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EMG test

A Shimada, L Baad-Hansen, P Svensson
Background/aims Muscular pain often impairs masticatory function in Temporomandibular disorder patients. The specific aim of this study was to investigate how the bite force during mastication is influenced by experimental muscle pain caused by infusion of glutamate into the masseter muscle. Methods 12 healthy adults participated, after providing informed consent. Customized metal frames of the intraoral bite force sensor were manufactured for all subjects, and placed on their preferred chewing side. To induce experimental pain, a sterile solution of glutamate (0...
December 29, 2017: Scandinavian Journal of Pain
Sebastian Färber, Dieter Heinrich, Inge Werner, Peter Federolf
Activation of the hamstrings has been discussed as a measure for reducing strain on the ACL during jump landings in alpine skiing. The current study tested the hypothesis that hamstring and quadriceps activation can be voluntarily increased by the athlete. Specifically, two different instructions - to increase hamstring activation or to increase upper-leg co-contraction - were compared to normal landings. Eight members of the German national and junior national squad in freestyle skiing (age 19.6 ± 3.8 years; weight 66...
June 18, 2018: Journal of Sports Sciences
Pornchai Phukpattaranont, Sirinee Thongpanja, Khairul Anam, Adel Al-Jumaily, Chusak Limsakul
Electromyography (EMG) in a bio-driven system is used as a control signal, for driving a hand prosthesis or other wearable assistive devices. Processing to get informative drive signals involves three main modules: preprocessing, dimensionality reduction, and classification. This paper proposes a system for classifying a six-channel EMG signal from 14 finger movements. A feature vector of 66 elements was determined from the six-channel EMG signal for each finger movement. Subsequently, various feature extraction techniques and classifiers were tested and evaluated...
June 18, 2018: Medical & Biological Engineering & Computing
Simon Podnar, Leja Dolenc Grošelj
OBJECTIVE: Both myopathic and neuropathic tongue protruder muscle changes have been demonstrated to occur in obstructive sleep apnea (OSA) patients using different methods. We tried to elucidate this dilemma using quantitative electromyographic (EMG) methods. METHODS: In a group of consecutive patients with suspected OSA a full overnight polysomnography (PSG) and quantitative needle EMG of the tongue protruder, biceps brachii and vastus lateralis muscles were performed...
June 14, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Boudewijn T H M Sleutjes, Judith Drenthen, Ernest Boskovic, Leonard J van Schelven, Maria O Kovalchuk, Paul G E Lumens, Leonard H van den Berg, Hessel Franssen
OBJECTIVE: To study excitability of single motor units (MUs) using high-density surface-EMG. METHODS: Motor unit action potentials (MUAPs) were evoked by submaximal stimulation of the median nerve at the wrist and recorded with a 9 × 14 electrode grid on the skin overlying the thenar muscles. For excitability tests of single MUs, the most optimal specific single-channel surface-EMG signal was selected based on the spatiotemporal profile of single MUs. RESULTS: Axonal excitability measures were successfully obtained from 14 single MUs derived from ten healthy subjects...
June 1, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
P Salvador-Coloma, M D Arguisuelas, J Doménech-Fernández, D Sánchez-Zuriaga, J J Amer-Cuenca, J Martínez-Gramage, F J Montañez-Aguilera, J F Lisón
INTRODUCTION: Unstable shoes were developed as a walking device to strengthen the lower extremity muscles and reduce joint loading. Many studies have reported increased muscle activity throughout the gait cycle in most of the lower limb muscles in healthy adults using these shoes. However, no previous studies have explored the effects of wearing unstable shoes on trunk muscle activity in patients with chronic low back pain (CLBP). Therefore, the aim of the present study was to compare the activity of selected trunk muscles in patients with CLBP during a gait test while walking wearing unstable shoes or conventional flat shoes (control)...
June 11, 2018: Gait & Posture
Paolo Caravaggi, Giada Lullini, Lisa Berti, Sandro Giannini, Alberto Leardini
BACKGROUND: Flexible flatfoot (FFF) is a common alteration of the foot diagnosed in the pediatric population causing pain and decreased quality of life. Surgical treatment via arthroereisis of the subtalar joint can be recommended when non-invasive options do not result in sufficient pain relief. While clinical outcome of subtalar joint arthroereisis is generally positive, no functional evaluation has thus far been reported following surgery. RESEARCH QUESTION: The aim of this study was to assess the effects of two arthroereisis implants for the correction of bilateral FFF on foot and lower limb biomechanics during gait...
June 11, 2018: Gait & Posture
David A Boyce, Chantal Prewitt
CASE DESCRIPTION: A 17-year-old male post anterior cruciate ligament reconstruction complained of the inability to extend his great toe immediately following surgery. BACKGROUND: Neurological injuries following knee arthroscopy have been reported to occur between 0.6%-2.5%. The most commonly injured nerves are the saphenous and common fibular nerve (CFN). Great toe-drop secondary to isolated denervation of the extensor hallucis longus (EHL), has only been reported one time in the literature...
June 13, 2018: Physiotherapy Theory and Practice
Michael E Hales, John D Johnson
PURPOSE: The study investigated different sport field properties influence on muscular recruitment patterns and metabolic response during a series of running and agility drills. METHODS: Eleven male athletes were fitted with a standard multi-purpose training shoe. The test protocol consisting of four high-intensity trials with 60 seconds rest between trials performed on two fields with different properties. Time-dependent field properties were recorded using ASTM protocol (F-1936)...
June 12, 2018: International Journal of Sports Physiology and Performance
David Hawkes, Michael Grant, Jessica McMahon, Ian Horsley, Omid Khaiyat
Muscular fatigue impacts on normal shoulder function, which is particularly pertinent to throwing athletes. This study aimed to investigate the relationship between grip strength and shoulder muscle fatigue to evaluate the role of grip strength as a surrogate measure for upper limb performance. Twenty healthy participants were recruited. EMG was recorded from 15 shoulder muscles during different fatiguing contractions: an initial baseline recording (Fat-Baseline); after a shoulder exhausting exercise regime (Fat-Exhaustion); and after a 10 min rest period (Fat-Recovery)...
June 6, 2018: Journal of Electromyography and Kinesiology
Jen Rowson, Alaster Yoxall, Victor Gonzalez
The aim of this study was to characterize the muscle activation patterns which underlie the performance of two commonly used grasping patterns and compare the characteristics of such patterns during dexterity tests and activities of daily living. EMG of flexor digitorum and extensor digitorum were monitored from 6 healthy participants as they performed three tasks related to activities of daily living (picking up a coin, drinking from a cup, feeding with a spoon) and three dexterity tests (Variable Dexterity Test-Precision, Variable Dexterity Test-Cylinder, Purdue Pegboard Test)...
2018: Frontiers in Bioengineering and Biotechnology
Ian S Curthoys, J Wally Grant, Ann M Burgess, Chris J Pastras, Daniel J Brown, Leonardo Manzari
Air-conducted sound and bone-conduced vibration activate otolithic receptors and afferent neurons in both the utricular and saccular maculae, and trigger small electromyographic (EMG) responses [called vestibular-evoked myogenic potentials (VEMPs)] in various muscle groups throughout the body. The use of these VEMPs for clinical assessment of human otolithic function is built on the following logical steps: (1) that high-frequency sound and vibration at clinically effective stimulus levels activate otolithic receptors and afferents, rather than semicircular canal afferents, (2) that there is differential anatomical projection of otolith afferents to eye muscles and neck muscles, and (3) that isolated stimulation of the utricular macula induces short latency responses in eye muscles, and that isolated stimulation of the saccular macula induces short latency responses in neck motoneurons...
2018: Frontiers in Neurology
Helô-Isa André, Filomena Carnide, Andreia Moço, Maria-João Valamatos, Fátima Ramalho, Rita Santos-Rocha, António Veloso
The assessment of the plantar-flexors muscle strength in older adults (OA) is of the utmost importance since they are strongly associated with the performance of fundamental tasks of daily life. The objective was to strengthen the validity of the Calf-Raise-Senior (CRS) test by assessing the biomechanical movement pattern of calf muscles in OA with different levels of functional fitness (FF) and physical activity (PA). Twenty-six OA were assessed with CRS, a FF battery, accelerometry, strength tests, kinematics and electromyography (EMG)...
June 5, 2018: Physical Therapy in Sport
Annelies Pool-Goudzwaard, Wim Groeneveld, Michel W Coppieters, Wim Waterink
Research has demonstrated that motor control is directly influenced by observation of others' action, stimulating the mirror neuron system. In addition, there is evidence that both emotion and empathy after observing a painful stimulus affects motor cortical excitability and reaction times. Aim of the present two pilot studies is a) to test for significant influence of observing other's painful bending of the trunk on execution of the same activity in a self-directed bending action (study 1) and to compare these results with a bending action according to a strict bending protocol (study 2)...
June 7, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Hamad S Al Amer, Mohamed A Sabbahi, Hesham N Alrowayeh, William J Bryan, Sharon L Olson
OBJECTIVE: The sit-to-stand (STS) is a simple test to evaluate the functional performance of the quadriceps muscle in patients with knee osteoarthritis (OA). The aim was to evaluate the electromyographic (EMG) activity of the ipsilateral quadriceps during STS task at different seat heights and feet positions in patients with severe unilateral OA. The EMG activity was recorded in a group of eight participants with unilateral OA during the performance of STS task in four conditions: (1) knee-height seat with feet together, (2) knee-height seat with feet askew (feet side by side and heel-to-toe), (3) low-height seat (25% lower than knee-height seat) with feet together, and (4) low-height seat with feet askew...
June 5, 2018: BMC Research Notes
Christopher M Hill, Sam Wilson, J Grant Mouser, Paul T Donahue, Harish Chander
With repeated exposure to postural perturbations the human postural control system can adapt and create efficient strategies to counteract these perturbations. The Motor Control Test (MCT) is commonly used to elicit reactionary postural movements. Though this device has been assessed for possible learning effects and reliability of composite scores, yet no study has evaluated possible neuromuscular alterations repeated bouts might elicit. Twenty participants (age: 25 ± 4.73 years; height: 183.8 ± 8...
May 28, 2018: Journal of Electromyography and Kinesiology
Jens Schmidt
Inflammatory disorders of the skeletal muscle include polymyositis (PM), dermatomyositis (DM), (immune mediated) necrotizing myopathy (NM), overlap syndrome with myositis (overlap myositis, OM) including anti-synthetase syndrome (ASS), and inclusion body myositis (IBM). Whereas DM occurs in children and adults, all other forms of myositis mostly develop in middle aged individuals. Apart from a slowly progressive, chronic disease course in IBM, patients with myositis typically present with a subacute onset of weakness of arms and legs, often associated with pain and clearly elevated creatine kinase in the serum...
2018: Journal of Neuromuscular Diseases
S Vulfsons, S Chervonenko, M Haddad, M H Weisman, N Lavi, G Dar
BACKGROUND: The concept of myofascial continuity suggests that muscles activate along kinematic chains with common fascial coverings. Yet, the literature lacks evidence in regards to the function of anatomical chains in populations suffering from low back pain (LBP). OBJECTIVE: To examine muscle activations along the superficial back line in LBP patients compared to healthy controls. METHODS: The sample study included 20 males with chronic LBP (mean age 28...
May 21, 2018: Journal of Back and Musculoskeletal Rehabilitation
F A Jure, F G Arguissain, J A Biurrun Manresa, O K Andersen
Aims Conditioned pain modulation (CPM) is a paradigm employed to assess descending control of spinal nociception. Previous studies have shown that CPM affects the nociceptive withdrawal reflex (NWR) threshold (RTh), typically assessed in one muscle. However, the NWR activates not one but a group of synergistic muscles, which are recruited by common neural commands to achieve the limb withdrawal. In this regard, synergy analysis can provide the minimum coordinated recruitment of groups of muscles with specific activation balances that describe a movement...
December 29, 2017: Scandinavian Journal of Pain
Thomas Holland, Suzanne Babyar, Brianne Carroll, Sierra Hunt, Katherine Sheeleigh Albright, Mark Wnukowski
Objective Forward head posture lengthens mylohyoid muscles, but its impact on swallowing is unknown. This study determined the effect of sagittal plane neck alignment on surface electromyographic parameters from mylohyoid muscles during oropharyngeal swallowing in healthy, young women. Methods Surface EMG over bilateral mylohyoid muscles was recorded in 10 female subjects (22-37 y, Mean = 30 (5.1)) for average peak amplitude (μV). Percent time to peak activity and duration [s] were recorded in three different sitting postures: habitual posture (HP), exaggerated forward head posture (FHP), and optimal posture (OP) with head positioned in alignment with the spine...
June 3, 2018: Cranio: the Journal of Craniomandibular Practice
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