keyword
MENU ▼
Read by QxMD icon Read
search

Motion analysis

keyword
https://www.readbyqxmd.com/read/27925752/emergent-structural-mechanisms-for-high-density-collective-motion-inspired-by-human-crowds
#1
Arianna Bottinelli, David T J Sumpter, Jesse L Silverberg
Collective motion of large human crowds often depends on their density. In extreme cases like heavy metal concerts and black Friday sales events, motion is dominated by physical interactions instead of conventional social norms. Here, we study an active matter model inspired by situations when large groups of people gather at a point of common interest. Our analysis takes an approach developed for jammed granular media and identifies Goldstone modes, soft spots, and stochastic resonance as structurally driven mechanisms for potentially dangerous emergent collective motion...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925638/biomechanical-analysis-of-intervertebral-cement-extravasation-in-vertebral-motion-segments
#2
Trevor C Wahlquist, John J Lee, Alexander Brunfeldt, Geoffrey T Burns, Rakesh D Patel, Gregory P Graziano
Kyphoplasty is a therapeutic option for pain relief in the setting of compression fractures. Cement extravasation into adjacent disks is a common occurrence. The biomechanical and clinical consequences of cement in the disks currently are unknown. This study investigated the biomechanical effects of cement extravasation into the intervertebral disk in a human cadaveric model. Seven thoracolumbar and lumbar embalmed human cadaveric motion segments were evaluated in axial rotation, right and left lateral bending, and flexion and extension...
December 7, 2016: Orthopedics
https://www.readbyqxmd.com/read/27925233/quantification-and-analysis-of-leaflet-flutter-on-biological-prosthetic-cardiac-valves
#3
Artur H de F Avelar, Jean A Canestri, Camila Bim, Maíra G M Silva, Rudolf Huebner, Marcos Pinotti
The use of porcine or bovine pericardium biological cardiac valves has as its main disadvantage a relatively short lifespan, with failures due to calcification and fatigue. Increasing these valves' durability constitutes a great challenge. An understudied phenomenon is the effect of flutter, an oscillation of the leaflets that can cause regurgitation and accelerate calcification and fatigue. As a starting point to study how to reduce or prevent these oscillations, a method was developed to quantify the flutter frequencies occurring at the point of the valve's full opening...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27924686/high-temperature-and-pressure-influence-the-interdomain-orientation-of-nip7-proteins-from-p-abyssi-and-p-furiosus-md-simulations
#4
Kirill E Medvedev, Nikolay A Kolchanov, Dmitry A Afonnikov
Interactions between protein domains and their position and movement relative to each other are essential for the stability and normal functioning of a protein molecule. Features of the movement of domains may define the mechanism of enzymatic reactions. Therefore, the description of this motion is an important task in the analysis of the structures and functions of multidomain proteins. In the current work, we investigated the influence of pressure and temperature on changes in the movement of the two domains of the protein Nip7, expressed by deep-water (P...
December 7, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/27924492/progression-of-gait-ataxia-in-patients-with-degenerative-cerebellar-disorders-a-4-year-follow-up-study
#5
Mariano Serrao, Giorgia Chini, Carlo Casali, Carmela Conte, Martina Rinaldi, Alberto Ranavolo, Christian Marcotulli, Luca Leonardi, Gaia Fragiotta, Fabiano Bini, Gianluca Coppola, Francesco Pierelli
In the present study, the progression of gait impairment in a group of patients with primary degenerative cerebellar ataxias was observed over a period of 4 years. A total of 30 patients underwent an initial gait analysis study, and thereafter only 12 were evaluated because they completed the 2- and 4-year follow-up evaluations. Time-distance parameters, trunk and joint range of motion (RoM), and variability parameters (e.g., coefficients of variation) were measured at the baseline and at each follow-up evaluation...
December 6, 2016: Cerebellum
https://www.readbyqxmd.com/read/27923179/structural-dynamics-of-casein-kinase-i-cki-from-malarial-parasite-plasmodium-falciparum-isolate-3d7-insights-from-theoretical-modelling-and-molecular-simulations
#6
Budheswar Dehury, Santosh Kumar Behera, Namita Mahapatra
The protein kinases (PKs), belonging to serine/threonine kinase (STKs), are important drug targets for a wide spectrum of diseases in human. Among protein kinases, the Casein Kinases (CKs) are vastly expanded in various organisms, where, the malarial parasite Plasmodium falciparum possesses a single member i.e., PfCKI, which can phosphorylate various proteins in parasite extracts in vitro condition. But, the structure-function relationship of PfCKI and dynamics of ATP binding is yet to be understood. Henceforth, an attempt was made to study the dynamics, stability, and ATP binding mechanisms of PfCKI through computational modelling, docking, molecular dynamics (MD) simulations, and MM/PBSA binding free energy estimation...
November 21, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/27920331/3d-model-analysis-of-ankle-flexion-on-anatomic-reduction-of-a-syndesmotic-injury
#7
Jason M Schon, Jacob D Mikula, Jonathon D Backus, Melanie B Venderley, Grant J Dornan, Robert F LaPrade, Thomas O Clanton
BACKGROUND: The effect of ankle positioning during suture-button fixation for syndesmosis repair on range of motion (ROM) and anatomic reduction has yet to be investigated. The purpose of this cadaveric study was to compare the effects of 3 different ankle positions during suture-button repair on volumetric reduction of the syndesmosis, fibular displacement, and ROM of the ankle using 3-dimensional computed tomography (CT) analysis. The null hypothesis was that ankle position during fixation would not affect syndesmotic volume restoration, fibular displacement, or ROM...
December 5, 2016: Foot & Ankle International
https://www.readbyqxmd.com/read/27918630/changes-in-gait-patterns-induced-by-rhythmic-auditory-stimulation-for-adolescents-with-acquired-brain-injury
#8
Soo Ji Kim, Yoon-Kyum Shin, Ga Eul Yoo, Hyun Ju Chong, Sung-Rae Cho
The effects of rhythmic auditory stimulation (RAS) on gait in adolescents with acquired brain injury (ABI) were investigated. A total of 14 adolescents with ABI were initially recruited, and 12 were included in the final analysis (n = 6 each). They were randomly assigned to the experimental (RAS) or the control (conventional gait training) groups. The experimental group received gait training with RAS three times a week for 4 weeks. For both groups, spatiotemporal parameters and kinematic data, such as dynamic motions of joints on three-dimensional planes during a gait cycle and the range of motion in each joint, were collected...
December 2016: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/27918291/approximate-analytical-solutions-to-the-double-stance-dynamics-of-the-lossy-spring-loaded-inverted-pendulum
#9
Mohammad Shahbazi, Uluç Saranlı, Robert Babuška, Gabriel A D Lopes
This paper introduces approximate time-domain solutions to the otherwise non-integrable double-stance dynamics of the 'bipedal' spring-loaded inverted pendulum (B-SLIP) in the presence of non-negligible damping. We first introduce an auxiliary system whose behavior under certain conditions is approximately equivalent to the B-SLIP in double-stance. Then, we derive approximate solutions to the dynamics of the new system following two different methods: (i) updated-momentum approach that can deal with both the lossy and lossless B-SLIP models, and (ii) perturbation-based approach following which we only derive a solution to the lossless case...
December 5, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27918236/meniere-s-migraine-and-motion-sickness
#10
John F Golding, Mitesh Patel
CONCLUSION: Elevated Motion Sickness Susceptibility (MSS) in Meniere?s disease (MD) is likely to be a consequence of the onset of MD and not migraine per se. OBJECTIVES: Pathologies of the vestibular system influence MSS. Bilateral vestibular deficits lower MSS, vestibular neuritis or benign paroxysmal positional vertigo have little overall effect, whereas vestibular migraine elevates MSS. However, less is known about MSS in MD, a condition in which many patients experience vestibular loss and migraine symptoms...
December 5, 2016: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/27918231/a-3d-assessment-and-feedback-tool-for-ankylosing-spondylitis-from-the-perspective-of-healthcare-professionals
#11
Shijuan Li, Stephen Kay, Stuart Porter
To investigate the utility of 3D visualization technology to augment assessment and feedback for Ankylosing Spondylitis (AS), a visualization prototype was developed, and both subjective and objective measures of current assessment instruments were compared. To verify and establish a base-line for the prototype's effectiveness, motion data and measurement data from a healthy adult in a laboratory environment were collected. To validate the prototype, a qualitative evaluation was undertaken using multiple methods including a pilot study, focus groups, and individual interviews...
December 5, 2016: Informatics for Health & Social Care
https://www.readbyqxmd.com/read/27917950/utility-of-real-time-prospective-motion-correction-promo-on-3d-t1-weighted-imaging-in-automated-brain-structure-measurements
#12
Keita Watanabe, Shingo Kakeda, Natsuki Igata, Rieko Watanabe, Hidekuni Narimatsu, Atsushi Nozaki, Dan Rettmann, Osamu Abe, Yukunori Korogi
PROspective MOtion correction (PROMO) can prevent motion artefacts. The aim of this study was to determine whether brain structure measurements of motion-corrected images with PROMO were reliable and equivalent to conventional images without motion artefacts. The following T1-weighted images were obtained in healthy subjects: (A) resting scans with and without PROMO and (B) two types of motion scans ("side-to-side" and "nodding" motions) with and without PROMO. The total gray matter volumes and cortical thicknesses were significantly decreased in motion scans without PROMO as compared to the resting scans without PROMO (p < 0...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917380/effect-of-dynamic-temperature-stimulus-to-plantar-surface-of-the-foot-in-the-standing-position
#13
Ryo Watanabe, Hiroyuki Kajimoto
We have previously found that a vertical force or tactile sensation occurs when the temperature of a participant's skin changes rapidly. In this illusion, upward motion, pressure, or force sensation is elicited when stimulus temperature rises rapidly, whereas in the opposite case, downward motion or pulling sensation is elicited. In this paper, we applied this phenomenon to the sole (plantar surface of the foot) to present the sensation of ground slope. To investigate this, we conducted an experiment that measured the correlation between stimulation temperature and front-back direction position of the center of gravity...
2016: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/27917249/perspectives-in-flow-based-microfluidic-gradient-generators-for-characterizing-bacterial-chemotaxis
#14
Christopher J Wolfram, Gary W Rubloff, Xiaolong Luo
Chemotaxis is a phenomenon which enables cells to sense concentrations of certain chemical species in their microenvironment and move towards chemically favorable regions. Recent advances in microbiology have engineered the chemotactic properties of bacteria to perform novel functions, but traditional methods of characterizing chemotaxis do not fully capture the associated cell motion, making it difficult to infer mechanisms that link the motion to the microbiology which induces it. Microfluidics offers a potential solution in the form of gradient generators...
November 2016: Biomicrofluidics
https://www.readbyqxmd.com/read/27916948/a-robust-and-device-free-system-for-the-recognition-and-classification-of-elderly-activities
#15
Fangmin Li, Mohammed Abdulaziz Aide Al-Qaness, Yong Zhang, Bihai Zhao, Xidao Luan
Human activity recognition, tracking and classification is an essential trend in assisted living systems that can help support elderly people with their daily activities. Traditional activity recognition approaches depend on vision-based or sensor-based techniques. Nowadays, a novel promising technique has obtained more attention, namely device-free human activity recognition that neither requires the target object to wear or carry a device nor install cameras in a perceived area. The device-free technique for activity recognition uses only the signals of common wireless local area network (WLAN) devices available everywhere...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916809/anatomical-calibration-through-post-processing-of-standard-motion-tests-data
#16
Weisheng Kong, Salvatore Sessa, Massimiliano Zecca, Atsuo Takanishi
The inertial measurement unit is popularly used as a wearable and flexible tool for human motion tracking. Sensor-to-body alignment, or anatomical calibration (AC), is fundamental to improve accuracy and reliability. Current AC methods either require extra movements or are limited to specific joints. In this research, the authors propose a novel method to achieve AC from standard motion tests (such as walking, or sit-to-stand), and compare the results with the AC obtained from specially designed movements. The proposed method uses the limited acceleration range on medial-lateral direction, and applies principal component analysis to estimate the sagittal plane, while the vertical direction is estimated from acceleration during quiet stance...
November 28, 2016: Sensors
https://www.readbyqxmd.com/read/27916560/thinning-of-articular-cartilage-after-joint-unloading-or-immobilization-an-experimental-investigation-of-the-pathogenesis-in-mice
#17
Masato Nomura, Naoyoshi Sakitani, Hiroyuki Iwasawa, Yuta Kohara, Shoko Takano, Yoshio Wakimoto, Hiroshi Kuroki, Hideki Moriyama
OBJECTIVE: Moderate mechanical stress generated by normal joint loading and movement is essential for the maintenance of healthy articular cartilage. However, the effects of reduced loading caused by the absence of weight bearing or joint motion on articular cartilage and subchondral bone is still poorly understood. We aimed to characterize morphological and metabolic responses of articular cartilage and subchondral bone to decreased mechanical stress in vivo. METHODS: Mice were subjected to periods of hindlimb unloading by tail suspension or external fixation of the knee joints...
December 1, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27916473/aseptic-revision-knee-arthroplasty-with-total-stabilizer-prostheses-achieves-similar-functional-outcomes-to-primary-total-knee-arthroplasty-at-2-years-a-longitudinal-cohort-study
#18
David F Hamilton, Philip M Simpson, James T Patton, Colin R Howie, Richard Burnett
BACKGROUND: Patient function is poorly characterized following revision total knee arthroplasty (TKA), although is generally accepted to be inferior to that following primary procedures. METHODS: Fifty-three consecutive aseptic revisions to total stabilizer devices were prospectively evaluated, preoperatively and at 6, 26, 52, and 104 weeks postoperatively, using the Oxford Knee Score (OKS), range of motion, pain rating scale, and timed functional performance battery...
October 31, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27916236/strain-imaging-with-a-bull-s-eye-map-for-detecting-significant-coronary-stenosis-during-dobutamine-stress-echocardiography
#19
Li-Tan Yang, Yuichiro Kado, Yasufumi Nagata, Kyoko Otani, Yutaka Otsuji, Masaaki Takeuchi
BACKGROUND: Accurate visual assessment of wall motion during dobutamine stress echocardiography (DSE) requires expertise; strain stress echocardiography thus has potential for the objective and reliable evaluation of stress-induced wall motion abnormalities. The aim of this study was to test the hypothesis that strain imaging also requires expertise. Diagnostic accuracy for significant coronary artery disease was compared between visual and strain analysis with a bull's-eye map, and the effect of expertise on readers' accuracy during DSE was determined...
December 1, 2016: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/27916038/-mid-to-long-term-outcomes-of-cervical-disc-arthroplasty-for-symptomatic-cervical-disc-disease-a-meta-analysis
#20
S L Kan, B Yang, G Z Ning, S J Gao, J C Sun, S Q Feng
Objective: To compare the benefits and harms of cervical disc arthroplasty (CDA) with anterior cervical discectomy and fusion(ACDF) for symptomatic cervical disc disease at mid- to long-term follow-up. Methods: Electronic searches were made in PubMed, EMBASE, and the Cochrane Library for randomized controlled trials with at least 48 moths follow-up.Outcomes were reported as relative risk or standardized mean difference.Meta-analysis was carried out using Revman version 5.3 and Stata version 12.0. Results: Seven trials were included, involving 2 302 participants...
December 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
keyword
keyword
5976
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"