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Journal of Electromyography and Kinesiology

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
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
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
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
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
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
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
Mahboobeh Zabihhosseinian, Michael W R Holmes, Samuel Howarth, Brad Ferguson, Bernadette Murphy
BACKGROUND: Scapular orientation is highly dependent on axioscapular muscle function. This study examined the impact of neck muscle fatigue on scapular and humeral kinematics in participants with and without subclinical neck pain (SCNP) during humeral elevation. METHODS: Ten SCNP and 10 control participants performed three unconstrained trials of dominant arm humeral elevation in the scapular plane to approximately 120 degrees before and after neck extensor muscle fatigue...
February 14, 2017: Journal of Electromyography and Kinesiology
C M Bauer, F M Rast, M J Ernst, A Meichtry, J Kool, S M Rissanen, J H Suni, M Kankaanpää
INTRODUCTION: Changes in movement variability and complexity may reflect an adaptation strategy to fatigue. One unresolved question is whether this adaptation is hampered by the presence of low back pain (LBP). This study investigated if changes in movement variability and complexity after fatigue are influenced by the presence of LBP. It is hypothesised that pain free people and people suffering from LBP differ in their response to fatigue. METHODS: The effect of an isometric endurance test on lumbar movement was tested in 27 pain free participants and 59 participants suffering from LBP...
February 13, 2017: Journal of Electromyography and Kinesiology
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
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
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
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
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
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
Inke Marie Albertsen, Mouna Ghédira, Jean-Michel Gracies, Émilie Hutin
OBJECTIVE: To provide normative postural stability data in young subjects. METHODS: Ninety-six healthy participants (58W, 28±6y) stood on a force plate during 60s. We measured effects of support width (feet apart, FA; feet together, FT), vision (eyes open, EO; closed, EC), and cognitive load (single task, ST; dual tasking, DT) on anteroposterior (AP) and medio-lateral (ML) ranges, area and planar velocity of center of pressure (COP) trajectory. RESULTS: All variables increased with FT (AP range, +15%; ML, +185%; area, +242%; velocity, +50%, p<0...
January 19, 2017: Journal of Electromyography and Kinesiology
Luiz Fernando Approbato Selistre, Stela Márcia Mattiello, Theresa Helissa Nakagawa, Glaucia Helena Gonçalves, Marina Petrella, Richard Keith Jones
PURPOSE: External knee moments are reliable to measure knee load but it does not take into account muscle activity. Considering that muscle co-activation increases compressive forces at the knee joint, identifying relationships between muscle co-activations and knee joint load would complement the investigation of the knee loading in subjects with knee osteoarthritis. The purpose of this study was to identify relationships between muscle co-activation and external knee moments during walking in subjects with medial knee osteoarthritis...
January 18, 2017: Journal of Electromyography and Kinesiology
Leonardo Mendes Leal de Souza, Desirée Barros da Fonseca, Hélio da Veiga Cabral, Liliam Fernandes de Oliveira, Taian Martins Vieira
Recent evidence suggests different regions of the rectus femoris (RF) muscle respond differently to squat exercises. Such differential adaptation may result from neural inputs distributed locally within RF, as previously reported for isometric contractions, walking and in response to fatigue. Here we therefore investigate whether myoelectric activity distributes evenly within RF during squat. Surface electromyograms (EMGs) were sampled proximally and distally from RF with arrays of electrodes, while thirteen healthy volunteers performed 10 consecutive squats with 20% and 40% of their body weight...
January 9, 2017: Journal of Electromyography and Kinesiology
Jaejin Hwang, Gregory G Knapik, Jonathan S Dufour, Thomas M Best, Safdar N Khan, Ehud Mendel, William S Marras
Previous curved muscle models have typically examined their robustness only under simple, single-plane static exertions. In addition, the empirical validation of curved muscle models through an entire lumbar spine has not been fully realized. The objective of this study was to empirically validate a personalized biologically-assisted curved muscle model during complex dynamic exertions. Twelve subjects performed a variety of complex lifting tasks as a function of load weight, load origin, and load height. Both a personalized curved muscle model as well as a straight-line muscle model were used to evaluate the model's fidelity and prediction of three-dimensional spine tissue loads under different lifting conditions...
January 9, 2017: Journal of Electromyography and Kinesiology
Ali Falaki, Xuemei Huang, Mechelle M Lewis, Mark L Latash
BACKGROUND: Postural instability is one of most disabling motor symptoms in Parkinson's disease. Indices of multi-muscle synergies are new measurements of postural stability. OBJECTIVES: We explored the effects of dopamine-replacement drugs on multi-muscle synergies stabilizing center of pressure coordinate and their adjustments prior to a self-triggered perturbation in patients with Parkinson's disease. We hypothesized that both synergy indices and synergy adjustments would be improved on dopaminergic drugs...
April 2017: Journal of Electromyography and Kinesiology
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