Rowe Justin B, Friedman Nizan, Chan Vicky, Cramer Steven C, Bachman Mark, Reinkensmeyer David J
Annu Int Conf IEEE Eng Med Biol Soc. 2014;2014:4087-90. doi: 10.1109/EMBC.2014.6944522.
Wrist-worn accelerometers are becoming more prevalent as a means to assess use of the impaired upper extremity in daily life after stroke. However, wrist accelerometry does not measure joint movements of the hand, which are integral to functional use of the upper extremity. In this study, we used a custom-built, non-obtrusive device called the manumeter to measure both arm use (via wrist accelerometry) and hand use (via finger magnetometry) of a group of unimpaired subjects while they performed twelve motor tasks at three intensities. We also gave the devices to four stroke subjects and asked them to wear them for six hours a day for one month. From the in-lab testing we found that arm use was a strong predictor of hand use for individual tasks, but that the slope of the relationship varied by up to a factor of ~12 depending on the task being performed. Consistent with this, in the daily use data collected from stroke subjects we found a broad spread in the relationship between arm and hand use. These results suggest that analyzing the spread of the relationship between daily hand and arm use will give more insight into upper extremity recovery than wrist accelerometry or finger magnetometry alone, because the spread reflects the nature of the daily tasks performed as well as the amount of upper extremity use.
腕部佩戴式加速度计作为评估中风后日常生活中上肢功能受损使用情况的一种手段，正变得越来越普遍。然而，腕部加速度测量法无法测量手部的关节运动，而手部关节运动是上肢功能使用不可或缺的部分。在本研究中，我们使用了一种定制的、不引人注意的设备——手部活动测量仪，在一组未受损的受试者执行三种强度的十二项运动任务时，测量他们的手臂使用情况（通过腕部加速度测量法）和手部使用情况（通过手指磁力测量法）。我们还将这些设备交给四名中风患者，并要求他们每天佩戴六小时，持续一个月。通过实验室测试，我们发现对于个体任务而言，手臂使用情况是手部使用情况的一个有力预测指标，但根据所执行的任务不同，两者关系的斜率变化幅度高达约12倍。与此一致的是，在从中风患者收集的日常使用数据中，我们发现手臂和手部使用之间的关系存在很大差异。这些结果表明，分析日常手部和手臂使用之间关系的差异，将比单独使用腕部加速度测量法或手指磁力测量法更能深入了解上肢恢复情况，因为这种差异反映了所执行日常任务的性质以及上肢的使用量。
