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https://www.readbyqxmd.com/read/28919217/population-based-beat-to-beat-qt-analysis-from-holter-recordings-in-the-long-qt-syndrome
#1
Alex Page, Scott McNitt, Xiaojuan Xia, Wojciech Zareba, Jean-Philippe Couderc
The increasing dissemination of wearable ECG recorders (e.g. Holter, patches, and strap sensors) enables the acquisition of large amounts of data during long periods of time. However, the clinical value of these long-term continuous recordings is hindered by the lack of automatic tools to extract clinically relevant information (other than non-sinus and life-threatening rhythms) from such long-term data, particularly when targeting population-based research. In this work, we propose and test a new tool for analyzing beat-to-beat interval measurements and extracting features from Holter ECGs...
August 10, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28915915/nocturnal-heart-rate-variability-in-1-year-old-infants-analyzed-by-using-the-least-square-cosine-spectrum-method
#2
Yuko Kochiya, Akari Hirabayashi, Yuhei Ichimaru
BACKGROUND: To evaluate the dynamic nature of nocturnal heart rate variability, RR intervals recorded with a wearable heart rate sensor were analyzed using the Least Square Cosine Spectrum Method. METHODS: Six 1-year-old infants participated in the study. A wearable heart rate sensor was placed on their chest to measure RR intervals and 3-axis acceleration. Heartbeat time series were analyzed for every 30 s using the Least Square Cosine Spectrum Method, and an original parameter to quantify the regularity of respiratory-related heart rate rhythm was extracted and referred to as "RA (RA-COSPEC: Respiratory Area obtained by COSPEC)...
September 16, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28906431/an-optical-fiber-based-airborne-particle-sensor
#3
Yifan Wang, John F Muth
A new optical-fiber-based airborne particle counter is reported. Unlike traditional light-scatter-based techniques, the particle is detected through the drop in optical fiber coupling efficiency as the particle disrupts the electromagnetic mode of the optical beam. The system is simple, substantially smaller than traditional systems, and does not require high power laser input. This makes it attractive for wearable air quality monitors where size is a premium. There is close agreement between theoretical model and experimental results for solid and liquid particles in the 1 to 10 µm range...
September 14, 2017: Sensors
https://www.readbyqxmd.com/read/28901746/a-lab-on-skin-a-review-of-flexible-and-stretchable-electronics-for-wearable-health-monitoring
#4
Yuhao Liu, Matt Pharr, Giovanni Antonio Salvatore
Skin is the largest organ of the human body, and it offers a diagnostic interface rich with vital biological signals from the inner organs, blood vessels, muscles, and dermis/epidermis. Soft, flexible, and stretchable electronic devices provide a novel platform to interface with soft tissues for robotic feedback and control, regenerative medicine, and continuous health monitoring. Here, we introduce the term "lab-on-skin" to describe a set of electronic devices that have physical properties, such as thickness, thermal mass, elastic modulus, and water-vapor permeability, which resemble those of the skin...
September 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901736/facile-fabrication-of-flexible-linbo3-piezoelectric-sensor-through-hot-pressing-for-biomechanical-monitoring
#5
Muzhen Xu, Hua Kang, Li Guan, Huayi Li, Meining Zhang
Wearable pressure sensors due to their portability and flexibility, have been attracting increasing attention for biomechanical monitoring. However, although great advances have been made by many efforts, the sensors with good performance produced by facile methods are insufficient. Here, we present a simple method for simple manufacturing one flexible and self-powered piezoelectric sensor based on LiNbO3 (LN) particles. The LN particles are dispersed in polypropylene (PP) doped with multi-walled carbon nanotubes (MWCNTs) through hot-pressing (200°C), forming LN/MWCNTs/PP piezoelectric composite film (PCF) flexible sensor...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28899433/wearable-sensors-to-predict-improvement-following-an-exercise-intervention-in-patients-with-knee-osteoarthritis
#6
Dylan Kobsar, Sean T Osis, Jeffrey E Boyd, Blayne A Hettinga, Reed Ferber
BACKGROUND: Muscle strengthening exercises consistently demonstrate improvements in the pain and function of adults with knee osteoarthritis, but individual response rates can vary greatly. Identifying individuals who are more likely to respond is important in developing more efficient rehabilitation programs for knee osteoarthritis. Therefore, the purpose of this study was to determine if pre-intervention multi-sensor accelerometer data (e.g., back, thigh, shank, foot accelerometers) and patient reported outcome measures (e...
September 12, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28895272/stretchable-electronic-sensors-of-nanocomposite-network-films-for-ultrasensitive-chemical-vapor-sensing
#7
Hong Yan, Mengjuan Zhong, Ze Lv, Pengbo Wan
A stretchable, transparent, and body-attachable chemical sensor is assembled from the stretchable nanocomposite network film for ultrasensitive chemical vapor sensing. The stretchable nanocomposite network film is fabricated by in situ preparation of polyaniline/MoS2 (PANI/MoS2 ) nanocomposite in MoS2 suspension and simultaneously nanocomposite deposition onto prestrain elastomeric polydimethylsiloxane substrate. The assembled stretchable electronic sensor demonstrates ultrasensitive sensing performance as low as 50 ppb, robust sensing stability, and reliable stretchability for high-performance chemical vapor sensing...
September 12, 2017: Small
https://www.readbyqxmd.com/read/28894919/-timed-up-and-go-and-brain-atrophy-a-preliminary-mri-study-to-assess-functional-mobility-performance-in-multiple-sclerosis
#8
Lorena Lorefice, G Coghe, G Fenu, M Porta, G Pilloni, J Frau, F Corona, V Sechi, M A Barracciu, M G Marrosu, M Pau, E Cocco
Motor and cognitive disabilities are related to brain atrophy in multiple sclerosis (MS). 'Timed up and go' (TUG) has been recently tested in MS as functional mobility test, as it is able to evaluate ambulation/coordination-related tasks, as well as cognitive function related to mobility. The objective of this study is to evaluate the relationship between brain volumes and TUG performances. Inclusion criteria were a diagnosis of MS and the ability to walk at least 20 m. TUG was performed using a wearable inertial sensor...
September 11, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28891805/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#9
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Peter Boon, Woo Lee, Frank T Fisher, Eui-Hyeok Yang
Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) and graphene have been considered for flexible electrode applications, due to their mechanical strength, high carrier mobility, and excellent thermal conductivity. Vertically aligned carbon nanotubes (VACNTs) provide the possibility to serve as interconnects to graphene sheets as stretchable electrodes that could maintain high electrical conductivity under large tensile strain...
September 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28891284/a-highly-stretchable-nanofiber-based-electronic-skin-with-pressure-strain-and-flexion-sensitive-properties-for-health-and-motion-monitoring
#10
Kun Qi, Jianxin He, Hongbo Wang, Yuman Zhou, Xiaolu You, Nan Nan, Weili Shao, Lidan Wang, Bin Ding, Shizhong Cui
The development of flexible and stretchable electronic skins that can mimic the complex characteristics of natural skin is of great value for applications in human motion detection, healthcare, speech recognition, and robotics. In this work, we propose an efficient and low-cost fabrication strategy to construct a highly sensitive and stretchable electronic skin that enables the detection of dynamic and static pressure, strain, and flexion based on an elastic graphene oxide(GO) doped polyurethane (PU) nanofiber membrane with an ultrathin conductive poly(3,4-ethylenedioxythiophene) (PEDOT) coating layer...
September 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28888556/telehealth-in-older-adults-with-cancer-in-the-united-states-the-emerging-use-of-wearable-sensors
#11
REVIEW
John Shen, Arash Naeim
As the aging and cancer populations in the world continue to increase, the need for complements to traditional geriatric assessments and the logical incorporation of fast and reliable telehealth tools have become interlinked. In the United States, studies examining the use of telehealth for chronic disease management have shown promising results in small groups. The implementation of health technology on a broader scale requires older adults to both accept and adapt such innovation into routine medical care...
September 6, 2017: Journal of Geriatric Oncology
https://www.readbyqxmd.com/read/28885546/an-energy-efficient-technique-using-electric-active-shielding-for-capacitive-coupling-intra-body-communication
#12
Chao Ma, Zhonghua Huang, Zhiqi Wang, Linxuan Zhou, Yinlin Li
Capacitive coupling intra-body communication (CC-IBC) has become one of the candidates for healthcare sensor networks due to its positive prevailing features of energy efficiency, transmission rate and security. Under the CC-IBC scheme, some of the electric field emitted from signal (SIG) electrode of the transmitter will couple directly to the ground (GND) electrode, acting equivalently as an internal impedance of the signal source and inducing considerable energy losses. However, none of the previous works have fully studied the problem...
September 8, 2017: Sensors
https://www.readbyqxmd.com/read/28885155/a-nonlinear-dynamics-based-estimator-for-functional-electrical-stimulation-preliminary-results-from-lower-leg-extension-experiments
#13
Marcus Allen, Qiang Zhong, Nicholas Kirsch, Ashwin Dani, William W Clark, Nitin Sharma
Miniature inertial measurement units (IMUs) are wearable sensors that measure limb segment or joint angles during dynamic movements. However, IMUs are generally prone to drift, external magnetic interference, and measurement noise. This paper presents a new class of nonlinear state estimation technique called state-dependent coefficient (SDC) estimation to accurately predict joint angles from IMU measurements. The SDC estimation method uses limb dynamics, instead of limb kinematics, to estimate the limb state...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28879179/capturing-the-cranio-caudal-signature-of-a-turn-with-inertial-measurement-systems-methods-parameters-robustness-and-reliability
#14
Karina Lebel, Hung Nguyen, Christian Duval, Réjean Plamondon, Patrick Boissy
BACKGROUND: Turning is a challenging mobility task requiring coordination and postural stability. Optimal turning involves a cranio-caudal sequence (i.e., the head initiates the motion, followed by the trunk and the pelvis), which has been shown to be altered in patients with neurodegenerative diseases, such as Parkinson's disease as well as in fallers and frails. Previous studies have suggested that the cranio-caudal sequence exhibits a specific signature corresponding to the adopted turn strategy...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28876901/flexible-graphene-based-wearable-gas-and-chemical-sensors
#15
Eric Singh, M Meyyappan, Hari S Nalwa
Wearable electronics is expected to be one of the most active research areas in the next decade, therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, light-weight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons...
September 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28873838/overview-of-robotic-devices-for-nursing-care-project
#16
Hirohisa Hirukawa
METI/AMED are conducting a project on the development and deployment of robotic devices for nursing care to enhance the autonomy of elderly persons and assist care givers. An evaluation protocol is presented and the devices developed in the project are introduced. The devices consist of transfer assist devices (wearable/non-wearable), walking assist devices (outdoor/indoor), safety surveillance sensors (nursing home/private home), bath lift and toilet assist.
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28872765/digital-therapy-in-diabetes
#17
REVIEW
Avivit Cahn, Amit Akirov, Itamar Raz
Diabetes care is largely dependent on patient self-management and empowerment, given that patients with diabetes must make numerous daily decisions of what to eat, when to exercise, and determine their insulin dose and timing if required. Additionally, patients and providers are generating vast amounts of data from many sources including electronic medical records, insulin pumps, sensors, glucometers, other wearables, as well as evolving genomic, proteomic, metabolomic and microbiomic data. Multiple digital tools and apps have been developed to assist patients to choose wisely, as well as enhance their compliance by employing motivational tools and incorporating incentives from social media and gaming techniques...
September 5, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/28872727/hollow-structured-graphene-silicone-composite-based-piezoresistive-sensors-decoupled-property-tuning-and-bending-reliability
#18
Ningqi Luo, Yan Huang, Jing Liu, Shih-Chi Chen, Ching Ping Wong, Ni Zhao
A versatile flexible piezoresistive sensor should maintain high sensitivity in a wide linear range, and provide a stable and repeatable pressure reading under bending. These properties are often difficult to achieve simultaneously with conventional filler-matrix composite active materials, as tuning of one material component often results in change of multiple sensor properties. Here, a material strategy is developed to realize a 3D graphene-poly(dimethylsiloxane) hollow structure, where the electrical conductivity and mechanical elasticity of the composite can be tuned separately by varying the graphene layer number and the poly(dimethylsiloxane) composition ratio, respectively...
September 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28866347/wearable-inertial-sensors-allow-for-quantitative-assessment-of-shoulder-and-elbow-kinematics-in-a-cadaveric-knee-arthroscopy-model
#19
Michael Rose, Carolin Curtze, Joseph O'Sullivan, Mahmoud El-Gohary, Dennis Crawford, Darin Friess, Jacqueline M Brady
PURPOSE: To develop a model using wearable inertial sensors to assess the performance of orthopaedic residents while performing a diagnostic knee arthroscopy. METHODS: Fourteen subjects performed a diagnostic arthroscopy on a cadaveric right knee. Participants were divided into novices (5 postgraduate year 3 residents), intermediates (5 postgraduate year 4 residents), and experts (4 faculty) based on experience. Arm movement data were collected by inertial measurement units (Opal sensors) by securing 2 sensors to each upper extremity (dorsal forearm and lateral arm) and 2 sensors to the trunk (sternum and lumbar spine)...
August 30, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28863247/self-powered-pulse-sensor-for-antidiastole-of-cardiovascular-disease
#20
Han Ouyang, Jingjing Tian, Guanglong Sun, Yang Zou, Zhuo Liu, Hu Li, Luming Zhao, Bojing Shi, Yubo Fan, Yifan Fan, Zhong Lin Wang, Zhou Li
Cardiovascular diseases are the leading cause of death globally; fortunately, 90% of cardiovascular diseases are preventable by long-term monitoring of physiological signals. Stable, ultralow power consumption, and high-sensitivity sensors are significant for miniaturized wearable physiological signal monitoring systems. Here, this study proposes a flexible self-powered ultrasensitive pulse sensor (SUPS) based on triboelectric active sensor with excellent output performance (1.52 V), high peak signal-noise ratio (45 dB), long-term performance (10(7) cycles), and low cost price...
September 1, 2017: Advanced Materials
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