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https://www.readbyqxmd.com/read/28884216/standardized-unfold-mapping-a-technique-to-permit-left-atrial-regional-data-display-and-analysis
#1
Steven E Williams, Catalina Tobon-Gomez, Maria A Zuluaga, Henry Chubb, Constantine Butakoff, Rashed Karim, Elena Ahmed, Oscar Camara, Kawal S Rhode
PURPOSE: Left atrial arrhythmia substrate assessment can involve multiple imaging and electrical modalities, but visual analysis of data on 3D surfaces is time-consuming and suffers from limited reproducibility. Unfold maps (e.g., the left ventricular bull's eye plot) allow 2D visualization, facilitate multimodal data representation, and provide a common reference space for inter-subject comparison. The aim of this work is to develop a method for automatic representation of multimodal information on a left atrial standardized unfold map (LA-SUM)...
September 7, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28864229/force-time-characteristics-during-sustained-maximal-handgrip-effort-according-to-age-and-clinical-condition
#2
L De Dobbeleer, I Beyer, R Njemini, S Pleck, N Zonnekein, T Mets, I Bautmans
BACKGROUND: Muscle fatigue, a prominent symptom in older patients, can be assessed by sustained maximal handgrip testing. The force decline during sustained maximal contraction is described for young adults, but data for elderly persons are scarce. The aim of this study was to investigate force-time characteristics during a sustained maximal handgrip effort according to age and clinical condition. METHODS AND MATERIALS: Force-time data were continuously recorded during sustained maximal grip effort in 91 elderly patients (aged 83±5years), 100 elderly controls (aged 74±5years) and 100 young controls (aged 23±3years)...
August 31, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28844292/comparison-of-plantar-pressure-distribution-in-patients-with-hallux-valgus-and-healthy-matched-controls
#3
Takashi Hida, Ryuzo Okuda, Toshito Yasuda, Tsuyoshi Jotoku, Hiroaki Shima, Masashi Neo
BACKGROUND: Detailed information regarding differences in plantar pressure distribution between hallux valgus and healthy feet is unavailable. The purposes of the present study were to clarify the characteristics of the plantar pressure distribution in patients with hallux valgus compared with healthy matched controls and to determine whether hallux valgus leads to dysfunction of the great toe during walking. METHODS: The study consisted of 25 patients with symptomatic moderate-to-severe hallux valgus (HV group) and 13 healthy matched volunteers (C group) without hallux valgus...
August 22, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28843185/effects-of-flexible-and-rigid-rocker-profiles-on-in-shoe-pressure
#4
Roy Reints, Juha M Hijmans, Johannes G M Burgerhof, Klaas Postema, Gijsbertus J Verkerke
Rocker profiles are commonly used in the prevention of diabetic foot ulcers. Rockers are mostly stiffened to restrict toe plantarflexion to ensure proper offloading. It is also described that toe dorsiflexion should be restricted. However, the difference in effect on plantar pressure between rigid rockers that restrict this motion and flexible rockers that do not is unknown. In-shoe plantar pressure data were collected for a control shoe and the same shoe with rigid and flexible rockers with the apex positioned at 50% and 60%...
August 12, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28833237/dynamic-optimization-of-stimulation-frequency-to-reduce-isometric-muscle-fatigue-using-a-modified-hill-huxley-model-a
#5
Brian D Doll, Nicholas A Kirsch, Xuefeng Bao, Brad E Dicianno, N Sharma
INTRODUCTION: Optimal frequency modulation during functional electrical stimulation (FES) may minimize or delay the onset of FES-induced muscle fatigue. METHODS: An offline dynamic optimization method, constrained to a modified Hill-Huxley model, was used to determine the minimum number of pulses that would maintain a constant desired isometric contraction force. RESULTS: Six able-bodied subjects were recruited for the experiments, and their quadriceps muscles were stimulated while they sat on a leg extension machine...
August 18, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28753391/differences-in-forearm-strength-endurance-and-hemodynamic-kinetics-between-male-boulderers-and-lead-rock-climbers
#6
S Fryer, K J Stone, J Sveen, T Dickson, V España-Romero, D Giles, J Baláš, L Stoner, N Draper
This study examined differences in the oxygenation kinetics and strength and endurance characteristics of boulderers and lead sport climbers. Using near infrared spectroscopy, 13-boulderers, 10-lead climbers, and 10-controls completed assessments of oxidative capacity index and muscle oxygen consumption (mV˙O2) in the flexor digitorum profundus (FDP), and extensor digitorum communis (EDC). Additionally, forearm strength (maximal volitional contraction MVC), endurance (force-time integral FTI at 40% MVC), and forearm volume (FAV and ΔFAV) was assessed...
July 28, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28745469/reliability-of-bounce-drop-jump-parameters-within-elite-male-rugby-players
#7
Lisa Costley, Eric Wallace, Michael Johnston, Rodney Kennedy
BACKGROUND: The aims of the study were to investigate the number of familiarisation sessions required to establish reliability of the bounce drop jump (BDJ) and subsequent reliability once familiarisation is achieved. METHOD: Seventeen trained male athletes completed 4 BDJs in 4 separate testing sessions. Force-time data from a 20 cm BDJ was obtained using two force plates (ensuring ground contact < 250 ms). Subjects were instructed to 'jump for maximal height and minimal contact time' while the best and average of four jumps were compared...
July 25, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28743301/loading-pattern-of-postoperative-hallux-valgus-feet-with-and-without-transfer-metatarsalgia-a-case-control-study
#8
Xiang Geng, Dichao Huang, Xu Wang, Chao Zhang, Jiazhang Huang, Xin Ma, Li Chen, Chen Wang, Junsheng Yang, Heng Wang
BACKGROUND: Postoperative transfer metatarsalgia is a common complication after hallux valgus surgeries. Shortening of the first metatarsal is traditionally thought to be the primary cause of it. However, we speculate the abnormal loading pattern during gait is the real reason. This study is to determine specific differences in the loading patterns between reconstructive hallux valgus (HV) feet with and without postoperative transfer metatarsalgia, so as to find risky loading characteristics of this complication...
July 25, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28728611/effect-of-electrode-position-of-low-intensity-neuromuscular-electrical-stimulation-on-the-evoked-force-in-the-quadriceps-femoris-muscle
#9
Kohei Watanabe, Shuhei Kawade, Toshio Moritani
OBJECTIVE: The present study aimed to test the effect of the electrode position and inter-electrode distance on the evoked force by neuromuscular electrical stimulation (NMES) with a low current intensity and a single pair of electrodes. Knee extensor forces during NMES to quadriceps femoris muscles were compared among four different electrode configurations in seven healthy men. Electrodes were located at 10 cm proximal and 15 cm distal (P10-D15), 10 cm proximal and 10 cm distal (P10-D10), 5 cm proximal and 15 cm distal, and 5 cm proximal and 10 cm distal (P5-D10) to the center of the longitudinal axis of the quadriceps femoris muscles...
July 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28722822/-test-retest-reliability-of-wide-pulse-high-frequency-nmes-evoked-force
#10
Daria Neyroud, Sidney Grosprêtre, Julien Gondin, Bengt Kayser, Nicolas Place
INTRODUCTION: We aimed to compare forces evoked by wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (NMES) delivered to a nerve trunk vs. muscle belly and to assess their test-retest intra- and inter-individual reliability. METHODS: Forces evoked during two sessions with WPHF NMES delivered over the tibial nerve trunk and two over the triceps surae muscle belly were compared. Ten individuals participated in four sessions involving ten 20-s WPHF NMES contractions interspaced by 40 s recovery...
July 19, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28713455/a-pilot-study-of-the-effect-of-outsole-hardness-on-lower-limb-kinematics-and-kinetics-during-soccer-related-movements
#11
Dong Sun, Qichang Mei, Julien S Baker, Xuewen Jia, Yaodong Gu
The purpose of this study was to investigate the effect of different outsole hardness of turf cleats shoes on the lower limb kinematics and kinetics of soccer players playing on artificial turf. The participants were required to complete tasks of straight running and 45° left sidestep cutting movements, respectively, at the speed of 4.5 ± 0.2 m/s on artificial turf. They were asked to randomly select turf cleats shoes with a soft outsole (SO), medium hardness outsole (MO) and hard outsole (HO). During the stance phase of straight running, peak pressure and force-time integral in medial forefoot (MFF) of players wearing cleats shoes with MO were significantly higher than those wearing cleats shoes with SO...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28660372/a-finite-element-study-of-traditional-chinese-cervical-manipulation
#12
Zhen Deng, Kuan Wang, Huihao Wang, Tianying Lan, Hongsheng Zhan, Wenxin Niu
PURPOSE: Traditional Chinese cervical manipulation (TCCM) has been claimed as an effective treatment for diseases of the cervical spine, but its biomechanical effects on the vertebral body and intervertebral discs remain unclear. The aim of this study was to develop and validate a detailed finite element model of cervical spine, which was then used to investigate the biomechanical response of the cervical spine to TCCM. METHODS: The model of a C2-T1 cervical spine was constructed based on CT images of a healthy male volunteer and validated against published in vitro studies under different loading conditions...
June 28, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28650736/test-retest-reliability-of-jump-execution-variables-using-mechanography-a-comparison-of-jump-protocols
#13
John S Fitzgerald, LuAnn Johnson, Grant Tomkinson, Jesse Stein, James N Roemmich
Mechanography during the vertical jump may enhance screening and determining mechanistic causes underlying physical performance changes. Utility of jump mechanography for evaluation is limited by scant test-retest reliability data on force-time variables. This study examined the test-retest reliability of eight jump execution variables assessed from mechanography. Thirty-two women (mean±SD: age 20.8 ± 1.3 yr) and 16 men (age 22.1 ± 1.9 yr) attended a familiarization session and two testing sessions, all one week apart...
June 26, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28644194/phase-characteristics-of-the-countermovement-jump-force-time-curve-a-comparison-of-athletes-by-jumping-ability
#14
Christopher J Sole, Satoshi Mizuguchi, Kimitake Sato, Gavin L Moir, Michael H Stone
The purpose of this study was to compare the phase characteristics of the countermovement jump (CMJ) force time (F-t) curve between athletes based on jumping ability. An initial sample of one-hundred and fifty Division-I collegiate athletes were ranked based on CMJ jump height. Three performance groups were then formed by taking the top, middle, and lower thirty athletes (15 male and 15 female) from the sample. Phases of the CMJ F-t curve were determined and then characterized by their duration, magnitude, area (impulse), and shape (shape factor)...
June 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28639728/prospective-use-of-ablation-index-targets-improves-clinical-outcomes-following-ablation-for-atrial-fibrillation
#15
Ahmed Hussein, Moloy Das, Vivek Chaturvedi, Issa Khalil Asfour, Niji Daryanani, Maureen Morgan, Christina Ronayne, Matthew Shaw, Richard Snowdon, Dhiraj Gupta
AIMS: Late recovery of ablated tissue leading to reconnection of pulmonary veins remains common following radiofrequency catheter ablation for AF. Ablation Index (AI), a novel ablation quality marker, incorporates contact force (CF), time, and power in a weighted formula. We hypothesized that prospective use of our previously published derived AI targets would result in better outcomes when compared to CF-guided ablation. METHODS: Eighty-nine consecutive drug-refractory AF patients (49% paroxysmal) underwent AI-guided ablation (AI-group)...
June 22, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28632407/prediction-of-the-structural-response-of-the-femoral-shaft-under-dynamic-loading-using-subject-specific-finite-element-models
#16
Gwansik Park, Taewung Kim, Jason Forman, Matthew B Panzer, Jeff R Crandall
The goal of this study was to predict the structural response of the femoral shaft under dynamic loading conditions using subject-specific finite element (SS-FE) models and to evaluate the prediction accuracy of the models in relation to the model complexity. In total, SS-FE models of 31 femur specimens were developed. Using those models, dynamic three-point bending and combined loading tests (bending with four different levels of axial compression) of bare femurs were simulated, and the prediction capabilities of five different levels of model complexity were evaluated based on the impact force time histories: baseline, mass-based scaled, structure-based scaled, geometric SS-FE, and heterogenized SS-FE models...
June 20, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28618334/comprehensive-modelling-and-simulation-of-cylindrical-nanoparticles-manipulation-by-using-a-virtual-reality-environment
#17
Moharam Habibnejad Korayem, Ali Kafash Hoshiar, Maedeh Ghofrani
With the expansion of nanotechnology, robots based on atomic force microscope (AFM) have been widely used as effective tools for displacing nanoparticles and constructing nanostructures. One of the most limiting factors in AFM-based manipulation procedures is the inability of simultaneously observing the controlled pushing and displacing of nanoparticles while performing the operation. To deal with this limitation, a virtual reality environment has been used in this paper for observing the manipulation operation...
June 8, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28579576/automated-ablation-annotation-algorithm-reduces-re-conduction-of-isolated-pulmonary-vein-and-improves-outcome-after-catheter-ablation-for-atrial-fibrillation
#18
Nobuaki Tanaka, Koichi Inoue, Koji Tanaka, Yuko Toyoshima, Takafumi Oka, Masato Okada, Hiroyuki Inoue, Ryo Nakamaru, Yasushi Koyama, Atsunori Okamura, Katsuomi Iwakura, Yasushi Sakata, Kenshi Fujii
BACKGROUND: Durable pulmonary vein isolation (PVI) is critical in reducing recurrence after radiofrequency catheter ablation for atrial fibrillation (AF). The VISITAG Module, an automatic annotation system that takes account of catheter stability and contact force (CF), might be useful in accomplishing this.Methods and Results:In 49 patients undergoing VISITAG-guided AF ablation (group A), we set the following automatic annotation criteria: catheter stability range of motion ≤1...
June 2, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28538316/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#19
Timothy J Suchomel, Jason P Lake, Paul Comfort
Suchomel, TJ, Lake, JP, and Comfort, P. Load absorption force-time characteristics following the second pull of weightlifting derivatives. J Strength Cond Res 31(6): 1644-1652, 2017-The purpose of this study was to compare the load absorption force-time characteristics of weightlifting catching and pulling derivatives. Twelve resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform with 30, 45, 65, and 80% of their 1-repetition maximum HPC...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28532279/the-effect-of-cold-ambient-temperatures-on-climbing-specific-finger-flexor-performance
#20
Kevin Phillips, Byungjoo Noh, Matthew Gage, Tejin Yoon
Different ambient temperatures are known to affect muscular performance based on the type of contraction. The effect of cold (10°C) and thermoneutral (TN) (24°C) ambient temperatures on finger flexor performance was examined in 12 rock climbers. After 30 min of seated rest in the designated temperature condition, participants completed maximal voluntary contractions (MVC) on a climbing-specific finger flexor assessment device equipped with a crimp grip hold. Participants then completed an intermittent fatiguing task until failure...
August 2017: European Journal of Sport Science
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