Energy expenditure does not explain step length-width choices during walking
Energy expenditure does not explain step length-width choices during walking
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能量消耗并不能解释步行时步长和宽度的选择
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
K. Gordon
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文献类型：
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作者：
Stephen A. Antos;Konrad Paul Kording;K. Gordon
健康的年轻人有一个最喜欢的步行速度，步长，和步宽接近能量最佳。然而，人们可以选择以多种不同的步长和宽度行走，这可能在能量消耗和偏好方面有所不同。在这里，我们进一步调查步长宽度的偏好和他们的关系，以能源消耗。随着越来越多的研究，我们假设人们喜欢的踏步模式不能完全用代谢能量消耗来解释。为了验证这一假设，我们使用了一个两种选择的强迫选择范式。15名参与者在一个超大的跑步机上行走。每个试验参与者都经历了两种踏步模式，然后选择他们喜欢的模式。随着时间的推移，我们调整了选择，使选择一种模式的机会达到50%（同样首选）。如果人们的偏好仅仅基于代谢能量消耗，那么这些同样偏好的踏步模式应该具有相同的能量消耗。我们发现能量消耗在同样优选的步长-宽度模式中存在差异（p < 0.001）。平均而言，具有较高能量消耗的较长步骤优于具有较低能量消耗的较短和较宽步骤（p < 0.001）。我们还要求参与者对一组较短、较宽和较长的步骤进行排名，从最喜欢的到最不喜欢的，从消耗最多的能量到消耗最少的能量。只有7/15的参与者在他们的偏好和感知能量消耗方面有相同的排名。我们的研究结果表明，能量消耗不是影响一个人有意识的步态选择的唯一因素。
Healthy young adults have a most preferred walking speed, step length, and step width that are close to energetically optimal. However, people can choose to walk with a multitude of different step lengths and widths, which can vary in both energy expenditure and preference. Here we further investigate step length-width preferences and their relationship to energy expenditure. In line with a growing body of research, we hypothesized that people’s preferred stepping patterns would not be fully explained by metabolic energy expenditure. To test this hypothesis we used a two-alternative forced-choice paradigm. Fifteen participants walked on an oversized treadmill. Each trial participants experienced two stepping patterns and then chose the pattern they preferred. Over time, we adapted the choices such that there was 50% chance of choosing one pattern over another (equally preferred). If people’s preferences are based solely on metabolic energy expenditure, then these equally preferred stepping patterns should have equal energy expenditure. We found that energy expenditure differed across equally preferred step length-width patterns (p < 0.001). On average, longer steps with higher energy expenditures were preferred over shorter and wider steps with lower energy expenditures (p < 0.001). We also asked participants to rank a set of shorter, wider, and longer steps from most preferred to least preferred, and from most energy expended to least energy expended. Only 7/15 participants had the same rankings for their preferences and perceived energy expenditure. Our results suggest that energy expenditure is not the only factor influencing a person’s conscious gait choices.