| Non-Invasive Measurement of Physiological Signals on a Modified Home Bathroom Scale. | |
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MedLine Citation:
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PMID: 22318479 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A commercial bathroom scale with both handlebar and footpad electrodes was modified to enable measurement of four physiological signals: the ballistocardiogram (BCG), electrocardiogram (ECG), lower-body impedance plethysmogram (IPG), and lower-body electromyogram (EMG). The BCG, which describes the reaction of the body to cardiac ejection of blood, was measured using the strain gauges in the scale. The ECG was detected using handlebar electrodes with a two-electrode amplifier. For the lower-body IPG, the two electrodes under the subjects toes were driven with an alternating-current stimulus, and the resulting differential voltage across the heels was measured and demodulated synchronously with the source. The voltage signal from the same two footpad electrodes under the heels were passed through a passive low-pass filter network into another amplifier, and the output was the lower-body EMG signal. The signals were measured from nine healthy subjects, and the average signal-tonoise ratio (SNR) while the subjects were standing still was estimated for the four signals as follows: BCG, 7.6 dB; ECG, 15.8 dB; IPG, 10.7 dB. During periods of motion, the decrease in SNR for the BCG signal was found to be correlated to the increase in rms power for the lower-body EMG (r = 0.89, p < 0.01). The EMG could thus be used to flag noise-corrupted segments of the BCG, increasing the measurement robustness. This setup could be used for monitoring the cardiovascular health of patients at home. |
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Authors:
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O Inan; D Park; L Giovangrandi; G Kovacs |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-03 |
Journal Detail:
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Title: IEEE transactions on bio-medical engineering Volume: - ISSN: 1558-2531 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0012737 Medline TA: IEEE Trans Biomed Eng Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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