Wearable radio-frequency sensing of respiratory rate, respiratory volume, and heart rate
Wearable radio-frequency sensing of respiratory rate, respiratory volume, and heart rate
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DOI：
10.1038/s41746-020-0307-6
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发表时间：
2020-07-28
影响因子：
15.2
通讯作者：
Kan, Edwin C.
中科院分区：
文献类型：
--
作者：
Sharma, Pragya;Hui, Xiaonan;Kan, Edwin C.
许多健康诊断系统需要对呼吸频率、呼吸量和心率进行非侵入性检测，并具有很高的用户舒适度。以前的方法通常需要多个传感器，包括皮肤触摸电极、张力带或附近的离体式阅读器，因此不舒服或不方便。本文介绍了一项对20名健康受试者(14名女性)进行不同姿势的自愿呼吸练习的外套可穿戴式射频传感器的研究。通过近场相干传感原理，在参与者身上放置了两个原型传感器，一个靠近心脏，另一个在剑突下方，以耦合来自心、肺和横隔膜的运动。对于心率(r=0.95)、呼吸频率(r=0.93)和呼吸量(r=0.84)这三个生命体征，我们的传感器与参考装置可以获得令人满意的相关性。我们还检测到了自主屏气期，准确率为96%。此外，受试者在屏气的同时通过向内收缩腹部进行呼吸练习，导致等容条件下矛盾的胸腔向外运动，检测准确率为83%。
Many health diagnostic systems demand noninvasive sensing of respiratory rate, respiratory volume, and heart rate with high user comfort. Previous methods often require multiple sensors, including skin-touch electrodes, tension belts, or nearby off-the-body readers, and hence are uncomfortable or inconvenient. This paper presents an over-clothing wearable radio-frequency sensor study, conducted on 20 healthy participants (14 females) performing voluntary breathing exercises in various postures. Two prototype sensors were placed on the participants, one close to the heart and the other below the xiphoid process to couple to the motion from heart, lungs and diaphragm, by the near-field coherent sensing principle. We can achieve a satisfactory correlation of our sensor with the reference devices for the three vital signs: heart rate (r=0.95), respiratory rate (r=0.93) and respiratory volume (r=0.84). We also detected voluntary breath-hold periods with an accuracy of 96%. Further, the participants performed a breathing exercise by contracting abdomen inwards while holding breath, leading to paradoxical outward thorax motion under the isovolumetric condition, which was detected with an accuracy of 83%.