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Journal of Electromyography and Kinesiology

E Ferrari, G Cooper, N D Reeves, E F Hodson-Tole
Intrinsic foot muscles (IFM) are a crucial component within the human foot. Investigating their functioning can help understand healthy and pathological behaviour of foot and ankle, fundamental for everyday activities. Recording muscle activation from IFM has been attempted with invasive techniques, mainly investigating single muscles. Here we present a novel methodology, to investigate the feasibility of recording physiological surface EMG (sEMG) non-invasively and quantify patterns of activation across the whole plantar region of the foot...
February 27, 2018: Journal of Electromyography and Kinesiology
Aïda M Valevicius, Peter Y Jun, Jacqueline S Hebert, Albert H Vette
Quantifying three-dimensional upper body kinematics can be a valuable method for assessing upper limb function. Considering that kinematic model characteristics, performed tasks, and reported outcomes are not consistently standardized and exhibit significant variability across studies, the purpose of this review was to evaluate the literature investigating upper body kinematics in non-disabled individuals via optical motion capture. Specific objectives were to report on the kinematic model characteristics, performed functional tasks, and kinematic outcomes, and to assess whether kinematic protocols were assessed for validity and reliability...
February 23, 2018: Journal of Electromyography and Kinesiology
Sunwook Kim, Maury A Nussbaum, Sophia Ulman
Use of a head-worn display (HWD) may affect gait performance and increase slip and trip risks, though there is a lack of information on such effects. This study investigated how different display technologies (monocular and binocular HWDs, and a paper list) and visual information presentation modes affect gait performance. Twelve gender-balanced participants completed walking and obstacle crossing trials on a linear walking track under all experimental conditions and a baseline control (without using a technology)...
February 23, 2018: Journal of Electromyography and Kinesiology
Tadanobu Suehiro, Hiroshi Ishida, Kenichi Kobara, Hiroshi Osaka, Susumu Watanabe
Changes in the recruitment pattern of trunk muscles may contribute to the development of recurrent or chronic symptoms in people with low back pain (LBP). However, the recruitment pattern of trunk muscles during lifting tasks associated with a high risk of LBP has not been clearly determined in recurrent LBP. The present study aimed to investigate potential differences in trunk muscles recruitment patterns between individuals with recurrent LBP and asymptomatic individuals during lifting. The subjects were 25 individuals with recurrent LBP and 20 asymptomatic individuals...
February 21, 2018: Journal of Electromyography and Kinesiology
Jackie D Zehr, Samuel J Howarth, Tyson A C Beach
Low-back disorder risk can be modulated by pelvis-thorax coordination when lifting. To objectively discriminate between coordination patterns during lifting, the analytical methods used require evaluation. The primary study objective was to determine if continuous relative phase (CRP) and vector coding (VC) analyses can discriminate between lifting techniques that differ based on biomechanical risk criteria. The secondary objective was to determine if normalization/transformation of input segmental angular position and velocity data is required to discriminate between lifting techniques...
February 16, 2018: Journal of Electromyography and Kinesiology
F Sammali, L Xu, C Rabotti, M Cardinale, Y Xu, J P van Dijk, M J Zwarts, Z Del Prete, M Mischi
Vibration exercise (VE) has been suggested as an effective training for improving muscle strength and coordination. However, the underlying physiological adaptation processes are not yet fully understood, limiting the development of safe and effective exercise protocols. To better understand the neuromuscular responses elicited by VE, we aimed at investigating the acute effects of superimposed vibration on the Hoffmann reflex (H-reflex), measured after fatiguing exercise. Twenty-five volunteers performed four isometric contractions of the right Flexor Carpi Radialis (FCR) with baseline load at 80% of their maximal voluntary contraction (MVC), both with no vibration and with superimposed vibration at 15, 30, and 45 Hz...
February 15, 2018: Journal of Electromyography and Kinesiology
Kazuki Fujita, Hiroichi Miaki, Akira Fujimoto, Hideaki Hori, Hitomi Fujimoto, Yasutaka Kobayashi
In hemiparetic stroke survivors, premature plantarflexor muscle activity (PPF) often appears as a gait abnormality from terminal swing to the loading response on the paretic side. This study aimed to discern factors giving rise to PPF. Lower extremity function, spasticity magnitude, and gait electromyograms were assessed in 31 hemiparetic stroke survivors. Mean amplitudes during gait phases were determined for the paretic soleus, tibialis anterior, rectus femoris, and biceps femoris. The subjects were classified into PPF and non-PPF groups based on their relative soleus amplitude at different phases of gait, and group differences in each measurement were calculated and subjected to logistic regression...
February 14, 2018: Journal of Electromyography and Kinesiology
Monika Nojszewska, Malgorzata Gawel, Biruta Kierdaszuk, Janusz Sierdziński, Elżbieta Szmidt-Sałkowska, Andrzej Seroka, Anna M Kamińska, Anna Kostera-Pruszczyk
INTRODUCTION: Clinically oriented diagnostic criteria can be as specific for diagnosis of sporadic inclusion body myositis (sIBM) as pathological criteria, especially at the time of presentation. EMG may provide an convincing proof that a muscle biopsy should be performed. AIMS: To compare the EMG results in patients with sIBM divided into subgroups based on the newest ENMC criteria for sIBM and to obtain the utility of EMG in the diagnostic process at the time of presentation...
February 11, 2018: Journal of Electromyography and Kinesiology
Panagiotis Zis, Marios Hadjivassiliou, Dasappaiah Ganesh Rao
BACKGROUND: Axillary nerve lesions can commonly occur secondary to trauma or brachial plexopathy. Our aim was to describe our technique of axillary nerve motor conduction studies and provide the respective normal values. METHODS: Active electrode was positioned over the most prominent portion of the middle deltoid, approximately 5-7 cm distal to the acromion. Reference electrode was positioned over the acromion. Ground electrode was placed between the active and the reference electrodes...
February 10, 2018: Journal of Electromyography and Kinesiology
Alessandro Piras, Milena Raffi, Monica Perazzolo, Salvatore Squatrito
The optic flow visual input directly influences the postural control. The aim of the present study was to examine the relationship between visually induced heading perception and postural stability, using optic flow stimulation. The dots were accelerated to simulate a heading direction to the left or to the right of the vertical midline. The participants were instructed to indicate the perceived optic flow direction by making a saccade to the simulated heading direction. We simultaneously acquired electromyographyc and center of pressure (COP) signals...
February 10, 2018: Journal of Electromyography and Kinesiology
Minki Sin, Won-Seok Kim, Kyujin Cho, Sungmin Cho, Nam-Jong Paik
The conventional tools to measure spasticity exhibited insufficient test-retest or inter-rater reliability. Therefore, the spasticity measurement using an isokinetic device has been proposed to improve these reliabilities of the angle of catch (AoC) measurements; however, this proposal has not been investigated in a standardized manner. In this study, the comparison of the AoC measurement was performed using two modes (isokinetic and manual motion) to investigate whether the standardized isokinetic motion could increase the reliabilities...
February 3, 2018: Journal of Electromyography and Kinesiology
Eftychia Trachani, Aspasia Rigopoulou, Dimitra Veltsista, Evangelia Gavanozi, Athina Chrysanthopoulou, Elisabeth Chroni
We investigated the possible association between median nerve morphology and carpal tunnel size, hand side and nerve conduction measurements. The study included a patient group (n = 58; 44 women) with idiopathic carpal tunnel syndrome (CTS) in 100 hands and a control group of healthy volunteers (n = 56, 112 hands; 44 women). The following data were recorded: (1) median and ulnar motor and sensory nerve conduction parameters (2) ultrasonographic dimensions of the carpal tunnel inlet area (CTAin) and inlet area of the median nerve...
February 3, 2018: Journal of Electromyography and Kinesiology
Bara Alsalaheen, Ryan Bean, Andrea Almeida, James Eckner, Matthew Lorincz
BACKGROUND: The majority of studies examining the role of cervical muscles on head-neck kinematics focused on musculoskeletal attributes (e.g. strength). Cervical neuromuscular response to perturbation may represent a divergent construct that has not been examined under various perturbation conditions. This study examined the association between cervical musculoskeletal attributes and cervical neuromuscular response of the sternocleidomastoid (SCM) to perturbation. Furthermore, this study examined the effect of anticipation and preload on the SCM neuromuscular response...
February 2, 2018: Journal of Electromyography and Kinesiology
Shane Koppenhaver, Joshua Kniss, Daniel Lilley, Michael Oates, Cesar Fernández-de-Las-Peñas, Ruth Maher, Theodore Croy, Minoru Shinohara
Patients with low back pain commonly exhibit impaired morphology and function of spinal musculature that may be quantifiable using shear-wave elastography (SWE). The purpose of this study was to assess the intra-rater and test-retest reliability of SWE elasticity measures of the lumbar erector spinae and multifidus muscles during rest and differing levels of contraction in asymptomatic individuals. This single-group repeated-measures design involved a baseline measurement session and a follow-up session 3 days later...
February 2, 2018: Journal of Electromyography and Kinesiology
Alison Schinkel-Ivy, Carolyn A Duncan
While reactive balance control in response to single perturbations in quiet standing is relatively well understood, some occupational environments (e.g. maritime environments) expose workers to continuous, multi-directional challenges to balance and postural control, which require workers to respond to the current perturbation, as well as anticipate coming perturbations. Investigation of muscle activation patterns during continuous, multi-directional perturbations, and the role of previous experience, is warranted to better understand postural control strategies in these types of environments...
February 1, 2018: Journal of Electromyography and Kinesiology
Il-Young Yu, Yeon-Ki Choo, Mon-Hwan Kim, Jae-Seop Oh
The aim of this study was to investigate muscle activity in the infraspinatus and posterior deltoid and infraspinatus muscle thickness during a prone external rotation (PER) exercise using pressure biofeedback. Fifteen healthy men participated in this study, performing PER exercise with pressure biofeedback under four conditions (comfortable, 2 mm Hg, 4 mm Hg, and 8 mm Hg). Surface electromyography (EMG) was used to monitor infraspinatus and posterior deltoid muscle activity, and ultrasonography was used to collect infraspinatus muscle thickness data...
January 31, 2018: Journal of Electromyography and Kinesiology
Nader Farahpour, AmirAli Jafarnezhadgero, Paul Allard, Mahdi Majlesi
The objectives of this study were to investigate whether excessive feet pronation alters the joints' kinematics, kinetics and the activity of involved muscles during gait in low back pain patients. METHODS: The lower limb joints' motion, moment and power, as well as the activity of involved muscles during walking were measured in a control group, and two experimental groups including a group with excessive feet pronation only, and another group of low back pain patients with excessive feet pronation...
January 30, 2018: Journal of Electromyography and Kinesiology
Christos Moschovos, Apostolia Ghika, Nikolaos Karandreas, Andreas Kyrozis
In EMG interference pattern analysis, the peak value of turns to mean amplitude ratio [peak(T/A)] is an established clinically significant marker, but its calculation requires specific software available only in few EMG apparatuses. On the contrary, the turns to mean amplitude ratio obtained at maximal muscle contraction (T/Amax) is easily calculated but less well standardized. We aimed to quantitatively assess the association between T/Amax and peak(T/A). Data were derived from 642 muscle contractions (Nc) from 270 consecutive patients (Np) who underwent EMG at our laboratory (software Dantec Keypoint, QEMG) from May 2015 to September 2016 and had interference patterns obtained from at least one of the following muscles: triceps-lateral head, brachioradialis, extensor digitorum communis and biceps...
January 29, 2018: Journal of Electromyography and Kinesiology
Brecca M M Gaffney, Cory L Christiansen, Amanda M Murray, Bradley S Davidson
The objective of this investigation was to identify demands from core muscles that corresponded with trunk movement compensations during bilateral step ambulation in people with unilateral transtibial amputation (TTA). Trunk rotational angular momentum (RAM) was measured using motion capture and bilateral surface EMG was measured from four bilateral core muscles during step ascent and descent tasks in people with TTA and healthy controls. During step ascent, the TTA group generated larger mediolateral (P = 0...
January 24, 2018: Journal of Electromyography and Kinesiology
Aliah F Shaheen, Alexandros Sourlas, Khim Horton, Christopher McLean, David Ewins, David Gould, Salim Ghoussayni
BACKGROUND: Stair-related falls of older people cause a substantial financial and social burden. Deterioration of the visual system amongst other factors put older people at a high risk of falling. Improved lighting is often recommended. The aim of this study was to investigate the effect of lighting illuminance on stair negotiation performance in older individuals with visual impairment. METHODS: Eleven participants aged 60 or over with a vision of 6/18 or worse ascended and descended a staircase under: 50 lx, 100 lx, 200 lx, 300 lx and distributed 200 lx lighting...
January 16, 2018: Journal of Electromyography and Kinesiology
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