Evaluation of a fall detector based on accelerometers: a pilot study
Evaluation of a fall detector based on accelerometers: a pilot study
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DOI：
10.1007/bf02351026
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发表时间：
2005-09-01
影响因子：
3.2
通讯作者：
Becker, C
中科院分区：
文献类型：
--
作者：
Lindemann, U;Hock, A;Becker, C
由于福尔斯和与跌倒相关的伤害仍然是公共卫生领域的主要挑战，因此对福尔斯的可靠和立即检测是重要的，以便能够提供足够的医疗支持。现有的家庭报警系统被放置在臀部，但有几个缺点。开发了一种基于加速度计并放置在头部水平的跌倒检测器，以及一种能够区分日常生活活动和模拟福尔斯的算法。加速度计被集成到助听器外壳中，该外壳被固定在耳朵后面。跌倒检测的灵敏度进行了评估，通过调查的加速度模式的年轻志愿者在故意福尔斯。通过调查同一志愿者的日常生活活动来评估特异性。此外，一名健康的老年女性（83岁）在白天佩戴了该传感器。确定了三个触发阈值，以便可以识别跌倒。xy平面中的加速度的和矢量高于2g，撞击前所有空间分量的速度的和矢量高于0.7m s（-1）;以及所有空间分量的加速度的和矢量高于6 g。该算法能够区分日常生活活动与故意福尔斯。因此，可以证明该算法的高灵敏度和特异性优于在相同开发阶段佩戴在臀部或手腕处的其他跌倒检测器。
As falls and fall-related injuries remain a major challenge in the public health domain, reliable and immediate detection of falls is important so that adequate medical support can be delivered. Available home alarm systems are placed on the hip, but have several shortcomings. A fall detector based on accelerometers and placed at head level was developed, as well as an algorithm able to distinguish between activities of daily living and simulated falls. Accelerometers were integrated into a hearing-aid housing, which was fixed behind the ear. The sensitivity of the fall detection was assessed by investigation into the acceleration patterns of the head of a young volunteer during intentional falls. The specificity was assessed by investigation into activities of daily living of the same volunteer. In addition, a healthy elderly woman (83 years) wore the sensor during the day. Three trigger thresholds were identified so that a fall could be recognised. the sum-vector of acceleration in the xy-plane higher than 2 g, the sum-vector of velocity of all spatial components right before the impact higher than 0.7 m s(-1); and the sum-vector of acceleration of all spatial components higher than 6g. The algorithm was able to discriminate activities of daily living from intentional falls. Thus high sensitivity and specificity of the algorithm could be demonstrated that was better than in other fall detectors worn at the hip or wrist at the same stage of development.