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Sensors, wearables

Saurabh S Thosar, Meike Niederhausen, Jodi Lapidus, Nora F Fino, Joaquin Cigarroa, Jessica Minnier, Sandra Colner, Asha Nayak, Luke J Burchill
No abstract text is available yet for this article.
December 8, 2017: British Journal of Sports Medicine
Stephen C Groft, Manuel Posada de la Paz
Members of the rare disease community have devoted significant financial and personnel resources to address the numerous issues surrounding rare diseases. The past has been devoted to developing an emphasis on rare diseases including an emphasis on research studies or locating information on rare diseases and the requirements and limitations of conducting clinical trials with small patient populations. The expanded role of patient advocacy organizations and patient engagement in all aspects of clinical research continues to gain acceptance within the research community...
2017: Advances in Experimental Medicine and Biology
Maria I Davila, Gregory F Lewis, Stephen W Porges
Heart rate variability (HRV) is a reliable indicator of health status and a sensitive index of autonomic stress reactivity. Stress negatively affects physical and psychological wellness by decreasing cardiovascular health and reducing quality of life. Wearable sensors have made it possible to track HRV during daily activity, and recent advances in mobile technology have reduced the cost and difficulty of applying this powerful technique. Although advances have made sensors smaller and lighter, some burden on the subject remains...
2017: Frontiers in Public Health
Li Li, Peipei Shi, Li Hua, Jianing An, Yujiao Gong, Ruyi Chen, Chenyang Yu, Weiwei Hua, Fei Xiu, Jinyuan Zhou, Guangfa Gao, Zhong Jin, Gengzhi Sun, Wei Huang
A wearable and shape-memory strain sensor with a coaxial configuration is designed, comprising a thermoplastic polyurethane fiber as the core support, well-aligned and interconnected carbon nanotubes (CNTs) as conductive filaments, and polypyrrole (PPy) coating as the cladding layer. In this design, the stress relaxation between CNTs is well confined by the outer PPy cladding layer, which endows the fibriform sensor with good reliability and repeatability. The microcracks generated when the coaxial fiber is under strain guarantee the superior sensitivity of this fibriform sensor with a gauge factor of 12 at 0...
December 6, 2017: Nanoscale
Sung-Joon Cho, Donghak Byun, Tai-Seung Nam, Seok-Yong Choi, Byung-Geun Lee, Myeong-Kyu Kim, Sohee Kim
Although additive manufacturing technologies, also known as 3D printing, were first introduced in the 1980s, they have recently gained remarkable popularity owing to decreased costs. 3D printing has already emerged as a viable technology in many industries; in particular, it is a good replacement for microfabrication technology. Microfabrication technology usually requires expensive clean room equipment and skilled engineers; however, 3D printing can reduce both cost and time dramatically. Although 3D printing technology has started to emerge into microfabrication manufacturing and medical applications, it is typically limited to creating mechanical structures such as hip prosthesis or dental implants...
2017: Journal of Healthcare Engineering
Jae Sang Heo, Jimi Eom, Yong-Hoon Kim, Sung Kyu Park
Wearable electronics are emerging as a platform for next-generation, human-friendly, electronic devices. A new class of devices with various functionality and amenability for the human body is essential. These new conceptual devices are likely to be a set of various functional devices such as displays, sensors, batteries, etc., which have quite different working conditions, on or in the human body. In these aspects, electronic textiles seem to be a highly suitable possibility, due to the unique characteristics of textiles such as being light weight and flexible and their inherent warmth and the property to conform...
December 4, 2017: Small
Yichen Cai, Jie Shen, Gang Ge, Yizhou Zhang, Wanqin Jin, Wei Huang, Jinjun Shao, Jian Yang, Xiaochen Dong
It remains challenging to fabricate strain-sensing materials and exquisite geometric constructions for integrating extraordinary sensitivity, low strain detectability, high stretchability, tunable sensing range, thin device dimensions into a single type of strain sensor. A percolation network based on Ti3C2Tx MXene/carbon nanotubes (CNTs) composites was rationally designed and fabricated into versatile strain sensors. This weaving architecture with excellent electric properties combined the sensitive two-dimensional (2D) Ti3C2Tx MXene nanostacks with conductive and stretchable one-dimensional (1D) CNTs crossing...
December 4, 2017: ACS Nano
Robert A Pedowitz
Wearable inertial sensors can be used for assessment of surgeon body motion during arthroscopy, with demonstrated macroergonomic differences observed between novices and experts during diagnostic arthroscopy of a right cadaver knee. Before the adoption of arthroscopy training benchmarks based on inertial sensor technology, validation research should cross-correlate ergonomic variables with surgical quality.
December 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
Sujoy Kumar Ghosh, Mengying Xie, Christopher Rhys Bowen, Philip R Davies, David J Morgan, Dipankar Mandal
In this paper, a novel infra-red (IR) sensitive Er3+ modified poly(vinylidene fluoride) (PVDF) (Er-PVDF) film is developed for converting both mechanical and thermal energies into useful electrical power. The addition of Er3+ to PVDF is shown to improve piezoelectric properties due to the formation of a self-polarized ferroelectric β-phase and the creation of an electret-like porous structure. In addition, we demonstrate that Er3+ acts to enhance heat transfer into the Er-PVDF film due to its excellent infrared absorbance, which, leads to rapid and large temperature fluctuations and improved pyroelectric energy transformation...
December 1, 2017: Scientific Reports
Anna-Maria Pappa, Onur Parlak, Gaetan Scheiblin, Pascal Mailley, Alberto Salleo, Roisin M Owens
In this review we focus on demonstrating how organic electronic materials can solve key problems in biosensing thanks to their unique material properties and implementation in innovative device configurations. We highlight specific examples where these materials solve multiple issues related to complex sensing environments, and we benchmark these examples by comparing them to state-of-the-art commercially available sensing using alternative technologies. We have categorized our examples by sample type, focusing on sensing from body fluids in vitro and on wearable sensors, which have attracted significant interest owing to their integration with everyday life activities...
November 28, 2017: Trends in Biotechnology
Shanshan Yao, Puchakayala Swetha, Yong Zhu
Highly sensitive wearable sensors that can be conformably attached to human skin or integrated with textiles to monitor the physiological parameters of human body or the surrounding environment have garnered tremendous interest. Owing to the large surface area and outstanding material properties, nanomaterials are promising building blocks for wearable sensors. Recent advances in the nanomaterial-enabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and environmental sensors are presented in this review...
November 30, 2017: Advanced Healthcare Materials
Omid Dehzangi, Mojtaba Taherisadr, Raghvendar ChangalVala
The wide spread usage of wearable sensors such as in smart watches has provided continuous access to valuable user generated data such as human motion that could be used to identify an individual based on his/her motion patterns such as, gait. Several methods have been suggested to extract various heuristic and high-level features from gait motion data to identify discriminative gait signatures and distinguish the target individual from others. However, the manual and hand crafted feature extraction is error prone and subjective...
November 27, 2017: Sensors
Jianning Wu, Jiajing Wang, Yun Ling, Haidong Xu
The jointly quantitative analysis of multi-sensor gait data for the best gait-classification performance has been a challenging endeavor in wireless body area networks (WBANs)-based gait telemonitoring applications. In this study, based on the joint sparsity of data, we proposed an advanced hybrid technique of distributed compressed sensing (DCS) and joint sparse representation classification (JSRC) for multi-sensor gait classification. Firstly, the DCS technique is utilized to simultaneously compress multi-sensor gait data for capturing spatio-temporal correlation information about gait while the energy efficiency of the sensors is available...
November 29, 2017: Sensors
Bing-Chang Zhang, Hui Wang, Le He, Cai-Jun Zheng, Jiansheng Jie, Yeshayahu Lifshitz, Shuit-Tong Lee, Xiao-Hong Zhang
The elongation of free-standing one-dimensional (1D) functional nanostructures into lengths above the millimeter range has brought new practical applications as they combine the remarkable properties of nanostructured materials with macroscopic lengths. However, it remains a big challenge to prepare 1D silicon nanostructures, one of the most important 1D nanostructures, with lengths above the millimeter range. Here we report the unprecedented preparation of ultra-long single-crystalline Si nanowires with length up to 2 cm, which can function as the smallest active material to facilitate the miniaturization of macroscopic devices...
November 29, 2017: Nano Letters
Nazmul Karim, Shaila Afroj, Sirui Tan, Pei He, Anura Fernando, Chris Carr, Kostya S Novoselov
Graphene-based wearable e-textiles are considered to be promising due to their advantages over traditional metal-based technology. However the manufacturing process is complex and currently not suitable for industrial scale application. Here we report a simple, scalable and cost-effective method of producing graphene-based wearable e-textiles through the chemical reduction GO to make stable rGO dispersions which can then be applied to the textile fabric using a simple pad-dry technique. This application method allows the potential manufacture of conductive graphene e-textiles at commercial production rates of ~150 m/min...
November 29, 2017: ACS Nano
J Heikenfeld, A Jajack, J Rogers, P Gutruf, L Tian, T Pan, R Li, M Khine, J Kim, J Wang, J Kim
Wearable sensors have recently seen a large increase in both research and commercialization. However, success in wearable sensors has been a mix of both progress and setbacks. Most of commercial progress has been in smart adaptation of existing mechanical, electrical and optical methods of measuring the body. This adaptation has involved innovations in how to miniaturize sensing technologies, how to make them conformal and flexible, and in the development of companion software that increases the value of the measured data...
November 28, 2017: Lab on a Chip
Hyoki Lee, Bellal Joseph, Ana Enriquez, Bijan Najafi
BACKGROUND: While various objective tools have been validated for assessing physical frailty in the geriatric population, these are often unsuitable for busy clinics and mobility-impaired patients. Recently, we have developed a frailty meter (FM) using two wearable sensors, which allows capturing key frailty phenotypes (weakness, slowness, and exhaustion), by testing 20-s rapid elbow flexion-extension test. OBJECTIVE: In this study, we proposed an enhanced automated algorithm to identify frailty using a single wrist-worn sensor...
November 25, 2017: Gerontology
Mohaned Shilaih, Brianna M Goodale, Lisa Falco, Florian Kübler, Valerie De Clerck, Brigitte Leeners
Core and peripheral body temperatures are affected by changes in reproductive hormones during the menstrual cycle. Women worldwide use the basal body temperature (BBT) method to aid and prevent conception. However, prior research suggests taking one's daily temperature can prove inconvenient and subject to environmental factors. We investigate whether a more automatic, non-invasive temperature measurement system can detect changes in temperature across the menstrual cycle. We examined how wrist-skin temperature (WST), measured with wearable sensors, correlates with urinary tests of ovulation and may serve as a new method of fertility tracking...
November 24, 2017: Bioscience Reports
Jeremiah W Bertz, David H Epstein, Kenzie L Preston
Whereas substance-use researchers have long combined self-report with objective measures of behavior and physiology inside the laboratory, developments in mobile/wearable electronic technology are increasingly allowing for the collection of both subjective and objective information in participants' daily lives. For self-report, ecological momentary assessment (EMA), as implemented on contemporary smartphones or personal digital assistants, can provide researchers with near-real-time information on participants' behavior and mood in their natural environments...
November 16, 2017: Addictive Behaviors
Bo Huang, Mingyu Li, Tao Mei, David McCoul, Shihao Qin, Zhanfeng Zhao, Jianwen Zhao
Motion capture of the human body potentially holds great significance for exoskeleton robots, human-computer interaction, sports analysis, rehabilitation research, and many other areas. Dielectric elastomer sensors (DESs) are excellent candidates for wearable human motion capture systems because of their intrinsic characteristics of softness, light weight, and compliance. In this paper, DESs were applied to measure all component motions of the wrist joints. Five sensors were mounted to different positions on the wrist, and each one is for one component motion...
November 23, 2017: Sensors
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