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Journal of Electromyography and Kinesiology

Christian Than, Laura Seidl, Danijel Tosovic, J Mark Brown
This study investigated test-retest reliability of mechanomyography (MMG) on lumbar paraspinal muscles. Healthy male and female subjects (mean ± standard deviation, 25 ± 9.4 years, BMI 21.8 ± 2.99, n = 34) were recruited. Two test sessions (one week apart) consisted of MMG (laser displacement sensor (LDS)) muscle evaluations over the 10 lumbar facet joints, and 2 bilateral sacral sites, in anatomical extension and flexion. Two-way repeated measures ANOVA with Tukey's post hoc showed no significant differences between testing sessions for the same position (p > 0...
May 12, 2018: Journal of Electromyography and Kinesiology
João Pedro Batista, Ligia Maria Facci, Alexandre Roberto Marcondes Pelegrinelli, Sylvie Charlotte Frieda Anneliese von Werder, Daniella Carneiro de Souza, Marcelo Taglietti, Josilainne Marcelino Dias, Catherine Disselhorst-Klug, Jefferson Rosa Cardoso
The aim of the study was to determine the effects of joint angle position and angular velocity on concentric and eccentric knee muscles activity of elderly with osteoarthritis (OA) in a deterministic and probabilistic approach compared to matched controls. Concentric and eccentric muscle activation of vastus medialis (VM) and semitendinous (ST) muscles were recorded of eleven elderly women with knee OA (median (Md (25-75%)) age of 62 years (60-72) and Md of body mass index (BMI) of 26 kg/m2 (24.5-27.2)) and ten controls (Md 65 years (62-69) and Md of BMI 24...
April 27, 2018: Journal of Electromyography and Kinesiology
Katherine Plewa, Ali Samadani, Silvia Orlandi, Tom Chau
Although previous studies have highlighted both similarities and differences between the timing of electromyography (EMG) and mechanomyography (MMG) activities of muscles, there is no method to systematically quantify the temporal alignment between corresponding EMG and MMG signals. We proposed a novel method to determine the level of coincident activity in quasi-periodic MMG and EMG signals. The method optimizes 3 muscle-specific parameters: amplitude threshold, window size and minimum percent of EMG and MMG overlap using a particle swarm optimization algorithm to maximize the agreement (balanced accuracy) between electrical and mechanical muscle activity...
April 26, 2018: Journal of Electromyography and Kinesiology
Talia Alenabi, Rachel Whittaker, Soo Y Kim, Clark R Dickerson
This study aimed to identify optimal sets of maximal voluntary isometric contractions (MVICs) for normalizing EMG data from anterior and posterior regions of the supraspinatus, and superior, middle and inferior regions of the infraspinatus. 31 right-handed young healthy individuals (15 males, 16 females) participated. EMG activity was obtained from two regions of supraspinatus and three regions of infraspinatus muscles via fine wire electrodes. Participants performed 15 MVIC tests against manual resistance...
April 25, 2018: Journal of Electromyography and Kinesiology
Carole Miéville, Séléna Lauzière, Martina Betschart, Sylvie Nadeau, Cyril Duclos
Spontaneous gait is often asymmetrical in individuals post-stroke, despite their ability to walk more symmetrically on demand. Given the sensorimotor deficits in the paretic limb, this asymmetrical gait may facilitate balance maintenance. We used a split-belt walking protocol to alter gait asymmetry and determine the effects on dynamic and postural balance. Twenty individuals post-stroke walked on a split-belt treadmill. In two separate periods, the effects of walking with the non-paretic leg, and then the paretic one, on the faster belt on spatio-temporal symmetry and balance were compared before and after these perturbation periods...
April 24, 2018: Journal of Electromyography and Kinesiology
Agostina Casamento-Moran, Rebecca Fleeman, Yen-Ting Chen, MinHyuk Kwon, Emily J Fox, Basma Yacoubi, Evangelos A Christou
Our ability to control movements is influenced by the developmental status of the neuromuscular system. Consequently, movement control improves from childhood to early adulthood but gradually declines thereafter. However, no study has compared movement accuracy between children and older adults. The purpose of this study was to compare endpoint accuracy during a fast goal-directed movement task in children and older adults. Ten pre-adolescent children (9.7 ± 0.67 yrs) and 19 older adults (71.95 ± 6...
April 24, 2018: Journal of Electromyography and Kinesiology
Charalambos C Charalambous, Jesse C Dean, DeAnna L Adkins, Colleen A Hanlon, Mark G Bowden
The investigation of the corticomotor connectivity (CMC) to leg muscles is an emerging research area, and establishing reliability of measures is critical. This study examined the measurement reliability and the differences between bilateral soleus (SOL) and tibialis anterior (TA) CMC in 21 neurologically intact adults. Using single pulse transcranial magnetic stimulation (TMS), each muscle's CMC was assessed twice (7 ± 2 days apart) during rest and active conditions. CMC was quantified using a standardized battery of eight measures (4/condition): motor threshold during resting (RMT), motor evoked potential amplitude and latency (raw and normalized to height) in both conditions, contralateral silent period (CSP) during active...
April 24, 2018: Journal of Electromyography and Kinesiology
Sidney Grosprêtre, Nicolas Gueugneau, Alain Martin, Romuald Lepers
This study aimed at deciphering the origins of spinal excitability modulation that follows neuromuscular electrical stimulation (NMES). Ten participants (age: 24.6 ± 4.2 years) performed 2 randomized NMES sessions on plantar flexors with frequencies of stimulations of 20 or 100 Hz (pulse width: 1 ms) at 20% of maximal voluntary contraction (MVC). Before and after each session, the posterior tibial nerve was stimulated to record H-reflex of soleus (SOL), gastrocnemius medialis (GM) and gastrocnemius lateralis (GL)...
April 24, 2018: Journal of Electromyography and Kinesiology
Alessandro Del Vecchio, Ilenia Bazzucchi, Francesco Felici
The force developed by the human neuromuscular system can change very rapidly (15-50 ms). When processing EMG signals for inferring neural control strategies, it is therefore necessary to extract estimates from short time intervals. In this study, we investigate the relation between joint torque and estimates of average muscle fibre conduction velocity (MFCV) and amplitude (RMS) from surface EMG signals, when varying the duration of the processing interval. Moreover, we assessed the inter-subject variability in RMS and MFCV estimates...
April 24, 2018: Journal of Electromyography and Kinesiology
Jean-Alexandre Boucher, Richard Preuss, Sharon M Henry, Marilee Nugent, Christian Larivière
BACKGROUND: Low back pain (LBP) has been previously associated with delayed anticipatory postural adjustments (APAs) determined by trunk muscle activation. Lumbar stabilization exercise programs (LSEP) for patients with LBP may restore the trunk neuromuscular control of the lumbar spine, and normalize APAs. This exploratory study aimed at testing the reliability of EMG and kinematics-based postural adjustment measures over an 8-week interval, assessing their sensitivity to LBP status and treatment and examining their relationship with clinical outcomes...
April 22, 2018: Journal of Electromyography and Kinesiology
Robert E Hight, Alwyn T Quarshie, Christopher D Black
INTRODUCTION: This study employed a unique stimulation paradigm which allowed for the simultaneous assessment of voluntary activation levels (VA) via twitch-interpolation, and the evoked V-wave responses of the plantar flexors during submaximal and maximal contractions. Test-retest reliability was also examined. METHODS: Fourteen participants repeated a stimulation protocol over four visits to assess VA and evoked V-wave amplitude across torque levels ranging from 20% to 100% MVC...
April 22, 2018: Journal of Electromyography and Kinesiology
Joshua L Keller, Terry J Housh, Clayton L Camic, Haley C Bergstrom, Doug B Smith, Cory M Smith, Ethan C Hill, Richard J Schmidt, Glen O Johnson, Jorge M Zuniga
The selection of epoch lengths affects the time and frequency resolution of electromyographic (EMG) and mechanomyographic (MMG) signals, as well as decisions regarding the signal processing techniques to use for determining the power density spectrum. No previous studies, however, have examined the effects of epoch length on parameters of the MMG signal. The purpose of this study was to examine the differences between epoch lengths for EMG amplitude, EMG mean power frequency (MPF), MMG amplitude, and MMG MPF from the VL and VM muscles during MVIC muscle actions as well as at each 10% of the time to exhaustion (TTE) during a continuous isometric muscle action of the leg extensors at 50% of MVIC...
April 22, 2018: Journal of Electromyography and Kinesiology
Federico Quinzi, Andrea Bianchetti, Francesco Felici, Paola Sbriccoli
PURPOSE: Although upper limb techniques are largely utilized during karate combat competitions scarce information regarding their NM control is available. This study aims at investigating the effect of karate practice on the NM control of Biceps and Triceps Brachii during isokinetic contractions to enhance current knowledge on neuromuscular control adaptations and training methodologies in combat sports. METHODS: Torque and surface electromyograms (sEMG) of Biceps Brachii Caput Longum (BB) and Triceps Brachii Lateral Head (TB) were recorded in eight karate practitioners (KA) and eight age-matched sedentary individuals (CO) during isokinetic elbow flexion-extensions (0-240°/s-1 )...
April 17, 2018: Journal of Electromyography and Kinesiology
Asim Waris, Imran Khan Niazi, Mohsin Jamil, Omer Gilani, Kevin Englehart, Winnie Jensen, Muhammad Shafique, Ernest Nlandu Kamavuako
While several studies have demonstrated the short-term performance of pattern recognition systems, long-term investigations are very limited. In this study, we investigated changes in classification performance over time. Ten able-bodied individuals and six amputees took part in this study. EMG signals were recorded concurrently from surface and intramuscular electrodes, with intramuscular electrodes kept in the muscles for seven days. Seven hand motions were evaluated daily using linear discriminant analysis and the classification error quantified within (WCE) and between (BCE) days...
April 17, 2018: Journal of Electromyography and Kinesiology
Márk Váczi, Dan Río-Rodríguez, János Négyesi, Miguel Fernández Del Olmo
In the present study we investigated the acute and the delayed changes in corticospinal excitability and in the neuromechanical properties of the quadriceps muscle after maximal intensity stretch-shortening cycle exercise. Ten young males performed 150 jumps to provoke fatigue and muscle damage. Voluntary force, various electrically evoked force variables, and corticospinal excitability were measured at baseline, immediately (IP) and at 24 h post-exercise. Voluntary force, single twitch force, and low frequency force decreased at IP (p < 0...
March 28, 2018: Journal of Electromyography and Kinesiology
David J Green, Kevin Thomas, Emma Z Ross, Steven C Green, Jamie S M Pringle, Glyn Howatson
This study aimed to establish the effect of cycling mode and cadence on torque, external power output, and lower limb muscle activation during maximal, recumbent, isokinetic cycling. After familiarisation, twelve healthy males completed 6 × 10 s of maximal eccentric (ECC) and concentric (CON) cycling at 20, 40, 60, 80, 100, and 120 rpm with five minutes recovery. Vastus lateralis, medial gastrocnemius, rectus femoris, and biceps femoris surface electromyography was recorded throughout. As cadence increased, peak torque linearly decreased during ECC (350-248 N·m) and CON (239-117 N·m) and peak power increased in a parabolic manner...
March 26, 2018: Journal of Electromyography and Kinesiology
Courtney M Butowicz, Julian C Acasio, Christopher L Dearth, Brad D Hendershot
Persons with lower limb amputation (LLA) walk with altered trunk-pelvic motions. The underlying trunk muscle activation patterns associated with these motions may provide insight into neuromuscular control strategies post LLA and the increased incidence of low back pain (LBP). Eight males with unilateral LLA and ten able-bodied controls (CTR) walked over ground at 1.0 m/s, 1.3 m/s, 1.6 m/s, and self-selected speeds. Trunk muscle onsets/offsets were determined from electromyographic activity of bilateral thoracic (TES) and lumbar (LES) erector spinae...
March 26, 2018: Journal of Electromyography and Kinesiology
Federica Ginanneschi, Mauro Mondelli, David Cioncoloni, Alessandro Rossi
Considerable debate exists in the literature about possible anomalies of ulnar nerve at wrist in carpal tunnel syndrome (CTS). We systematically reviewed the literature about electrophysiologic and morphologic changes of ulnar nerve at wrist in CTS. We carried out a comprehensive search using PubMed from 1963 through October 2017. Data were extracted and the quality of the included studies was evaluated. Twenty-eight studies were selected. Seventy-nine percent of the studies report abnormalities of the ulnar nerve conduction...
March 20, 2018: Journal of Electromyography and Kinesiology
Shani Batcir, Hadar Sharon, Guy Shani, Noa Levitsky, Yoav Gimmon, Ilan Kurz, Amir Shapiro, Itshak Melzer
The purpose of this study was to evaluate the inter-observer reliability and agreement of balance recovery responses, step and multiple-steps thresholds, and kinematic parameters of stepping responses. Older and younger adults were exposed to 36 progressively challenging right and left unannounced surface translations during quiet standing. Subjects were instructed to "react naturally". Step threshold and multiple-step threshold were defined as the minimum disturbance magnitude that consistently elicited one and more than one recovery step, respectively...
March 16, 2018: Journal of Electromyography and Kinesiology
Soufien Chikh, Cyril Garnier, Arnaud Faupin, Antonio Pinti, Samuel Boudet, Fairouz Azaiez, Eric Watelain
Arm-trunk coordination during the initiation of displacement in manual wheelchair is a complex task. The objective of this work is to study the arm-trunk coordination by measuring anticipatory and compensatory postural adjustments. Nine healthy subjects participated in the study after being trained in manual wheelchair. They were asked to initiate a displacement in manual wheelchair in three directions (forward vs. left vs. right), with two speeds (spontaneous vs. maximum) and with two initial hand's positions (hands on thighs vs...
March 13, 2018: Journal of Electromyography and Kinesiology
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