Biomedical Signal Processing and Control, Journal Year: 2025, Volume and Issue: 105, P. 107641 - 107641
Published: Feb. 8, 2025
Language: Английский
SLEEP, Journal Year: 2023, Volume and Issue: 47(4)
Published: Dec. 24, 2023
Wearable sleep-tracking technology is of growing use in the sleep and circadian fields, including for applications across other disciplines, inclusive a variety disease states. Patients increasingly present data derived from their wearable devices to providers ever-increasing availability commercial new-generation research/clinical tools has led wide adoption wearables research, which become even more relevant given discontinuation Philips Respironics Actiwatch. Standards evaluating performance have been introduced available evidence suggests that consumer-grade exceed traditional actigraphy assessing as defined by polysomnogram. However, clear limitations exist, example, misclassification wakefulness during period, problems with tracking outside main bout or nighttime artifacts, unclear translation individuals certain characteristics comorbidities. This particular relevance when person-specific factors (like skin color obesity) negatively impact sensor potential downstream augmenting already existing healthcare disparities. holds great promise our field, features distinct such measurement autonomic parameters, estimation features, integrate self-reported, objective, passively recorded health indicators. Scientists face numerous decision points barriers incorporating actigraphy, multi-sensor devices, contemporary research/clinical-grade trackers into research. Considerations include device capabilities performance, target population goals study, outputs raw aggregate data, extraction, processing, analysis. Given difficulties implementation utilization real-world research clinical settings, following State Science review requested Sleep Research Society aims address questions. What can provide? How accurate are these data? should be taken account research? These outstanding questions surrounding considerations motivated this work, outlining practical recommendations using
Language: Английский
Citations
55
Physiological Measurement, Journal Year: 2023, Volume and Issue: 44(11), P. 111001 - 111001
Published: July 26, 2023
Abstract Photoplethysmography is a key sensing technology which used in wearable devices such as smartwatches and fitness trackers. Currently, photoplethysmography sensors are to monitor physiological parameters including heart rate rhythm, track activities like sleep exercise. Yet, has potential provide much more information on health wellbeing, could inform clinical decision making. This Roadmap outlines directions for research development realise the full of photoplethysmography. Experts discuss topics within areas sensor design, signal processing, applications, directions. Their perspectives valuable guidance researchers developing technology.
Language: Английский
Citations
43
Advanced Materials, Journal Year: 2023, Volume and Issue: 35(20)
Published: Feb. 26, 2023
Abstract Most of all‐fused‐ring π‐conjugated molecules have wide or medium bandgap and show photo response in the visible range. In this work, an n‐type molecule, which exhibits ultrasmall optical 1.22 eV strong near‐infrared (NIR) absorption with onset wavelength 1013 nm is reported. The molecule consists 14 aromatic rings has electron donor–acceptor characteristics. It excellent properties low‐lying HOMO/LUMO energy levels −5.48 eV/−3.95 high mobility 7.0 × 10 −4 cm 2 V −1 s . importantly, its thin film a low trap density 5.55 16 −3 because fixed molecular conformation consequently disorder. As result, organic photodetector (OPD) based on compound remarkably dark current ( J d ) 2.01 −10 A −2 at 0 V. device shows shot‐noise‐limited specific detectivity D sh *) exceeding 13 Jones 400–1000 region peak 4.65 880 nm. This performance among best reported for self‐powered NIR OPDs.
Language: Английский
Citations
42
Journal of Biomedical Optics, Journal Year: 2024, Volume and Issue: 29(01)
Published: Jan. 24, 2024
SignificanceSkin color affects light penetration leading to differences in its absorption and scattering properties. COVID-19 highlighted the importance of understanding interaction with different skin types, e.g., pulse oximetry (PO) unreliably determined oxygen saturation levels people from Black ethnic minority backgrounds. Furthermore, increased use other medical wearables using provide disease information photodynamic therapies treat cancers, a thorough effect has on is important for reducing healthcare disparities.AimThe aim this work perform review optical properties implication variation technologies.ApproachPublished vivo coefficients associated colors were collated their effects depth transport mean free path (TMFP) assessed.ResultsVariation among reported values significant. We show that dark are ∼6% 74% greater than 400 1000 nm spectrum. Beyond 600 nm, TMFP skin. Maximum transmission all types was beyond 940 There significant losses increasing depth; spectrum, depending upon Fitzpatrick type (FST), average 14% 18% lost by 0.1 mm compared 90% 97% remaining being 1.93 mm.ConclusionsCurrent published data suggest at wavelengths greatest FSTs. Data minimal further study required. It possible amount transmitted through will converge wavelength enabling technologies become independent color.
Language: Английский
Citations
16
Diagnostics, Journal Year: 2025, Volume and Issue: 15(3), P. 327 - 327
Published: Jan. 30, 2025
Wearable devices have gained increasing attention for use in multifunctional applications related to health monitoring, particularly research of the circadian rhythms cognitive functions and metabolic processes. In this comprehensive review, we encompass how wearables can be used study disease. We highlight importance these as markers well-being potential predictors outcomes. focus on wearable technologies sleep research, medicine, chronomedicine beyond domain emphasize actigraphy a validated tool monitoring sleep, activity, light exposure. discuss various mathematical methods currently analyze actigraphic data, such parametric non-parametric approaches, linear, non-linear, neural network-based applied quantify non-circadian variability. also introduce novel actigraphy-derived markers, which personalized proxies status, assisting discriminating between disease, offering insights into neurobehavioral status. lifestyle factors physical activity exposure modulate brain health. establishing reference standards measures further refine data interpretation improve clinical The review calls existing tools methods, deepen our understanding health, develop healthcare strategies.
Language: Английский
Citations
2
AJP Heart and Circulatory Physiology, Journal Year: 2021, Volume and Issue: 322(4), P. H493 - H522
Published: Dec. 24, 2021
The photoplethysmogram (PPG) signal is widely measured by clinical and consumer devices, it emerging as a potential tool for assessing vascular age. shape timing of the PPG pulse wave are both influenced normal aging, changes in arterial stiffness blood pressure, atherosclerosis. This review summarizes research into age from PPG. Three categories approaches described:
Language: Английский
Citations
73
Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)
Published: Dec. 10, 2022
Wearable recordings of neurophysiological signals captured from the wrist offer enormous potential for seizure monitoring. Yet, data quality remains one most challenging factors that impact reliability. We suggest a combined assessment tool evaluation multimodal wearable data. analyzed patients with epilepsy four centers. Patients wore wristbands recording accelerometry, electrodermal activity, blood volume pulse, and skin temperature. calculated completeness assessed time device was worn (on-body), modality-specific signal scores. included 37,166 h 632 in inpatient 90,776 39 outpatient setting. All modalities were affected by artifacts. Data loss higher when using streaming (up to 49% among cohorts, averaged across respective recordings) as compared onboard storage 9%). On-body scores, estimating percentage on body, consistently high cohorts (more than 80%). Signal some modalities, based established indices, at night during day. A uniformly reported index is feasible, makes study results more comparable, contributes development devices routines necessary
Language: Английский
Citations
46
Physiological Measurement, Journal Year: 2022, Volume and Issue: 43(8), P. 085007 - 085007
Published: July 19, 2022
Abstract The photoplethysmogram (PPG) signal is widely used in pulse oximeters and smartwatches. A fundamental step analysing the PPG detection of heartbeats. Several beat algorithms have been proposed, although it not clear which performs best. Objective: This study aimed to: (i) develop a framework with to design test detectors; (ii) assess performance detectors different use cases; (iii) investigate how their affected by patient demographics physiology. Approach: Fifteen were assessed against electrocardiogram-derived heartbeats using data from eight datasets. Performance was F 1 score, combines sensitivity positive predictive value. Main results: Eight performed well absence movement scores ≥90% on hospital wearable collected at rest. Their poorer during exercise 55%–91%; neonates than adults 84%–96% compared 98%–99% adults; atrial fibrillation (AF) 92%–97% AF 99%–100% normal sinus rhythm. Significance: Two denoted ‘MSPTD’ ‘qppg’ best, complementary characteristics. evidence can be inform choice detector algorithm. algorithms, datasets, assessment are freely available.
Language: Английский
Citations
44
AJP Heart and Circulatory Physiology, Journal Year: 2023, Volume and Issue: 325(1), P. H1 - H29
Published: March 31, 2023
Arterial pulse waves (PWs) such as blood pressure and photoplethysmogram (PPG) signals contain a wealth of information on the cardiovascular (CV) system that can be exploited to assess vascular age identify individuals at elevated CV risk. We review possibilities, limitations, complementarity, differences reduced-order, biophysical models arterial PW propagation, well theoretical empirical methods for analyzing extracting clinically relevant assessment. provide detailed mathematical derivations these methods, showing how they are related each other. Finally, we outline directions future research realize potential modeling analysis accurate assessment in both clinic daily life.
Language: Английский
Citations
27
Hypertension, Journal Year: 2023, Volume and Issue: 80(10), P. 1980 - 1992
Published: July 20, 2023
This review critiques the literature supporting clinical assessment and management of cardiovascular disease risk stratification with brachial-ankle pulse wave velocity (baPWV). First, we outline what baPWV actually measures-arterial stiffness both large central elastic arteries medium-sized muscular peripheral lower limb. Second, argue that is not a surrogate for carotid-femoral velocity. While measures are dependent on properties aorta, also strongly extremities. Increased lower-extremity arterial amplifies hastens reflections at level widens pressure, increases afterload, reduces coronary perfusion. Third, used an established evaluation framework to identify value as independent vascular biomarker. There sufficient evidence support (1) proof concept; (2) prospective validation; (3) incremental value; (4) utility. However, there limited or no (5) outcomes; (6) cost-effectiveness; (8) methodological consensus; (9) reference values. Fourth, address future research requirements. The majority criteria, concept, validation, value, utility values, can be supported using existing cohort datasets, whereas outcomes cost-effectiveness criteria require investigation. consensus will expert statement. Finally, finish this by providing example practice model.
Language: Английский
Citations
25