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Tadamitsu Matsuda, Taichi Kurayama, Miki Tagami, Yuji Fujino, Atsushi Manji, Yasuaki Kusumoto, Kazu Amimoto
[Purpose] This study evaluated the effects of repetitive peripheral magnetic stimulation of the soleus muscle on spinal cord and peripheral motor nerve excitability. [Subjects and Methods] Twelve healthy adults (mean age 22 years) who provided written informed consent were administered repetitive peripheral magnetic stimulation for 10 min. Pre-and post-stimulation latencies and amplitudes of H- and M-waves of the soleus muscle were measured using electromyography and compared using paired t-tests. [Results] Pre- and post-stimulation latencies (28...
May 2018: Journal of Physical Therapy Science
Svenja Rink, Habib Bendella, Kurdin Alsolivany, Carolin Meyer, Aliona Woehler, Ramona Jansen, Zeynep Isik, Gregor Stein, Sina Wennmachers, Makoto Nakamura, Doychin N Angelov
BACKGROUND: We compared functional, electrophysiological and morphological parameters after SCI in two groups of rats Sprague Dawley (SD) rats with normal vision and blind rats from a SD-substrain "Royal College of Surgeons" (SD/RCS) who lose their photoreceptor cells after birth due to a genetic defect in the retinal pigment epithelium. For these animals skin-, intramuscular-, and tendon receptors are major available means to resolve spatial information. OBJECTIVE: The purpose of this study was to check whether increased sensitivity in SD/RCS rats would promote an improved recovery after SCI...
March 25, 2018: Restorative Neurology and Neuroscience
Yun Wang, Lan-Fang Yu, Meng-Ya Wang
To observe the plasticity changes of trigeminal motor nucleus (Mo5) and masseter H-reflex in unilateral mastication model rats and explore the possible mechanism of functional plasticity in motor center involved in unilateral mastication, 54 adult male Wistar rats were randomly divided into 1-month (n = 10), 3-month (n = 10), and 16-month (n = 7) model groups and their corresponding control groups, respectively. Unilateral mastication model rats were prepared by intermittent removal of clinical crowns of left teeth (model side)...
February 25, 2018: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Yang Hongliang, Yu Ming, Zhao Qini, Si Daoyuan, Tong Yaliang, Wang Ying, He Yuquan
INTRODUCTION: Atrial premature contractions (APCs) are commonly encountered in clinical practice. The APCs may influence heart conduction system and induce other arrhythmia. The disorder of atrioventricular conduction is related to electrophysiological phenomena, difficult to understand and diagnose. CASE REPORT: We presented a 15-year-old male patient whose baseline electrocardiogram (ECG) was confused with multiple rhythms. Electrophysiological study results showed sinus rhythm with nonconducted APCs in bigeminal rhythm...
December 2017: Medicine (Baltimore)
Maria E Ceballos-Villegas, Juan J Saldaña Mena, Ana L Gutierrez Lozano, Francisco J Sepúlveda-Cañamar, Nayeli Huidobro, Elias Manjarrez, Joel Lomeli
The Hoffmann reflex (H-wave) is produced by alpha-motoneuron activation in the spinal cord. A feature of this electromyography response is that it exhibits fluctuations in amplitude even during repetitive stimulation with the same intensity of current. We herein explore the hypothesis that physical training induces plastic changes in the motor system. Such changes are evaluated with the fractal dimension (FD) analysis of the H-wave amplitude-fluctuations (H-wave FD) and the cross-covariance (CCV) between the bilateral H-wave amplitudes...
2017: Frontiers in Human Neuroscience
Ahmet Özsimsek, Hasan Rifat Koyuncuoglu
We aimed to investigate changes in electrophysiological findings in Turkish patients with restless legs syndrome (RLS), including F-wave latency (FWL), peripheral silent period (PSP), and Hoffmann reflex. The study took place in a university hospital in Turkey and involved 30 newly diagnosed RLS patients and 30 healthy controls who were matched for age and gender. Participant's demographics (age, gender, weight, and height), laboratory findings, and electrophysiological test outcomes were gathered and analyzed...
2017: Neuropsychiatric Disease and Treatment
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...
November 1, 2017: Journal of Neurotrauma
Y O Mukhamedshina, Z E Gilazieva, S S Arkhipova, L R Galieva, E E Garanina, A A Shulman, G G Yafarova, Y A Chelyshev, N V Shamsutdinova, A A Rizvanov
In this study, we examined the efficacy of human umbilical cord blood mononuclear cells (hUCB-MCs), genetically modified with the VEGF and GDNF genes using adenoviral vectors, on posttraumatic regeneration after transplantation into the site of spinal cord injury (SCI) in rats. Thirty days after SCI, followed by transplantation of nontransduced hUCB-MCs, we observed an improvement in H (latency period, LP) and M( A max ) waves, compared to the group without therapy after SCI. For genetically modified hUCB-MCs, there was improvement in A max of M wave and LP of both the M and H waves...
2017: Neural Plasticity
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
Arnab Samanta
We perform an inviscid, spatial stability analysis of supersonic, heated round jets with the mean properties assumed uniform on either side of the jet shear layer, modelled here via a cylindrical vortex sheet. Apart from the hydrodynamic Kelvin-Helmholtz (K-H) wave, the spatial growth rates of the acoustically coupled supersonic and subsonic instability waves are computed for axisymmetric conditions (m=0) to analyse their role on the jet stability, under increased heating and compressibility. With the ambient stationary, supersonic instability waves may exist for any jet Mach number Mj ≥2, whereas the subsonic instability waves, in addition, require the core-to-ambient flow temperature ratio Tj /To >1...
April 2016: Proceedings. Mathematical, Physical, and Engineering Sciences
Kamran Azma, Seyyed Ahmad Raeissadat, Alireza Hosseini, Hooman Mahmoudi, Mohammad Hosein Sepehrian, Zahra 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...
January 3, 2016: Acta Reumatológica Portuguesa
Guillaume Caron, Tanguy Marqueste, Patrick Decherchi
The purpose of this study was to evaluate the effects of aging and chronic physical activity on the postactivation depression of the Hoffman reflex (H-reflex). The maximal amplitude H wave/maximal amplitude M wave ratio was measured, and the rate-sensitive depression of the H-reflex was assessed. Measurements were performed on sedentary rats aged of 3, 6, 12, and 20 months and on animals aged of 12 and 20 months performing an incremental treadmill exercise protocol during the last eight weeks preceding the recordings...
June 2016: Neurobiology of Aging
Katsuhiro Furukawa, Takayuki Fujiwara, Koji Abe, Masayosi Kamijo
The aim of this study was to measure the H wave by using voice-activated electromyography to reveal how different speech outputs affect the spinal cord segments innervating the lower limb skeletal muscles. In 21 healthy adults (16 men and 5 women) seated in a semi-reclined position, the H wave was recorded using surface electrodes over the soleus muscle of the pivot leg after stimulating the tibial nerve. The amplitude of the H wave was 1.02 SD 0.69 mV under the pre-vocalization condition; 1.51 SD 0.76 mV under the submaximal vocalization condition (≥60-<80 dB); and 1...
2016: Physiotherapy Theory and Practice
Sarah Kneis, Anja Wehrle, Kathrin Freyler, Katrin Lehmann, Britta Rudolphi, Bernd Hildenbrand, Hans Helge Bartsch, Hartmut Bertz, Albert Gollhofer, Ramona Ritzmann
OBJECTIVE: Chemotherapy-induced peripheral neuropathy (CIPN) is a common side effect of cancer treatment. Resulting sensory and motor dysfunctions often lead to functional impairments like gait or balance disorders. As the underlying neuromuscular mechanisms are not fully understood, we compared balance performance of CIPN patients with healthy controls (CON) to specify differences responsible for postural instability. METHODS: 20 breast cancer patients with CIPN (PAT) and 16 matched CONs were monitored regarding centre of pressure displacement (COP) and electromyographic activity of M...
February 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Dae Hyun Kim, Ji Cheol Shin, Seungsoo Jung, Tae-Min Jung, Deog Young Kim
Spasticity is a common cause of long-term disability in poststroke hemiplegic patients. We investigated whether intermittent theta burst stimulation (iTBS) could reduce upper-limb spasticity after a stroke. Fifteen hemiplegic stroke patients were recruited for a double-blind sham-controlled cross-over design study. A single session of iTBS or sham stimulation was delivered on the motor hotspot of the affected flexor carpi radialis muscle in a random and counterbalanced order with a 1-week interval. Modified Ashworth scale (MAS), modified Tardieu scale (MTS), H-wave/M-wave amplitude ratio, peak torque (PT), peak torque angle (PTA), work of affected wrist flexor, and rectified integrated electromyographic activity of the flexor carpi radialis muscle were measured before, immediately after, 30 min after, and 1 week after iTBS or sham stimulation...
July 8, 2015: Neuroreport
C G Jolivalt, M Rodriguez, J Wahren, N A Calcutt
AIMS: To investigate the efficacy of a pegylated C-peptide (Peg-C-peptide) against indices of peripheral neuropathy in a mouse model of type 1 diabetes and to compare efficacy of this C-peptide analogue against that of the native molecule. METHODS: C57Bl/6 mice were injected with two consecutive doses of streptozotocin (STZ) to induce type 1 diabetes. Mice were treated twice daily with native C-peptide [0.4-1.3 mg/kg subcutaneously (s.c.)] or twice weekly with Peg-C-peptide (0...
August 2015: Diabetes, Obesity & Metabolism
Anteneh M Feyissa, Sudhakar Tummala
The aim of this study was examine the role of Hoffmann reflex (H-reflex) monitoring in identifying intraoperative spinal cord injury and predicting postoperative neurological outcome in patients undergoing thoracic spine surgery. Despite the physiologic basis for the use of H-reflex to monitor spinal motor pathways, there are only a few reports highlighting its application as an intraoperative neuromonitoring tool. We retrospectively reviewed the electronic medical records of 19 consecutive patients who underwent thoracic spine surgery for metastatic thoracic spinal tumors between 2011 and 2013 at the MD Anderson Cancer Center...
June 2015: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
Yujiro Masu, Ken Muramatsu
[Purpose] This study aimed to clarify the characteristics of motor neuron excitability by examining the soleus H-reflex in the ready position adopted immediately before making a return during badminton games. [Subjects] Sixteen individuals with (badminton group) and 16 without (control group) experience of playing badminton were studied. [Methods] Each subject was instructed to take up various stances for returning a shuttlecock to measure the H- and M-waves in the soleus. [Results] The H-wave was significantly decreased when gripping a racket was held in the dominant hand than compared to just standing in the badminton group...
January 2015: Journal of Physical Therapy Science
Michelle C Potter, Krystyna M Wozniak, Noelle Callizot, Barbara S Slusher
Pyridoxine is used as a supplement for treating conditions such as vitamin deficiency as well as neurological disorders such as depression, epilepsy and autism. A significant neurologic complication of pyridoxine therapy is peripheral neuropathy thought to be a result of long-term and high dose usage. Although pyridoxine-induced neuropathy is transient and can remit after its withdrawal, the process of complete recovery can be slow. Glutamate carboxypeptidase II (GCP II) inhibition has been shown to improve symptoms of both chemotherapy- and diabetic-induced neuropathy...
2014: PloS One
Christopher C Matthews, Paul S Fishman, George F Wittenberg
INTRODUCTION: Skeletal muscles that are under the influence of tetanus toxin show an exaggerated reflex response to stretch. We examined which changes in the stretch reflex may underlie the exaggerated response. METHODS: H-reflexes were obtained from the tibialis anterior (TA) and flexor digitorum brevis (FDB) muscles in rats 7 days after intramuscular injection of tetanus toxin into the TA. RESULTS: We found effects of the toxin on the threshold, amplitude, and duration of H-waves from the TA...
April 2014: Muscle & Nerve
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