Department of Human Movement Sciences, Faculty of Behavioral and Movement Sciences, Amsterdam Movement Sciences Research Institute, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, Amsterdam 1081 BT, the Netherlands.
Department of Human Movement Sciences, Faculty of Behavioral and Movement Sciences, Amsterdam Movement Sciences Research Institute, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, Amsterdam 1081 BT, the Netherlands; Faculty of Health, Centre of Expertise Urban Vitality, Amsterdam University of Applied Sciences, Amsterdam, Tafelbergweg 51, Amsterdam 1105 BD, the Netherlands.
Gait Posture. 2024 Oct;114:78-83. doi: 10.1016/j.gaitpost.2024.09.005. Epub 2024 Sep 10.
Both the Short Physical Performance Battery (SPPB) and daily life gait quality and quantity obtained from wearable sensors are used to measure functional status in older adults. It is generally assumed that they are interrelated and exchangeable, but this has not yet been established. Interchangeability of these measures would pave the way for remote monitoring of functional status.
Are the SPPB and daily life gait quality and quantity measures correlated in community-dwelling older adults?
The SPPB and gait quality and quantity data of 229 community-dwelling adults of 65 years or older were collected. The SPPB is a combined score of the Three Stage Balance test, Four Meter Walk test, and Five Times Sit to Stand test and ranges from 0 to 12. Participants wore a tri-axial inertial sensor for one week to assess gait quality (e.g. gait stability and smoothness) and quantity (e.g. number of strides). Correlation coefficients between SPPB scores and gait quality and quantity measures were assessed using Spearman's correlation.
The median age of the study population was 76.2 years (IQR 72.6-81.0), and 76 % were women (n=175). The median SPPB score was 10 (IQR 8-11). Spearman's correlation coefficients between the SPPB and gait quality and quantity measures were all below 0.3.
A possible explanation for the observed weak correlations is that the SPPB reflects one's maximal capacity, while gait quality and quantity reflect the submaximal performance in daily life. The SPPB and gait quality and quantity seem therefore distinct constructs with complementary value, rather than interchangeable. A more comprehensive understanding of functional status might be achieved by combining the SPPB assessment of standardized activities with the evaluation of inertial sensor measurements obtained during daily life activities.
短体适能电池（SPPB）和可穿戴传感器获取的日常生活步态质量和数量都被用于测量老年人的功能状态。一般认为它们是相互关联和可互换的，但这尚未得到证实。这些测量方法的互换性将为功能状态的远程监测铺平道路。
在社区居住的老年人中，SPPB 和日常生活步态质量和数量测量值是否相关？
收集了 229 名 65 岁或以上的社区居住成年人的 SPPB 和步态质量和数量数据。SPPB 是三项平衡测试、四米步行测试和五次坐立站测试的综合评分，范围为 0 至 12 分。参与者佩戴三轴惯性传感器一周，以评估步态质量（例如步态稳定性和流畅性）和数量（例如步数）。使用 Spearman 相关系数评估 SPPB 评分与步态质量和数量测量值之间的相关系数。
研究人群的中位年龄为 76.2 岁（IQR 72.6-81.0），76%为女性（n=175）。中位 SPPB 评分为 10（IQR 8-11）。SPPB 与步态质量和数量测量值之间的 Spearman 相关系数均低于 0.3。
观察到的弱相关性的一个可能解释是，SPPB 反映了一个人的最大能力，而步态质量和数量反映了日常生活中的亚最大表现。因此，SPPB 和步态质量和数量似乎是具有互补价值的不同构念，而不是可互换的。通过将标准化活动的 SPPB 评估与日常生活活动中获得的惯性传感器测量值的评估相结合，可能会对功能状态有更全面的理解。
