![periodic motion pulse periodic motion pulse](https://img.yumpu.com/30536111/1/500x640/unit-vii-waves-bremen-high-school-district-228-overview.jpg)
Methods: The algorithm was retrospectively evaluated on forehead PPG signals measured while walking on a treadmill. Our objective was to develop a generic algorithm to remove periodic motion artifacts, recovering artifact-reduced PPG signals for beat-to-beat analysis. This hampers measurement of interbeat intervals (IBIs) and oxygen saturation (SpO2 ). The proposed algorithm can be of significance for monitoring in ADL, CPX, or CPR, by providing artifact-reduced PPG signals for improved IBI and SpO 2 measurements during periodic motion.Ībstract = "Periodic motion artifacts affect photoplethysmography (PPG) signals in activities of daily living (ADL), cardiopulmonary exercise testing (CPX), and cardiopulmonary resuscitation (CPR). Conclusion: Accelerometry provided a more reliable motion reference signal. Artifact reduction was effective for distinct step rate and pulse rate, since the artifact-reduced signals provided more stable IBI and SpO 2 measurements. Results: Compared to Δx, av had a better signal-to-noise ratio and more consistently contained a component at the step rate. Subtracting the estimate from the measured signal reduced the artifacts. Quadrature components need only two coefficients per frequency leading to a short filter and prevent undesired frequency-shifted components in the artifact estimate. The step rate was used in a quadrature harmonic model to estimate the artifacts.
Periodic motion pulse skin#
Two reference signals were compared: sensor motion relative to the skin (Δx) measured via self-mixing interferometry and head motion (av ) measured via accelerometry.
![periodic motion pulse periodic motion pulse](https://images.slideplayer.com/25/7945366/slides/slide_8.jpg)
The step rate was tracked in a motion reference signal via a second-order generalized integrator with a frequency-locked loop. Periodic motion artifacts affect photoplethysmography (PPG) signals in activities of daily living (ADL), cardiopulmonary exercise testing (CPX), and cardiopulmonary resuscitation (CPR).