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首页> 外文期刊>Gait & posture >Number of strides required for reliable measurements of pace, rhythm and variability parameters of gait during normal and dual task walking in older individuals.
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Number of strides required for reliable measurements of pace, rhythm and variability parameters of gait during normal and dual task walking in older individuals.

机译：在老年人中进行正常和双重任务步行时，可靠地测量步态，节奏和变异性参数所需的步幅数。

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The reliability with which spatiotemporal gait parameters are measured has neither been well-established for variability parameters nor during dual task walking. The purpose of this study was to examine test-retest reliability of three gait parameters representing pace, rhythm and variability in healthy older persons during normal and dual task walking and to determine the number of strides necessary to measure the parameters reliably. Twenty-four healthy adults aged 65 or older participated in the study. Subjects walked during normal and dual task (backward spelling) walking conditions at self-selected speeds and then repeated the tests. Velocity, cadence and variability in stride velocity were measured with GAITRite instrumentation. Intraclass correlation coefficients (ICCs) were calculated and the numbers of strides required to meet desired magnitudes of reliability were estimated with the Spearman-Brown prophecy formula. ICCs for velocity and cadence were high (>0.841) during normal and dual task walking, indicating strong test-retest reliability. Test-retest reliability for variability in stride velocity was moderate (ICC=0.656) in normal walking and poor (ICC=0.226) in dual task walking. While data collected from fewer than 10 to 20 strides may reliably measure velocity and cadence in either normal or dual task walking, measuring variability in stride velocity reliably may require that data be collected from hundreds of strides, particularly in dual task walking.
机译：对于可变性参数或在双任务步行期间，测量时空步态参数的可靠性尚未很好地确立。这项研究的目的是检验正常和双重任务步行过程中健康老年人的三个步态参数的重测信度，并确定可靠测量这些参数所需的步幅。 24名65岁以上的健康成人参加了这项研究。在正常和双重任务（向后拼写）步行条件下，受试者以自行选择的速度行走，然后重复测试。用GAITRite仪器测量步速的速度，节奏和变化。计算了类内相关系数（ICC），并使用Spearman-Brown预言公式估算了满足所需可靠性等级所需的步幅数。在正常和双重任务步行过程中，ICC的速度和韵律较高（> 0.841），表明重测信度很强。在正常行走中步速变化的重测信度为中等（ICC = 0.656），在双任务行走中差（ICC = 0.226）。虽然从少于10到20个步幅收集的数据可以可靠地测量正常或双重任务步行中的速度和节奏，但可靠地测量步幅速度的变化可能需要从数百个步幅中收集数据，尤其是在双重任务步行中。

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