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https://www.readbyqxmd.com/read/28731981/technology-in-strength-and-conditioning-assessing-bodyweight-squat-technique-with-wearable-sensors
#1
Martin A OʼReilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
O'Reilly, MA, Whelan, DF, Ward, TE, Delahunt, E, and Caulfield, BM. Technology in strength and conditioning: assessing bodyweight squat technique with wearable sensors. J Strength Cond Res 31(8): 2303-2312, 2017-Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However, it is not always practical to operate under the direct supervision of an S&C coach and consequently individuals are often left training without expert oversight. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualized feedback regarding exercise performance...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28731322/large-scale-stretchable-semi-embedded-copper-nanowires-transparent-conductive-films-by-electrospinning-template
#2
Xia Yang, Xiaotian Hu, Qingxia Wang, Jian Xiong, Hanjun Yang, Xiangchuan Meng, Licheng Tan, Lie Chen, Yiwang Chen
With recent emergence of wearable electronic devices, the flexible and stretchable transparent electrodes are the core components to realize innovative devices. Copper nanowires (CuNWs) network is commonly chosen because of its high conductivity and transparency. However, the junction resistances and low aspect ratios still limit its further stretchable performance. Herein, a large-scale stretchable semi-embedded CuNWs transparent conductive film (TCFs) was fabricated by electrolessly depositing Cu on the electrospun poly (4-vinylpyridine) (P4VP) polymer template semi-embedded in polydimethylsiloxane (PDMS)...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731088/laser-engraved-carbon-nanotube-paper-for-instilling-high-sensitivity-high-stretchability-and-high-linearity-in-strain-sensors
#3
Yangyang Xin, Jian Zhou, Xuezhu Xu, Gilles Lubineau
There is an increasing demand for strain sensors with high sensitivity and high stretchability for new applications such as robotics or wearable electronics. However, for the available technologies, the sensitivity of the sensors varies widely. These sensors are also highly nonlinear, making reliable measurement challenging. Here we introduce a new family of sensors composed of a laser-engraved carbon nanotube paper embedded in an elastomer. A roll-to-roll pressing of these sensors activates a pre-defined fragmentation process, which results in a well-controlled, fragmented microstructure...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730810/static-and-dynamic-water-motion-induced-instability-in-oxide-thin-film-transistors-and-its-suppression-by-using-low-k-fluoropolymer-passivation
#4
Seungbeom Choi, Jeong-Wan Jo, Jaeyoung Kim, Seungho Song, Jaekyun Kim, Sung Kyu Park, Yong-Hoon Kim
Here, we report static and dynamic water motion-induced instability in indium-gallium-zinc-oxide (IGZO) thin-film transistors (TFTs) and its effective suppression with the use of a simple, solution-processed low-k (ε ~ 1.9) fluoroplastic resin (FPR) passivation layer. The liquid-contact electrification effect, in which an undesirable drain current modulation is induced by a dynamic motion of charged liquid such as water, can cause a significant instability in IGZO TFTs. It was found that by adopting a thin (~44 nm) FPR passivation layer for IGZO TFTs, the current modulation induced by the water-contact electrification was greatly reduced in both off- and on-states of the device...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730804/wearable-and-transparent-capacitive-strain-sensor-with-high-sensitivity-based-on-patterned-ag-nanowire-networks
#5
Seung-Rok Kim, Jin-Hoon Kim, Jin-Woo Park
In this study, a transparent and stretchable thin-film capacitive strain sensor based on patterned Ag nanowire networks (AgNWs) was successfully fabricated. The AgNWs were patterned using a capillary force lithography (CFL) method and were embedded onto the surface of the polydimethylsiloxane (PDMS) substrate. The strain (ε) sensitivity of the capacitive strain sensor was controlled and enhanced by patterning the AgNWs into electrodes with an interdigitated shape. Interdigitated capacitive strain sensor (ICSS) is expected to have -1...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729661/surface-modification-of-anisotropic-dielectric-elastomer-actuators-with-uni-and-bi-axially-wrinkled-carbon-electrodes-for-wettability-control
#6
Kiwoo Jun, Donggyu Kim, Seunghwa Ryu, Il-Kwon Oh
Interest in soft actuators for next-generation electronic devices, such as wearable electronics, haptic feedback systems, rollable flexible displays, and soft robotics, is rapidly growing. However, for more practical applications in diverse electronic devices, soft actuators require multiple functionalities including anisotropic actuation in three-dimensional space, active tactile feedback, and controllable wettability. Herein, we report anisotropic dielectric elastomer actuators with uni- and bi-axially wrinkled carbon black electrodes that are formed through pre-streching and relaxation processes...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729003/the-effects-of-an-activity-promotion-system-on-active-living-in-overweight-subjects-with-metabolic-abnormalities
#7
Ya-Ping Yang, Chi-Jane Wang, Jing-Jy Wang, Che-Wei Lin, Ya-Ting Carolyn Yang, Jeen-Shing Wang, Yen Kuang Yang, Yi-Ching Yang
OBJECTIVES: The aim of this study is to examine the effects of Activity Promotion System (APs) on promoting physical activity (PA) for overweight subjects with metabolic abnormalities. METHODS: We designed a six-month randomised controlled trial with a cross-over design, and recruited 53 subjects. Subjects in group A used APs with a wearable device measuring whole-day PA, including sleep time, sedentary, light, moderate and vigorous PA and a web-based feedback system in the first three months and followed by usual care with traditional health education in the next three months...
July 17, 2017: Obesity Research & Clinical Practice
https://www.readbyqxmd.com/read/28728580/lumbar-microdiscectomy-and-post-operative-activity-restrictions-a-protocol-for-a-single-blinded-randomised-controlled-trial
#8
Chris D Daly, Kai Zheong Lim, Jennifer Lewis, Kelly Saber, Mohammed Molla, Naor Bar-Zeev, Tony Goldschlager
BACKGROUND: Lumbar microdiscectomy is the most commonly performed spinal surgery procedure, with over 300,000 cases performed annually in the United States alone. Traditionally, patients were advised to restrict post-operative activity as this was believed to reduce the risk of disc reherniation and progressive instability. However, this practice would often delay patients return to work. In contemporary practice many surgeons do not restrict patient post-operative activity due to the perception this practice is unnecessary...
July 20, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28727414/graphene-based-three-dimensional-capacitive-touch-sensor-for-wearable-electronics
#9
Minpyo Kang, Jejung Kim, Bongkyun Jang, Youngcheol Chae, Jae-Hyun Kim, Jong-Hyun Ahn
The development of input device technology in a conformal and stretchable format is important for the advancement of various wearable electronics. Herein, we report a capacitive touch sensor with good sensing capabilities in both contact and non-contact modes, enabled by the use of graphene and a thin device geometry. This device can be integrated with highly deformable areas of the human body, such as the forearms and palms. This touch sensor detects multiple touch signals in acute recordings and recognizes the distance and shape of the approaching objects before direct contact is made...
July 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28726969/a-fiber-asymmetric-supercapacitor-based-on-feooh-ppy-on-carbon-fibers-as-an-anode-electrode-with-high-volumetric-energy-density-for-wearable-applications
#10
Xuefei Gong, Shaohui Li, Pooi See Lee
Fiber supercapacitors are promising energy storage devices for wearable applications. However, the fiber supercapacitors are currently limited by the mediocre capacitance performances due to the use of typical carbon materials as the anode, sacrificing the volumetric energy density of the whole device. In addition, the inability to undergo washable cycles and poor self-discharge rate prevents the fiber-shaped supercapacitors from being a true energy textile and affects their practicability. Hence, the porous anode electrode FeOOH/PPy@CF has been firstly prepared with a high volumetric capacitance of 30...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28725530/smart-fluid-systems-the-advent-of-autonomous-liquid-robotics
#11
REVIEW
A Chiolerio, Marco B Quadrelli
Organic, inorganic or hybrid devices in the liquid state, kept in a fixed volume by surface tension or by a confining membrane that protects them from a harsh environment, could be used as biologically inspired autonomous robotic systems with unique capabilities. They could change shape according to a specific exogenous command or by means of a fully integrated adaptive system, and provide an innovative solution for many future applications, such as space exploration in extreme or otherwise challenging environments, post-disaster search and rescue in ground applications, compliant wearable devices, and even in the medical field for in vivo applications...
July 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28723207/wearable-flexible-and-multifunctional-healthcare-device-with-an-isfet-chemical-sensor-for-simultaneous-sweat-ph-and-skin-temperature-monitoring
#12
Shogo Nakata, Takayuki Arie, Seiji Akita, Kuniharu Takei
Real-time daily healthcare monitoring may increase the chances of predicting and diagnosing diseases in their early stages which, currently, occurs most frequently during medical check-ups. Next-generation noninvasive healthcare devices, such as flexible multifunctional sensor sheets designed to be worn on skin, are considered to be highly suitable candidates for continuous real-time health monitoring. For healthcare applications, acquiring data on the chemical state of the body, alongside physical characteristics such as body temperature and activity, are extremely important for predicting and identifying potential health conditions...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723192/mechanistic-challenges-and-advantages-of-biosensor-miniaturization-into-the-nanoscale
#13
Leyla Soleymani, Feng Li
Over the past few decades, there has been tremendous interest in developing biosensing systems that combine high sensitivity and specificity with rapid sample-to-answer times, portability, low-cost operation, and ease-of-use. Miniaturizing the biosensor dimensions into the nanoscale has been identified as a strategy for addressing the functional requirements of point-of-care and wearable biosensors. However, it is important to consider that decreasing the critical dimensions of biosensing elements impacts the two most important performance metrics of biosensors: limit-of-detection and response time...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723187/wearable-flexible-and-stretchable-glove-biosensor-for-on-site-detection-of-organophosphorus-chemical-threats
#14
Rupesh K Mishra, Lee J Hubble, Aida Martín, Rajan Kumar, Abbas Barfidokht, Jayoung Kim, Mustafa M Musameh, Ilias L Kyratzis, Joseph Wang
A flexible glove-based electrochemical biosensor with highly stretchable printed electrode system has been developed as a wearable point-of-use screening tool for defense and food security applications. This disposable-mechanically robust "lab-on-a-glove" integrates a stretchable printable enzyme-based biosensing system and active surface for swipe sampling on different fingers, and is coupled with a compact electronic interface for electrochemical detection and real-time wireless data transmission to a smartphone device...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28721726/3d-printed-earable-smart-devices-for-real-time-detection-of-core-body-temperature
#15
Hiroki Ota, Minghan Chao, Yuji Gao, Eric Wu, Li-Chia Tai, Kevin Chen, Yasutomo Matsuoka, Kosuke Iwai, Hossain M Fahad, Wei Gao, Hnin Yin Yin Nyein, Liwei Lin, Ali Javey
Real-time detection of basic physiological parameters such as blood pressure and heart rate is an important target in wearable smart devices for healthcare. Among these, the core body temperature is one of the most important basic medical indicators of fever, insomnia, fatigue, metabolic functionality, and depression. However, traditional wearable temperature sensors are based upon the measurement of skin temperature, which can vary dramatically from the true core body temperature. Here, we demonstrate a three-dimensional (3D) printed wearable "earable" smart device that is designed to be worn on the ear to track core body temperature from the tympanic membrane (i...
July 19, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28720438/on-the-utility-of-3d-hand-cursors-to-explore-medical-volume-datasets-with-a-touchless-interface
#16
Daniel Simões Lopes, Pedro Duarte de Figueiredo Parreira, Soraia Figueiredo Paulo, Vitor Nunes, Paulo Amaral Rego, Manuel Cassiano Neves, Pedro Silva Rodrigues, Joaquim Armando Jorge
Analyzing medical volume datasets requires interactive visualization so that users can extract anatomo-physiological information in real-time. Conventional volume rendering systems rely on 2D input devices, such as mice and keyboards, which are known to hamper 3D analysis as users often struggle to obtain the desired orientation that is only achieved after several attempts. In this paper, we address which 3D analysis tools are better performed with 3D hand cursors operating on a touchless interface comparatively to a 2D input devices running on a conventional WIMP interface...
July 15, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28719739/graphene-electronic-tattoo-sensors
#17
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics owing to their thinness and softness. While most of them are based on thin metal films, silicon membrane, or nanoparticle-based printable inks, we report a sub-micron thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed with filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ~85%, and a stretchability of more than 40%...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719614/beat-id-towards-a-computationally-low-cost-single-heartbeat-biometric-identity-check-system-based-on-electrocardiogram-wave-morphology
#18
Joana S Paiva, Duarte Dias, João P S Cunha
In recent years, safer and more reliable biometric methods have been developed. Apart from the need for enhanced security, the media and entertainment sectors have also been applying biometrics in the emerging market of user-adaptable objects/systems to make these systems more user-friendly. However, the complexity of some state-of-the-art biometric systems (e.g., iris recognition) or their high false rejection rate (e.g., fingerprint recognition) is neither compatible with the simple hardware architecture required by reduced-size devices nor the new trend of implementing smart objects within the dynamic market of the Internet of Things (IoT)...
2017: PloS One
https://www.readbyqxmd.com/read/28715632/all-graphene-oxide-flexible-solid-state-supercapacitors-with-enhanced-electrochemical-performance
#19
Chikako Ogata, Ruriko Kurogi, Keisuke Awaya, Kazuto Hatakeyama, Takaaki Taniguchi, Michio Koinuma, Yasumichi Matsumoto
The rapid development of flexible and wearable electronics has led to an increase in the demand for flexible supercapacitors with enhanced electrochemical performance. Graphene oxide (GO) and reduced GO (rGO) exhibit several key properties required for supercapacitor components. Although solid-state rGO/GO/rGO supercapacitors with unique structures are promising, their moderate capacitance is inadequate for practical applications. Herein, we report a flexible solid-state rGO/GO/rGO supercapacitor comprising H2SO4-intercalated GO electrolyte/separator and pseudo-capacitive rGO electrodes, which demonstrate excellent electrochemical performance...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28715331/the-importance-of-haptics-in-generating-exoskeleton-gait-trajectory-using-alternate-motor-inputs
#20
Kiran K Karunakaran, Kevin M Abbruzzese, Hao Xu, Richard A Foulds
Human gait requires both haptic and visual feedback to generate and control rhythmic movements, and navigate environmental obstacles. Current lower extremity wearable exoskeletons that restore gait to individuals with paraplegia due to spinal cord injury rely completely on visual feedback to generate limited pre-programmed gait-variations, and generally provide little control by the user over the gait cycle. As an alternative to this limitation, we propose user control of gait in real time using healthy upper extremities...
July 13, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
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