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https://www.readbyqxmd.com/read/29353180/differential-changes-in-the-spinal-segmental-locomotor-output-in-hereditary-spastic-paraplegia
#1
G Martino, Y Ivanenko, M Serrao, A Ranavolo, F Draicchio, M Rinaldi, C Casali, F Lacquaniti
OBJECTIVE: A comprehensive treatment of Hereditary Spastic Paraplegia (HSP) should consider the specific pathophysiological changes in the spinal cord. Here we reported a detailed characterization of the spinal motoneuronal output in HSP during locomotion. METHODS: We recorded kinematics and electromyographic (EMG) activity of 12 leg muscles in 29 patients with pure forms of HSP and compared them with 30 controls while walking at matched speeds. We assessed the spinal locomotor output by evaluating EMG patterns and by mapping them onto the rostrocaudal location of the spinal motoneuron pools...
December 23, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29353139/effects-of-lighting-illuminance-levels-on-stair-negotiation-performance-in-individuals-with-visual-impairment
#2
Aliah F Shaheen, Alexandros Sourlas, Khim Horton, Christopher McLean, David Ewins, David Gould, Salim Ghoussayni
BACKGROUND: Stair-related falls of older people cause a substantial financial and social burden. Deterioration of the visual system amongst other factors put older people at a high risk of falling. Improved lighting is often recommended. The aim of this study was to investigate the effect of lighting illuminance on stair negotiation performance in older individuals with visual impairment. METHODS: Eleven participants aged 60 or over with a vision of 6/18 or worse ascended and descended a staircase under: 50 lx, 100 lx, 200 lx, 300 lx and distributed 200 lx lighting...
January 16, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29352136/gphenovision-a-ground-mobile-system-with-multi-modal-imaging-for-field-based-high-throughput-phenotyping-of-cotton
#3
Yu Jiang, Changying Li, Jon S Robertson, Shangpeng Sun, Rui Xu, Andrew H Paterson
Imaging sensors can extend phenotyping capability, but they require a system to handle high-volume data. The overall goal of this study was to develop and evaluate a field-based high throughput phenotyping system accommodating high-resolution imagers. The system consisted of a high-clearance tractor and sensing and electrical systems. The sensing system was based on a distributed structure, integrating environmental sensors, real-time kinematic GPS, and multiple imaging sensors including RGB-D, thermal, and hyperspectral cameras...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351875/trunk-and-pelvic-dynamics-during-transient-turns-among-individuals-with-unilateral-traumatic-lower-limb-amputation
#4
Pawel R Golyski, Brad D Hendershot
Prior work has identified alterations in trunk-pelvic dynamics with lower limb amputation (LLA) during in-line walking; however, evaluations of other ambulatory tasks are limited. Turns are ubiquitous in daily life but can be challenging for individuals with LLA, prompting additional or unique proximal compensations when changing direction, which over time may lead to development of low back pain. We hypothesized such proximal kinematic differences between persons with and without LLA would exist in the sagittal and frontal planes...
January 16, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29351276/static-length-changes-of-cochlear-outer-hair-cells-can-tune-low-frequency-hearing
#5
Nikola Ciganović, Rebecca L Warren, Batu Keçeli, Stefan Jacob, Anders Fridberger, Tobias Reichenbach
The cochlea not only transduces sound-induced vibration into neural spikes, it also amplifies weak sound to boost its detection. Actuators of this active process are sensory outer hair cells in the organ of Corti, whereas the inner hair cells transduce the resulting motion into electric signals that propagate via the auditory nerve to the brain. However, how the outer hair cells modulate the stimulus to the inner hair cells remains unclear. Here, we combine theoretical modeling and experimental measurements near the cochlear apex to study the way in which length changes of the outer hair cells deform the organ of Corti...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29351262/imu-to-segment-assignment-and-orientation-alignment-for-the-lower-body-using-deep-learning
#6
Tobias Zimmermann, Bertram Taetz, Gabriele Bleser
Human body motion analysis based on wearable inertial measurement units (IMUs) receives a lot of attention from both the research community and the and industrial community. This is due to the significant role in, for instance, mobile health systems, sports and human computer interaction. In sensor based activity recognition, one of the major issues for obtaining reliable results is the sensor placement/assignment on the body. For inertial motion capture (joint kinematics estimation) and analysis, the IMU-to-segment (I2S) assignment and alignment are central issues to obtain biomechanical joint angles...
January 19, 2018: Sensors
https://www.readbyqxmd.com/read/29350554/quadriceps-neuromuscular-function-and-jump-landing-sagittal-plane-knee-biomechanics-after-anterior-cruciate-ligament-reconstruction
#7
Sarah H Ward, Troy Blackburn, Darin A Padua, Laura E Stanley, Matthew S Harkey, Brittney A Luc-Harkey, Brian G Pietrosimone
CONTEXT:   Aberrant biomechanics may affect force attenuation at the knee during dynamic activities, potentially increasing the risk of sustaining a knee injury or hastening the development of osteoarthritis after anterior cruciate ligament reconstruction (ACLR). Impaired quadriceps neuromuscular function has been hypothesized to influence the development of aberrant biomechanics. OBJECTIVE:   To determine the association between quadriceps neuromuscular function (strength, voluntary activation, and spinal-reflex and corticomotor excitability) and sagittal-plane knee biomechanics during jump landings in individuals with ACLR...
January 19, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29350551/hip-and-knee-kinematics-and-kinetics-during-landing-tasks-after-anterior-cruciate-ligament-reconstruction-a-systematic-review-and-meta-analysis
#8
Adam S Lepley, Christopher M Kuenze
OBJECTIVE:   To evaluate the current evidence concerning kinematic and kinetic strategies adopted during dynamic landing tasks by patients with anterior cruciate ligament reconstruction (ACLR). DATA SOURCES:   PubMed, Web of Science. STUDY SELECTION:   Original research articles that evaluated kinematics or kinetics (or both) during a landing task in those with a history of ACLR were included. DATA EXTRACTION:   Methodologic quality was assessed using the modified Downs and Black checklist...
January 19, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29350088/the-use-of-synthetic-ligaments-in-the-design-of-an-enhanced-stability-total-knee-joint-replacement
#9
Michael D Stokes, Brendan C Greene, Luke W Pietrykowski, Taylor M Gambon, Caroline E Bales, John D DesJardins
Current total knee replacement designs work to address clinically desired knee stability and range of motion through a balance of retained anatomy and added implant geometry. However, simplified implant geometries such as bearing surfaces, posts, and cams are often used to replace complex ligamentous constraints that are sacrificed during most total knee replacement procedures. This article evaluates a novel total knee replacement design that incorporates synthetic ligaments to enhance the stability of the total knee replacement system...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29350015/-application-of-finite-element-method-in-spinal-biomechanics
#10
REVIEW
Qiang Liu, Jun Zhang, Shu-Chun Sun, Fei Wang
The finite element model is one of the most important methods in study of modern spinal biomechanics, according to the needs to simulate the various states of the spine, calculate the stress force and strain distribution of the different groups in the state, and explore its principle of mechanics, mechanism of injury, and treatment effectiveness. In addition, in the study of the pathological state of the spine, the finite element is mainly used in the understanding the mechanism of lesion location, evaluating the effects of different therapeutic tool, assisting and completing the selection and improvement of therapeutic tool, in order to provide a theoretical basis for the rehabilitation of spinal lesions...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29348998/meniscal-repair-with-fibrin-clot-augmentation
#11
Jorge Chahla, Nicholas I Kennedy, Andrew G Geeslin, Gilbert Moatshe, Mark E Cinque, Nicholas N DePhillipo, Robert F LaPrade
Meniscal injuries and meniscal loss are associated with changes in knee kinematics and loading, ultimately leading to poor functional outcomes and increased risk of progression to osteoarthritis. Biomechanical studies have shown restored knee function, and clinical studies have reported improved outcomes and decreased risk of osteoarthritis after meniscal repair. This has led orthopaedic surgeons to try and save the meniscus by repair whenever possible, as shown by increasing incidence of meniscal repair surgeries...
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29347682/front-propagation-in-a-regular-vortex-lattice-dependence-on-the-vortex-structure
#12
E Beauvier, S Bodea, A Pocheau
We investigate the dependence on the vortex structure of the propagation of fronts in stirred flows. For this, we consider a regular set of vortices whose structure is changed by varying both their boundary conditions and their aspect ratios. These configurations are investigated experimentally in autocatalytic solutions stirred by electroconvective flows and numerically from kinematic simulations based on the determination of the dominant Fourier mode of the vortex stream function in each of them. For free lateral boundary conditions, i...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347643/nonhelical-turbulence-and-the-inverse-transfer-of-energy-a-parameter-study
#13
Johannes Reppin, Robi Banerjee
We explore the phenomenon of the recently discovered inverse transfer of energy from small to large scales in decaying magnetohydrodynamical turbulence by Brandenburg et al. [Phys. Rev. Lett. 114, 075001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.075001], even for nonhelical magnetic fields. For this investigation we mainly employ the Pencil Code performing a parameter study, where we vary the Prandtl number, the kinematic viscosity, and the initial spectrum. We find that to get a decay that exhibits this inverse transfer, large Reynolds numbers (O∼10^{3}) are needed and low Prandtl numbers of the order unity Pr=1 are preferred...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347520/relativistic-analysis-of-stochastic-kinematics
#14
Massimiliano Giona
The relativistic analysis of stochastic kinematics is developed in order to determine the transformation of the effective diffusivity tensor in inertial frames. Poisson-Kac stochastic processes are initially considered. For one-dimensional spatial models, the effective diffusion coefficient measured in a frame Σ moving with velocity w with respect to the rest frame of the stochastic process is inversely proportional to the third power of the Lorentz factor γ(w)=(1-w^{2}/c^{2})^{-1/2}. Subsequently, higher-dimensional processes are analyzed and it is shown that the diffusivity tensor in a moving frame becomes nonisotropic: The diffusivities parallel and orthogonal to the velocity of the moving frame scale differently with respect to γ(w)...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347180/lattice-boltzmann-modeling-and-simulation-of-liquid-jet-breakup
#15
Shimpei Saito, Yutaka Abe, Kazuya Koyama
A three-dimensional color-fluid lattice Boltzmann model for immiscible two-phase flows is developed in the framework of a three-dimensional 27-velocity (D3Q27) lattice. The collision operator comprises the D3Q27 versions of three suboperators: a multiple-relaxation-time (MRT) collision operator, a generalized Liu-Valocchi-Kang perturbation operator, and a Latva-Kokko-Rothman recoloring operator. A D3Q27 version of an enhanced equilibrium distribution function is also incorporated into this model to improve the Galilean invariance...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346082/distal-upper-limb-kinematics-during-functional-everyday-tasks
#16
Ben Stansfield, Scott Rooney, Lisa Brown, Matthew Kay, Lisa Spoettl, Shivaramkumar Shanmugam
Quantitative characterisation of upper limb motion allows the evaluation of the effect of pathology on functional task performance, potentially directing rehabilitation strategies. Movement patterns of the distal upper limb in healthy adults during functional tasks have not been extensively characterised. During five loaded functional tasks (drinking from a glass, pouring from a kettle, turning a handle, lifting a bag to a shelf, turning a key) the movement patterns were characterised using three-dimensional motion analysis with a minimal marker set in 16 healthy adults (10 M,6F, 27 (IQR:25-43)years)...
January 10, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29345541/running-mechanics-and-metabolic-responses-with-water-bottles-and-bottle-belt-holders
#17
Heather K Vincent, Laura A Zdziarski, Kyle Fallgatter, Giorgio Negron, Cong Chen, Trevor Leavitt, MaryBeth Horodyski, Joseph G Wasser, Kevin R Vincent
PURPOSE: This study determined whether differential kinematics, kinetics, rates of energy use and cardiopulmonary responses occurred during running with water bottles and bottle belt holders compared to running only. METHODS: Trained runners (N=42; 27.2±6.4 yr) ran on an instrumented treadmill for four conditions in a randomized order: 1) control run (CON); 2) hand-held full water bottle (FULL, 16.9 fluid oz; 454 g); 3) hand-held half-full water bottle (HALF, 8...
January 18, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29344540/standing-height-as-a-prevention-measure-for-overuse-injuries-of-the-back-in-alpine-ski-racing-a-kinematic-and-kinetic-study-of-giant-slalom
#18
Jörg Spörri, Josef Kröll, Benedikt Fasel, Kamiar Aminian, Erich Müller
Background: In alpine ski racing, typical loading patterns of the back include a combined occurrence of spinal bending, torsion, and high peak loads. These factors are known to be associated with high spinal disc loading and have been suggested to be attributable to different types of spine deterioration. However, little is known about the effect of standing height (ie, the distance between the bottom of the running surface of the ski and the ski boot sole) on the aforementioned back loading patterns...
January 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29343634/fluttering-of-growing-leaves-as-a-way-to-reach-flatness-experimental-evidence-on-persea-americana
#19
Julien Derr, Renaud Bastien, Étienne Couturier, Stéphane Douady
Simple leaves show unexpected growth motions: the midrib of the leaves swings periodically in association with buckling events of the leaf blade, giving the impression that the leaves are fluttering. The quantitative kinematic analysis of this motion provides information about the respective growth between the main vein and the lamina. Our three-dimensional reconstruction of an avocado tree leaf shows that the conductor of the motion is the midrib, presenting continuous oscillations and inducing buckling events on the blade...
January 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29343188/technique-selection-in-young-female-gymnasts-elbow-and-wrist-joint-loading-during-the-cartwheel-and-round-off
#20
Roman Farana, Timothy Exell, Gerda Strutzenberger, Gareth Irwin
Biophysical loading of the elbow and wrist is a potential reason for chronic lesions in gymnastics and present a real concern for coaches, scientist and clinicians. Previous research has identified injury risk factors during round-off (RO) skills in elite female gymnasts. The aim of this study was to investigate key elbow and wrist joint injury risk factors during different techniques of fundamental cartwheel (CW) and RO skills performed by young female artistic gymnasts. Seventeen active young female gymnasts performed 30 successful trials of both CW and RO from a hurdle step with three different hand positions (parallel (10), T-shape (10) and reverse (10))...
January 17, 2018: European Journal of Sport Science
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