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Journal of Electromyography and Kinesiology

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https://www.readbyqxmd.com/read/28086163/changes-in-lower-limb-muscle-activity-after-walking-on-a-split-belt-treadmill-in-individuals-post-stroke
#1
Martina Betschart, Séléna Lauzière, Carole Miéville, Bradford J McFadyen, Sylvie Nadeau
BACKGROUND: There is growing evidence that stroke survivors can adapt and improve step length symmetry in the context of split-belt treadmill (SBT) walking. However, less knowledge exists about the strategies involved for such adaptations. This study analyzed lower limb muscle activity in individuals post-stroke related to SBT-induced changes in step length. METHODS: Step length and surface EMG activity of six lower limb muscles were evaluated in individuals post-stroke (n=16) during (adaptation) and after (after-effects) walking at unequal belt speeds...
January 3, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28061379/assessment-of-the-non-gaussianity-and-non-linearity-levels-of-simulated-semg-signals-on-stationary-segments
#2
Noureddine Messaoudi, Raïs El'hadi Bekka, Philippe Ravier, Rachid Harba
The purpose of this paper was to evaluate the effects of the longitudinal single differential (LSD), the longitudinal double differential (LDD) and the normal double differential (NDD) spatial filters, the electrode shape, the inter-electrode distance (IED) on non-Gaussianity and non-linearity levels of simulated surface EMG (sEMG) signals when the maximum voluntary contraction (MVC) varied from 10% to 100% by a step of 10%. The effects of recruitment range thresholds (RR), the firing rate (FR) strategy and the peak firing rate (PFR) of motor units were also considered...
December 25, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28061380/postural-response-characterization-of-standing-humans-to-multi-directional-predictable-and-unpredictable-perturbations-to-the-arm
#3
Ali Forghani, Richard Preuss, Theodore Milner
When the arm of a standing human is perturbed in an unpredictable direction, postural muscles are activated at latencies as short as 50-110ms. While the motion of the body clearly progresses in hand-to-leg sequence, there is no systematic muscle activation sequence from the arm to the leg muscles, suggesting that the activation of the muscles is not likely the result of local stretch reflexes. In fact, the lower limb muscles are activated before the upright posture is significantly disturbed. The short-latency activation amplitude and the activation probability are clearly tuned to the direction of the arm perturbation for both rostral and caudal muscles...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28040567/effects-of-age-and-sex-on-fatigability-and-recovery-from-a-sustained-maximal-isometric-voluntary-contraction
#4
Rima Solianik, Lina Kreivėnaitė, Vytautas Streckis, Dalia Mickevičienė, Albertas Skurvydas
The aim was to assess the effects of sex and age on fatigability and recovery from sustained maximal voluntary contraction (MVC) of the knee extensor muscles. The central (central activation ratio (CAR) and electrical activity amplitude) and peripheral (electrically evoked torque and muscle contractile properties) factors contributing to fatigue and recovery of 24 young adults (12 males) aged 23.2±3.6years and 20 older adults (12 males) aged 70.6±4.4years were compared. The increase in central and peripheral fatigue was greater (p⩽0...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28039769/a-review-of-methods-to-assess-coactivation-in-the-spine
#5
REVIEW
Peter Le, Thomas M Best, Safdar N Khan, Ehud Mendel, William S Marras
Coactivation is an important component for understanding the physiological cost of muscular and spinal loads and their associations with spinal pathology and potentially myofascial pain. However, due to the complex and dynamic nature of most activities of daily living, it can be difficult to capture a quantifiable measure of coactivation. Many methods exist to assess coactivation, but most are limited to two-muscle systems, isometric/complex analyses, or dynamic/uniplanar analyses. Hence, a void exists in that coactivation has not been documented or assessed as a multiple-muscle system under realistic complex dynamic loading...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28039768/analysis-of-three-dimensional-knee-kinematics-during-stair-descent-two-decades-post-acl-rupture-data-revisited-using-statistical-parametric-mapping
#6
Gisela Sole, Todd Pataky, Eva Tengman, Charlotte Häger
Changes in movement patterns following knee injuries have generally used analyses of pre-defined discrete event-related variables, whereas Statistical Parametric Mapping (SPM) assesses continuous data over time. We applied SPM to test differences for knee trajectories during stair descent between participants with past anterior cruciate ligament (ACL) rupture who underwent reconstruction or only physical therapy compared to healthy controls. Three-dimensional knee joint kinematics during stair descent were registered for 31 subjects with ACL reconstruction (ACLR), 36 subjects with ACL rupture managed with physical therapy only (ACLPT) (∼23years post-injury), and 32 uninjured controls...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28039767/static-otolithic-drive-alters-presynaptic-inhibition-in-soleus-motor-pool
#7
Apollonia Fox, David Koceja
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27940411/can-mastication-in-children-with-cerebral-palsy-be-analyzed-by-clinical-observation-dynamic-ultrasound-and-3d-kinematics
#8
L Remijn, B E Groen, R Speyer, J van Limbeek, J A Vermaire, L van den Engel-Hoek, M W G Nijhuis-van der Sanden
The aim of this study was to explore the feasibility of the Mastication Observation and Evaluation (MOE) instrument, dynamic ultrasound and 3D kinematic measurements to describe mastication in children with spastic cerebral palsy and typically developing children. Masticatory movements during five trials of eating a biscuit were assessed in 8 children with cerebral palsy, spastic type (mean age 9.08years) and 14 typically developing children (mean age 9.01years). Differences between trials were tested (t-test) and the mastication of individual children with cerebral palsy was analyzed...
November 29, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28011412/electromyographic-analysis-of-muscle-activation-during-pull-up-variations
#9
James A Dickie, James A Faulkner, Matthew J Barnes, Sally D Lark
This study sought to identify any differences in peak muscle activation (EMGPEAK) or average rectified variable muscle activation (EMGARV) during supinated grip, pronated grip, neutral grip and rope pull-up exercises. Nineteen strength trained males (24.9±5y; 1.78±0.74m; 81.3±11.3kg; 22.7±2.5kgm(-2)) volunteered to participate in the study. Surface electromyography (EMG) was collected from eight shoulder-arm-forearm complex muscles. All muscle activation was expressed as a percentage of maximum voluntary isometric contraction (%MVIC)...
November 28, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27889683/biomechanics-of-simulated-versus-natural-cross-country-sit-skiing
#10
V Rosso, L Gastaldi, W Rapp, S Lindinger, Y Vanlandewijck, V Linnamo
The purpose of this study was to investigate the biomechanics of cross-country sit-skiing in simulated and natural skiing. Thirteen international level athletes participated in a ski ergometer test (simulated conditions) and a test on snow in a ski-tunnel (natural conditions) using their personal sit-ski. Tests in both conditions were performed at individual maximal speed. When comparing the two conditions the main results were: (1) maximal speed in simulated conditions was lower (p<0.05) but correlated well with the natural condition (r=0...
November 11, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27865130/effects-of-fatigue-on-lower-limb-pelvis-and-trunk-kinematics-and-muscle-activation-gender-differences
#11
Giovanna Camparis Lessi, Ana Flávia Dos Santos, Luis Fylipe Batista, Gabriela Clemente de Oliveira, Fábio Viadanna Serrão
BACKGROUND: Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27863284/landing-from-different-heights-biomechanical-and-neuromuscular-strategies-in-trained-gymnasts-and-untrained-prepubescent-girls
#12
Α Christoforidou, D A Patikas, E Bassa, I Paraschos, S Lazaridis, C Christoforidis, C Kotzamanidis
The purpose of this study was to examine the biomechanics of the lower limb, during landing in female prepubertal gymnasts and prepubertal untrained girls, aged 9-12years. Ten healthy participants were included in each group and performed five landings from 20, 40, and 60cm. Kinematics, ground reaction forces (GRF) and electromyogram (EMG) from the lateral gastrocnemius, tibialis anterior, and vastus lateralis are presented. Gymnasts had higher vertical GRF and shorter braking phase during landing. Compared to untrained girls, gymnasts exhibited for all examined drop heights more knee flexion before and at ground contact, but less knee flexion at maximum knee flexion position...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27835831/spatial-distribution-of-surface-emg-on-trapezius-and-lumbar-muscles-of-violin-and-cello-players-in-single-note-playing
#13
Babak Afsharipour, Francesco Petracca, Mauro Gasparini, Roberto Merletti
Musicians activate their muscles in different patterns, depending on their posture, the instrument being played, and their experience level. Bipolar surface electrodes have been used in the past to monitor such activity, but this method is highly sensitive to the location of the electrode pair. In this work, the spatial distribution of surface EMG (sEMG) of the right trapezius and right and left erector spinae muscles were studied in 16 violin players and 11 cello players. Musicians played their instrument one string at a time in sitting position with/without backrest support...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27816845/are-chronic-neck-pain-scapular-dyskinesis-and-altered-scapulothoracic-muscle-activity-interrelated-a-case-control-study-with-surface-and-fine-wire-emg
#14
Birgit Castelein, Ann Cools, Thierry Parlevliet, Barbara Cagnie
OBJECTIVES: The function of the scapula is important in normal neck function and might be disturbed in patients with neck pain. The surrounding muscular system is important for the function of the scapula. To date, it is not clear if patients with idiopathic neck pain show altered activity of these scapulothoracic muscles. Therefore, the objective of this study was to investigate differences in deeper and superficial lying scapulothoracic muscle activity between patients with idiopathic neck pain and healthy controls during arm elevation, and to identify the influence of scapular dyskinesis on muscle activity...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27810649/the-influence-of-digital-filter-type-amplitude-normalisation-method-and-co-contraction-algorithm-on-clinically-relevant-surface-electromyography-data-during-clinical-movement-assessments
#15
Daniel Devaprakash, Gillian J Weir, James J Dunne, Jacqueline A Alderson, Cyril J Donnelly
There is a large and growing body of surface electromyography (sEMG) research using laboratory-specific signal processing procedures (i.e., digital filter type and amplitude normalisation protocols) and data analyses methods (i.e., co-contraction algorithms) to acquire practically meaningful information from these data. As a result, the ability to compare sEMG results between studies is, and continues to be challenging. The aim of this study was to determine if digital filter type, amplitude normalisation method, and co-contraction algorithm could influence the practical or clinical interpretation of processed sEMG data...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27810648/characteristics-of-emg-frequency-bands-in-temporomandibullar-disorders-patients
#16
Fabiano Politti, Claudia Casellato, Marcelo Martins Kalytczak, Marilia Barbosa Santos Garcia, Daniela Aparecida Biasotto-Gonzalez
The aim of the present study was to determine whether any specific frequency bands of surface electromyographic (sEMG) signals are more susceptible to alterations in patients with temporomandibular disorders (TMD), when compared with healthy subjects. Twenty-seven healthy adults (19 women and eight men; mean age: 23±6.68years) and 27 TMD patients (20 women and seven men; mean age: 24±5.89years) voluntarily participated in the experiment. sEMG data were recorded from the right and left masseter muscles (RM and LM) and the right and left anterior temporalis muscles (RT and LT) as the participants performed tests of chewing (CHW) and maximal clenching effort (MCE)...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27770687/the-effects-of-squatting-footwear-on-three-dimensional-lower-limb-and-spine-kinetics
#17
Daniel J Southwell, Shane A Petersen, Tyson A C Beach, Ryan B Graham
Altering footwear worn during performance of the barbell back squat has been shown to change motion patterns, but it is not completely understood how this affects biomechanical loading demands. The primary objective was to compare lower back and extremity net joint moments in 24 experienced weightlifters (12M, 12F) who performed 80% one-repetition maximum back squats under three different footwear conditions (barefoot, running shoes, weightlifting shoes). Results showed that there was a significant main effect of footwear condition on the knee extension moment (p=0...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27770686/cutaneous-silent-period-evoked-in-human-first-dorsal-interosseous-muscle-motor-units-by-laser-stimulation
#18
Mehmet Cemal Kahya, Oğuz Sebik, Kemal S Türker
Painful stimulation of the hand results in an inhibitory response in the hand muscles known as the cutaneous silent period (CSP). In this study, we employed probability- and frequency-based analysis methods to examine the CSP induced by laser stimuli. Subjects were asked to contract their first dorsal interosseous muscle so that selected motor units discharged at a rate of about 8Hz. Laser pulses were delivered to the palm of the hand, and reflex responses were recorded. The stimuli generated CSP in all test subjects...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27768963/the-influence-of-knee-alignment-on-lower-extremity-kinetics-during-squats
#19
Lindsay V Slater, Joseph M Hart
The squat is an assessment of lower extremity alignment during movement, however there is little information regarding altered joint kinetics during poorly performed squats. The purpose of this study was to examine changes in joint kinetics and power from altered knee alignment during a squat. Thirty participants completed squats while displacing the knee medially, anteriorly, and with neutral alignment (control). Sagittal and frontal plane torques at the ankle, knee, and hip were altered in the descending and ascending phase of the squat in both the medial and anterior malaligned squat compared to the control squat...
December 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27741439/experimentally-induced-masseter-pain-changes-masseter-but-not-sternocleidomastoid-muscle-related-activity-during-mastication
#20
Fernanda Pasinato, Clarissa C Santos-Couto-Paz, Jorge Luis Lopes Zeredo, Sergio Bruzadelli Macedo, Eliane C R Corrêa
The aim of this study was to verify the effects of induced masseter-muscle pain on the amplitude of muscle activation, symmetry and coactivation of jaw- and neck-muscles during mastication. Twenty-eight male volunteers, mean age±SD 20.6±2.0years, participated in this study. Surface electromyography of the masseter and sternocleidomastoid (SCM) muscles was performed bilaterally during mastication of a gummy candy before and after injections of monosodium glutamate solution and isotonic saline solution. As a result, we observed a decrease in the amplitude of activation of the masseter muscle on the working side (p=0...
December 2016: Journal of Electromyography and Kinesiology
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