Quantifying and reducing motion artifacts in wearable seismocardiogram measurements during walking to assess left ventricular health

Abdul Q. Javaid*, Hazar Ashouri, Alexis Dorier, Mozziyar Etemadi, J. Alex Heller, Shuvo Roy, Omer T. Inan

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Goal: Our objective is to provide a framework for extracting signals of interest from the wearable seismocardiogram (SCG) measured during walking at normal (subject's preferred pace) and moderately fast (1.34-1.45 m/s) speeds. Methods: We demonstrate, using empirical mode decomposition (EMD) and feature tracking algorithms, that the pre-ejection period (PEP) can be accurately estimated from a wearable patch that simultaneously measures electrocardiogram and sternal acceleration signals.We also provide a method to determine the minimum number of heartbeats required for an accurate estimate to be obtained for the PEP from the accelerometer signals during walking. Results: The EMD-based denoising approach provides a statistically significant increase in the signal-to-noise ratio of wearable SCG signals and also improves estimation of PEP during walking. Conclusion: The algorithms described in this paper can be used to provide hemodynamic assessment from wearable SCG during walking. Significance: A major limitation in the use of the SCG, a measure of local chest vibrations caused by cardiac ejection of blood in the vasculature, is that a user must remain completely still for high-quality measurements. The motion can create artifacts and practically render the signal unreadable. Addressing this limitation could allow, for the first time, SCG measurements to be obtained reliably during movement-aside from increasing the coverage throughout the day of cardiovascular monitoring, analyzing SCG signals during movement would quantify the cardiovascular system's response to stress (exercise), and thus provide a more holistic assessment of overall health.

Original languageEnglish (US)
Article number7544494
Pages (from-to)1277-1286
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume64
Issue number6
DOIs
StatePublished - Jun 2017

Keywords

  • Empirical mode decomposition (EMD)
  • Seismocardiography
  • Smart and connected health
  • Wearable technology

ASJC Scopus subject areas

  • Biomedical Engineering

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