keyword
MENU ▼
Read by QxMD icon Read
search

h-reflex

keyword
https://www.readbyqxmd.com/read/28093306/establishing-between-session-reliability-of-tms-conditioned-soleus-h-reflexes
#1
W A Gray, M J Sabatier, T M Kesar, M R Borich
Transcranial magnetic stimulation (TMS) of the primary motor cortex (M1) can be used to evaluate descending corticomotor influences on spinal reflex excitability through modulation of the Hoffman reflex (H-reflex). The purpose of this study was to characterize between-session reliability of cortical, spinal, and cortical-conditioned spinal excitability measures collected from the soleus muscle. Thirteen able-bodied young adult participants were tested over four sessions. Intraclass correlation coefficients were calculated to quantify between-session reliability of active motor threshold (AMT), unconditioned H-reflexes (expressed as a percentage of Mmax), and conditioned H-reflexes using short-latency facilitation (SLF) and long-latency facilitation (LLF)...
January 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28039767/static-otolithic-drive-alters-presynaptic-inhibition-in-soleus-motor-pool
#2
Apollonia Fox, David Koceja
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28039540/f-wave-of-single-firing-motor-units-correct-or-misleading-criterion-of-motoneuron-excitability-in-humans
#3
Lydia P Kudina, Regina E Andreeva
Motoneuron excitability is a critical property for information processing during motor control. F-wave (a motoneuronal recurrent discharge evoked by a motor antidromic volley) is often used as a criterion of motoneuron pool excitability in normal and neuromuscular diseases. However, such using of F-wave calls in question. The present study was designed to explore excitability of single low-threshold motoneurons during their natural firing in healthy humans and to ascertain whether F-wave is a correct measure of motoneuronal excitability...
December 31, 2016: Neurological Sciences
https://www.readbyqxmd.com/read/28033657/neuromuscular-responses-of-the-plantar-flexors-to-whole-body-vibration
#4
B Harwood, J Scherer, R E Brown, K M D Cornett, K A Kenno, J M Jakobi
Enhanced physical performance following whole-body vibration (WBV) has been attributed to increased muscle activity; however, few studies have measured the mechanisms underlying these changes. The objective of this study was to measure the responsiveness of the Ia pathway as well as contractile properties in 16 young adults (24±2 years, eight men, eight women) following repeated bouts of acute WBV (45 Hz, 2 mm). Hoffman reflexes (H-reflex), compound muscle action potentials (M-wave), and twitch contractile properties were measured prior to and immediately following five 1-minute WBV exposures, and at 3, 5, 10, and 20 minute post-WBV...
December 29, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28013090/walking-duration-and-slope-steepness-determine-the-effect-of-downslope-walking-on-the-soleus-h-reflex-pathway
#5
Elizabeth Arnold, Ben Farmer, Melissa Keightley, Dustin Lee, Taylor Rigel, Maruf Hoque, Manning J Sabatier
The purpose of this study was to determine if the effect of downslope walking (DSW) on spinal excitability depends on walking duration and slope steepness, and if findings from the soleus (Sol) generalize to the tibialis anterior (TA). Sol and TA Hmax and Mmax were measured before and after four DSW doses (time/slope, min/%) on separate days (10/-15, 20/-15, 10/-25, 20/-25, n=14), and one 20-min bout of level walking (LW, n=12), always at 2.5 mph. Heart rate (HR) and ratings of perceived exertion (RPE) were measured during walking...
December 21, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27990123/brief-rewarming-blunts-hypothermia-induced-alterations-in-sensation-motor-drive-and-cognition
#6
Marius Brazaitis, Henrikas Paulauskas, Albertas Skurvydas, Henning Budde, Laura Daniuseviciute, Nerijus Eimantas
Background: It is well known that cold exposure experienced during occupational or recreational activities may adversely affect motor, cognitive performance, and health. Most research has used prolonged passive external rewarming modalities and focused on the direct effects on the kinetics of physiological and psychological responses in hypothermic subjects. However, the brief whole body rewarming effects on physiological and psychological responses in parallel with functional consequences on cognitive and neurophysiological functions have not been investigated...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27973385/acute-corticospinal-and-spinal-modulation-after-whole-body-vibration
#7
A Krause, A Gollhofer, K Freyler, L Jablonka, R Ritzmann
OBJECTIVES: The objective of this study was to investigate neural effects of acute whole body vibration (WBV) on lower limb muscles regarding corticospinal and spinal excitability. METHODS: In 44 healthy subjects (16 f/ 28 m), motor evoked potentials (MEP) and H-reflexes in m. soleus (SOL) and gastrocnemius medialis (GM) were elicited before (t1), immediately after (t2), 2 (t3), 4 (t4) and 10 min after (t5) WBV. RESULTS: After WBV, MEP amplitudes were significantly increased in SOL (t2+15±30%, t3+22±32%, t4+15±35%, t5+20±30%, P<0...
December 14, 2016: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/27965588/unilateral-eccentric-contraction-of-the-plantarflexors-leads-to-bilateral-alterations-in-leg-dexterity
#8
Akira Nagamori, Francisco J Valero-Cuevas, James M Finley
Eccentric contractions can affect musculotendon mechanical properties and disrupt muscle proprioception, but their behavioral consequences are poorly understood. We tested whether repeated eccentric contractions of plantarflexor muscles of one leg affected the dexterity of either leg. Twenty healthy male subjects (27.3 ± 4.0 yrs) compressed a compliant and slender spring prone to buckling with each isolated leg. The maximal instability they could control (i.e., the maximal average sustained compression force, or lower extremity dexterity force, LEDforce) quantified the dexterity of each leg...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27935076/electrophysiologically-identified-piriformis-syndrome-is-successfully-treated-with-incobotulinum-toxin-a-and-physical-therapy
#9
Loren M Fishman, Allen N Wilkins, Bernard Rosner
INTRODUCTION: Piriformis syndrome is entrapment of the sciatic nerve by the piriformis muscle. METHODS: 56-person randomized, double-blinded, controlled study involving physical therapy and incobotulinum toxin A or placebo. INCLUSION CRITERIA: 3 standard deviation delay of posterior tibial (PT) or fibular FN) H-reflexes in flexion, adduction and internal rotation (FAIR-test), and normal paraspinal EMG. OUTCOME MEASURES: adverse side-effects, visual analogue scale (VAS), H-reflex delay in FAIR-test...
December 9, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27931775/rhythmic-wrist-movements-facilitate-the-soleus-h-reflex-and-non-voluntary-air-stepping-in-humans
#10
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
#11
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...
January 2017: 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
#12
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...
January 2017: 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
#13
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
#14
Haiyang Zong, Fenfen Ma, Laiyin Zhang, Huiping Lu, Jingru Gong, Min Cai, Haodong Lin, Yizhun Zhu, Chunlin Hou
Lower extremity spasticity is a common sequela among patients with acquired brain injury. The optimum treatment remains controversial. The aim of our study 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...
December 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
#15
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
#16
Carla Silva-Batista, Eugenia Casella Tavares Mattos, Daniel M Corcos, Jessica M Wilson, Charles J Heckman, Hélcio Kanegusuku, Maria Elisa Pimentel Piemonte, Marco Túlio de Mello, Cláudia Forjaz, Hamilton Roschel, Valmor Tricoli, Carlos Ugrinowitsch
: This study assessed 1) the effects of 12 wk 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 toward values of age-matched healthy controls (HC; Z-score analysis); and 3) associations between PSI and DRI changes and clinical outcomes changes previously published. Thirteen patients in RT group, 13 in RTI group, and 11 in a nonexercising control group completed the trial...
January 1, 2017: 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
#17
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
#18
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
#19
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
#20
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
keyword
keyword
73171
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"