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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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: 89 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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/28515113/force-sensing-catheters-during-pediatric-radiofrequency-ablation-the-federation-study
#13
Aarti S Dalal, Hoang H Nguyen, Tammy Bowman, George F Van Hare, Jennifer N Avari Silva
BACKGROUND: Based on data from studies of atrial fibrillation ablations, optimal parameters for the TactiCath (TC; St. Jude Medical, Inc) force-sensing ablation catheter are a contact force of 20 g and a force-time integral of 400 g·s for the creation of transmural lesions. We aimed to evaluate TC in pediatric and congenital heart disease patients undergoing ablation. METHODS AND RESULTS: Comprehensive chart and case reviews were performed from June 2015 to March 2016...
May 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28469741/biomechanical-differences-in-the-sprint-start-between-faster-and-slower-high-level-sprinters
#14
Milan Čoh, Stanislav Peharec, Petar Bačić, Krzyszfof Mackala
The purpose of this study was to examine the kinematic and kinetic differences of the sprint start and first two steps between faster and slower high-level sprinters. Twelve male sprinters were dichotomized according to personal best 60- and 100-m times. Each participant performed five starts under constant conditions. An eight-camera system was used for 3-D kinematic analysis. Dynamic forces at the start were determined with starting blocks mounted on bipedal force plates. Measures of front and rear block total force, front and rear block maximal force, time to front and rear block peak force, total force impulse, total horizontal and vertical impulse, front and rear block force impulse, time of block clearance, block leaving velocity and block leaving acceleration were collected...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28432503/high-voltage-zones-within-the-pulmonary-vein-antra-major-determinants-of-acute-pulmonary-vein-reconnections-after-atrial-fibrillation-ablation
#15
Koichi Nagashima, Ichiro Watanabe, Yasuo Okumura, Kazuki Iso, Keiko Takahashi, Ryuta Watanabe, Masaru Arai, Sayaka Kurokawa, Toshiko Nakai, Kimie Ohkubo, Shunichi Yoda, Atsushi Hirayama
PURPOSE: Recurrence of atrial fibrillation (AF) after pulmonary vein isolation (PVI) is mainly due to PV reconnections. Patient-specific tissue characteristics that may contribute remain unidentified. This study aimed to assess the relationship between the bipolar electrogram voltage amplitudes recorded from the PV-left atrial (LA) junction and acute PV reconnection sites. METHODS: Three-dimensional LA voltage maps created before an extensive encircling PVI in 47 AF patients (31 men; mean age 62 ± 11 years) were examined for an association between the EGM voltage amplitude recorded from the PV-LA junction and acute post-PVI PV reconnections (spontaneous PV reconnections and/or ATP-provoked dormant PV conduction)...
April 21, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28426514/comparison-of-the-hang-high-pull-and-loaded-jump-squat-for-the-development-of-vertical-jump-and-isometric-force-time-characteristics
#16
Dustin J Oranchuk, Tracey L Robinson, Zachary J Switaj, Eric J Drinkwater
Weightlifting movements have high skill demands and require expert coaching. Loaded jumps have a comparably lower skill demand, but may be similarly effective for improving explosive performance. The purpose of this study was to compare vertical jump performance, isometric force, and rate of force development (RFD) following a ten-week intervention employing the hang high-pull (hang-pull) or trap-bar jump squat (jump-squat). Eighteen NCAA Division II swimmers (8 males, 10 females) with at least one year of resistance training experience volunteered to participate...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28419605/radiofrequency-catheter-ablation-of-atrial-fibrillation-electrical-modification-suggesting-transmurality-is-faster-achieved-with-remote-magnetic-catheter-in-comparison-with-contact-force-use
#17
Sok-Sithikun Bun, Anis Ayari, Decebal Gabriel Latcu, Abdelkarim Errahmouni, Nadir Saoudi
BACKGROUND: Remote magnetic navigation (RMN) and contact force (CF) sensing catheters are available technologies for radiofrequency (RF) catheter ablation of atrial fibrillation (AF). Our purpose was to compare time to electrogram (EGM) modification suggesting transmural lesions between RMN and CF-guided AF ablation. METHODS AND RESULTS: A total of 1,008 RF applications were analyzed in 21 patients undergoing RMN (n = 11) or CF-guided ablation (n = 10) for paroxysmal AF...
April 17, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28415068/validity-and-reliability-of-a-portable-isometric-mid-thigh-clean-pull
#18
Lachlan P James, Llion A Roberts, G Gregory Haff, Vincent G Kelly, Emma M Beckman
James, LP, Roberts, LA, Haff, GG, Kelly, VG, and Beckman, EM. Validity and reliability of a portable isometric mid-thigh clean pull. J Strength Cond Res 31(5): 1378-1386, 2017-This study investigated the test-retest reliability and criterion validity of force-time curve variables collected through a portable isometric mid-thigh clean pull (IMTP) device equipped with a single-axial load cell. Fifteen males with ≥6 months of resistance training experience attended two testing sessions. In each session, participants performed an IMTP in 2 separate conditions in a randomized counterbalanced manner...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28381417/determinants-of-acute-and-late-pulmonary-vein-reconnection-in-contact-force-guided-pulmonary-vein-isolation-identifying-the-weakest-link-in-the-ablation-chain
#19
COMPARATIVE STUDY
Milad El Haddad, Philippe Taghji, Thomas Phlips, Michael Wolf, Anthony Demolder, Rajin Choudhury, Sébastien Knecht, Yves Vandekerckhove, Rene Tavernier, Hiroshi Nakagawa, Mattias Duytschaever
BACKGROUND: Pulmonary vein reconnection (PVR) still determines recurrences of atrial fibrillation after contact force (CF)-guided pulmonary vein isolation. We studied whether acute PVR (adenosine and waiting time) and late PVR (at repeat) are explained by incomplete transmurality and contiguity within the deployed radiofrequency circle. METHODS AND RESULTS: We analyzed 42 CF-guided ipsilateral pulmonary vein isolation procedures. For each radiofrequency tag within the circle, we collected data reflecting lesion depth (time of application, power, impedance drop [Δ-Imp], CF, force-time integral [FTI], and ablation index [AI]) and contiguity (automated interlesion distance [ILD])...
April 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28344070/unintentional-force-changes-in-cyclical-tasks-performed-by-an-abundant-system-empirical-observations-and-a-dynamical-model
#20
Sasha Reschechtko, Fariba Hasanbarani, Vladimir M Akulin, Mark L Latash
The study explored unintentional force changes elicited by removing visual feedback during cyclical, two-finger isometric force production tasks. Subjects performed two types of tasks at 1Hz, paced by an auditory metronome. One - Force task - required cyclical changes in total force while maintaining the sharing, defined as relative contribution of a finger to total force. The other task - Share task - required cyclical changes in sharing while keeping total force unchanged. Each trial started under full visual feedback on both force and sharing; subsequently, feedback on the variable that was instructed to stay constant was frozen, and finally feedback on the other variable was also removed...
May 14, 2017: Neuroscience
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