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Journal of Electromyography and Kinesiology

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https://www.readbyqxmd.com/read/28735104/effect-of-limb-dominance-and-sex-on-neuromuscular-activation-patterns-in-athletes-under-12-performing-unanticipated-side-cuts
#1
Michael J Del Bel, Alana K Fairfax, Michelle L Jones, Kendal Steele, Scott C Landry
Non-contact ACL injuries are one of the most common injuries to the knee joint among adolescent/collegiate athletes, with sex and limb dominance being identified as risk factors. In children under 12years of age (U12), these injuries occur less often and there is no sex-bias present. This study set out to explore if sex and/or limb dominance differences exist in neuromuscular activations in U12 athletes. Thirty-four U12 males and females had six bilateral muscles analyzed during unanticipated side-cuts. Principal component analysis was performed, capturing differences in overall magnitudes and timing of peak magnitudes...
July 14, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28735103/voluntary-activation-of-the-trapezius-muscle-in-cases-with-neck-shoulder-pain-compared-to-healthy-controls
#2
Katrine Tholstrup Bech, Camilla Marie Larsen, Gisela Sjøgaard, Andreas Holtermann, Janet L Taylor, Karen Søgaard
Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study...
July 14, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28735102/intra-operatively-measured-spastic-semimembranosus-forces-of-children-with-cerebral-palsy
#3
Can A Yucesoy, Yener Temelli, Filiz Ateş
The knee kept forcibly in a flexed position is typical in cerebral palsy. Using a benchmark, we investigate intra-operatively if peak spastic hamstring force is measured in flexed knee positions. This tests the assumed shift of optimal length due to adaptation of spastic muscle and a decreasing force trend towards extension. Previously we measured spastic gracilis (GRA) and semitendinosus (ST) forces. Presently, we studied spastic semimembranosus (SM) and tested the following hypotheses: spastic SM forces are (1) high in flexed and (2) low in extended positions...
July 12, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28719820/intrarater-reliability-and-agreement-of-linear-encoder-derived-heel-rise-endurance-test-outcome-measures-in-healthy-adults
#4
Christopher Byrne, David J Keene, Sarah E Lamb, Keith Willett
A linear encoder measuring vertical displacement during the heel-rise endurance test (HRET) enables the assessment of work and maximum height in addition to the traditional repetitions measure. We aimed to compare the test-retest reliability and agreement of these three outcome measures. Thirty-eight healthy participants (20 females, 18 males) performed the HRET on two occasions separated by a minimum of seven days. Reliability was assessed by the intraclass correlation coefficient (ICC) and agreement by a range of measures including the standard error of measurement (SEM), coefficient of variation (CV), and 95% limits of agreement (LoA)...
July 12, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28734171/muscle-synergies-reveal-impaired-trunk-muscle-coordination-strategies-in-individuals-with-thoracic-spinal-cord-injury
#5
Matija Milosevic, Hikaru Yokoyama, Murielle Grangeon, Kei Masani, Milos R Popovic, Kimitaka Nakazawa, Dany H Gagnon
Spinal cord injury (SCI) can result in paralysis of trunk muscles, which can affect sitting balance. The objective of this study was to analyze trunk muscle coordination of individuals with thoracic SCI and compare it to able-body individuals. A total of 27 individuals were recruited and subdivided into: (a) high thoracic SCI; (b) low thoracic SCI; and (c) able-body groups. Participants were seated and asked to lean their trunk in eight directions while trunk muscle activity was recorded. Muscle coordination was assessed using the non-negative matrix factorization (NMF) method to extract muscle modules, which are the synergistic trunk muscle activations, and their directional activation patterns...
July 1, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28688293/a-new-parameter-for-quantifying-the-variability-of-surface-electromyographic-signals-during-gait-the-occurrence-frequency
#6
Francesco Di Nardo, Alessandro Mengarelli, Annachiara Strazza, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti
Natural variability of myoelectric activity during walking was recently analyzed considering hundreds of strides. This allowed assessing a parameter seldom considered in classic surface EMG (sEMG) studies: the occurrence frequency, defined as the frequency each muscle activation occurs with, quantified by the number of strides when a muscle is recruited with that specific activation modality. Aim of present study was to propose the occurrence frequency as a new parameter for assessing sEMG-signal variability during walking...
June 30, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28662461/standing-on-wedges-modifies-side-specific-postural-control-in-the-presence-of-lateral-external-perturbations
#7
Yun-Ju Lee, Jing-Nong Liang, Bing Chen, Mohan Ganesan, Alexander S Aruin
Standing on wedges changes the position in the ankle joints and affects postural stability in the medial-lateral direction. The objective of the study was to investigate the role of wedges and external lateral perturbations on anticipatory (APA) and compensatory postural adjustments (CPA). Ten healthy young participants were exposed to perturbations applied to the lateral part of their right shoulder when standing on a planar surface, on a medial or lateral wedges. Bilateral electromyographic activity of dorsal and ventral postural muscles and the center of pressure (COP) displacement were recorded and analyzed during the APA and CPA phases...
June 20, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28633066/an-emg-assisted-modeling-approach-to-assess-passive-lumbar-tissue-loading-in-vivo-during-trunk-bending
#8
Xiaopeng Ning
Lower back pain (LBP) is a condition with high prevalence and high cost both in the United States and around the world. The magnitude of mechanical loading on spine is strongly associated with the occurrence of LBP. Previously, to assess spinal loading, biologically assisted biomechanical models were developed to estimate trunk muscle contraction forces. Loadings on lumbar passive tissues are estimated using anatomical models. However, despite the substantial individual variability in lumbar ligament geometry and viscoelastic properties, the existing anatomical models do not account for these differences...
June 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28649011/comparison-of-techniques-to-determine-human-skeletal-muscle-voluntary-activation
#9
Anastasia Zarkou, Scott Stackhouse, Stuart A Binder-Macleod, Samuel C K Lee
Determining volitional activation (VA) can provide insights on the cause of muscle weakness in orthopedic and neurological populations. Two electrical stimulation techniques are traditionally used to quantify VA: interpolation (IT) and superimposition (CAR). IT allows for a more accurate VA estimation, however it requires individuals to be stimulated twice, compared to once for CAR, and thus increases stimulation associated discomfort. To date, there is no agreement on what is the best practical technique for calculating quadriceps VA...
June 8, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28641171/electromyographic-analysis-of-rotator-cuff-muscles-in-patients-with-rotator-cuff-tendinopathy-a-systematic-review
#10
REVIEW
Fábio Carlos Lucas de Oliveira, Laurent Julien Bouyer, Amanda L Ager, Jean-Sébastien Roy
The shoulder is inherently an unstable joint which heavily relies on the neuromuscular activation of the rotator cuff (RC) complex for stability during movement. Currently, there is no consensus regarding how the activity of RC muscles is affected among individuals with a RC tendinopathy (RCTe). This study reviewed the evidence of studies comparing the electromyographic (EMG) activity of any RC muscle of shoulders with a symptomatic RCTe to asymptomatic shoulders. Eight databases were searched. Data from 343 participants (201 symptomatic and 209 asymptomatic shoulders) were analyzed from 10 out of 402 included studies...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28624688/relation-between-peak-power-output-in-sprint-cycling-and-maximum-voluntary-isometric-torque-production
#11
Mehdi Kordi, Stuart Goodall, Paul Barratt, Nicola Rowley, Jonathan Leeder, Glyn Howatson
From a cycling paradigm, little has been done to understand the relationships between maximal isometric strength of different single joint lower body muscle groups and their relation with, and ability to predict PPO and how they compare to an isometric cycling specific task. The aim of this study was to establish relationships between maximal voluntary torque production from isometric single-joint and cycling specific tasks and assess their ability to predict PPO. Twenty male trained cyclists participated in this study...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28624687/estimation-of-distal-arm-joint-angles-from-emg-and-shoulder-orientation-for-transhumeral-prostheses
#12
Aadeel Akhtar, Navid Aghasadeghi, Levi Hargrove, Timothy Bretl
In this paper, we quantify the extent to which shoulder orientation, upper-arm electromyography (EMG), and forearm EMG are predictors of distal arm joint angles during reaching in eight subjects without disability as well as three subjects with a unilateral transhumeral amputation and targeted reinnervation. Prior studies have shown that shoulder orientation and upper-arm EMG, taken separately, are predictors of both elbow flexion/extension and forearm pronation/supination. We show that, for eight subjects without disability, shoulder orientation and upper-arm EMG together are a significantly better predictor of both elbow flexion/extension during unilateral (R(2)=0...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28623713/indirect-sinusoidal-vibrations-induces-an-acute-increase-in-explosive-strength
#13
Leandro V de Paula, Pedro V S Moreira, Rudolf Huebner, Leszek A Szmuchrowski
The purpose of this study was to examine the acute effect of indirect vibration on neuromuscular responses and fatigue resistance (electromyographic activity - EMG and force) during isometric exercise. Nineteen healthy men (age=22.4±2.7years; body mass=76.4±12.9kg, height=175±6.7cm) performed isometric elbow flexion exercises in three experimental treatments: only isometric exercise (control - CON); isometric exercise with the addition of sinusoidal vibrations (SVE1; frequency=20Hz, displacement=3.55±0...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28601565/gait-analysis-of-young-male-patients-diagnosed-with-primary-bladder-neck-obstruction
#14
Matteo Zago, Tommaso Ciro Camerota, Stefano Pisu, Daniela Ciprandi, Chiarella Sforza
Primary bladder neck obstruction (PBNO) represents an inappropriate or inadequate relaxation of the bladder neck during micturition. Based on the observation of an increased rate of postural imbalances in male patients with PBNO, we hypothesized a possible role of an unbalanced biomechanics of the pelvis on urethral sphincters activity. Our aim was to identify kinematic imbalances, usually disregarded in PBNO patients, and which could eventually be involved in the etiopathogenesis of the disease. Seven male adult patients (39...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28601564/angle-of-gaze-and-optic-flow-direction-modulate-body-sway
#15
Milena Raffi, Alessandro Piras, Michela Persiani, Monica Perazzolo, Salvatore Squatrito
Optic flow is a crucial signal in maintaining postural stability. We sought to investigate whether the activity of postural muscles and body sway was modulated by eye position during the view of radial optic flow stimuli. We manipulated the spatial distribution of dot speed and the fixation point position to simulate specific heading directions combined with different gaze positions. The experiments were performed using stabilometry and surface electromyography (EMG) on 24 right-handed young, healthy volunteers...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28595163/a-new-method-for-the-localization-of-the-innervation-zone-based-on-monopolar-surface-detected-potentials
#16
Javier Rodriguez-Falces
In monopolar electrode configuration, the shape of the motor unit potential (MUP) undergoes essential morphologic changes with increasing distance from the innervation zone. In particular, the rising phase of the MUP slows down and becomes longer as the electrode is moved further from the innervation zone. Based on this, it is hypothesized that the maximum slope of the rising phase of a monopolar MUP (SlopeMAX) would reach its highest value at the innervation zone. Herein, we sought to determine whether the location of the innervation zone coincides with the position in the muscle of the monopolar MUP with highest SlopeMAX and whether new criteria for the localization of the innervation region can be proposed based on the SlopeMAX of monopolar potentials...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28595162/rotator-cuff-tendinopathy-alters-the-muscle-activity-onset-and-kinematics-of-scapula
#17
Hio Teng Leong, Gabriel Yin-Fat Ng, Shing Chung Chan, Siu Ngor Fu
Athletes with rotator cuff (RC) tendinopathy demonstrate an aberrant pattern of scapular motion which might relate to deficits in the scapular muscles. This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28591642/effects-of-amplitude-and-predictability-of-perturbations-to-the-arm-on-anticipatory-and-reactionary-muscle-responses-to-maintain-balance
#18
Ali Forghani, Richard Preuss, Theodore Edgar Milner
Disturbances to balance arising from forces applied to the upper limb have received relatively little attention compared to disturbances arising from support surface perturbations. In this study we applied fast ramp perturbations to the hand in anterior, posterior, medial and lateral directions. The effects of perturbation predictability and amplitude on the postural response of upper limb, trunk and lower limb muscles were investigated. Perturbations were applied either in blocks of constant amplitude and direction (predictable) or with direction and amplitude varying randomly (random) from trial to trial...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28587934/ankle-and-knee-biomechanics-during-normal-walking-following-ankle-plantarflexor-fatigue
#19
Michael A Hunt, Gillian L Hatfield
The purpose of this study was to investigate the immediate effects of unilateral ankle plantarflexor fatigue on bilateral knee and ankle biomechanics during gait. Lower leg kinematics, kinetics, and muscle activation were assessed before and after an ankle plantarflexor fatiguing protocol in 31 healthy individuals. Fatigue (defined as >10% reduction in maximal isometric ankle plantarflexor torque production and a downward shift in the median power frequency of both heads of the gastrocnemius muscle of the fatigued limb) was achieved in 18 individuals, and only their data were used for analysis purposes...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28554150/effect-of-valgus-knee-alignment-on-gait-biomechanics-in-healthy-women
#20
Matthew C Hoch, Joshua T Weinhandl
The purpose of this study was to compare lower extremity kinematics and kinetics between women with greater or lesser degrees of valgus knee alignment during gait. Nine women with greater valgus knee alignment (11.9±1.6°) were compared to nine women with lesser valgus knee alignment (6.6±2.4°). Participants completed a biomechanical assessment of overground walking for the right limb. Dependent variables included sagittal and frontal plane joint angles and moments for the hip, knee, and ankle at peak vertical ground reaction force, along with knee abduction angular impulse...
August 2017: Journal of Electromyography and Kinesiology
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