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Journal of Electromyography and Kinesiology

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https://www.readbyqxmd.com/read/28411488/inter-joint-coordination-of-posture-on-a-seesaw-device
#1
Frédéric Noé, Xavier García-Massó, Thierry Paillard
Even though specific adjustments of the multi-joint control of posture have been observed when posture is challenged, multi-joint coordination on a seesaw device has never been accurately assessed. The current study was conducted in order to investigate the multi-joint coordination when subjects were standing on either a seesaw device or on a stable surface, with the eyes open or closed. Eighteen healthy active subjects were recruited. A principal component analysis and a Self-Organizing Maps analysis were performed on the joint angles in order to detect and characterize dominant coordination patterns...
April 8, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28411487/the-relationship-of-corticospinal-excitability-with-pain-motor-performance-and-disability-in-subjects-with-chronic-wrist-hand-pain
#2
René Pelletier, Johanne Higgins, Daniel Bourbonnais
There is a growing body of evidence of changes in corticospinal excitability associated with musculoskeletal disorders, however there is a lack of knowledge of how these changes relate to measures of pain, motor performance and disability. An exploratory study was performed utilizing Transcranial Magnetic Stimulation to investigate differences in corticospinal excitability in the Abductor Pollicis Brevis (APB) between 15 pain-free subjects and 15 subjects with chronic wrist/hand pain and to determine how corticospinal excitability was associated with measures of pain (visual analog scale, AUSCAN™), hand motor performance (isometric and key pinch strength, Purdue Pegboard Test), disability (AUSCAN™), and spinal motoneuronal excitability...
April 7, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28411486/the-effect-of-age-and-knee-osteoarthritis-on-muscle-activation-patterns-and-knee-joint-biomechanics-during-dual-belt-treadmill-gait
#3
Derek Rutherford, Matthew Baker, Ivan Wong, William Stanish
PURPOSE: To compare a group of individuals with moderate medial compartment knee osteoarthritis (OA) to both an age-matched asymptomatic group of older adults and younger adults to determine whether differences in knee joint muscle activation patterns and joint biomechanics exist during gait between these three groups. SCOPE: 20 young adults, 20 older adults, and 40 individuals with moderate knee OA were recruited. Using standardized procedures, surface electromyograms were recorded from the vastus lateralis and medialis, rectus femoris and the medial and lateral hamstrings...
April 7, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28399443/the-effect-of-inspiratory-and-expiratory-loads-on-abdominal-muscle-activity-during-breathing-in-subjects-at-risk-for-the-development-of-chronic-obstructive-pulmonary-disease-and-healthy
#4
António Mesquita Montes, Carlos Crasto, Cristina Argel de Melo, Rita Santos, Susana Pereira, João Paulo Vilas-Boas
The abdominal muscle activity has been shown to be variable in subjects with chronic obstructive pulmonary disease (COPD) when respiratory demand increases and their recruitment pattern may change the mechanics, as well as the work and cost of breathing. The scientific evidence in subjects "at risk" for the development of COPD may be important to understand the natural history of this disease. This study aims to evaluate the effect of inspiratory and expiratory loads on the abdominal muscle activity during breathing in subjects "at risk" for the development of COPD and healthy...
March 31, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28384495/two-degrees-of-freedom-quasi-static-emg-force-at-the-wrist-using-a-minimum-number-of-electrodes
#5
Edward A Clancy, Carlos Martinez-Luna, Marek Wartenberg, Chenyun Dai, Todd R Farrell
Surface electromyogram-controlled powered hand/wrist prostheses return partial upper-limb function to limb-absent persons. Typically, one degree of freedom (DoF) is controlled at a time, with mode switching between DoFs. Recent research has explored using large-channel EMG systems to provide simultaneous, independent and proportional (SIP) control of two joints-but such systems are not practical in current commercial prostheses. Thus, we investigated site selection of a minimum number of conventional EMG electrodes in an EMG-force task, targeting four sites for a two DoF controller...
March 29, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28395183/interplay-between-body-stabilisation-and-quadriceps-muscle-activation-capacity
#6
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/28343885/carpal-tunnel-syndrome-impairs-index-finger-responses-to-unpredictable-perturbations
#7
Emily L Grandy, Kaihua Xiu, Tamara L Marquardt, Chengliu Li, Peter J Evans, Zong-Ming Li
The fine-tuning of digit forces to object properties can be disrupted by carpal tunnel syndrome (CTS). CTS' effects on hand function have mainly been investigated using predictable manipulation tasks; however, unpredictable perturbations are commonly encountered during manual tasks, presenting situations which may be more challenging to CTS patients given their hand impairments. The purpose of this study was to investigate muscle and force responses of the index finger to unpredictable perturbations in patients with CTS...
March 16, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28342367/optimization-of-surface-electrodes-location-for-h-reflex-recordings-in-soleus-muscle
#8
Alberto Botter, Taian M Vieira
The Hoffmann reflex (H reflex) is extensively used to investigate the spinal motor neuron excitability in healthy and pathological subjects. Obtaining a representative and robust amplitude estimation of the H reflex is of marked relevance in clinical as well as in research applications. As for the motor responses, this issue is strictly related to the electrode positioning, especially for large, pinnate muscles such as the triceps surae. In this study we investigated the effect of electrode position on soleus H-reflex amplitude...
March 16, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28388531/stiffness-and-proprioceptive-contributions-of-ankle-braces-and-the-influence-of-localized-muscle-fatigue
#9
Courtney A Webster, Maury A Nussbaum, Michael L Madigan
Ankle braces are a common treatment to reduce ankle sprain recurrence among individuals with chronic ankle instability (CAI). Bracing provides supplemental external joint stiffness and/or improved proprioceptive acuity. The goals of this study were to assess the effects of two ankle braces on joint position sense (JPS) and ankle stiffness, and determine whether bracing effects are reduced with localized muscle fatigue. Measures of JPS and ankle stiffness were obtained from participants with CAI (n=12) for three conditions (no brace, a neoprene wrap brace, and a semi-rigid brace), before and after inducing localized muscle fatigue at the ankle...
March 2, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28314216/fingertip-forces-and-completion-time-for-index-finger-and-thumb-touchscreen-gestures
#10
Deanna S Asakawa, George H Crocker, Adam Schmaltz, Devin L Jindrich
Users actuate touchscreen computers by applying forces with their fingers to the touchscreen, although the amount and direction of the force is unknown. Our aim was to characterize the magnitude, direction and impulse of the force applied during single finger (tapping and sliding in four directions) and two finger gestures (stretch and pinch). Thirteen subjects performed repeated trials of each gesture. Mean(±SD) resultant force was 0.50(0.09)N for tap, 0.79(0.32)N to 1.18(0.47)N for sliding gestures, 1.47(0...
February 24, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28273612/standardised-surface-electromyography-allows-effective-submental-muscles-assessment
#11
Federica Musto, Riccardo Rosati, Chiarella Sforza, Marilisa Toma, Claudia Dellavia
The aims of this pilot study were to evaluate: (i) the reproducibility and variability of an electromyographical protocol developed for the assessment of submental muscles (SM) (ii) to apply the new protocol to maximal teeth clenching, a simple and largely studied static task in order to quantify the relative contribution of submental muscles. In 20 healthy subjects, aged 19-35years, surface electromyography of SM, masseter (MM) and anterior temporalis (TA) muscles was performed during maximal voluntary clenching (MVC) with and without cotton rolls and the pushing of the tongue against the palate...
February 24, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28238519/corrigendum-to-towards-reducing-the-impacts-of-unwanted-movements-on-identification-of-motion-intentions-j-electromyogr-kinesiol-28-2016-90-98
#12
Xiangxin Li, Shixiong Chen, Haoshi Zhang, Oluwarotimi Williams Samuel, Hui Wang, Peng Fang, Xiufeng Zhang, Guanglin Li
No abstract text is available yet for this article.
February 23, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28259003/analysis-of-3d-multi-segment-lumbar-spine-motion-during-gait-and-prone-hip-extension
#13
Nicholas Ryan, Paul Bruno
Modeling the lumbar spine as a single rigid segment does not consider the relative contribution of regional or segmental motion that may occur during a task. The current study used a multi-segment model to measure three-dimensional (3D) upper and lower lumbar spine motion during walking and prone hip extension (PHE). The degree of segmental redundancy during these movements was assessed by calculating the cross-correlation of the segmental angle time series (R0) and the correlation of the segmental ranges of motion (RROM)...
February 22, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28279574/activity-patterns-of-extrinsic-finger-flexors-and-extensors-during-movements-of-instructed-and-non-instructed-fingers
#14
Nathalie van Beek, Dick F Stegeman, Josien C van den Noort, DirkJan H E J Veeger, Huub Maas
The fingers of the human hand cannot be controlled fully independently. This phenomenon may have a neurological as well as a mechanical basis. Despite previous studies, the neuromechanics of finger movements are not fully understood. The aims of this study were (1) to assess the activation and coactivation patterns of finger specific flexor and extensor muscle regions during instructed single finger flexion and (2) to determine the relationship between enslaved finger movements and respective finger muscle activation...
February 21, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28232285/correlation-between-stiffness-and-electromechanical-delay-components-during-muscle-contraction-and-relaxation-before-and-after-static-stretching
#15
Stefano Longo, Emiliano Cè, Susanna Rampichini, Michela Devoto, Massimo Venturelli, Eloisa Limonta, Fabio Esposito
The study was aimed at assessing possible correlations of the electromechanical delay components during muscle contraction (DelayTOT) and relaxation (R-DelayTOT), with muscle-tendon unit (MTU), muscle, and tendon stiffness before and after static stretching (SS). Plantarflexor muscles' maximum voluntary torque (Tmax) was measured in 18 male participants (age 24±3yrs; body mass 76.4±8.9kg; stature 1.78±0.09m; mean±SD). During Tmax, surface electromyogram (EMG), mechanomyogram, and force signals were detected...
February 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28232284/an-entropy-assisted-musculoskeletal-shoulder-model
#16
Xu Xu, Jia-Hua Lin, Raymond W McGorry
Optimization combined with a musculoskeletal shoulder model has been used to estimate mechanical loading of musculoskeletal elements around the shoulder. Traditionally, the objective function is to minimize the summation of the total activities of the muscles with forces, moments, and stability constraints. Such an objective function, however, tends to neglect the antagonist muscle co-contraction. In this study, an objective function including an entropy term is proposed to address muscle co-contractions. A musculoskeletal shoulder model is developed to apply the proposed objective function...
February 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28192717/system-identification-of-velocity-mechanomyogram-measured-with-a-capacitor-microphone-for-muscle-stiffness-estimation
#17
Takanori Uchiyama, Taiki Tomoshige
A mechanomyogram (MMG) measured with a displacement sensor (displacement MMG) can provide a better estimation of longitudinal muscle stiffness than that measured with an acceleration sensor (acceleration MMG), but the displacement MMG cannot provide transverse muscle stiffness. We propose a method to estimate both longitudinal and transverse muscle stiffness from a velocity MMG using a system identification technique. The aims of this study are to show the advantages of the proposed method. The velocity MMG was measured using a capacitor microphone and a differential circuit, and the MMG, evoked by electrical stimulation, of the tibialis anterior muscle was measured five times in seven healthy young male volunteers...
February 1, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28183042/the-effect-of-asymmetrical-body-orientation-during-simulated-forward-falls-on-the-distal-upper-extremity-impact-response-of-healthy-people
#18
Timothy A Burkhart, Evan Brydges, Jennifer Stefanczyk, David M Andrews
The occurrence of distal upper extremity injuries resulting from forward falls (approximately 165,000 per year) has remained relatively constant for over 20years. Previous work has provided valuable insight into fall arrest strategies, but only symmetric falls in body postures that do not represent actual fall scenarios closely have been evaluated. This study quantified the effect of asymmetric loading and body postures on distal upper extremity response to simulated forward falls. Twenty participants were suspended from the Propelled Upper Limb fall ARest Impact System (PULARIS) in different torso and leg postures relative to the ground and to the sagittal plane (0°, 30° and 45°)...
January 27, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28171786/a-comparison-of-gluteus-medius-gluteus-minimus-and-tensor-facia-latae-muscle-activation-during-gait-in-post-menopausal-women-with-and-without-greater-trochanteric-pain-syndrome
#19
Charlotte Ganderton, Tania Pizzari, Tanya Harle, Jill Cook, Adam Semciw
The effect of greater trochanteric pain syndrome (GTPS) on gluteus medius (GMed) and minimus (GMin) activation in post-menopausal women is unknown. The aim of this study was to compare segmental muscle activation and variability of the GMed, GMin and tensor fascia latae (TFL) during gait in post-menopausal women with and without GTPS. Intramuscular electrodes were inserted into segments of GMin (x2) and GMed (x3) and a surface electrode placed on TFL. Ten control participants and 8 with GTPS completed six walking trials...
January 27, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28171785/dynamic-versus-isometric-electromechanical-delay-in-non-fatigued-and-fatigued-muscle-a-combined-electromyographic-mechanomyographic-and-force-approach
#20
Cory M Smith, Terry J Housh, Ethan C Hill, Glen O Johnson, Richard J Schmidt
This study used a combined electromyographic, mechanomyographic, and force approach to identify electromechanical delay (EMD) from the onsets of the electromyographic to force signals (EMDE-F), onsets of the electromyographic to mechanomyogrpahic signals (EMDE-M), and onsets of mechanomyographic to force signals (EMDM-F). The purposes of the current study were to examine: (1) the differences in EMDE-F, EMDE-M, and EMDM-F from the vastus lateralis during maximal, voluntary dynamic (1 repetition maximum [1-RM]) and isometric (maximal voluntary isometric contraction [MVIC]) muscle actions; and (2) the effects of fatigue on EMDE-F, EMDM-F, and EMDE-M...
January 27, 2017: Journal of Electromyography and Kinesiology
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