Department of Health and Rehabilitation sciences, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Kingdom of Saudi Arabia.
Department of Physical Therapy, University of Pittsburgh, Bridgeside Point 1, 100 Technology Drive, Suite 210, Pittsburgh, PA, 15219, USA.
BMC Geriatr. 2020 Feb 28;20(1):82. doi: 10.1186/s12877-020-1489-0.
In the last few decades, research related to balance in older adults has been conducted in lab-based settings. The lack of portability and high cost that is associated with the current gold standard methods to quantify body balance limits their application to community settings such as independent living facilities. The purpose of the study was to examine the relative and absolute reliability and the convergent validity of static standing balance performance using an accelerometer device.
A total of 131 participants (85% female, mean age 80 ± 8 years) were included for the validity aim, and a subsample of 38 participants were enrolled in the reliability testing (89% female, mean age 76 ± 7 years). The root-mean-square (RMS) and normalized path length (NPL) for sway in antero-posterior (AP) and medio-lateral (ML) directions were calculated for different standing balance conditions. Test-retest reliability was assessed over two testing visits occurring 1 week apart using the intraclass correlation coefficient (ICC) for relative reliability, and the minimal detectable change (MDC) was calculated for the absolute reliability. Spearman's rank correlation coefficient was used to test convergent validity at baseline between balance measurements and related mobility measures.
Reliability of balance performance using accelerometers was good to excellent with ICC values ranging from 0.41 to 0.83 for RMS sway and from 0.49 to 0.82 for NPL sway. However, the ICC during semi-tandem stance in A-P direction was 0.35, indicating poor reliability. The MDC of the sway measurements ranged from 2.4 to 9.4 for the RMS and 5.2 to 13.8 for the NPL. Balance measurements were correlated with mobility measurements.
Using a portable accelerometer to quantify static standing postural control provides reliable measurements in community settings.
在过去的几十年中，针对老年人平衡的研究都是在基于实验室的环境中进行的。目前用于量化身体平衡的金标准方法便携性差且成本高，这限制了它们在社区环境（如独立生活设施）中的应用。本研究的目的是使用加速度计设备来检验静态站立平衡性能的相对和绝对可靠性以及收敛效度。
共有 131 名参与者（85%为女性，平均年龄 80±8 岁）被纳入有效性研究，其中 38 名参与者被纳入可靠性测试（89%为女性，平均年龄 76±7 岁）。分别计算前后（AP）和左右（ML）方向上摆动的均方根（RMS）和归一化路径长度（NPL），用于不同的站立平衡条件。使用组内相关系数（ICC）评估两次测试间隔 1 周的测试-重测可靠性，计算绝对可靠性的最小可检测变化（MDC）。使用 Spearman 秩相关系数在基线时检验平衡测量值与相关移动性测量值之间的收敛效度。
使用加速度计评估平衡性能的可靠性为良好到优秀，RMS 摆动的 ICC 值范围为 0.41 到 0.83，NPL 摆动的 ICC 值范围为 0.49 到 0.82。然而，在半前后姿势的 A-P 方向上，ICC 值为 0.35，表明可靠性较差。摆动测量的 MDC 值范围为 RMS 的 2.4 到 9.4，NPL 的 5.2 到 13.8。平衡测量值与移动性测量值相关。
使用便携式加速度计来量化静态站立姿势控制提供了在社区环境中可靠的测量。
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