value close to the golden ratio. These results supported the idea that golden ratio is the preferred stance-to-swing ratio modality, but at the same time this ratio could be adapted in response to particular contextual requests.
行走是一种可重复的周期性运动行为，在健康人类的步态周期中呈现出标准化的生物力学模式。具体来说，在舒适的速度下，站立和摆动持续时间都具有很高的可靠性，两者之间的比例保持不变，与前进行走中的不同上下文特征相对应。最近，人们发现这个比例接近“黄金比例”（一个著名的无理数，等于 1.618…）。虽然很少有研究分析这个比例如何因不同的上下文因素而改变，但关于不同的运动行为还没有研究。因此，本研究旨在验证在执行不同的运动任务时，站立到摆动的比例是否以及如何发生变化。二十名健康的年轻受试者被要求执行不同的任务：前进行走、后退行走、侧向行走、原地踏步、上下楼梯，同时穿着足压式鞋内底。所有测试都是在舒适的速度下进行的，而前进行走的测试还包括慢走和快走。在舒适的前进行走、后退行走和下楼梯中，站立到摆动的比例与黄金比例没有显著差异。聚类分析确定了以 1.63 为中心的最常见聚类，这是一个接近黄金比例的值。这些结果支持了黄金比例是首选的站立到摆动比例模式的观点，但同时，这个比例可以根据特定的上下文请求进行调整。
