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https://www.readbyqxmd.com/read/28426509/log-transformed-emg-amplitude-power-output-relationship-single-leg-knee-extensor-versus-single-leg-cycle-ergometry
#1
Eric B Noble, Joshua M Pilarski, Harshal K Vora, Jorge M Zuniga, Moh H Malek
Comparing and contrasting motor unit recruitment and activation for the same muscles for multiple versus single-joint exercise may provide a better understanding of neuromuscular fatigue. The purpose of this study, therefore, is to compare the slope and y-intercept terms for the three superficial quadriceps femoris (vastus lateralis, rectus femoris, and vastus medialis) muscles derived from the log-transformed EMG amplitude-power output relationship between the single-leg knee-extensor ergometry and the single-leg cycle ergometry...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28423987/reproducibility-of-upper-leg-emg-frequency-content-during-cycling
#2
Rodrigo Rico Bini, Camila Peter Hoefelmann, Vitor Pereira Costa, Fernando Diefenthaeler
Reproducibility of frequency content from surface electromyography (sEMG) signals has not been assessed and it is unknown if incremental load testing design could affect sEMG in cycling. The goals of this study were to assess the reproducibility of measures from sEMG frequency content between sessions and to compare these frequency components between a ramp and a step incremental cycling test. Eighteen cyclists performed four incremental load cycling tests to exhaustion. Two tests were performed using a step increment (load started at 100 W for 3 min followed by increments of 30 W every 3 min) and two were performed using a ramp increment (load started at 100 W for 1 min followed by increments of 30 W·min(-1))...
April 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28422771/slow-intermuscular-oscillations-are-associated-with-cocontraction-steadiness
#3
Nayef E Ahmar, Minoru Shinohara
PURPOSE: Voluntary muscle contraction often involves low-frequency correlated neural oscillations across muscles, which may degrade steady cocontraction between antagonistic muscles with distinct levels of activation per each muscle (unbalanced cocontraction). The purposes of the study were 1) to determine whether there is an association between the low-frequency correlated EMG oscillations and performance of steady unbalanced cocontraction across individuals and 2) to determine whether a bout of out-of-phase cocontraction practice reduces the in-phase low-frequency correlated neural oscillations and improves the performance of steady unbalanced cocontraction...
April 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28422571/reliability-of-measuring-lower-limb-muscle-emg-activity-ratio-in-activities-of-daily-living-with-electrodes-embedded-in-the-clothing
#4
Dagny Bengs, Ira Jeglinsky, Jukka Surakka, Thomas Hellsten, Joachim Ring, Jyrki Kettunen
CONTEXT: Using technical clothes with electrodes embedded in the clothing makes it possible to record the electrical activity produced by the activity of the skeletal muscles in activities of daily living. OBJECTIVE: The aim of the study was to investigate the reliability of measuring lower-limb left-right electromyography (EMG) activity ratio with smart shorts during stair descent, stair ascent, and repeated unloaded squats among healthy working-aged subjects. METHODS: Seventeen females (mean age 25...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28422520/low-level-laser-therapy-improves-performance-and-reduces-fatigue-in-competitive-cyclists
#5
Fábio J Lanferdini, Rodrigo R Bini, Bruno M Baroni, Kelli D Klein, Felipe P Carpes, Marco A Vaz
Evidence supports that low-level laser therapy (LLLT) minimizes fatigue effects on muscle performance. However, the ideal LLLT dosage to improve athletes' performance during sports activities, such as cycling, is still unclear. Therefore, the goal of this study was to investigate the effects of different LLLT dosages on cyclists' performance in time-to-exhaustion tests. In addition, we looked at the effects of LLLT on the frequency content of the EMG signals to assess fatigue mechanisms. Twenty male competitive cyclists participated in a crossover, randomized, double-blind and placebo-controlled trial...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28419532/electromyography-in-the-assessment-and-therapy-of-lower-urinary-tract-dysfunction-in-adults
#6
REVIEW
Jan Krhut, Roman Zachoval, Peter F W M Rosier, Beth Shelly, Peter Zvara
AIM: To present the teaching module "Electromyography in the assessment and therapy of lower urinary tract dysfunction in adults." This teaching module embodies a presentation, in combination with this manuscript. This manuscript serves as a scientific background review; the evidence base made available on ICS website to summarize current knowledge and recommendations. METHODS: This review has been prepared by a Working Group of The ICS Urodynamics Committee. The methodology used included comprehensive literature review, consensus formation by the members of the Working Group, and review by members of the ICS Urodynamics Committee core panel...
April 18, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28411326/neck-muscle-emg-force-relationship-and-its-reliability-during-isometric-contractions
#7
Riccardo Lo Martire, Kristofer Gladh, Anton Westman, Björn O Äng
BACKGROUND: Susceptible to injury, the neck is subject to scientific investigations, frequently aiming to elucidate possible injury mechanisms via surface electromyography (EMG) by indirectly estimating cervical loads. Accurate estimation requires that the EMG-force relationship is known and that its measurement error is quantified. Hence, this study examined the relationship between EMG and isometric force amplitude of the anterior neck (AN), the upper posterior neck (UPN), and the lower posterior neck (LPN) and then assessed the relationships' test-retest reliability across force-percentiles within and between days...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28408873/neurofeedback-of-slow-cortical-potentials-in-children-with-attention-deficit-hyperactivity-disorder-a-multicenter-randomized-trial-controlling-for-unspecific-effects
#8
Ute Strehl, Pascal Aggensteiner, Daniel Wachtlin, Daniel Brandeis, Björn Albrecht, Maria Arana, Christiane Bach, Tobias Banaschewski, Thorsten Bogen, Andrea Flaig-Röhr, Christine M Freitag, Yvonne Fuchsenberger, Stephanie Gest, Holger Gevensleben, Laura Herde, Sarah Hohmann, Tanja Legenbauer, Anna-Maria Marx, Sabina Millenet, Benjamin Pniewski, Aribert Rothenberger, Christian Ruckes, Sonja Wörz, Martin Holtmann
Background: Neurofeedback (NF) in children with attention-deficit/hyperactivity disorder (ADHD) has been investigated in a series of studies over the last years. Previous studies did not unanimously support NF as a treatment in ADHD. Most studies did not control for unspecific treatment effects and did not demonstrate that self-regulation took place. The present study examined the efficacy of NF in comparison to electromyographic (EMG) feedback to control for unspecific effects of the treatment, and assessed self-regulation of slow cortical potentials (SCPs)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28406945/predicting-3d-lip-shapes-using-facial-surface-emg
#9
Merijn Eskes, Maarten J A van Alphen, Alfons J M Balm, Ludi E Smeele, Dieta Brandsma, Ferdinand van der Heijden
AIM: The aim of this study is to prove that facial surface electromyography (sEMG) conveys sufficient information to predict 3D lip shapes. High sEMG predictive accuracy implies we could train a neural control model for activation of biomechanical models by simultaneously recording sEMG signals and their associated motions. MATERIALS AND METHODS: With a stereo camera set-up, we recorded 3D lip shapes and simultaneously performed sEMG measurements of the facial muscles, applying principal component analysis (PCA) and a modified general regression neural network (GRNN) to link the sEMG measurements to 3D lip shapes...
2017: PloS One
https://www.readbyqxmd.com/read/28403889/muscle-mri-at-the-time-of-questionable-disease-flares-in-juvenile-dermatomyositis-jdm
#10
Rabheh Abdul-Aziz, Chack-Yung Yu, Brent Adler, Sharon Bout-Tabaku, Katherine E Lintner, Melissa Moore-Clingenpeel, Charles H Spencer
BACKGROUND: The course of JDM has improved substantially over the last 70 years with early and aggressive treatments. Yet it remains difficult to detect disease flares as symptoms may be mild; signs of rash and muscle weakness vary widely and are often equivocal; laboratory tests of muscle enzyme levels are often normal; electromyography and muscle biopsy are invasive. Alternative tools are needed to help decide if more aggressive treatment is needed. Our objective is to determine the effectiveness of muscle Magnetic Resonance Imaging (MRI) in detecting JDM flares, and how an MRI affects physician's decision-making regarding treatment...
April 12, 2017: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/28395183/interplay-between-body-stabilisation-and-quadriceps-muscle-activation-capacity
#11
Theodoros M Bampouras, Neil D Reeves, Vasilios Baltzopoulos, Constantinos N Maganaris
The study aimed to distinguish the effect of stabilisation and muscle activation on quadriceps maximal isometric voluntary contraction (MVC) torque generation. Nine subjects performed (a) an MVC with restrained leg and pelvis (Typical MVC), (b) a Typical MVC with handgrip (Handgrip MVC), (c) an MVC focusing on contracting the knee extensors only (Isolated knee extension MVC), and (d) an MVC with unrestrained leg and pelvis (Unrestrained MVC). Torque and activation capacity between conditions were compared with repeated measures ANOVA and dependent t-tests...
March 22, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28394829/electromyographical-comparison-of-muscle-activation-patterns-across-three-commonly-performed-kettlebell-exercises
#12
Brian C Lyons, Jerry J Mayo, W Steve Tucker, Ben Wax, Russell C Hendrix
The purpose of this study was to compare the muscle activation patterns of three different kettlebell (KB) exercises using electromyography (EMG). Fourteen resistance-trained subjects completed a one-arm swing (Swing), one-arm swing style snatch (Snatch), and a one-arm clean (Clean) using a self-selected 8-10 RM load for each exercise. Trial sessions consisted of subjects performing 5 repetitions of each kettlebell exercise. Mean EMG was used to assess the muscle activation of the biceps brachii (BB), anterior deltoid (AD), posterior deltoid (PD), erector spinae (ES), vastus lateralis (VL), biceps femoris (BF), contralateral external oblique (EO), and gluteus maximus (GM) during each lift using surface electrodes...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28390128/masticatory-muscle-activity-evaluation-by-electromyography-in-subjects-with-zygomatic-implants
#13
M de Rossi, M Palinkas, B Lucas, C Santos, M Semprini, L Oliveira, I Regalo, E Bersani, R Miglioranca, S Siéssere, S Regalo
BACKGROUND: Zygomatic implants are an alternative treatment in the rehabilitation of atrophic maxilla to promote stability in the stomatognathic system. The aim of this study was to compare the electromyographic (EMG) activity of masseter and temporalis muscles in controls and in individuals with complete implant-supported dentures anchored in the zygomatic bone. MATERIALS AND METHODS: Fifty-four volunteers of both genders (mean age 52.5 years) were selected and distributed into two groups: Individuals with zygomatic implant (ZIG; n=27) and fully dentate patients (CG; n=27)...
April 8, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28389398/-numb-leg-in-a-cross-fit-athlete-a-case-report
#14
Stephan Esser, Mckennan Thurston, Krishna Nalluri, Aurelio Muzaurieta
Participation in "CrossFit" athletics and Olympic-styled lifting by the general populace has rapidly increased in the last 10 years. Such athletic engagement poses unique, inadequately defined risks to the participant. We describe the case of a 36 y/o male presenting to an outpatient sports medicine clinic with six weeks of numbness and tingling in the lateral right proximal thigh. After thorough examination and EMG testing, he was found to have a lateral femoral cutaneous neuropathy caused by performing supine gluteal bridges with a weighted barbell resting across his anterior thighs...
April 4, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28388231/sex-differences-in-high-school-athletes-knowledge-of-sport-related-concussion-symptoms-and-reporting-behaviors
#15
Jessica Wallace, Tracey Covassin, Erica Beidler
CONTEXT:   Recent researchers have reported that athletes' knowledge of sport-related concussion (SRC) has increased but that athletes still lack knowledge of all the signs and symptoms of SRC. Understanding the signs and symptoms of SRC and the dangers of playing while symptomatic are critical to reporting behaviors in high school athletes. OBJECTIVE:   To examine sex differences in knowledge of SRC symptoms and reasons for not reporting a suspected SRC to an authoritative figure in high school athletes...
April 18, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28373860/advanced-myoelectric-control-for-robotic-hand-assisted-training-outcome-from-a-stroke-patient
#16
Zhiyuan Lu, Kai-Yu Tong, Henry Shin, Sheng Li, Ping Zhou
A hand exoskeleton driven by myoelectric pattern recognition was designed for stroke rehabilitation. It detects and recognizes the user's motion intent based on electromyography (EMG) signals, and then helps the user to accomplish hand motions in real time. The hand exoskeleton can perform six kinds of motions, including the whole hand closing/opening, tripod pinch/opening, and the "gun" sign/opening. A 52-year-old woman, 8 months after stroke, made 20× 2-h visits over 10 weeks to participate in robot-assisted hand training...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28371739/immediate-effects-of-shoes-inducing-ankle-destabilization-around-henke-s-axis-during-challenging-walking-gaits-gait-kinematics-and-peroneal-muscles-activities
#17
Lilian Fautrelle, Alexandre Kubicki, Nicolas Babault, Christos Paizis
Due to its high frequency of occurrence, as well as possible residual symptoms, proper treatment of lateral ankle sprains (LAS) is important. From a physiological point of view, increasing the quantity of electromyographic (EMG) activity in the peroneal muscles will mechanically improve the functional stability of the ankle joint. The present study investigated the immediate effects of an ankle destabilization device (ADD) specifically designed to induce imbalances along the Henke's axis during 3 challenging walking tasks...
March 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28370852/prospective-study-of-the-use-of-intraoperative-neuromonitoring-in-determining-post-operative-energy-requirements-and-physiologic-midline-in-spinal-cord-stimulation
#18
Claire Collison, Julia Prusik, Steven Paniccioli, Michael Briotte, Rachael Grey, Paul Feustel, Julie G Pilitsis
BACKGROUND: Intraoperative neuromonitoring (IONM) through electromyography (EMG) studies has been shown to be a safe, effective way to determine the laterality of the spinal cord and guide electrode placement during spinal cord stimulation (SCS). However, the use of IONM to predict post-operative energy requirements and midline has not been examined and offers a new avenue to streamline programming and device selection. Further, the impact of cerebrospinal fluid (CSF) thickness on intraoperative and post-operative amplitudes is understood but has not been explicitly characterized...
March 28, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28369104/can-activities-of-daily-living-contribute-to-emg-normalization-for-gait-analysis
#19
Aseel Ghazwan, Sarah M Forrest, Cathy A Holt, Gemma M Whatling
This study aims to examine alternative methods of normalization that effectively reflect muscle activity as compared to Maximal Voluntary Contraction (MVC). EMG data recorded from knee flexion-extension muscles in 10 control subjects during the stance phase of the gait cycle were examined by adopting different approaches of normalization: MVC, Mean and Peak Dynamic during gait cycles, (MDM and PDM, respectively), Peak Dynamic during activities of daily living (ADLs), (*PDM), and a combination of ADLs and MVC(**PDM)...
2017: PloS One
https://www.readbyqxmd.com/read/28365432/long-term-outcome-of-brachial-plexus-re-implantation-after-complete-brachial-plexus-avulsion-injury
#20
C Kachramanoglou, T Carlstedt, M Koltzenburg, D Choi
BACKGROUND: Complete brachial plexus avulsion injury is a severe disabling injury due to traction to the brachial plexus. Brachial plexus re-implantation is an emerging surgical technique for the management of complete brachial plexus avulsion injury. OBJECTIVE: We assessed the functional recovery in 15 patients who have undergone brachial plexus re-implantation surgery after complete brachial plexus avulsion injury with clinical examination and electrophysiological testing METHODS: We included all patients that underwent brachial plexus re-implantation in our institution between 1997 and 2010...
March 29, 2017: World Neurosurgery
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