Why the study?
Does a chest-worn 5.8 GHz SILO tag device accurately detect cardiac intervals and estimate HRV compared to ECG in a person in motion?
Does a chest-worn 5.8 GHz SILO tag device accurately detect cardiac intervals and estimate HRV compared to ECG in a person in motion?
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A novel non-contact chest-worn 5.8 GHz SILO tag device can accurately monitor heart rate variability during physical activity, showing close agreement with standard ECG.
This article presents a chest-worn device for monitoring the heart rate variability (HRV) of a person in motion without direct contact with the skin. The device operates at 5.8 GHz and mainly consists of a self-injection-locked oscillator (SILO) and a tag antenna. The device transmits the output signal of an SILO that is frequency-modulated (FM) by the Doppler effect of the physiological movement of the chest via the tag antenna to a remote FM receiver. Accordingly, the heartbeat is detected and the HRV can be estimated. The tag antenna comprises a circularly polarized ring slot antenna and a split-ring resonator (SRR) array in stack to enhance sensing directivity while reducing the moving clutter in the joint sensing and transmission process. For validation, an HRV monitoring system was developed, based on the proposed device, to detect the cardiac intervals of a wearer who performs various activities, including walking and running. The results thus obtained agree closely with electrocardiogram (ECG) measurements.
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Arif et al. (2022) studied this question.
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