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Effect of respiration and exercise on seismocardiographic signals.
Comput Biol Med
December 2024
Department of Mechanical and Aerospace Engineering, University of Central Florida, and the Biomedical Acoustics Research Company, 32816, Orlando, FL, USA.
Background: Seismocardiographic signals (SCG) are chest wall vibrations induced by mechanical cardiac activities. This study investigated the morphological changes in the SCG signal due to respiration and exercise.
Methods: Fifteen healthy subjects were recruited, and SCG was acquired before and after exercise.
SCG variability and spectral energy distribution during normal breathing and breath hold at different lung volumes and airway pressures.
Sci Rep
August 2024
Biomedical Acoustic Research Lab, University of Central Florida, Orlando, FL, USA.
Seismocardiographic (SCG) signals are chest wall vibrations induced by cardiac activity and are potentially useful for cardiac monitoring and diagnosis. SCG waveform is observed to vary with respiration, but the mechanism of these changes is poorly understood as alterations in autonomic tone, lung volume, heart location and intrathoracic pressure are all varying during the respiratory cycle. Understanding SCG variability and its sources may help reduce variability and increase SCG clinical utility.
View Article and Find Full Text PDFMotion noise cancellation in seismocardiogram of ambulant subjects with dual sensors.
Annu Int Conf IEEE Eng Med Biol Soc
August 2016
This paper presents a dual-sensor method of extracting seismocardiographic (SCG) data from moving adult subjects using chest-worn wireless MEMS accelerometers. A digital signal processing (DSP) system including a normalized least means square (NLMS) adaptive filter is designed and tested in MATLAB. Data results from 10 subjects indicate a detection rate of 98.
View Article and Find Full Text PDFUnified frame of reference improves inter-subject variability of seismocardiograms.
Biomed Eng Online
February 2015
Department of Electrical Engineering and Automation, Aalto University, P.O. BOX: FI-13340, 00076, Helsinki, Finland.
Background: Seismocardiography is the noninvasive measurement of cardiac vibrations transmitted to the chest wall by the heart during its movement. While most applications for seismocardiography are based on unidirectional acceleration measurement, several studies have highlighted the importance of three-dimensional measurements in cardiac vibration studies. One of the main challenges in using three-dimensional measurements in seismocardiography is the significant inter-subject variability of waveforms.
View Article and Find Full Text PDFAutonomic regulation of circulation and cardiac contractility during a 14-month space flight.
Acta Astronaut
May 1999
Institute of Biomedical Problems, Moscow, Russia.
The space flight of physician cosmonaut V.V. Polyakov, the longest to date (438 days), has yielded new data about human adaptation to long-term weightlessness.
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