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HRV measurement using photoplethysmography (PPG) sensors, such as those embedded in smartwatches, has been tested against and found to correspond with gold-standard electrocardiogram (ECG) measurements [5]. Although PPG- and ECG-derived HRV metrics have generally good agreement, PPG-based measures can differ from ECG-based measures in the presence of physical activity, cold exposure, and other factors [6-8].
JMIR Form Res 2024;8:e53977
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The Use of Photoplethysmography in the Assessment of Mental Health: Scoping Review
Most studies used finger-based PPG methods to evaluate mental health outcomes and psychological stress [31-33,38,39,43,46,49,51]. Some researchers have used this arm for PPG measurement [10]. A few have used smartphone-based technology, which includes a PPG finger sensor and video camera [35,44] or face-based webcam technology [54]. This implies that mobile methods, including smartphones, for PPG are scarce and are emerging as novel methods for assessing mental health.
JMIR Ment Health 2023;10:e40163
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The wearable PPG wristband device, ELAN, was equipped with a Philips Cardio and Motion Monitoring Module (CM3, Philips Electronic Nederland BV), which contains a PPG and 3-axial accelerometer sensor. The PPG sensor measures the intensity of the green light scatter-reflected from the skin to determine changes in blood volume in the peripheral circulation with a sampling frequency of 32 Hz [19].
JMIR Perioper Med 2023;6:e40474
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Therefore, wrist-worn measurement of HR via PPG represents a more unobtrusive and comfortable means of monitoring HR.
The potential to inform improved health care delivery is offered by wrist-worn PPG devices with screening or diagnostic, therapeutic monitoring, and self-management applications [6-9].
JMIR Form Res 2022;6(9):e34280
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We collected PPG signals for extracting HRV parameters. Nighttime PPG data were used in this study to extract the HRV trends during pregnancy and postpartum period. Daytime PPG data were discarded as participants were involved in various activities and environments during the day, making PPG signals unreliable owing to movement artifacts and environmental noises.
We analyzed the collected data on the cloud server. Data analysis included several steps, as shown in Figure 1.
JMIR Mhealth Uhealth 2022;10(6):e33458
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In-Home Cardiovascular Monitoring System for Heart Failure: Comparative Study
The seat incorporates a single-lead ECG for measuring the electrical activity of the heart and as a reference for ensemble averaging [24], a ballistocardiogram (BCG) for measuring the mechanical forces associated with the cardiac cycle, and a photoplethysmogram (PPG) for measuring Sp O2 and pulse transit time (PTT) (Figure 2).
JMIR Mhealth Uhealth 2019;7(1):e12419
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