Key result
A smartphone accelerometer placed on the xiphoid process accurately measured heartbeat and respiratory intervals simultaneously compared to electrocardiograph and spirometer measurements.
Why the study?
Can a smartphone accelerometer accurately measure heartbeat and respiratory intervals compared to standard electrocardiograph and spirometer?
Can a smartphone accelerometer accurately measure heartbeat and respiratory intervals compared to standard electrocardiograph and spirometer?
A smartphone accelerometer placed on the chest can accurately measure heartbeat and respiratory intervals, enabling potential applications in monitoring Heart Rate Variability and Respiratory Sinus Arrhythmia.
May enable accessible cardiorespiratory monitoring; leaves open validation in larger clinical cohorts before adoption.
In this paper, a method based on the usage of a smartphone for measuring simultaneously both heartbeat intervals and respiratory intervals is presented. In particular, the commodity accelerometer of a smartphone is used for measuring the seismocardiographic signal generated by heart activity and the acceleration due to breathing movements. The measurement is performed with the subject laying down, placing the smartphone on his/her xiphoid process. Signal processing algorithms are presented in the paper that can produce an accurate estimation of heartbeat and respiratory intervals from the measured acceleration signals. A metrological validation of the heartbeat and respiratory intervals estimates obtained with the proposed method is carried out by comparison with measurements obtained using an electrocardiograph and a spirometer. Two practical examples of applications of the measured quantities are finally reported, that are the measurement of the Heart Rate Variability from heartbeat intervals and of the Respiratory Sinus Arrhythmia from both the heartbeat intervals and the respiratory signal.
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Scarpetta et al. (2022) studied this question. Smartphone accelerometer-based measurement vs. Electrocardiograph and spirometer was evaluated on Accuracy of heartbeat and respiratory intervals estimation. A smartphone accelerometer placed on the xiphoid process accurately measured heartbeat and respiratory intervals simultaneously compared to electrocardiograph and spirometer measurements.
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