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https://www.readbyqxmd.com/read/29913378/testing-neurophysiological-markers-related-to-fear-potentiated-startle
#1
Antonia V Seligowski, Erin Bondy, Paris Singleton, Holly K Orcutt, Kerry J Ressler, Randy P Auerbach
Fear-potentiated startle (FPS) paradigms provide insight into fear learning mechanisms that contribute to impairment among individuals with posttraumatic stress symptoms (PTSS). Electrophysiology also has provided insight into these mechanisms through the examination of event-related potentials (ERPs) such as the P100 and LPP. It remains unclear, however, whether the P100 and LPP may be related to fear learning processes within the FPS paradigm. To this end, we tested differences in ERP amplitudes for conditioned stimuli associated (CS+) and not associated (CS-) with an aversive unconditioned stimulus (US) during fear acquisition...
June 11, 2018: Psychiatry Research
https://www.readbyqxmd.com/read/29912857/stretch-could-reduce-hamstring-injury-risk-during-sprinting-by-right-shifting-the-length-torque-curve
#2
Mianfang Ruan, Li Li, Chen Chen, Xie Wu
Ruan, M, Li, L, Chen, C, and Wu, X. Stretch could reduce hamstring injury risk during sprinting by right shifting the length-torque curve. J Strength Cond Res XX(X): 000-000, 2018-It was hypothesized that static stretch would shift the length-torque curve to the right, which may reduce the risk of muscle strain injuries. The purpose of this study was to evaluate the acute effects of static stretching of hamstring (SSH) on the risk of hamstring injury during sprinting indicated by the shift of the length-torque relationship...
June 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29911250/evaluation-of-feature-extraction-techniques-and-classifiers-for-finger-movement-recognition-using-surface-electromyography-signal
#3
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
https://www.readbyqxmd.com/read/29910993/surface-electromyographic-analysis-of-differential-effects-in-kettlebell-carries-for-the-serratus-anterior-muscles
#4
Alex Caravan, John O Scheffey, Sam J Briend, Kyle J Boddy
The purpose of this study was to examine differences in the Electromyography (EMG) amplitude of the serratus anterior between 45° kettlebell carries and 90° kettlebell carries. Thirty-three men aged roughly between 19 and 23 and who were either college or professional baseball pitchers were chosen and randomly assigned to either perform the 45° kettlebell carry followed by the 90° kettlebell carry ( n = 17) or the 90° kettlebell carry followed by the 45° kettlebell carry ( n = 16). Each pitcher was instructed in the proper usage of the exercise and assigned a short break between the two carries...
2018: PeerJ
https://www.readbyqxmd.com/read/29909357/abdominal-muscle-recruitment-and-its-effect-on-the-activity-level-of-the-hip-and-posterior-thigh-muscles-during-therapeutic-exercises-of-the-hip-joint
#5
Sharon M H Tsang, Amanda H M Lam, Melody H L Ng, Kiki W K Ng, Cherry O H Tsui, Benjamin Yiu
Abdominal exercise has been advocated to improve the protection of the spine and neuromuscular efficiency of the limb movements. The purpose of this study was to examine the effect of enhanced contraction of internal oblique and transversus abdominis (IO/TrA) on the activity level of the hip and posterior thigh muscles during therapeutic hip exercises. Twenty healthy females were required to perform eight hip exercises under two conditions, natural versus enhanced IO/TrA contraction conditions. Muscle activity of gluteus maximus, gluteus medius, tensor fasciae latae and biceps femoris of the exercising leg was measured by surface electromyography during hip exercises, and expressed in percentage normalized to the maximal voluntary isometric contraction (%MVIC)...
June 12, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29909356/an-automatic-adaptive-information-based-algorithm-for-the-extraction-of-the-semg-envelope
#6
Simone Ranaldi, Cristiano De Marchis, Silvia Conforto
Surface ElectroMyography (sEMG) is widely used as a non-invasive tool for the assessment of motor control strategies. However, the standardization of the methods used for the estimation of sEMG amplitude is a problem yet to be solved; in most cases, sEMG amplitude is estimated through the extraction of the envelope of the signal via different low-pass filtering procedures with fixed cut-off frequencies chosen by the experimenter. In this work, we have shown how it is not possible to find the optimal choice of the cut-off frequency without any a priori knowledge on the signal; considering this, we have proposed an updated version of an iterative adaptive algorithm already present in literature, aiming to completely automatize the sEMG amplitude estimation...
June 14, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29909231/effects-of-unstable-shoes-on-trunk-muscle-activity-in-patients-with-chronic-low-back-pain
#7
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
https://www.readbyqxmd.com/read/29909230/postural-stability-and-trunk-muscle-responses-to-the-static-and-perturbed-balance-tasks-in-individuals-with-and-without-symptomatic-degenerative-lumbar-disease
#8
Yun-Chung Lin, Chi-Chien Niu, Mohammad Nikkhoo, Meng-Ling Lu, Wen-Chien Chen, Chen-Ju Fu, Chih-Hsiu Cheng
BACKGROUND: Degenerative lumbar diseases (DLDs) are characterized by motor functional deficits and postural instability. In this study, we investigated the differences in the trunk muscle responses to postural control between the presurgical DLD patients and healthy individuals while performing the static and perturbed balance tasks. METHODS: Thirty-five DLD patients (aged 61.1 ± 8.0 years) and thirty-five asymptomatic controls (aged 62.9 ± 3.7 years) participated in this study...
June 11, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29909211/stereotactic-selective-thalamotomy-for-focal-dystonia-with-aid-of-depth-microrecording
#9
Masafumi Hirato, Takaaki Miyagishima, Akio Takahashi, Yuhei Yoshimoto
OBJECTIVE: Long-term effectiveness of selective ventralis intermedius (VIM)-ventralis oralis (VO) thalamotomy with depth microrecording for the treatment of focal dystonia was evaluated. The optimal thalamic areas for controlling focal dystonia were studied based on the electrophysiological and anatomical data. METHODS: Stereotactic selective VIM-VO thalamotomy with depth microrecording was carried out in 8 patients with focal arm and hand dystonia and in one patient with cervical dystonia...
June 14, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29908653/evaluating-skeletal-muscle-electromechanical-delay-with-intramuscular-pressure
#10
Shanette A Go, William J Litchy, Loribeth Q Evertz, Kenton R Kaufman
INTRODUCTION: Intramuscular pressure (IMP) is the fluid pressure generated within skeletal muscle and directly reflects individual muscle tension. The purpose of this study was to assess the development of force, IMP, and electromyography (EMG) in the tibialis anterior (TA) muscle during ramped isometric contractions and evaluate electromechanical delay (EMD). METHODS: Force, EMG, and IMP were simultaneously measured during ramped isometric contractions in eight young, healthy human subjects...
June 8, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29908034/association-between-chewing-dysfunctions-and-temporomandibular-disorders-a-systematic-review
#11
REVIEW
Maria Carolina Ferreira, Isabela Porto de Toledo, Kamile Leonardi Dutra, Fabiane Miron Stefani, André Luís Porporatti, Carlos Flores-Mir, Graziela De Luca Canto
Temporomandibular disorder (TMD) is an umbrella condition presenting several signs and symptoms including pain in the temporomandibular joint (TMJ) and masticatory muscles, articular noises, earache, headache, irregular or restricted jaw function, chewing difficulty, and limited mouth opening. Such TMD impairment may cause disorders during the chewing process. Therefore, the purpose of this systematic review was to assess chewing dysfunctions measured by sEMG, and their association with TMD. A combination and variation of the descriptors "temporomandibular joint disorders", "masticatory dysfunctions", and electromyography were used to perform the searches across databases...
June 16, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29907780/effects-of-8-week-sensory-electrical-stimulation-combined-with-motor-training-on-eeg-emg-coherence-and-motor-function-in-individuals-with-stroke
#12
Li-Ling Hope Pan, Wen-Wen Yang, Chung-Lan Kao, Mei-Wun Tsai, Shun-Hwa Wei, Felipe Fregni, Vincent Chiun-Fan Chen, Li-Wei Chou
The peripheral sensory system is critical to regulating motor plasticity and motor recovery. Peripheral electrical stimulation (ES) can generate constant and adequate sensory input to influence the excitability of the motor cortex. The aim of this proof of concept study was to assess whether ES prior to each hand function training session for eight weeks can better improve neuromuscular control and hand function in chronic stroke individuals and change electroencephalography-electromyography (EEG-EMG) coherence, as compared to the control (sham ES)...
June 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29903631/-evidence-of-sensory-bladder-inhibitor-reflex
#13
F Charoenwong, A Charlanes, C Chesnel, D Menoux, D Motavasseli, E Tan, F Le Breton, G Amarenco
INTRODUCTION: Need to void level depends on two parameters, bladder volume and attentional process. If it is well known that the maximum voluntary contraction of the perineal muscles may transiently inhibit the micturition reflex itself, no work demonstrates the effect of this contraction on the intensity of the need itself. METHODS: An experimental, prospective, open, monocentric study was conducted between March and April 2017. In total, 15 subjects with no neurological history or neuro-perineal disorders consulting for functional constipation were included...
June 11, 2018: Progrès en Urologie
https://www.readbyqxmd.com/read/29903623/immune-checkpoint-mediated-myositis-and-myasthenia-gravis-a-case-report-and-review-of-evaluation-and-management
#14
Kylie H Kang, William Grubb, Komal Sawlani, Michael K Gibson, Christopher J Hoimes, Lisa R Rogers, Pierre Lavertu, Min Yao
BACKGROUND: We present a case of myositis and possible overlapping neuromuscular junction disorder following treatment with nivolumab for recurrent/metastatic head and neck squamous cell carcinoma (HNSCC). METHODS: We report a 75-year-old man with recurrent stage IVA, T1N2cM0 oral cavity HNSCC treated with weight-dosed nivolumab who presented three weeks later with severe fatigue, generalized weakness, and bilateral ptosis. Evaluation demonstrated elevated creatine kinase and myopathic motor units on electromyography, supporting a diagnosis of an underlying muscle disease...
June 5, 2018: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/29903447/neurophysiology-of-gait
#15
Mariano Serrao, Alberto Ranavolo, Carlo Casali
Beyond the classic clinical description, recent studies have quantitatively evaluated gait and balance dysfunction in cerebellar ataxias by means of modern motion analysis systems. These systems have the aim of clearly and quantitatively describing the differences, with respect to healthy subjects, in kinematic, kinetic, and surface electromyography variables, establishing the basis for a rehabilitation strategy and assessing its efficacy. The main findings which characterize the gait pattern of cerebellar patients are: increased step width, reduced ankle joint range of motion with increased coactivation of the antagonist muscles, and increased stride-to-stride variability...
2018: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29902713/full-gait-cycle-analysis-of-lower-limb-and-trunk-kinematics-and-muscle-activations-during-walking-in-participants-with-and-without-ankle-instability
#16
Lynsey Northeast, Charlotte N Gautrey, Lindsay Bottoms, Gerwyn Hughes, Andrew C S Mitchell, Andrew Greenhalgh
BACKGROUND: Chronic ankle instability (CAI) has previously been linked to altered lower limb kinematics and muscle activation characteristics during walking, though little research has been performed analysing the full time-series across the stance and swing phases of gait. RESEARCH QUESTION: The aim of this study was to compare trunk and lower limb kinematics and muscle activity between those with chronic ankle instability and healthy controls. METHODS: Kinematics and muscle activity were measured in 18 (14 males, 4 females) healthy controls (age 22...
June 7, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29902705/the-effect-of-eccentric-exercise-and-delayed-onset-muscle-soreness-on-the-homologous-muscle-of-the-contralateral-limb
#17
Nosratollah Hedayatpour, Zahra Izanloo, Deborah Falla
High intensity eccentric exercise induces muscle fiber damage and associated delayed-onset muscle soreness (DOMS) resulting in an impaired ability of the muscle to generate voluntary force. This study investigates the extent to which DOMS, induced by high intensity eccentric exercise, can affect the activation and performance of the non-exercised homologous muscle of the contralateral limb. Healthy volunteers performed maximal voluntary contractions of knee extension and sustained isometric knee extension at 50% of maximal force until task failure on both the ipsilateral exercised limb and the contralateral limb...
June 6, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29901616/a-novel-dmd-splicing-mutation-found-in-a-family-responsible-for-x-linked-dilated-cardiomyopathy-with-hyper-ckemia
#18
Jin Tang, Xueqin Song, Guang Ji, Hongran Wu, Shuyan Sun, Shan Lu, Yuan Li, Chi Zhang, Huiqing Zhang
This study was aimed to detect a new mutation responsible for X-linked dilated cardiomyopathy with hyper-CKemia.We studied a proband who presented with cardiac symptoms with hyper-CKemia, but no clinical skeletal involvement in physical examination, laboratory tests, electromyography, echocardiography, and magnetic resonance imaging (MRI) of cardiac muscles. Muscle biopsy for histopathology and immunohistochemistry for accessing sarcolemma changes. The next-generation sequencing and bioinformatics analysis were performed on the patient and Sanger sequencing was confirmed on the other 6 unaffected families...
June 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29899692/low-gain-servo-control-during-the-kohnstamm-phenomenon-reveals-dissociation-between-low-level-control-mechanisms-for-involuntary-vs-voluntary-arm-movements
#19
Jack De Havas, Sho Ito, Patrick Haggard, Hiroaki Gomi
The Kohnstamm phenomenon is a prolonged involuntary aftercontraction following a sustained voluntary isometric muscle contraction. The control principles of the Kohnstamm have been investigated using mechanical perturbations, but previous studies could not dissociate sensorimotor responses to perturbation from effects of gravity. We induced a horizontal, gravity-independent Kohnstamm movement around the shoulder joint, and applied resistive or assistive torques of 0.5 Nm after 20° angular displacement. A No perturbation control condition was included...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29898587/how-effective-is-physical-therapy-for-gait-muscle-activity-in-hemiparetic-patients-who-receive-botulinum-toxin-injections
#20
Kazuki Fujita, Hiroichi Miaki, Hideaki Hori, Yasutaka Kobayashi, Takao Nakagawa
BACKGROUND: Administration of botulinum neurotoxin A (BoNT-A) to the ankle plantar flexors in patients with hemiplegia reduces the strength of knee extension, which may decrease their walking ability. Studies have reported improvements in walking ability with physical therapy following BoNT-A administration. However, no previous studies have evaluated from an exercise physiology perspective the efficacy of physical therapy after BoNT-A administration for adult patients with hemiplegia...
June 11, 2018: European Journal of Physical and Rehabilitation Medicine
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