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https://www.readbyqxmd.com/read/28538708/accuracy-in-wrist-worn-sensor-based-measurements-of-heart-rate-and-energy-expenditure-in-a-diverse-cohort
#1
Anna Shcherbina, C Mikael Mattsson, Daryl Waggott, Heidi Salisbury, Jeffrey W Christle, Trevor Hastie, Matthew T Wheeler, Euan A Ashley
The ability to measure physical activity through wrist-worn devices provides an opportunity for cardiovascular medicine. However, the accuracy of commercial devices is largely unknown. The aim of this work is to assess the accuracy of seven commercially available wrist-worn devices in estimating heart rate (HR) and energy expenditure (EE) and to propose a wearable sensor evaluation framework. We evaluated the Apple Watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn, and Samsung Gear S2. Participants wore devices while being simultaneously assessed with continuous telemetry and indirect calorimetry while sitting, walking, running, and cycling...
May 24, 2017: Journal of Personalized Medicine
https://www.readbyqxmd.com/read/28538335/bigaussian-wavefront-model-for-normal-and-keratoconic-eyes
#2
Jos J Rozema, Pablo Rodríguez, Rafael Navarro, Carina Koppen
PURPOSE: To report bigaussian multivariate wavefront models capable of stochastically generating an unlimited amount of plausible wavefront data for either normal or keratoconic eyes. METHODS: The models use centroid wavefront data measured previously with an iTrace in 330 healthy right eyes and 122 keratoconic right eyes. These centroids were fitted to an 11th-order Zernike series, followed by principal component analysis to reduce dimensionality and remove correlations...
June 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28535308/invited-commentary-the-contribution-to-the-field-of-nutritional-epidemiology-of-the-landmark-1985-publication-by-willett-et-al
#3
Amy F Subar, Lawrence H Kushi, Jennifer L Lerman, Laurence S Freedman
The semiquantitative food frequency questionnaire (FFQ) has been the primary source of dietary exposure data in epidemiology for decades. Although frequency instruments had been evaluated before the 1985 publication "Reproducibility and Validity of a Semiquantitative Food Frequency Questionnaire" by Willett et al. (Am J Epidemiol. 1985;122(1):51-65), that paper was the prototype for the development and validation of what was then a highly innovative method for collecting dietary data. This approach was adopted in nearly all subsequent cohort studies of diet and disease...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28534831/rapidly-simultaneous-determination-of-six-effective-components-in-cistanche-tubulosa-by-near-infrared-spectroscopy
#4
Xinhong Wang, Xiaoguang Wang, Yuhai Guo
Quantitative determination of multiple effective components in a given plant usually requires a very large amount of authentic natural products. In this study, we proposed a rapid and non-destructive method for the simultaneous determination of echinacoside, verbascoside, mannitol, sucrose, glucose and fructose in Cistanche tubulosa by near infrared spectroscopy (NIRS). Near infrared diffuse reflectance spectroscopy (DRS) and high performance liquid chromatography (HPLC) were conducted on 116 batches of C. tubulosa samples...
May 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28534414/estimating-pm2-5-concentrations-in-the-conterminous-united-states-using-the-random-forest-approach
#5
Xuefei Hu, Jessica Hartmann Belle, Xia Meng, Avani Wildani, Lance Waller, Matthew Strickland, Yang Liu
To estimate PM2.5 concentrations, many parametric regression models have been developed, while non-parametric machine learning algorithms are used less often and national-scale models are rare. In this paper, we develop a random forest model incorporating Aerosol Optical Depth (AOD) data, meteorological fields, and land use variables to estimate daily 24-hour averaged ground level PM2.5 concentrations over the conterminous United States in 2011. Random forests are an ensemble learning method that provides predictions with high accuracy and interpretability...
May 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28533971/regression-assumptions-in-clinical-psychology-research-practice-a-systematic-review-of-common-misconceptions
#6
Anja F Ernst, Casper J Albers
Misconceptions about the assumptions behind the standard linear regression model are widespread and dangerous. These lead to using linear regression when inappropriate, and to employing alternative procedures with less statistical power when unnecessary. Our systematic literature review investigated employment and reporting of assumption checks in twelve clinical psychology journals. Findings indicate that normality of the variables themselves, rather than of the errors, was wrongfully held for a necessary assumption in 4% of papers that use regression...
2017: PeerJ
https://www.readbyqxmd.com/read/28533013/errors-associated-with-digital-preview-of-computer-engineered-complete-dentures-and-guidelines-for-reducing-them-a-technique-article
#7
Abdulaziz AlHelal, Brian J Goodacre, Mathew T Kattadiyil, Rajesh Swamidass
Patient reports, clinical studies, and systematic reviews reveal a rapid increase in interest in computer-engineered complete dentures (CECDs). The advantages of CECDs include a reduced number of visits, improved fit and retention, and electronic archiving. However, patient dissatisfaction has been reported with CECDs, which may be due to the lack of a trial placement appointment. This technique article identifies errors that occur when CECDs are previewed digitally and proposes guidelines and a checklist to reduce complications such as inadequate esthetics, poor tooth arrangement, misaligned occlusal plane, and inappropriate denture base characteristics...
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28532962/from-snomed-ct-to-uberon-transferability-of-evaluation-methodology-between-similarly-structured-ontologies
#8
Gai Elhanan, Christopher Ochs, Jose L V Mejino, Hao Liu, Christopher J Mungall, Yehoshua Perl
OBJECTIVE: To examine whether disjoint partial-area taxonomy, a semantically-based evaluation methodology that has been successfully tested in SNOMED CT, will perform with similar effectiveness on Uberon, an anatomical ontology that belongs to a structurally similar family of ontologies as SNOMED CT. METHOD: A disjoint partial-area taxonomy was generated for Uberon. One hundred randomly selected test concepts that overlap between partial-areas were matched to a same size control sample of non-overlapping concepts...
May 19, 2017: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/28532491/evaluation-of-an-automated-thresholding-algorithm-for-the-quantification-of-paraspinal-muscle-composition-from-mri-images
#9
Maryse Fortin, Mona Omidyeganeh, Michele Crites Battié, Omair Ahmad, Hassan Rivaz
BACKGROUND: The imaging assessment of paraspinal muscle morphology and fatty infiltration has gained considerable attention in the past decades, with reports suggesting an association between muscle degenerative changes and low back pain (LBP). To date, qualitative and quantitative approaches have been used to assess paraspinal muscle composition. Though highly reliable, manual thresholding techniques are time consuming and not always feasible in a clinical setting. The tedious and rater-dependent nature of such manual thresholding techniques provides the impetus for the development of automated or semi-automated segmentation methods...
May 22, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28531818/pharmacophore-searching-a-potential-solution-for-correcting-unknown-ligands-unk-labelling-errors-in-protein-data-bank-pdb-s
#10
Musadiq Ibrahim, Adrian Jonathan Lapthorn, Mohammad Ibrahim
The Protein Data Bank (PDB) is the single most important repository of structural data for proteins and other biologically relevant molecules. Therefore, it is critically important to keep the PDB data, error-free as much as possible. In this study, we have critically examined PDB structures of 292 protein molecules which have been deposited in the repository along with potentially incorrect ligands labelled as Unknown ligands (UNK). Pharmacophores were generated for all the protein structures by using Discovery Studio Visualizer (DSV) and Accelrys, Catalyst(®)...
April 4, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28530416/assessment-centers-versus-cognitive-ability-tests-challenging-the-conventional-wisdom-on-criterion-related-validity
#11
Paul R Sackett, Oren R Shewach, Heidi N Keiser
Separate meta-analyses of the cognitive ability and assessment center (AC) literatures report higher criterion-related validity for cognitive ability tests in predicting job performance. We instead focus on 17 samples in which both AC and ability scores are obtained for the same examinees and used to predict the same criterion. Thus, we control for differences in job type and in criteria that may have affected prior conclusions. In contrast to Schmidt and Hunter's (1998) meta-analysis, reporting mean validity of ...
May 22, 2017: Journal of Applied Psychology
https://www.readbyqxmd.com/read/28530410/correction-to-kujawa-proudfit-and-klein-2014
#12
(no author information available yet)
Reports an error in "Neural reactivity to rewards and losses in offspring of mothers and fathers with histories of depressive and anxiety disorders" by Autumn Kujawa, Greg Hajcak Proudfit and Daniel N. Klein (Journal of Abnormal Psychology, 2014[May], Vol 123[2], 287-297). In the original article, there was an error in the Measures section. The article stated that the EEG data were band-pass filtered with cutoffs of 0.1 and 30 Hz and baseline corrected using the 200 ms interval prior to feedback. Instead, the data were actually filtered with cutoffs of 0...
May 22, 2017: Journal of Abnormal Psychology
https://www.readbyqxmd.com/read/28530318/-severe-infantile-hypophosphatasia
#13
Evgenia Gurevich, Daniel Landau
Hypophosphatasia is the inborn error of metabolism that is characterized by low serum alkaline-phosphatase activity, due to loss-of-function mutations within the gene for tissuenonspecific isoenzyme of alkaline phosphatase [TNSALP]. The manifestations of hypophosphatasia range from neonatal death with almost no skeletal mineralization to dental problems in adults without any bone symptoms. There are no case reports of infantile hypophosphatasia in Israel. The existence of enzymatic replacement treatment for this disease makes it important to diagnose this problem as soon as possible...
January 2017: Harefuah
https://www.readbyqxmd.com/read/28530312/-the-second-victim-treating-the-health-care-providers
#14
REVIEW
Shimrit Shor, Orna Tal, Ron Maymon
During their professional careers, physicians and other health care providers are repeatedly exposed to emotional stress. This is usually secondary to coping with the results of a medical error or complicated medical event. Generally, in the above cases, the patient and his/her family are in the center of the medical system, being "the first victim" of such an event, while the involved caregiver, who provided the medical service, is categorized as the "second victim". "Second victims" may feel anxiety, fear, guilt or anger and experience social withdrawal, which may lead to troubling memories, depression and insomnia...
January 2017: Harefuah
https://www.readbyqxmd.com/read/28529366/wisconsin-card-sorting-test-performance-impairment-in-schizophrenia-an-indian-study-report
#15
Shailja Singh, Tapas Kumar Aich, Raju Bhattarai
AIM: The present study attempted to find out the relationship between positive and negative clinical symptoms and Wisconsin Card Sorting Test (WCST) performance in a group of schizophrenia patients. METHODOLOGY: Fifty schizophrenia patients were assessed using the Positive and Negative Syndrome Scale (PANSS) by a trained psychiatrist (TKA) and two groups, each of 25 positive symptom and 25 negative symptom schizophrenia patients were formed. On these fifty patients with schizophrenia and 15 normal control groups, WCST measures were applied by a clinical psychologist (SS) who remained blind to the PANSS score...
January 2017: Indian Journal of Psychiatry
https://www.readbyqxmd.com/read/28529250/impact-of-jaw-position-accuracy-on-dose-variation-in-volumetric-modulated-arc-therapy-using-jaw-tracking
#16
Fumiyasu Matsubayashi, Yuki Koizumi, Ryo Takahashi, Minoru Yoshioka, Tomoharu Sato
The technique of jaw tracking can be used in volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT). In this technique, jaw tracks apertures of the multi leaf collimator (MLC) during irradiation. It is reported that dose variation is occurred by the changing accuracy of MLC position in VMAT and IMRT. Though jaw moves dynamically in the irradiation by using this technique, the influence of the jaw position accuracy on dose variation is not examined. The purpose of this study is to verify the influence of jaw position accuracy on dose variation in VMAT using jaw tracking...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28529113/integrating-natural-language-processing-expertise-with-patient-safety-event-review-committees-to-improve-the-analysis-of-medication-events
#17
Allan Fong, Nicole Harriott, Donna M Walters, Hanan Foley, Richard Morrissey, Raj R Ratwani
OBJECTIVES: Many healthcare providers have implemented patient safety event reporting systems to better understand and improve patient safety. Reviewing and analyzing these reports is often time consuming and resource intensive because of both the quantity of reports and length of free-text descriptions in the reports. METHODS: Natural language processing (NLP) experts collaborated with clinical experts on a patient safety committee to assist in the identification and analysis of medication related patient safety events...
May 11, 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/28528591/conversion-ratios-of-n-3-fatty-acids-between-plasma-and-erythrocytes-a-systematic-review-and-meta-regression
#18
Xue Feng Hu, Simran K Sandhu, William S Harris, Hing Man Chan
As biomarkers of dietary intake or disease risk factor, n-3 fatty acid (FA) can be measured in plasma phospholipids (PL), total lipids (TL) or erythrocytes. However, the numeric relationships between n-3 FA in these lipid pools are not clear. Our goal was to derive conversion ratios for plasma and erythrocyte n-3 FA. Potential studies were identified through systematic literature search in PubMed, Embase and the Cochrane Library of Systematic reviews (1950 to October 2014). In all, fifty-six studies reporting n-3 in healthy individuals were included, of which thirty-four articles reported plasma PL and erythrocytes, and twenty-two reported plasma TL and erythrocytes...
May 22, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28528574/esc-track-a-computer-workflow-for-4-d-segmentation-tracking-lineage-tracing-and-dynamic-context-analysis-of-escs
#19
Laura Fernández-de-Manúel, Covadonga Díaz-Díaz, Daniel Jiménez-Carretero, Miguel Torres, María C Montoya
Embryonic stem cells (ESCs) can be established as permanent cell lines, and their potential to differentiate into adult tissues has led to widespread use for studying the mechanisms and dynamics of stem cell differentiation and exploring strategies for tissue repair. Imaging live ESCs during development is now feasible due to advances in optical imaging and engineering of genetically encoded fluorescent reporters; however, a major limitation is the low spatio-temporal resolution of long-term 3-D imaging required for generational and neighboring reconstructions...
May 1, 2017: BioTechniques
https://www.readbyqxmd.com/read/28528093/kinetic-and-thermodynamic-compensation-a-current-and-practical-review-for-foods
#20
REVIEW
Alfonso Garvín, Raquel Ibarz, Albert Ibarz
Kinetic and thermodynamic compensations have been reported in many chemical, physical, biological and food processes. Kinetic compensation can be found for any process and when it takes place, it gives information about the reaction mechanism and whether the reaction is controlled by enthalpy or entropy. It consists of the linear relationship between the logarithm of the frequency factor (lnk0) and the activation energy (Ea), both previously obtained from the Arrhenius equation for different values of an environmental variable (e...
June 2017: Food Research International
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