Heart rate detection from single-foot plantar bioimpedance measurements in a weighing scale
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Document typeConference report
PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessRestricted access - publisher's policy
Electronic bathroom scales are an easy-to-use, affordable mean to measure physiological parameters in addition to body weight. They have been proposed to obtain the ballistocardiogram (BCG) and derive from it the heart rate, cardiac output and systolic blood pressure. Therefore, weighing scales may suit intermittent monitoring in e-health and patient screening. Scales intended for bioelectrical impedance analysis (BIA) have also been proposed to estimate the heart rate by amplifying the pulsatile impedance component superimposed on the basal impedance. However, electronic weighing scales cannot easily obtain the BCG from people that have a single leg neither are bioimpedance measurements between both feet recommended for people wearing a pacemaker or other electronic implants, neither for pregnant women. We propose a method to detect the heart rate (HR) from bioimpedance measured in a single foot while standing on an bathroom weighting scale intended for BIA. The electrodes built in the weighing scale are used to apply a 50 kHz voltage between the outer electrode pair and to measure the drop in voltage across the inner electrode pair. The agreement with the HR simultaneously obtained from the ECG is excellent. We have also compared the drop in voltage across the waist and the thorax with that obtained when measuring bioimpedance between both feet to compare the possible risk of the proposed method to that of existing BIA scales.
CitationDíaz, D.; Casas, J.; Pallàs Areny, R. Heart rate detection from single-foot plantar bioimpedance measurements in a weighing scale. A: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. "32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBS) :". Buenos Aires: IEEE Press. Institute of Electrical and Electronics Engineers, 2010, p. 6489-6492.
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