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https://www.readbyqxmd.com/read/27909471/contact-force-and-atrial-fibrillation-ablation
#1
REVIEW
Ullah W, Schilling Rj, Wong T
Catheters able to measure the force and vector of contact between the catheter tip and myocardium are now available. Pre-clinical work has established that the degree of contact between the radiofrequency ablation catheter and myocardium correlates with the size of the delivered lesion. Excess contact is associated with steam pops and perforation. Catheter contact varies within the left atrium secondary to factors including respiration, location, atrial rhythm and the trans-septal catheter delivery technology used...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27875498/a-murine-model-of-robotic-training-to-evaluate-skeletal-muscle-recovery-after-injury
#2
Stefano Lai, Alessandro Panarese, Ross Lawrence, Michael L Boninger, Silvestro Micera, Fabrisia Ambrosio
PURPOSE: In vivo studies have suggested that motor exercise can improve muscle regeneration after injury. Nevertheless, pre-clinical investigations still lack reliable tools to monitor motor performance over time and to deliver optimal training protocols to maximize force recovery. Here, we evaluated the utility of a murine robotic platform to (i) detect early impairment and longitudinal recovery after acute skeletal muscle injury and (ii) administer varying intensity training protocols to enhance forelimb motor performance...
November 21, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27871100/biomechanical-response-of-military-booted-and-unbooted-foot-ankle-tibia-from-vertical-loading
#3
Frank A Pintar, Michael B Schlick, Narayan Yoganandan, Liming Voo, Andrew C Merkle, Michael Kleinberger
A new anthropomorphic test device (ATD) is being developed by the US Army to be responsive to vertical loading during a vehicle underbody blast event. To obtain design parameters for the new ATD, a series of non-injurious tests were conducted to derive biofidelity response corridors for the foot-ankle complex under vertical loading. Isolated post mortem human surrogate (PMHS) lower leg specimens were tested with and without military boot and in different initial foot-ankle positions. Instrumentation included a six-axis load cell at the proximal end, three-axis accelerometers at proximal and distal tibia, and calcaneus, and strain gages...
November 2016: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/27821946/relation-between-muscle-fiber-conduction-velocity-and-exerted-dynamic-characteristics-of-muscular-tension-in-patients-with-hemiplegia-caused-by-stroke
#4
Kenichi Murakami, Hiroyuki Fujisawa, Makoto Suzuki, Yoichiro Sato, Kentaro Sakurai, Chie Abe
[Purpose] The aim of this study was to clarify the relationships among muscle fiber conduction velocity, time-force characteristics of muscle force production, and voluntary movement in patients with hemiplegia. [Subjects and Methods] The participants in the present study were 13 patients with hemiplegia. Muscle fiber conduction velocity, deep temperature of muscles and muscle thickness were measured for the tibialis anterior, and a time force curve was obtained from dorsiflexion of the ankle and lower thigh girth (maximum, minimum) for both sides...
October 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27811299/a-general-relationship-links-gait-mechanics-and-running-ground-reaction-forces
#5
Kenneth P Clark, Laurence J Ryan, Peter G Weyand
The relationship between gait mechanics and running ground reaction forces is widely regarded as complex. This viewpoint has evolved primarily via efforts to explain the rising-edge of vertical force-time waveforms observed during slow human running. Existing theoretical models do provide good rising-edge fits, but require more than a dozen input variables to sum the force contributions of four or more vague components of the body's total mass (mb). Here, we hypothesized that the force contributions of two discrete body mass components are sufficient to account for vertical ground reaction force-time waveforms patterns in full [stance foot and shank, m1=0...
November 3, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27749730/a-comparison-of-catch-phase-force-time-characteristics-during-clean-derivatives-from-the-knee
#6
Paul Comfort, Robert Williams, Timothy J Suchomel, Jason P Lake
The aim of this study was to compare load-absorption force-time characteristics of the clean from the knee (CK), power clean from the knee (PCK) and clean pull from the knee (CPK). Ten collegiate athletes (age 27.5 ± 4.2 years; height 180.4 ± 6.7 cm; mass 84.4 ± 7.8 kg), performed three repetitions each of the CK, PCK and CPK with 90% of their 1RM power clean on a force platform. The CK load-absorption duration (0.95 ± 0.35 s) was significantly longer compared to the CPK (0.44 ± 0.15 s; p < 0.001, d = 2...
September 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27688433/contraction-mode-itself-does-not-determine-the-level-of-mtorc1-activity-in-rat-skeletal-muscle
#7
Satoru Ato, Yuhei Makanae, Kohei Kido, Satoshi Fujita
Resistance training with eccentric contraction has been shown to augment muscle hypertrophy more than other contraction modes do (i.e., concentric and isometric contraction). However, the molecular mechanisms involved remain unclear. The purpose of this study was to investigate the effect of muscle contraction mode on mammalian target of rapamycin complex 1 (mTORC1) signaling using a standardized force-time integral (load (weight) × contraction time). Male Sprague-Dawley rats were randomly assigned to three groups: eccentric contraction, concentric contraction, and isometric contraction...
October 2016: Physiological Reports
https://www.readbyqxmd.com/read/27669195/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#8
Timothy J Suchomel, Jason P Lake, Paul Comfort
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 one repetition maximum (1RM) HPC. Load absorption phase duration, mean force, and work were calculated from the force-time data. The HHP produced a significantly longer load absorption phase duration compared to the HPC (p < 0...
September 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27669194/vertical-and-horizontal-impact-force-comparison-during-jump-landings-with-and-without-rotation-in-ncaa-division-1-male-soccer-players
#9
John R Harry, Leland A Barker, John A Mercer, Janet S Dufek
There is a wealth of research on impact force characteristics when landing from a jump. However, there are no data on impact forces during landing from a jump with an airborne rotation about the vertical axis. We examined impact force parameters in the vertical and horizontal axes during vertical jump (VJ) landings and vertical jump landings with a 180-degree rotation (VJR). Twenty-four Division 1 male soccer players performed three VJ and VJR landings on a dual-force platform system. Paired-samples t-tests (α=0...
September 22, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27658963/selected-plantar-pressure-characteristics-associated-with-the-skating-performance-of-national-in-line-speed-skaters
#10
Wen-Lan Wu, Hsiu-Tao Hsu, I-Hua Chu, Feng-Hua Tsai, Jing-Min Liang
In order to help coaches analyse the techniques of professional in-line speed skaters for making the required fine adjustments and corrections in their push-off work, this study analysed the specific plantar pressure characteristics during a 300-m time-trial test. Fourteen elite in-line speed skaters from the national team were recruited in this study. The total completion time of the 300-m time-trial test, duration of each skating phase, and plantar pressure distribution were measured. The correlation between plantar pressure distribution and skating performance was assessed using Pearson correlation analyses...
September 23, 2016: Sports Biomechanics
https://www.readbyqxmd.com/read/27630422/correlations-between-sagittal-plane-kinematics-and-landing-impact-force-during-single-leg-lateral-jump-landings
#11
Junya Aizawa, Shunsuke Ohji, Hideyuki Koga, Tadashi Masuda, Kazuyoshi Yagishita
[Purpose] The correlations of peak vertical ground reaction force and sagittal angles during single-leg lateral jump-landing with noncontact anterior cruciate ligament injury remain unknown. This study aimed to clarify the correlations between kinematics and impact force during lateral jump-landing. [Subjects and Methods] Twenty active males were included in the analysis. A sagittal-view movie camera and force plate were time synchronized. Trunk and lower extremity sagittal angles were measured 100 ms before initial contact and at peak vertical ground reaction force...
August 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27627026/a-novel-approach-for-extracting-viscoelastic-parameters-of-living-cells-through-combination-of-inverse-finite-element-simulation-and-atomic-force-microscopy
#12
Fanan Wei, Haitao Yang, Lianqing Liu, Guangyong Li
Dynamic mechanical behaviour of living cells has been described by viscoelasticity. However, quantitation of the viscoelastic parameters for living cells is far from sophisticated. In this paper, combining inverse finite element (FE) simulation with Atomic Force Microscope characterization, we attempt to develop a new method to evaluate and acquire trustworthy viscoelastic index of living cells. First, influence of the experiment parameters on stress relaxation process is assessed using FE simulation. As suggested by the simulations, cell height has negligible impact on shape of the force-time curve, i...
September 14, 2016: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/27618735/assessing-muscle-strength-asymmetry-via-a-unilateral-stance-isometric-mid-thigh-pull
#13
Thomas Dos'Santos, Christopher Thomas, Paul A Jones, Paul Comfort
PURPOSE: The purpose of this study was to investigate the within-session reliability of bilateral and unilateral stance isometric mid-thigh pull (IMTP) force-time characteristics including peak force (PF), relative PF and impulse at time bands (0-100, 0-200, 0-250 and 0-300 ms); and to compare isometric force-time characteristics between right and left and dominant (D) and non-dominant (ND) limbs. METHODS: Professional male Rugby league and multi-sport collegiate male athletes (n=54, age 23...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27609762/additional-in-series-compliance-reduces-muscle-force-summation-and-alters-the-time-course-of-force-relaxation-during-fixed-end-contractions
#14
Dean L Mayfield, Bradley S Launikonis, Andrew G Cresswell, Glen A Lichtwark
There are high mechanical demands placed on skeletal muscles in movements requiring rapid acceleration of the body or its limbs. Tendons are responsible for transmitting muscle forces, but, because of their elasticity, can manipulate the mechanics of the internal contractile apparatus. Shortening of the contractile apparatus against the stretch of tendon affects force generation according to known mechanical properties; however, the extent to which differences in tendon compliance alter force development in response to a burst of electrical impulses is unclear...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27569722/characteristics-of-cavotricuspid-isthmus-ablation-for-atrial-flutter-guided-by-novel-parameters-using-a-contact-force-catheter
#15
Paul A Gould, Cameron Booth, Kieran Dauber, Kevin Ng, Andrew Claughton, Gerald C Kaye
INTRODUCTION: This study sought to investigate specific contact force (CF) parameters to guide cavotricuspid isthmus (CTI) ablation and compare the outcome with a historical control cohort. METHODS AND RESULTS: Patients (30) undergoing CTI ablation were enrolled prospectively in the Study cohort and compared with a retrospective Control cohort of 30 patients. Ablation in the Study cohort was performed using CF parameters >10 g and <40 g and a Force Time Integral (FTI) of 800 ± 10 g...
August 29, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/27491378/active-recovery-of-the-finger-flexors-enhances-intermittent-handgrip-performance-in-rock-climbers
#16
Jiří Baláš, Michail Michailov, David Giles, Jan Kodejška, Michaela Panáčková, Simon Fryer
This study aimed to (1) evaluate the effect of hand shaking during recovery phases of intermittent testing on the time-force characteristics of performance and muscle oxygenation, and (2) assess inter-individual variability in the time to achieve the target force during intermittent testing in rock climbers. Twenty-two participants undertook three finger flexor endurance tests at 60% of their maximal voluntary contraction until failure. Performances of a sustained contraction and two intermittent contractions, each with different recovery strategies, were analysed by time-force parameters and near-infrared spectroscopy...
October 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27489217/intermuscular-pressure-between-synergistic-muscles-correlates-with-muscle-force
#17
Lars Reinhardt, Tobias Siebert, Kay Leichsenring, Reinhard Blickhan, Markus Böl
The purpose of the study was to examine the relationship between muscle force generated during isometric contractions (i.e. at a constant muscle-tendon unit length) and the intermuscular (between adjacent muscles) pressure in synergistic muscles. Therefore, the pressure at the contact area of the gastrocnemius and plantaris muscle was measured synchronously to the force of the whole calf musculature in the rabbit species Oryctolagus cuniculus Similar results were obtained when using a conductive pressure sensor, or a fibre-optic pressure transducer connected to a water-filled balloon...
August 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27488016/baseline-correction-of-afm-force-curves-in-the-force-time-representation
#18
Susana Moreno-Flores
This note reports on the proper correction of force data acquired with an atomic force microscope (AFM). The force-time representation is hereby used to obtain the correction factors for the overall offset and slope for a single force-time curve, as the initial force, F0  = F(t0 ), and the rate of change in the force per unit of time, dF/dt, respectively. The report shows that a complete set of force data, including the approach, delay and retraction regions, can be simultaneously corrected in the force-time representation by subtracting the line CLt = F0  + dF/dt·t to the experimental data...
August 4, 2016: Microscopy Research and Technique
https://www.readbyqxmd.com/read/27477708/effects-of-running-induced-fatigue-on-plantar-pressure-distribution-in-novice-runners-with-different-foot-types
#19
Mehrdad Anbarian, Hamed Esmaeili
This study aimed to assess the effects of running-induced fatigue on plantar pressure parameters in novice runners with low and high medial longitudinal arch. Plantar pressure data from 42 novice runners (21 with high, and 21 with low arch) were collected before and after running-induced fatigue protocol during running at 3.3m/s along the Footscan(®) platform. Peak plantar pressure, peak force and force-time integral (impulse) were measured in ten anatomical zones. Relative time for foot roll-over phases and medio-lateral force ratio were calculated before and after the fatigue protocol...
July 2016: Gait & Posture
https://www.readbyqxmd.com/read/27465635/effects-of-short-term-free-weight-and-semiblock-periodization-resistance-training-on-metabolic-syndrome
#20
Mark A South, Andrew S Layne, Charles A Stuart, N Travis Triplett, Michael Ramsey, Mary E Howell, William A Sands, Satoshi Mizuguchi, W Guy Hornsby, Ashley A Kavanaugh, Michael H Stone
South, MA, Layne, AS, Stuart, CA, Triplett, NT, Ramsey, MW, Howell, ME, Sands, WA, Mizuguchi, S, Hornsby, WG, Kavanaugh, AA, and Stone, MH. Effects of short-term free-weight and semiblock periodization resistance training on metabolic syndrome. J Strength Cond Res 30(10): 2682-2696, 2016-The effects of short-term resistance training on performance and health variables associated with prolonged sedentary lifestyle and metabolic syndrome (MS) were investigated. Resistance training may alter a number of health-related, physiological, and performance variables...
October 2016: Journal of Strength and Conditioning Research
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