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https://www.readbyqxmd.com/read/27931775/rhythmic-wrist-movements-facilitate-the-soleus-h-reflex-and-non-voluntary-air-stepping-in-humans
#1
Irina A Solopova, Victor A Selionov, Egor O Blinov, Dmitri S Zhvansky, Yury P Ivanenko
Neural coupling between the upper and lower limbs during human walking is supported by modulation of cross-limb reflexes and the presence of rhythmic activity in the proximal arm muscles. Nevertheless, the involvement of distal arm muscles in cyclic movements and sensorimotor neuromodulation is also suggested given their step-synchronized activation in many locomotor-related tasks (e.g., swimming, skiing, climbing, cycling, crawling, etc.). Here we investigated the effect of rhythmic wrist movements, separately and in conjunction with arm swinging, on the characteristics of non-voluntary cyclic leg movements evoked by muscle vibration in a gravity neutral position and on the soleus H-reflex of the stationary legs...
December 5, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27923188/electrophysiology-in-fisher-syndrome
#2
REVIEW
Satoshi Kuwabara, Yukari Sekiguchi, Sonoko Misawa
Fisher syndrome (FS), a variant of Guillain-Barré syndrome (GBS), is characterized by the clinical triad of ophthalmoplegia, ataxia, and areflexia. The lesion sites for these unique clinical features include the oculomotor nerves and group 1a neurons in the dorsal root ganglion, and the presence of FS is determined by the expression of ganglioside GQ1b in the human nervous system. Neurophysiological findings suggest that ataxia and areflexia are due to an impaired proprioceptive afferent system. Typically, the soleus H-reflex is absent and a body-sway analysis using posturography shows a 1-Hz peak, which indicates proprioception dysfunction...
November 20, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27888745/feasibility-of-eliciting-the-h-reflex-in-the-masseter-muscle-in-patients-under-general-anesthesia
#3
Sedat Ulkatan, Ana Maria Jaramillo, Maria J Téllez, Robert R Goodman, Vedran Deletis
OBJECTIVE: To explore the feasibility of eliciting the brainstem H reflex in the masseter muscle in patients under general anesthesia. METHODS: We electrically stimulated the masseteric nerve, a branch of the trigeminal nerve, and recorded ipsilateral masseteric and temporalis muscle responses. We tested eight patients who presented with trigeminal neuralgia; one patient had a temporal bone tumor and one patient had a brainstem arteriovenous malformation. All responses were elicited when patients were under general anesthesia and before the initiation of surgery...
November 5, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27880831/assessment-of-homonymous-recurrent-inhibition-during-voluntary-contraction-by-conditioning-nerve-stimulation
#4
Sidney Grosprêtre, Julien Duclay, Alain Martin
In humans, the amount of spinal homonymous recurrent inhibition during voluntary contraction is usually assessed by using a peripheral nerve stimulation paradigm. This method consists of conditioning the maximal M-wave (SM stimulus) with prior reflex stimulation (S1), with 10 ms inter-stimulus interval (ISI). The decrease observed between unconditioned (S1 only) and conditioned (S1+SM) reflex size is then attributed to recurrent inhibition. However, during a voluntary contraction, a superimposed SM stimulation leads to a maximal M-wave followed by a voluntary (V) wave at similar latency than the H-reflex...
2016: PloS One
https://www.readbyqxmd.com/read/27879456/hindlimb-spasticity-after-unilateral-motor-cortex-lesion-in-rats-is-reduced-by-contralateral-nerve-root-transfer
#5
Hai Yang Zong, Fenfen Ma, Lai Yin Zhang, Hui Ping Lu, Jing Ru Gong, Min Cai, Hao Dong Lin, Yizhun Zhun Zhu, Chun Lin Hou
The aim was to test the feasibility and effectiveness of contralateral nerve root transfer in reducing post stroke spasticity of the affected hindlimb muscles in rats. In our study, we for the first time created a novel animal hindlimb spastic hemiplegia model in rats with photothrombotic lesion of unilateral motor cortex and we established a novel surgical procedure in reducing motor cortex lesion induced hindlimb spastic hemiplegia in rats. Thirty six rats were randomized into three groups. In group A, rats received sham operation...
November 22, 2016: Bioscience Reports
https://www.readbyqxmd.com/read/27836905/electrophysiological-study-of-femoral-nerve-function-after-a-continuous-femoral-nerve-block-for-anterior-cruciate-ligament-reconstruction-a-randomized-controlled-single-blind-trial
#6
Kevin Stebler, Robin Martin, Kyle Robert Kirkham, Thierry Küntzer, Istvan Bathory, Eric Albrecht
BACKGROUND: A continuous femoral nerve block (CFNB) is an effective analgesic treatment after anterior cruciate ligament (ACL) reconstruction but may result in transient femoral nerve injuries and quadriceps muscle weakness, which in turn contribute to worsened functional outcomes. PURPOSE: To compare electrophysiological criteria of a femoral nerve injury as well as functional and pain-related outcomes after ACL reconstruction when analgesia was provided by a CFNB or intravenous patient-controlled analgesic of morphine (IV PCA)...
November 11, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27834670/resistance-training-with-instability-is-more-effective-than-resistance-training-in-improving-spinal-inhibitory-mechanisms-in-parkinson-s-disease
#7
Carla Silva-Batista, Eugenia Casella Tavares Mattos, Daniel M Corcos, Jessica M Wilson, Charles J Heckman, Helcio Kanegusuku, Maria Elisa Pimentel Piemonte, Marco Túlio de Mello, Claudia Lucia de Moraes Forjaz, Hamilton Roschel, Valmor Alberto Tricoli, Carlos Ugrinowitsch
BACKGROUND: This study assessed: 1) the effects of 12 weeks of resistance training (RT) and resistance training with instability (RTI) on presynaptic inhibition (PSI) and disynaptic reciprocal inhibition (DRI) of patients with Parkinson's disease (PD); 2) the effectiveness of RT and RTI in moving PSI and DRI values of patients towards values of age-matched healthy controls (HC [Z-score analysis]); and 3) associations between PSI and DRI changes and clinical outcomes changes previously published...
November 10, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27824235/radial-shock-wave-therapy-effect-on-pain-and-motor-performance-in-a-paralympic-athlete-a-case-report
#8
Laura Mori, Lucio Marinelli, Elisa Pelosin, Matteo Gambaro, Roberto Trentini, Giovanni Abbruzzese, Carlo Trompetto
BACKGROUND: Recent studies demonstrated the usefulness of Radial Shock Waves Therapy (RSWT) in treating hypertonia in patients affected by cerebral palsy (CP), stroke, and dystonia. RSWT have never been used to treat spasticity in disabled athletes. CASE REPORT: An athlete affected by tetraparesis due to CP underwent three RSWT sessions in a week. We assessed muscular tone using the Modified Ashworth scale (MAS), pain and fatigue experienced during athletic performance with Visual Analogic Scale (VAS) and Borg scale Category-Ratio anchored at number 10 (Borg CR10)...
November 8, 2016: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27783419/effects-of-compression-stockings-on-ankle-muscle-h-reflexes-during-standing
#9
Loic Espeit, Sebastien Pavailler, Thomas Lapole
INTRODUCTION: Wearing compression stockings (CS) may improve postural stability through additional cutaneous feedback. The aim of this study was to further determine how wearing CS could influence spinal excitability by investigating ankle muscle H-reflexes. METHODS: Fifteen subjects were asked to stand barefoot on a rigid floor with their eyes open. H-reflex amplitude was measured in the soleus (SOL), fibularis longus (FL), and tibialis anterior (TA) muscles, with and without CS...
October 26, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27772772/cortical-and-spinal-excitability-in-patients-with-multiple-sclerosis-and-spasticity-after-oromucosal-cannabinoid-spray
#10
Giovanna Squintani, Francesco Donato, Mara Turri, Luciano Deotto, Francesco Teatini, Giuseppe Moretto, Roberto Erro
BACKGROUND: Delta-9-tetrahydrocannabinol and cannabidiol (THC:CBD) oromucosal spray (Sativex®) has been recently approved for the management of treatment-resistant multiple sclerosis (MS) spasticity. Although the symptomatic relief of Sativex® on MS-spasticity has been consistently demonstrated, the pathogenetic implications remain unclear and the few electrophysiological studies performed to address this topic yielded controversial results. We therefore aimed to investigate the mechanisms underpinning the modulation of spastic hypertonia by Sativex®, at both central and spinal levels, through an extensive neurophysiological battery in patients with MS...
November 15, 2016: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/27759502/an-ovine-model-of-spinal-cord-injury
#11
Saul Wilson, Kingsley O Abode-Iyamah, John W Miller, Chandan G Reddy, Sina Safayi, Douglas C Fredericks, Nicholas D Jeffery, Nicole A DeVries-Watson, Sara K Shivapour, Stephanus Viljoen, Brian D Dalm, Katherine N Gibson-Corley, Michael D Johnson, George T Gillies, Matthew A Howard
OBJECTIVE: To develop a large animal model of spinal cord injury (SCI), for use in translational studies of spinal cord stimulation (SCS) in the treatment of spasticity. We seek to establish thresholds for the SCS parameters associated with reduction of post-SCI spasticity in the pelvic limbs, with implications for patients. STUDY DESIGN: The weight-drop method was used to create a moderate SCI in adult sheep, leading to mild spasticity in the pelvic limbs. Electrodes for electromyography (EMG) and an epidural spinal cord stimulator were then implanted...
October 19, 2016: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/27752863/effects-of-daily-tadalafil-on-lower-urinary-tract-symptoms-in-young-men-with-multiple-sclerosis-and-erectile-dysfunction-a-pilot-study
#12
D Francomano, A Ilacqua, A Cortese, G Tartaglia, A Lenzi, M Inghilleri, A Aversa
PURPOSE: Men affected by multiple sclerosis often experience neurogenic overactive bladder (OAB), lower urinary tract symptoms and erectile dysfunction (ED). The aim of the study was to investigate modifications of urinary and sexual functions after administration of daily tadalafil (TAD) 5 mg. METHODS: Twenty men were enrolled in a single-blind, 4-week prospective study while 10 men without treatment served as controls. Primary outcomes were changes from baseline of International Prostate Symptom (IPSS), OAB questionnaire (OAB-q-short form) and International Index of Erectile Function (IIEF-5) scores...
October 17, 2016: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/27736308/dynamic-fatigue-does-not-alter-soleus-h-reflexes-conditioned-by-homonymous-or-heteronymous-pathways
#13
Preeti D Oza, Shauna Dudley-Javoroski, Richard K Shields
H-reflex depression (diminution of amplitude after a conditioning stimulus) is mediated presynaptically and therefore can help distinguish central versus peripheral mechanisms of fatigue. We examined the effects of a dynamic exercise protocol on H-reflex depression using two conditioning methods: homonymous conditioning (paired-pulse tibial nerve stimulation); and heteronymous conditioning (common peroneal nerve stimulation). Ten subjects performed dynamic contractions of the soleus muscle through 30° ankle range of motion...
October 13, 2016: Motor Control
https://www.readbyqxmd.com/read/27718510/mechanomyographic-responses-during-recruitment-curves-in-the-soleus-muscle
#14
Amelia A Miramonti, Nathaniel D M Jenkins, Preeti D Oza, Joseph P Weir, Joel T Cramer
INTRODUCTION: This study examined relationships among mechanomyographic (MMG), electromyographic (EMG), and peak twitch torque (PTT) responses as well as test-retest reliability when recorded during recruitment curves in the soleus muscle. METHODS: PTT, EMG (M-wave, H-reflex), and MMG responses were recorded during recruitment curves in 16 subjects (age=24±2y) on 2 separate days. The sum of the M-wave and H-reflex (M+H) was calculated. Correlations among variables and test-retest reliability were determined...
October 8, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27676800/plastic-changes-in-spinal-synaptic-transmission-following-botulinum-toxin-a-in-post-stroke-spastic-patients
#15
Marjorie Kerzoncuf, Laurent Bensoussan, Jean Michel Viton, Alain Delarque, Christiane Rossi Durand
OBJECTIVE: The therapeutic effects of intramuscular injections of botulinum toxin-type A on spasticity can be largely explained by its blocking action at the neuromuscular junction. BTx-A is assumed also to have a central action by affecting the functional organization of the CNS. The objective was to assess its action on spinal motor networks by investigating the post-activation depression (post-AD) of the soleus H-reflex in post-stroke patients. Post-AD that is a presynaptic mechanism controlling the synaptic efficacy of Ia-motoneuron transmission is involved in the pathophysiology of spasticity...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27632854/does-the-acute-and-short-term-effect-of-whole-body-vibration-is-the-same-on-the-h-reflex-recruitment-curve-and-agility
#16
Morteza Ahmadi, Giti Torkaman, Sedigheh Kahrizi, Mojdeh Ghabaee, Leila Dadashi Arani
CONTEXT: Despite the widespread use of whole body vibration (WBV), especially in recent years, its neurophysiological mechanism is still unclear and it is yet to be determined whether acute and short term WBV exposure produce neurogenic enhancement for agility. OBJECTIVE: To compare the acute and short-term effects of WBV, on the H-reflex recruitment curve and agility . DESIGN: Cross over study. SETTING: Clinical electrophysiology lab...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27614402/contralesional-cathodal-versus-dual-transcranial-direct-current-stimulation-for-decreasing-upper-limb-spasticity-in-chronic-stroke-individuals-a-clinical-and-neurophysiological-study
#17
Alessandra Del Felice, Verena Daloli, Stefano Masiero, Paolo Manganotti
BACKGROUND: Different transcranial direct current stimulation (tDCS) paradigms have been implemented to treat poststroke spasticity, but discordant results have been reported. OBJECTIVE: This study aimed to determine the efficacy and persistence of dual tDCS (anode over affected motor cortex [M1] and cathode over contralateral M1) compared with cathodal tDCS (cathode over contralateral M1) on upper limb (UL) functional, behavioral, and neurophysiological measures in chronic poststroke individuals...
September 7, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27606474/thenar-muscles-h-reflex-in-patients-with-fibromyalgia-a-case-control-study
#18
K Azma, S A Raeissadat, A Hosseini, H Mahmoudi, M Sepehrian, Z Salehi
OBJECTIVE: To delineate H-reflex parameters and specify the diagnostic accuracy measures of thenar muscle H-reflex in Fibromyalgia (FM). METHODS: The study was a cross sectional study performed on 30 subjects with FM and 30 healthy volunteers in two major referral hospitals. We recorded the number of obtainable thenar H-reflexes and their minimum latency, threshold and amplitude in each group. RESULTS: There was a significantly more chance to elicit the H-reflex in patients with FM...
April 2016: Acta Reumatológica Portuguesa
https://www.readbyqxmd.com/read/27590206/intraoperative-spinal-cord-monitoring-using-low-intensity-transcranial-stimulation-to-remove-post-activation-depression-of-the-h-reflex
#19
Jennifer C Andrews, Richard B Stein, Kelvin E Jones, Douglas M Hedden, James K Mahood, Marc J Moreau, Eric M Huang, François D Roy
OBJECTIVE: To investigate whether low intensity transcranial electrical stimulation (TES) can be used to condition post-activation depression of the H-reflex and simultaneously monitor the integrity of spinal motor pathways during spinal deformity correction surgery. METHODS: In 20 pediatric patients undergoing corrective surgery for spinal deformity, post-activation depression of the medial gastrocnemius H-reflex was initiated by delivering two pulses 50-125ms apart, and the second H-reflex was conditioned by TES...
October 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27584511/greater-intensity-of-downslope-walking-exercise-increases-walking-emg-activity-and-h-reflex-depression-3365-board-7-june-3-3-15-pm-5-15-pm
#20
Taylor Rigel, Benjamin Farmer, Dustin Lee, Melissa Keightley, Elizabeth Arnold, Maruf Hoque, Manning Sabatier
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
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