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https://www.readbyqxmd.com/read/29658524/reference-values-of-spatiotemporal-parameters-joint-angles-ground-reaction-forces-and-plantar-pressure-distribution-during-normal-gait-in-young-women
#1
Anna Fryzowicz, Michał Murawa, Jarosław Kabaciński, Agata Rzepnicka, Lechosław B Dworak
PURPOSE: The aim of this study was to establish the reference values of spatiotemporal parameters, joint angles, ground reaction forces and plantar pressure distribution collected simultaneously on the same measurement path during normal gait in a homogenous group of young, healthy women. METHODS: The studied group consisted of 28 healthy women aged 21 years on average. The motion capture system BTS Smart-D, 2 AMTI force platforms and Footscan pedobarographic platform were used in this research...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29618475/novel-measure-of-local-impedance-predicts-catheter-tissue-contact-and-lesion-formation
#2
Matthew S Sulkin, Jacob I Laughner, Sebastian Hilbert, Suraj Kapa, Jedrzej Kosiuk, Paul Younan, Iñaki Romero, Allan Shuros, Jason J Hamann, Gerhard Hindricks, Andreas Bollmann
BACKGROUND: Coupling between the ablation catheter and myocardium is critical to resistively heat tissue with radiofrequency ablation. The objective of this study was to evaluate whether a novel local impedance (LI) measurement on an ablation catheter identifies catheter-tissue coupling and is predictive of lesion formation. METHODS AND RESULTS: LI was studied in explanted hearts (n=10 swine) and in vivo (n=10; 50-70 kg swine) using an investigational electroanatomic mapping system that measures impedance from an ablation catheter with mini-electrodes incorporated in the distal electrode (Rhythmia and IntellaNav MiFi OI, Boston Scientific)...
April 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29602989/an-in-vivo-analysis-of-safe-laparoscopic-grasping-thresholds-for-colorectal-surgery
#3
Jenifer Barrie, Louise Russell, Adrian J Hood, David G Jayne, Anne Neville, Peter R Culmer
BACKGROUND: Analysis of safe laparoscopic grasping thresholds for the colon has not been performed. This study aimed to analyse tissue damage thresholds when the colon is grasped laparoscopically, correlating histological changes to mechanical compressive forces. METHODS: An instrumented laparoscopic grasper was used to measure the forces applied to porcine colon, with data captured and plotted as a force-time (f-t) curve. Haematoxylin and eosin histochemistry of tissue subjected to 10, 20, 40, 50 and 70 N for 5, 30 and 60 s was performed, and the area of colonic circular and longitudinal muscle was compared in grasped and un-grasped regions...
March 30, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29573666/foot-posture-is-associated-with-plantar-pressure-during-gait-a-comparison-of-normal-planus-and-cavus-feet
#4
Andrew K Buldt, Saeed Forghany, Karl B Landorf, Pazit Levinger, George S Murley, Hylton B Menz
BACKGROUND: Variations in foot posture, such as pes planus (low medial longitudinal arch) or pes cavus (high medial longitudinal arch) are associated with some lower limb injuries. However, the mechanism that links foot posture to injury is not clear. Research question The aim of this study was to compare plantar pressure between healthy individuals with normal, planus or cavus feet. METHODS: Ninety-two healthy volunteers (aged 18 to 45) were classified as either normal (n = 35), pes planus (n = 31) or pes cavus (n = 26) based on the Foot Posture Index, Arch Index and normalised navicular height truncated...
March 5, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29570575/evaluation-of-the-most-reliable-procedure-of-determining-jump-height-during-the-loaded-countermovement-jump-exercise-take-off-velocity-vs-flight-time
#5
Alejandro Pérez-Castilla, Amador García-Ramos
This study aimed to compare the reliability of jump height between the two standard procedures of analysing force-time data (take-off velocity [TOV] and flight time [FT]) during the loaded countermovement (CMJ) exercise performed with a free-weight barbell and in a Smith machine. The jump height of 17 men (age: 22.2 ± 2.2 years, body mass: 75.2 ± 7.1 kg, height: 177.0 ± 6.0 cm) was tested in four sessions (twice for each CMJ type) against external loads of 17, 30, 45, 60, and 75 kg. Jump height reliability was comparable between the TOV (coefficient of variation [CV]: 6...
March 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29569574/improved-muscle-activation-using-proximal-nerve-stimulation-with-subthreshold-current-pulses-at-kilohertz-frequency
#6
Yang Zheng, Xiaogang Hu
Transcutaneous electrical nerve stimulation can help individuals with neurological disorders to regain their motor function by activating muscles externally. However, conventional stimulation technique often induces near-simultaneous recruitment of muscle fibers, leading to twitch forces time-locked to the stimulation.
 Approach: To induce less synchronized activation of finger flexor muscles, we delivered clustered narrower pulses to the proximal segment of the median and ulnar nerves at a carrier frequency of either 10 kHz (with an 80 µs pulse width) or 7...
March 23, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29560493/finite-element-based-pelvic-injury-metric-creation-and-validation-in-lateral-impact-for-a-human-body-model
#7
Caitlin Weaver, Alexander Baker, Matthew Davis, Anna Miller, Joel D Stitzel
Pelvic fractures are serious injuries resulting in high mortality and morbidity. The objective of this study is to develop and validate local pelvic anatomical, cross-section-based injury risk metrics for a finite element (FE) model of the human body. Cross-sectional instrumentation was implemented in the pelvic region of the Global Human Body Models Consortium (GHBMC M50-O) 50th percentile detailed male FE model (v4.3). In total, 25 lateral impact FE simulations were performed using input data from cadaveric lateral impact tests performed by Bouquet et al...
February 20, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29524798/the-relationship-between-foot-posture-and-plantar-pressure-during-walking-in-adults-a-systematic-review
#8
REVIEW
Andrew K Buldt, Jamie J Allan, Karl B Landorf, Hylton B Menz
BACKGROUND: Foot posture is a risk factor for some lower limb injuries, however the underlying mechanism is not well understood. Plantar pressure analysis is one technique to investigate the interaction between foot posture and biomechanical function of the lower limb. RESEARCH QUESTION: The aim of this review was to investigate the relationship between foot posture and plantar pressure during walking. METHODS: A systematic database search was conducted using MEDLINE, CINAHL, SPORTDiscus and Embase to identify studies that have assessed the relationship between foot posture and plantar pressure during walking...
February 23, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29514702/correction-to-skeletal-muscle-mechanics-questions-problems-and-possible-solutions
#9
W Herzog
In Fig. 3a of the original manuscript [1], the passive force at the beginning of the force-time history (approximately from 0 to 1 s) of each of the black and orange traces was interchanged in the coloring process. This was an error in the artwork preparation, not the original data. The corrected figure is shown below.
March 7, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29492341/a-simple-method-of-equine-limb-force-vector-analysis-and-its-potential-applications
#10
Sarah Jane Hobbs, Mark A Robinson, Hilary M Clayton
Background: Ground reaction forces (GRF) measured during equine gait analysis are typically evaluated by analyzing discrete values obtained from continuous force-time data for the vertical, longitudinal and transverse GRF components. This paper describes a simple, temporo-spatial method of displaying and analyzing sagittal plane GRF vectors. In addition, the application of statistical parametric mapping (SPM) is introduced to analyse differences between contra-lateral fore and hindlimb force-time curves throughout the stance phase...
2018: PeerJ
https://www.readbyqxmd.com/read/29489716/the-effect-of-barbell-load-on-vertical-jump-landing-force-time-characteristics
#11
Jason P Lake, Peter D Mundy, Paul Comfort, John J McMahon, Timothy J Suchomel, Patrick Carden
The aim of this study was to quantify the effect that barbell load has on the jump height and force-time characteristics of the countermovement jump (CMJ). Fifteen strengthtrained men (mean ± SD: age 23 ± 2 years, mass 84.9 ± 8.1 kg, height 1.80 ± 0.05 m) performed three CMJ with no additional load, and with barbell loads of 25%, 50%, 75%, and 100% of body mass on two force plates recording at 1000 Hz. Propulsion and landing force-time characteristics were obtained from force-time data and compared using analysis of variance and effect sizes...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29466027/effect-of-cold-water-immersion-on-handgrip-performance-in-rock-climbers
#12
Jan Kodejška, Jiří Baláš, Nick Draper
PURPOSE: The aim of this study was to determine the effect of two cold water immersion (CWI) temperatures (15° C and 8° C) on repeat handgrip performance to failure. METHODS: Thirty-two participants completed three intermittent trials to failure on a climbing-specific handgrip dynamometer on three laboratory visits. For each visit a different recovery strategy was employed: passive recovery (PAS), cold water immersion at 8° C (CW8) or 15° C (CW15). The force time integral (FTI - time of contraction multiplied by the force of contraction) was determined to assess handgrip performance...
February 21, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29460232/atrial-fibrillation-ablation-using-very-short-duration-50-w-ablations-and-contact-force-sensing-catheters
#13
Roger A Winkle, Ryan Moskovitz, R Hardwin Mead, Gregory Engel, Melissa H Kong, William Fleming, Jonathan Salcedo, Rob A Patrawala, John H Tranter, Isaac Shai
PURPOSE: The optimal radiofrequency (RF) power and lesion duration using contact force (CF) sensing catheters for atrial fibrillation (AF) ablation are unknown. We evaluate 50 W RF power for very short durations using CF sensing catheters during AF ablation. METHODS: We evaluated 51 patients with paroxysmal (n = 20) or persistent (n = 31) AF undergoing initial RF ablation. RESULTS: A total of 3961 50 W RF lesions were given (average 77...
February 19, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29435790/randomized-controlled-trial-of-amigo%C3%A2-robotically-controlled-versus-manually-controlled-ablation-of-the-cavo-tricuspid-isthmus-using-a-contact-force-ablation-catheter
#14
Kurt S Hoffmayer, Felix Krainski, Sanjay Shah, Jessica Hunter, Maylene Alegre, Jonathan C Hsu, Gregory K Feld
BACKGROUND: Radiofrequency catheter ablation (RFCA) of the cavo-tricuspid isthmus (CTI) is a common treatment for atrial flutter (AFL). However, achieving bi-directional CTI conduction block may be difficult, partly due to catheter instability. OBJECTIVE: To evaluate the safety and efficacy of the Amigo® Remote Catheter System (RCS) compared to manual catheter manipulation, during CTI ablation for AFL. METHODS: Fifty patients (pts) were prospectively randomized to robotically (25 pts) versus manually (25 pts) controlled catheter manipulation during CTI ablation, using a force-contact sensing, irrigated ablation catheter...
February 12, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29427304/police-and-mental-health-responses-to-mental-health-crisis-in-the-waikato-region-of-new-zealand
#15
Graham Holman, Anthony John O'Brien, Katey Thom
New Zealand police report a high level of involvement with people in mental health crisis, something that has been reported in the international literature in recent decades. Involvement of police represents a coercive pathway to care and is likely to be associated with use of force. The aim of this study was to investigate the clinical, legal, and social characteristics of individuals subject to police response in the Waikato region of New Zealand. Data were also collected on characteristics of police response, including use of force, time of day, and disposition...
February 10, 2018: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/29387636/the-time-has-come-to-incorporate-a-greater-focus-on-rate-of-force-development-training-in-the-sports-injury-rehabilitation-process
#16
REVIEW
Matthew Buckthorpe, Giulio Sergio Roi
This narrative and literature review discusses the relevance of Rate of Force Development (RFD) (the slope of the force time curve) for Return To Sport (RTS), its determinants and the influence of training practices on it expression, with the purpose to enhance clinicians' awareness of how RFD training may enhance RTS success. RFD is considered functionally more relevant than maximal muscle strength during certain very fast actions including rapid joint stabilisation following mechanical perturbation. Deficits in RFD are reported following conventional rehabilitation programmes despite full restoration of maximal strength, which may contribute to the less than satisfactory RTS outcomes reported in the literature...
July 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29385000/effect-of-low-pass-filtering-on-isometric-mid-thigh-pull-kinetics
#17
Thomas Dos'Santos, Jason Lake, Paul A Jones, Paul Comfort
The purpose of this study was to investigate the effect of low-pass filtering on isometric mid-thigh pull (IMTP) kinetics, including body weight (BW), onset threshold force, time-specific force values (50, 100, 150 and 200 ms) and peak force (PF). Forty IMTP trials from twenty-four collegiate athletes (age: 21.2 ± 1.8 years, height: 1.72 ± 0.09 m, mass: 79.4 ± 8.2 kg) were analyzed and compared using unfiltered (UF) and low-pass filtered (LPF) (Fourth-order Butterworth) with cut-off frequencies of 10 (LPF10) and 100 (LPF100) Hz...
January 29, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29381394/validation-of-a-booted-finite-element-model-of-the-wiaman-atd-lower-limb-in-component-and-whole-body-vertical-loading-impacts-with-an-assessment-of-the-boot-influence-model-on-response
#18
Wade A Baker, Mostafiz R Chowdhury, Costin Untaroiu
OBJECTIVE: A novel anthropomorphic test device (ATD) representative of the 50th percentile male soldier is being developed to predict injuries to a vehicle occupant during an under-body blast (UBB). The main objective of this study was to develop and validate a finite element (FE) model of the ATD lower limb outfitted with a military combat boot. Secondly, to insert the validated lower-limb into a model of the full ATD and simulate vertical loading experiments. METHODS: A Belleville desert combat boot model was assigned contacts and material properties based on previous experiments...
January 30, 2018: Traffic Injury Prevention
https://www.readbyqxmd.com/read/29378865/saliency-detection-as-a-reactive-process-unexpected-sensory-events-evoke-cortico-muscular-coupling
#19
G Novembre, V M Pawar, R J Bufacchi, M Kilintari, M A Srinivasan, J C Rothwell, P Haggard, G D Iannetti
Survival in a fast-changing environment requires animals not only to detect unexpected sensory events, but also to react. In humans, these salient sensory events generate large electrocortical responses, which have been traditionally interpreted within the sensory domain. Here we describe a basic physiological mechanism coupling saliency-related cortical responses with motor output. In four experiments conducted on 70 healthy participants, we show that salient sub-startle sensory stimuli modulate isometric force exertion by human participants, and that this modulation is tightly coupled with electrocortical activity elicited by the same stimuli...
January 29, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29374967/association-between-second-metatarsal-length-and-forefoot-loading-under-the-second-metatarsophalangeal-joint
#20
Adam E Fleischer, Shenche Hshieh, Ryan T Crews, Brett J Waverly, Jacob M Jones, Erin E Klein, Lowell Weil, Lowell Scott Weil
BACKGROUND: Metatarsal length is believed to play a role in plantar plate dysfunction, although the mechanism through which progressive injury occurs is still uncertain. We aimed to clarify whether length of the second metatarsal was associated with increased plantar pressure measurements in the forefoot while walking. METHODS: Weightbearing radiographs and corresponding pedobarographic data from 100 patients in our practice walking without a limp were retrospectively reviewed...
January 1, 2018: Foot & Ankle International
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