One reason for the controversial discussion of whether the dual task (DT) walking paradigm has an added value for diagnosis in clinical conditions might be the use of different gait measurement systems. Therefore, the purpose was 1) to detect DT effects of central gait parameters obtained from five different gait analysis devices in young and old adults, 2) to assess the consistency of the measurement systems, and 3) to determine if the absolut and proportional DT costs (DTC) are greater than the system-measurement error under ST. Twelve old (72.2 ± 7.9y) and 14 young adults (28.3 ± 6.2y) walked a 14.7-m distance under ST and DT at a self-selected gait velocity. Interrater reliability, precision of the measurement and sensitivity to change were calculated under ST and DT. An age effect was observed in almost all gait parameters for the ST condition. For DT only differences for stride length (p < .029, ɳ2p = .239) as well as single and double limb support (p = .036, ɳ2p = .227; p = .034, ɳ2p = .218) remained. The measurement systems showed a lower absolute agreement compared to consistency across all systems. When reporting DT effects, the real changes in performance and random measurement errors should always be accounted for. These findings have strong implications for interpreting DT effects.

中文翻译：

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具有双重任务范式的步态分析系统在健康年轻人和老年人中的评估者间可靠性研究

关于双重任务（DT）步行范式是否对临床诊断具有附加价值的争议性讨论的一个原因可能是使用不同的步态测量系统。因此，目的是 1）检测从五种不同步态分析设备获得的青年和老年人中心步态参数的 DT 效应，2）评估测量系统的一致性，以及 3）确定绝对和比例 DT成本 (DTC) 大于 ST 下的系统测量误差。12 名老年人 (72.2 ± 7.9 岁) 和 14 名年轻人 (28.3 ± 6.2 岁) 在 ST 和 DT 下以自选步态速度行走 14.7 米。在 ST 和 DT 下计算评估者间信度、测量精度和对变化的敏感性。在 ST 条件下，几乎所有步态参数都观察到了年龄效应。对于 DT，仅存在步幅 (p < .029, ɳ2p = .239) 以及单肢和双肢支撑 (p = .036, ɳ2p = .227; p = .034, ɳ2p = .218) 的差异。与所有系统的一致性相比，测量系统的绝对一致性较低。在报告 DT 效应时，应始终考虑性能的实际变化和随机测量误差。这些发现对解释 DT 效应具有重要意义。应始终考虑性能的实际变化和随机测量误差。这些发现对解释 DT 效应具有重要意义。应始终考虑性能的实际变化和随机测量误差。这些发现对解释 DT 效应具有重要意义。