keyword
MENU ▼
Read by QxMD icon Read
search

h-reflex

keyword
https://www.readbyqxmd.com/read/28725191/bilateral-reflex-fluctuations-during-rhythmic-movement-of-remote-limb-pairs
#1
Rinaldo A Mezzarane, Tsuyoshi Nakajima, E Paul Zehr
The modulation of spinal cord excitability during rhythmic limb movement reflects the neuronal coordination underlying actions of the arms and legs. Integration of network activity in the spinal cord can be assessed by reflex variability between the limbs, an approach so far very little studied. The present work addresses this question by eliciting Hoffmann (H-) reflexes in both limbs to assess if common drive onto bilateral pools of motoneurons influence spinal cord excitability simultaneously or with a delay between sides...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28716692/the-fatigue-of-a-full-body-resistance-exercise-session-in-trained-men
#2
Paul W M Marshall, Rebecca Cross, Michael Haynes
OBJECTIVES: We examined the fatigue and recovery for 48h following a full-body resistance exercise session in trained men. DESIGN: Experimental cross-sectional study. METHODS: Eight resistance trained men volunteered to participate (mean±SD; age 27.0±6.0 years, height 1.79±0.05m, weight 81.8±6.8kg, training experience 7.8±5.0 years). Fatigue and pain was measured before, after, 1h post, 24h and 48h post the full-body resistance exercise session, which was based on in-season models used in contact team sports (e...
July 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28716590/lumbar-muscle-inflammation-alters-spinally-mediated-locomotor-recovery-induced-by-training-in-a-mouse-model-of-complete-spinal-cord-injury
#3
Renaud Jeffrey-Gauthier, Mathieu Piché, Hugues Leblond
Locomotor networks after spinal cord injury (SCI) are shaped by training-activated proprioceptive and cutaneous inputs. Nociception from injured tissues may alter these changes but has largely been overlooked. The objective of the present study was to ascertain whether lumbar muscle inflammation hinders locomotion recovery in a mouse model of complete SCI. Lower limb kinematics during treadmill training was assessed before and after complete SCI at T8 (2, 7, 14, 21 and 28 days post-injury). Locomotor recovery was compared in 4 groups of CD1 mice: control spinal mice; spinal mice with daily locomotor training; spinal mice with lumbar muscle inflammation (Complete Freund's Adjuvant (CFA) injection); and spinal mice with locomotor training and CFA...
July 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28684590/heat-acclimation-has-a-protective-effect-on-the-central-but-not-peripheral-nervous-system
#4
Sebastien Racinais, Mathew G Wilson, Nadia Gaoua, Julien D Périard
This study aimed to clarify the pathway mediating hyperthermia-induced alterations in neural drive transmission, and determine if heat acclimation protects voluntary muscle activation and cognitive function in hyperthermic humans. Electrically evoked potentials (H-reflex and M-wave), executive function (special planning and working memory) and maximal voluntary isometric contractions (120 s) were assessed in fourteen participants in control condition (CON, 24ºC, 40% RH) and hyperthermic states (HYP, 44-50ºC, 50% RH), on consecutive days in a counterbalanced order...
July 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28610582/behavioral-and-neural-adaptations-in-response-to-five-weeks-of-balance-training-in-older-adults-a-randomized-controlled-trial
#5
Jan Ruffieux, Audrey Mouthon, Martin Keller, Michael Wälchli, Wolfgang Taube
BACKGROUND: While the positive effect of balance training on age-related impairments in postural stability is well-documented, the neural correlates of such training adaptations in older adults remain poorly understood. This study therefore aimed to shed more light on neural adaptations in response to balance training in older adults. METHODS: Postural stability as well as spinal reflex and cortical excitability was measured in older adults (65-80 years) before and after 5 weeks of balance training (n = 15) or habitual activity (n = 13)...
June 13, 2017: Journal of Negative Results in Biomedicine
https://www.readbyqxmd.com/read/28598858/effects-of-intermittent-theta-burst-stimulation-on-spasticity-after-spinal-cord-injury
#6
Raffaele Nardone, Patrick B Langthaler, Andrea Orioli, Peter Höller, Yvonne Höller, Vanessa N Frey, Francesco Brigo, Eugen Trinka
PURPOSE: Spasticity is a common disorder in patients with spinal cord injury (SCI). The aim of this study was to investigate whether intermittent theta burst stimulation (iTBS), a safe, non-invasive and well-tolerated protocol of excitatory repetitive transcranial magnetic stimulation (rTMS), is effective in modulating spasticity in SCI patients. METHODS: In this randomized, double-blind, crossover, sham-controlled study, ten subjects with incomplete cervical or thoracic SCI received 10 days of daily sessions of real or sham iTBS...
2017: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/28589244/does-spinal-excitability-scale-to-the-difficulty-of-the-dual-task
#7
Devon M Day, Mario T Boivin, Allan L Adkin, Craig D Tokuno
PURPOSE: This study examined whether spinal excitability, as measured by the soleus Hoffmann reflex (H-reflex), is scaled to the difficulty level of the dual-task being performed. METHODS: Twenty-two participants completed a combination of three balance task and three secondary cognitive (visuo-motor) task difficulty levels for a total of nine dual-task conditions. An additional eight participants were tested while performing the same three balance task difficulty levels on its own (i...
August 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28585766/one-minute-plantar-flexors-static-stretch-transiently-increases-h-reflex-excitability-and-exerts-no-effect-on-corticospinal-pathways
#8
Francesco Budini, Eugen Gallasch, Monica Christova, Dietmar Rafolt, Andreas Benedikt Rauscher, Tilp Markus
The purpose of this study was to determine whether the neural responses observed following static stretching are mediated by muscle spindles sensitivity, spinal excitability or cortical excitability and how long these influences last. Nineteen volunteers (25.7 ± 5.6 years) were tested for tap reflex (T-reflex), H-reflex and motor evoked potentials (MEPs) on ankle flexors and extensors at immediately, five and ten minutes after one minute static stretching applied at individual maximal ankle dorsiflexion, as well as immediately, five and ten minutes after a control period of same duration...
June 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28570549/non-invasive-assessment-of-changes-in-corticomotoneuronal-transmission-in-humans
#9
Wolfgang Taube, Christian Leukel, Jens Bo Nielsen, Jesper Lundbye-Jensen
The corticospinal pathway is the major pathway connecting the brain with the muscles and is therefore highly relevant for movement control and motor learning. There exists a number of noninvasive electrophysiological methods investigating the excitability and plasticity of this pathway. However, most methods are based on quantification of compound potentials and neglect that the corticospinal pathway consists of many different connections that are more or less direct. Here, we present a method that allows testing excitability of different fractions of the corticospinal transmission...
May 24, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28528818/patellar-tendon-vibration-reduces-the-increased-facilitation-from-quadriceps-to-soleus-in-post-stroke-hemiparetic-individuals
#10
Eric Maupas, Joseph-Omer Dyer, Sibele de Andrade Melo, Robert Forget
BACKGROUND: Stimulation of the femoral nerve in healthy people can facilitate soleus H-reflex and electromyography (EMG) activity. In stroke patients, such facilitation of transmission in spinal pathways linking the quadriceps and soleus muscles is enhanced and related to co-activation of knee and ankle extensors while sitting and walking. Soleus H-reflex facilitation can be depressed by vibration of the quadriceps in healthy people, but the effects of such vibration have never been studied on the abnormal soleus facilitation observed in people after stroke...
May 18, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28510605/the-role-of-attention-in-human-motor-resonance
#11
Guglielmo Puglisi, Antonella Leonetti, Ayelet Landau, Luca Fornia, Gabriella Cerri, Paola Borroni
Observation of others' actions evokes in primary motor cortex and spinal circuits of observers a subliminal motor resonance response, which reflects the motor program encoding observed actions. We investigated the role of attention in human motor resonance with four experimental conditions, explored in different subject groups: in the first explicit condition, subjects were asked to observe a rhythmic hand flexion-extension movement performed live in front of them. In two other conditions subjects had to monitor the activity of a LED light mounted on the oscillating hand...
2017: PloS One
https://www.readbyqxmd.com/read/28462632/the-relationship-between-trans-lesional-conduction-motor-neuron-pool-excitability-and-motor-function-in-dogs-with-incomplete-recovery-from-severe-spinal-cord-injury
#12
Melissa J Lewis, James F Howard, Natasha J Olby
Spontaneous, acute, complete thoracolumbar spinal cord injury (TL-SCI) in dogs frequently results in permanent deficits modeling chronic paralysis in people. Recovery of walking without recovery of sensation has been interpreted in dogs as reflexive spinal walking. To evaluate this assumption, this study characterized the electrophysiological status of motor and sensory long tracts and local reflex circuitry in dogs with absent recovery of sensation after acute TL-SCI and correlated findings to gait scores...
June 16, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28451748/effects-of-4%C3%A2-weeks-of-low-load-unilateral-resistance-training-with-and-without-blood-flow-restriction-on-strength-thickness-v-wave-and-h-reflex-of-the-soleus-muscle-in-men
#13
David Colomer-Poveda, Salvador Romero-Arenas, Antonio Vera-Ibáñez, Manuel Viñuela-García, Gonzalo Márquez
PURPOSE: To test the effects of 4 weeks of unilateral low-load resistance training (LLRT), with and without blood flow restriction (BFR), on maximal voluntary contraction (MVC), muscle thickness, volitional wave (V wave), and Hoffmann reflex (H reflex) of the soleus muscle. METHODS: Twenty-two males were randomly distributed into three groups: a control group (CTR; n = 8); a low-load blood flow restriction resistance training group (BFR-LLRT; n = 7), who were an inflatable cuff to occlude blood flow; and a low-load resistance training group without blood flow restriction (LLRT; n = 7)...
April 27, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28444940/h-reflex-and-m-wave-recordings-effect-of-pressure-application-to-the-stimulation-electrode-on-the-assessment-of-evoked-potentials-and-subject-s-discomfort
#14
Thomas Cattagni, Angèle N Merlet, Christophe Cornu, Marc Jubeau
This study aimed to compare the effect of different types of pressure applied to the stimulation electrode on assessing the efficiency of Ia-α-motoneuron transmission of the soleus muscle and the associated discomfort using electrical nerve stimulation. Twelve healthy young adults participated in three experimental sessions (one for each knee angle). The amplitudes of the maximal Hoffmann reflex (Hmax ) and motor potential (Mmax ) were recorded from the soleus muscle at 0°, 30° and 90° knee angles (0° full extension) through three pressure applications to the stimulation electrode: no pressure, pressure with manual application and pressure using adhesive tape...
April 26, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28434472/tai-chi-with-mental-imagery-theory-improves-soleus-h-reflex-and-nerve-conduction-velocity-in-patients-with-type-2-diabetes
#15
Abdulrahman Alsubiheen, Jerrold Petrofsky, Noha Daher, Everett Lohman, Edward Balbas, Haneul Lee
OBJECTIVES: Diabetes is a disease that leads to damage to the peripheral nerves which may eventually cause balance instability. The purpose of this study was to determine the effect of 8 weeks of Tai Chi (TC) training combined with mental imagery (MI) on soleus H-reflex and nerve conduction velocity (NCV) of the sural and superficial peroneal nerves in people with diabetes. DESIGNS: Quasi-experimental, one group pretest-posttest design. SETTING: Human Research Laboratory...
April 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/28409395/spinal-and-corticospinal-pathways-are-differently-modulated-when-standing-at-the-bottom-and-the-top-of-a-three-step-staircase-in-young-and-older-adults
#16
Johanna Johannsson, Jacques Duchateau, Stéphane Baudry
PURPOSE: This study investigated the modulation of spinal (group Ia afferents) and corticospinal pathways when young (22.7 ± 1.3 years) and older adults (72.2 ± 7.9 years) stood at the bottom and at the top of a three-step staircase equipped with force platforms. METHOD: Changes in submaximal H-reflex amplitude (H 50) and slope of the H-reflex input-output relation (spinal pathway), and in amplitude of motor-evoked potentials (MEP) triggered by transcranial magnetic stimulation (corticospinal pathway) at two intensities (1...
April 13, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28398968/treadmill-walking-combined-with-anodal-transcranial-direct-current-stimulation-in-parkinson-disease-a-pilot-study-of-kinematic-and-neurophysiological-effects
#17
Helena Fernández-Lago, Olalla Bello, Francina Mora-Cerdá, Jorge Montero-Cámara, Miguel Ángel Fernández-Del-Olmo
OBJECTIVE: We tested the hypothesis that combining treadmill walking with transcranial direct current stimulation (tDCS) enhances the gait improvements associated with treadmill walking in Parkinson disease. We explored the effects of these combined methodologies on corticospinal parameters. DESIGN: Eighteen participants with Parkinson disease were evaluated under the following three conditions: treadmill walking alone (treadmill), treadmill walking combined with anodal tDCS (AtDCS+treadmill) delivered over the motor cortex, and treadmill walking combined with sham stimulation (StDCS+treadmill)...
April 8, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28383320/the-effects-of-patterned-electrical-stimulation-combined-with-voluntary-contraction-on-spinal-reciprocal-inhibition-in-healthy-individuals
#18
Yoko Takahashi, Toshiyuki Fujiwara, Tomofumi Yamaguchi, Michiyuki Kawakami, Katsuhiro Mizuno, Meigen Liu
The aim of this study was to examine the effects of voluntary contraction (VC) on the modulation of reciprocal inhibition induced by patterned electrical stimulation (PES) in healthy individuals. Twelve healthy volunteers participated in this study. PES was applied to the common peroneal nerve with a train of 10 pulses at 100 Hz every 2 s for 20 min. VC comprised repetitive ankle dorsiflexion at a frequency of 0.5 Hz for 20 min. All participants performed the following three tasks: (i) VC alone, (ii) PES alone, and (iii) PES combined with VC (PES+VC)...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28368883/effect-of-gaze-stabilization-exercises-on-vestibular-function-during-postural-control
#19
Akiyoshi Matsugi, Yusuke Ueta, Kosuke Oku, Kojiro Okuno, Yoshiki Tamaru, Shohei Nomura, Hiroaki Tanaka, Nobuhiko Mori
Gaze-stabilization exercise (GSE) is often conducted in vestibular rehabilitation, but its effect on vestibular function in postural control is not clear. We investigated whether GSE affects vestibular function during static upright standing and vestibulospinal reflex (VSR) in healthy young adults. First, the center of pressure of the total trajectory length (CoP-L) was measured before each GSE task or control (only standing) task (pre), immediately after (post), and 10 min after (post10) in the static standing position on foam rubber with the eyes open or closed (EC)...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28342367/optimization-of-surface-electrodes-location-for-h-reflex-recordings-in-soleus-muscle
#20
Alberto Botter, Taian M Vieira
The Hoffmann reflex (H reflex) is extensively used to investigate the spinal motor neuron excitability in healthy and pathological subjects. Obtaining a representative and robust amplitude estimation of the H reflex is of marked relevance in clinical as well as in research applications. As for the motor responses, this issue is strictly related to the electrode positioning, especially for large, pinnate muscles such as the triceps surae. In this study we investigated the effect of electrode position on soleus H-reflex amplitude...
March 16, 2017: Journal of Electromyography and Kinesiology
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"