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https://www.readbyqxmd.com/read/28350716/movement-strategies-among-groups-of-chronic-ankle-instability-coper-and-control
#1
S Jun Son, Hyunsoo Kim, Mattew K Seeley, J Ty Hopkins
INTRODUCTION: Comprehensive evaluation of movement strategies during functional movement is a difficult undertaking. Because of this challenge, studied movements have been over simplified. Furthermore, evaluating movement strategies at only a discrete time point(s) provide limited insight into how movement strategies may change or adapt in chronic ankle instability (CAI) patients. This study aimed to identify abnormal movement strategies in individuals with a history of ankle sprain injury during a sports maneuver compared to healthy controls...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350585/effect-of-anchor-length-on-the-pullout-strength-of-palatal-mini-implants
#2
Yu-Chuan Tseng, Chun-Chan Ting, Ju-Hui Wu, Hong-Sen Chen, Chun-Ming Chen
PURPOSE: The aim of this study was to evaluate the pullout strength of 3 different orthodontic mini implants. MATERIALS AND METHODS: Twenty-seven mini implants (diameter: 2 mm, length: 7 mm) were implanted into artificial bone (Sawbones; Pacific Research Laboratories Inc.) at depths of 3, 4, and 5 mm. The insertion torque (IT), resonance frequency (RF), pullout strength (PS), and anchor length (AL) were measured. One-way analysis of variance with Tukey honest significant difference (HSD) postcomparison were used to detect intergroup differences...
March 24, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28345417/the-effect-of-mechanical-loading-upon-extracellular-matrix-bioscaffold-mediated-skeletal-muscle-remodeling
#3
Jenna Lynn Dziki, Ross M Giglio, Brian M Sicari, Derek S Wang, Riddhi M Gandhi, Ricardo Londono, Christopher L Dearth, Stephen F Badylak
Mounting evidence suggests that site-appropriate loading of implanted extracellular matrix (ECM) bioscaffolds and the surrounding microenvironment is an important tissue remodeling determinant, though the role at the cellular level in ECM-mediated skeletal muscle remodeling remains unknown. The present study evaluates cross-talk between progenitor cells and macrophages during mechanical loading in ECM-mediated skeletal muscle repair. Myoblasts were exposed to solubilized ECM bioscaffolds and were mechanically loaded at 10% strain, 1 Hz for 5 hours...
March 27, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28344463/curcumin-and-piperine-supplementation-and-recovery-following-exercise-induced-muscle-damage-a-randomized-controlled-trial
#4
Barthélémy Delecroix, Abd Elbasset Abaïdia, Cédric Leduc, Brian Dawson, Grégory Dupont
The aim of this study was to analyze the effects of oral consumption of curcumin and piperine in combination on the recovery kinetics after exercise-induced muscle damage. Forty-eight hours before and following exercise-induced muscle damage, ten elite rugby players consumed curcumin and piperine (experimental condition) or placebo. A randomized cross-over design was performed. Concentric and isometric peak torque for the knee extensors, one leg 6 seconds sprint performance on a non-motorized treadmill, counter movement jump performance, blood creatine kinase concentration and muscle soreness were assessed immediately after exercise, then at 24h, 48h and 72h post-exercise...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344445/effects-of-static-and-dynamic-stretching-on-the-isokinetic-peak-torques-and-electromyographic-activities-of-the-antagonist-muscles
#5
Abdullah Serefoglu, Ufuk Sekir, Hakan Gür, Bedrettin Akova
The aim of this study was to investigate if static and dynamic stretching exercises of the knee muscles (quadriceps and hamstring muscles) have any effects on concentric and eccentric isokinetic peak torques and electromyographic amplitudes (EMG) of the antagonist muscles. Twenty healthy male athletes (age between 18-30 years) voluntarily participated in this study. All of the subjects visited the laboratory to complete the following intervention in a randomized order on 5 separate days; (a) non-stretching (control), (b) static stretching of the quadriceps muscles, (c) static stretching of the hamstring muscles, (d) dynamic stretching of the quadriceps muscles, and (e) dynamic stretching of the hamstring muscles...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344020/the-incidence-of-isolated-penile-torsion-in-north-india-a-study-of-5-018-male-neonates
#6
Amilal Bhat, Mahakshit Bhat, Vinay Kumar, Suresh Goyal, Akshita Bhat, Madhu Patni
OBJECTIVE: Congenital penile torsion is a three-dimensional deformity with helical rotation of the distal corporal bodies with the penile crurae remaining fixed to the pubic rami. The first case of congenital penile torsion (hypospadias) was described in 1857. Isolated penile torsion is an under-reported anomaly. The reported incidence of isolated penile torsion is 1.7-27% and severe torsion is 0.7%. There are no studies available from Indian subcontinent on the incidence of isolated penile torque...
March 1, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/28343668/clinician-generated-torque-on-abutment-screws-using-different-hand-screwdrivers
#7
Marzieh Alikhasi, Mahmoud Kazemi, Hamid Jalali, Shervin Hashemzadeh, Hamide Dodangeh, Burak Yilmaz
STATEMENT OF PROBLEM: Many clinicians use hand screwdrivers to tighten prosthetic and abutment screws. The impact of the screwdriver type, the location of the implant, and the sex of the practitioner on the generated torque is not well understood. PURPOSE: The purpose of this in vitro study was to compare the torque generated by different hand screwdrivers when used in the anterior and posterior regions and to evaluate the correlation between the applied torque and the sex and body mass index (BMI) of the practitioner...
March 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28341663/muscle-tendon-mechanics-explain-unexpected-effects-of-exoskeleton-assistance-on-metabolic-rate-during-walking
#8
Rachel W Jackson, Christopher L Dembia, Scott L Delp, Steven H Collins
The goal of this study was to gain insight into how ankle exoskeletons affect the behavior of the plantarflexor muscles during walking. Using data from previous experiments, we performed electromyography-driven simulations of musculoskeletal dynamics to explore how changes in exoskeleton assistance affected plantarflexor muscle-tendon mechanics, particularly for the soleus. We used a model of muscle energy consumption to estimate individual muscle metabolic rate. As average exoskeleton torque was increased, while no net exoskeleton work was provided, a reduction in tendon recoil led to an increase in positive mechanical work performed by the soleus muscle fibers...
March 24, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28341335/robust-control-of-a-spin-stabilized-spacecraft-via-a-1dof-gimbaled-thruster-and-two-reaction-wheels
#9
Hamed Kouhi, Mansour Kabganian, Farhad Fani Saberi, Morteza Shahravi
In impulsive orbital maneuvers, thrust vector misalignment from the center of mass (C.M) results in a large disturbance torque. In this paper a thrusting maneuver system is proposed and studied which is based on the combination of a one degree of freedom (1DoF) gimbaled-thruster, two reaction wheels (RWs) and spin-stabilization. The main goals are disturbance rejection and thrust vector stabilization without using reaction control systems (RCS). The nonlinear two-body dynamics of the proposed system is formulated...
January 2017: ISA Transactions
https://www.readbyqxmd.com/read/28341175/enhanced-mechanical-and-thermal-properties-of-poly-vinyl-alcohol-corn-starch-blends-by-nanoclay-intercalation
#10
Huafeng Tian, Kai Wang, Di Liu, Jiaan Yan, Aimin Xiang, A Varada Rajulu
Poly (vinyl alcohol) (PVA)/corn starch blend films with enhanced properties were fabricated by melt processing and montmorillonite (MMT) reinforcing. It was revealed that strong hydrogen bonding occurred between the abundant OH groups of the matrix and polar Si-O-Si and -OH groups of MMT. The highly exfoliated MMT nanolayers were randomly dispersed in the matrix containing MMT lower than 10wt%, whereas the intercalated structure was predominant with MMT content higher than 10wt%. With the increase of MMT, the glass transition temperature as well as equilibrium torque increased...
March 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28339587/incisor-inclination-and-perceived-tooth-colour-changes
#11
Philip Ciucchi, Stavros Kiliaridis
Introduction: Social attractiveness is influenced by a variety of different smile-related factors. We evaluated whether the degree of upper central incisor proclination can result in tooth colour change. Methods: Forty young adult subjects (20-25 years) in good health with a complete sound dentition were selected. The subjects were seated in standardized light conditions with an above-directed light source. Their natural head position was stated as 0 degrees. To mimic the range of possible anterior torque movements they were asked to tilt their heads upward +15 degrees (upward tilting) and downward -15 degrees (downward tilting)...
January 25, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28339580/the-integration-of-orthodontic-miniscrews-under-mechanical-loading-a-pre-clinical-study-in-rabbit
#12
B Giuliano Maino, Alberto Di Blasio, Davide Spadoni, Francesca Ravanetti, Carlo Galli, Antonio Cacchioli, Christos Katsaros, Mauro Gandolfini
Introduction: Orthodontic miniscrews are an increasingly popular choice to achieve absolute anchorage. The temporary use of miniscrews and their recent introduction have limited the debate over the biological aspect of the materials to that of the surface that permeates the field of dental implants. The aim of the present study was to investigate the integration of grade 5 titanium mini-implants with machined or sand blasted acid etched surface (SAE) under mechanical load in a rabbit tibia model of implant integration...
January 18, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28339249/electric-control-of-dirac-quasiparticles-by-spin-orbit-torque-in-an-antiferromagnet
#13
L Šmejkal, J Železný, J Sinova, T Jungwirth
Spin orbitronics and Dirac quasiparticles are two fields of condensed matter physics initiated independently about a decade ago. Here we predict that Dirac quasiparticles can be controlled by the spin-orbit torque reorientation of the Néel vector in an antiferromagnet. Using CuMnAs as an example, we formulate symmetry criteria allowing for the coexistence of topological Dirac quasiparticles and Néel spin-orbit torques. We identify the nonsymmorphic crystal symmetry protection of Dirac band crossings whose on and off switching is mediated by the Néel vector reorientation...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28338383/inter-session-reliability-of-isokinetic-strength-testing-in-knee-and-elbow-extension-and-flexion-using-the-bte-primusrs
#14
Alexander Törpel, Tim Becker, Angelina Thiers, Dennis Hamacher, Lutz Schega
CONTEXT: The use of isokinetic dynamometers playing an important role in different settings of sports and medicine. Therefore, a high reliability of these devices is required. OBJECTIVE: The aim of this study was to examine the inter-session reliability of the dynamometer BTE PrimusRS regarding to the isolated single-joint exercises extension / flexion of the knee and elbow for isokinetic testing. DESIGN: Inter-session reliability. SETTING: Clinical settings and sports science...
March 24, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28337434/influence-of-power-delivery-timing-on-the-energetics-and-biomechanics-of-humans-wearing-a-hip-exoskeleton
#15
Aaron J Young, Jessica Foss, Hannah Gannon, Daniel P Ferris
A broad goal in the field of powered lower limb exoskeletons is to reduce the metabolic cost of walking. Ankle exoskeletons have successfully achieved this goal by correctly timing a plantarflexor torque during late stance phase. Hip exoskeletons have the potential to assist with both flexion and extension during walking gait, but the optimal timing for maximally reducing metabolic cost is unknown. The focus of our study was to determine the best assistance timing for applying hip assistance through a pneumatic exoskeleton on human subjects...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28332446/scaling-effects-in-spiral-capsule-robots
#16
Liang Liang, Rong Hu, Bai Chen, Yong Tang, Yan Xu
Spiral capsule robots can be applied to human gastrointestinal tracts and blood vessels. Because of significant variations in the sizes of the inner diameters of the intestines as well as blood vessels, this research has been unable to meet the requirements for medical applications. By applying the fluid dynamic equations, using the computational fluid dynamics method, to a robot axial length ranging from 10(-5) to 10(-2) m, the operational performance indicators (axial driving force, load torque, and maximum fluid pressure on the pipe wall) of the spiral capsule robot and the fluid turbulent intensity around the robot spiral surfaces was numerically calculated in a straight rigid pipe filled with fluid...
April 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28332445/dynamic-virtual-simulation-of-the-occurrence-and-severity-of-edge-loading-in-hip-replacements-associated-with-variation-in-the-rotational-and-translational-surgical-position
#17
Joanna Leng, Mazen Al-Hajjar, Ruth Wilcox, Alison Jones, David Barton, John Fisher
Variation in the surgical positioning of total hip replacement can result in edge loading of the femoral head on the rim of the acetabular cup. Previous work has reported the effect of edge loading on the wear of hip replacement bearings with a fixed level of dynamic biomechanical hip separation. Variations in both rotational and translational surgical positioning of the hip joint replacement combine to influence both the biomechanics and the tribology including the severity of edge loading, the amount of dynamic separation, the force acting on the rim of the cup and the resultant wear and torque acting on the cup...
April 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28331221/relationship-between-joint-torque-and-muscle-fascicle-shortening-at-various-joint-angles-and-intensities-in-the-plantar-flexors
#18
Atsuki Fukutani, Jun Misaki, Tadao Isaka
Because it is difficult to measure tendon length changes directly in humans, tendon length changes during dynamic movement have been evaluated indirectly from changes in muscle fascicle length and joint angle. The purpose of this study was to examine the validity of the indirect method. Twitch contractions of the ankle plantar flexors were evoked isometrically in eight subjects. Twitch contractions evoked by singlet, doublet, and triplet stimulations were conducted at dorsiflexion 20° (DF20), plantar flexion 0° (PF0), and plantar flexion 20° (PF20)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28329416/influence-of-continuous-rotation-or-reciprocation-of-optimum-torque-reverse-motion-on-cyclic-fatigue-resistance-of-nickel-titanium-rotary-instruments
#19
E Pedullà, G Corsentino, E Ambu, F Rovai, F Campedelli, S Rapisarda, G R La Rosa, E Rapisarda, S Grandini
AIM: To evaluate the resistance to cyclic fatigue of ProTaper Next (PTN; Dentsply Sirona, Ballaigues, Switzerland), Revo-S (Micro-Mega, Besançon, France), Mtwo (Sweden & Martina, Padova, Italy), Twisted Files (TF, SybronEndo, Orange, CA, USA) and EndoWave (J Morita Corporation, Osaka, Japan) used in continuous rotation or in reciprocation of Optimum Torque Reverse motion (OTR). METHODOLOGY: A total of 120 nickel-titanium files were tested. Twenty-four instruments for each brand were divided into 2 groups (n = 12) on the basis of the motion tested: continuous rotation (Group 1) or reciprocation of OTR motion (Group 2)...
March 22, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28327692/immediate-immediate-delayed-6%C3%A2-weeks-and-delayed-4%C3%A2-months-post-extractive-single-implants-1-year-post-loading-data-from-a-randomised-controlled-trial
#20
Marco Esposito, Giovanni Zucchelli, Gioacchino Cannizzaro, Luigi Checchi, Carlo Barausse, Anna Trullenque-Eriksson, Pietro Felice
PURPOSE: To compare the clinical outcome of single implants placed immediately after tooth extraction with implants placed 6 weeks after tooth extraction (immediate-delayed placement), and with implants placed after 4-month extraction and socket healing (delayed placement). MATERIALS AND METHODS: Two-hundred and ten (210) patients requiring a single implant-supported crown to replace a tooth to be extracted were randomised to receive immediate post-extractive implants (70 patients), immediate-delayed implants at 6 weeks (70 patients), and delayed implants after 4 months of healing (70 patients) according to a parallel group design...
2017: European Journal of Oral Implantology
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