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首页> 外文期刊>Gait & posture >Energy cost of walking: A comparison of two recognised methods for defining steady state in a group of unimpaired children and children with cerebral palsy.
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Energy cost of walking: A comparison of two recognised methods for defining steady state in a group of unimpaired children and children with cerebral palsy.

机译：步行的能量成本：比较两种公认的方法来定义一组未受损儿童和脑瘫儿童的稳态。

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摘要

Measurement of VO(2) based 'energy cost of walking' indices provide quantitative information that can be used clinically to ascertain progress and relative functional impairment in pathology. The accuracy and validity of these indices relies on being able to identify periods of steady state conditions, since it is only in steady state that there is a direct and predictable relationship between VO(2) consumption and energy expenditure. This paper presents a comparison of two new mathematically based approaches that have recently gained recognition as methods for identifying steady state during an energy cost assessment. The first applies a mathematically defined threshold for steady state within a (non-treadmill) walking trial. This method is compared with a statistically based approach that relies on the calculation of the correlation coefficient, Kendall's Tau to define steady state data. To examine the impact of both methods on the calculation of the energy cost of walking, each was applied to the calculation of two oxygen based energy cost of walking parameters, the non-dimensional net oxygen cost and the net oxygen cost with speed normalised to height in a cohort of unimpaired subjects and children with cerebral palsy. The results revealed that overall there were no clinically significant differences between the two methods. It is suggested that the methods can be used interchangeably to calculate the energy cost of walking.
机译：基于VO（2）的“步行能量成本”指标的测量提供了定量信息，可在临床上用于确定病理的进展和相对功能损害。这些指标的准确性和有效性依赖于能够确定稳态条件的周期，因为只有在稳态下，VO（2）消耗与能源消耗之间存在直接且可预测的关系。本文对两种新的基于数学的方法进行了比较，这些方法最近已获得公认，可作为能源成本评估过程中确定稳态的方法。第一种方法适用于（非跑步机）步行试验中稳态的数学定义阈值。该方法与基于统计的方法相比较，后者基于相关系数Kendall's Tau的计算来定义稳态数据。为了检查这两种方法对步行能量消耗的计算的影响，将每种方法都应用于计算两个基于氧气的步行能量消耗参数，即无量纲净氧消耗和将速度归一化为高度的净氧消耗在未受损受试者和脑瘫患儿的队列中结果表明，两种方法总体上在临床上无显着差异。建议该方法可以互换使用，以计算步行的能源成本。

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