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https://www.readbyqxmd.com/read/28645664/muscle-activity-and-masticatory-efficiency-with-bilateral-extension-base-removable-partial-dentures-with-different-cusp-angles
#1
Mahmoud K Al-Omiri
STATEMENT OF PROBLEM: Whether masticatory efficiency and electromyographic activity are influenced by type of artificial teeth and food is unclear. PURPOSE: The purpose of this clinical study was to evaluate the influence of extension base removable partial dentures (RPDs) with different cusp angles: anatomic (33 degrees), semianatomic (20 degrees), and nonanatomic (0 degrees) teeth on masticatory efficiency and muscle activity during the mastication of test foods with different textures...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28643681/-magnetic-resonance-neurography-for-the-identification-of-pudendal-neuralgia
#2
Claudia P Cejas, Susana Bordegaray, Nadia I Stefanoff, Cecilia Rollán, Inés T Escobar, Pablo Consigliere Rodríguez
The pudendal nerve entrapment is an entity understudied by diagnosis imaging. Various causes are recognized in relation to difficult labors, rectal, perineal, urological and gynecological surgery, pelvic trauma fracture, bones tumors and compression by tumors or pelvic pseudotumors. Pudendal neuropathy should be clinically suspected, and confirmed by different methods such as electrofisiological testing: evoked potentials, terminal motor latency test and electromyogram, neuronal block and magnetic resonance imaging...
2017: Medicina
https://www.readbyqxmd.com/read/28640883/an-artificial-emg-generation-model-based-on-signal-dependent-noise-and-related-application-to-motion-classification
#3
Akira Furui, Hideaki Hayashi, Go Nakamura, Takaaki Chin, Toshio Tsuji
This paper proposes an artificial electromyogram (EMG) signal generation model based on signal-dependent noise, which has been ignored in existing methods, by introducing the stochastic construction of the EMG signals. In the proposed model, an EMG signal variance value is first generated from a probability distribution with a shape determined by a commanded muscle force and signal-dependent noise. Artificial EMG signals are then generated from the associated Gaussian distribution with a zero mean and the generated variance...
2017: PloS One
https://www.readbyqxmd.com/read/28637786/the-role-of-capsaicin-sensitive-c-fiber-afferent-pathways-in-the-control-of-micturition-in-spinal-intact-and-spinal-cord-injured-mice
#4
Katsumi Kadekawa, Tsuyoshi Majima, Takahiro Shimizu, Naoki Wada, William C de Groat, Anthony J Kanai, Momokazu Goto, Mitsuharu Yoshiyama, Kimio Sugaya, Naoki Yoshimura
We examined bladder and urethral sphincter activity in mice with or without spinal cord injury (SCI) after C-fiber afferent desensitization induced by capsaicin pretreatment and changes in electrophysiological properties of mouse bladder afferent neurons 4 weeks after SCI. Female C57BL/6N mice were divided into 4 groups; (1) spinal intact (SI)-control, (2) SI-capsaicin pretreatment (Cap), (3) SCI-control and (4) SCI-Cap groups. Continuous cystometry and external urethral sphincter (EUS)-electromyogram (EMG) were conducted under an awake condition...
June 21, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28628341/observational-study-of-neural-respiratory-drive-during-sleep-at-high-altitude
#5
Joerg Steier, Nic Cade, Ben Walker, John Moxham, Caroline Jolley
Steier, Joerg, Nic Cade, Ben Walker, John Moxham, and Caroline Jolley. Observational study of neural respiratory drive during sleep at high altitude. High Alt Med Biol. 16:000-000, 2017. AIMS: Ventilation at altitude changes due to altered levels of pO2, pCO2 and the effect on blood pH. Nocturnal ventilation is particularly exposed to these changes. We hypothesized that an increasing neural respiratory drive (NRD) is associated with the severity of sleep-disordered breathing at altitude...
June 19, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28620058/intermittent-hypercapnic-hypoxia-during-sleep-does-not-induce-ventilatory-long-term-facilitation-in-healthy-males
#6
Naomi Louise Deacon, Doug R McEvoy, Daniel L Stadler, Peter G Catcheside
Intermittent hypoxia induced ventilatory neuroplasticity is likely important in obstructive sleep apnea pathophysiology. Although concomitant CO2 levels and arousal state critically influence neuroplastic effects of intermittent hypoxia, no studies have investigated intermittent hypercapnic hypoxia effects during sleep in humans. Thus, the purpose of this study was to investigate if intermittent hypercapnic hypoxia during sleep induces neuroplasticity (ventilatory long-term facilitation and increased chemoreflex responsiveness) in humans...
June 15, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28603358/analysis-of-the-muscular-activities-of-the-tibialis-anterior-and-gastrocnemius-muscles-in-functional-reach
#7
Se-Won Yoon
[Purpose] This study aimed to examine the changes in the muscle activities of each section of the tibialis anterior and gastrocnemius muscles in the functional reach test. [Subjects and Methods] This study selected those who can walk independently, can reach out their arm up to over 25 cm, can show over 90° shoulder joint bending, have not undergone an operation in the lower limb joint, and are not taking any medication affecting their ability to keep their balance from among 24 elderly males and 24 elderly females...
May 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28588472/key-insights-into-hand-biomechanics-human-grip-stiffness-can-be-decoupled-from-force-by-cocontraction-and-predicted-from-electromyography
#8
Hannes Höppner, Maximilian Große-Dunker, Georg Stillfried, Justin Bayer, Patrick van der Smagt
We investigate the relation between grip force and grip stiffness for the human hand with and without voluntary cocontraction. Apart from gaining biomechanical insight, this issue is particularly relevant for variable-stiffness robotic systems, which can independently control the two parameters, but for which no clear methods exist to design or efficiently exploit them. Subjects were asked in one task to produce different levels of force, and stiffness was measured. As expected, this task reveals a linear coupling between force and stiffness...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28575227/relationship-between-psychophysiological-responses-to-aversive-odors-and-nutritional-status-during-normal-aging
#9
Pauline Joussain, Camille Ferdenzi, Jelena Djordjevic, Moustafa Bensafi
Psychophysiological responses to disgusting and pleasant smells are one of the most important aspects of olfaction. These emotional signals can constitute an alert against toxic substances, and they may play a major role in food selection and nutritional intake. The aim of this study was to test this hypothesis by examining whether individual physiological responses to odors could predict the subject's nutritional status. Because aging is associated with changes in emotional response to smells, we also examined how aging affects the relationship between olfaction and nutrition...
July 1, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28572067/texture-dependent-effects-of-pseudo-chewing-sound-on-perceived-food-texture-and-evoked-feelings-in-response-to-nursing-care-foods
#10
Hiroshi Endo, Shuichi Ino, Waka Fujisaki
Because chewing sounds influence perceived food textures, unpleasant textures of texture-modified diets might be improved by chewing sound modulation. Additionally, since inhomogeneous food properties increase perceived sensory intensity, the effects of chewing sound modulation might depend on inhomogeneity. This study examined the influences of texture inhomogeneity on the effects of chewing sound modulation. Three kinds of nursing care foods in two food process types (minced-/puréed-like foods for inhomogeneous/homogeneous texture respectively) were used as sample foods...
May 29, 2017: Appetite
https://www.readbyqxmd.com/read/28566138/a-newly-developed-ultraminiature-wearable-electromyogram-system-useful-for-analyses-of-masseteric-activity-during-the-whole-day
#11
Taihiko Yamaguchi, Saki Mikami, Miku Saito, Kazuki Okada, Akihito Gotouda
PURPOSE: We describe the characteristics of a new data-logger-type ultraminiature electromyogram (EMG) system (FLA-500-SD) and methods used for recording and we show its potential in clinical applications by presenting an example of a clinical case. METHOD: FLA contains electrodes, an amplifier, 12-bit analog-to-digital (A/D) converter at a sampling frequency of 1kHz, 16-bit CPU, a 3.7-V coin-shaped lithium battery, and a micro SD card. The size of FLA is 37.0×23...
May 26, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28555126/altered-motor-unit-discharge-coherence-in-paretic-muscles-of-stroke-survivors
#12
Chenyun Dai, Nina L Suresh, Aneesha K Suresh, William Zev Rymer, Xiaogang Hu
After a cerebral stroke, a series of changes at the supraspinal and spinal nervous system can alter the control of muscle activation, leading to persistent motor impairment. However, the relative contribution of these different levels of the nervous system to impaired muscle activation is not well understood. The coherence of motor unit (MU) spike trains is considered to partly reflect activities of higher level control, with different frequency band representing different levels of control. Accordingly, the objective of this study was to quantify the different sources of contribution to altered muscle activation...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28554078/a-simple-and-robust-method-for-the-automatic-scoring-of-eeg-arousals-in-polysomnographic-recordings
#13
Isaac Fernández-Varela, Diego Alvarez-Estevez, Elena Hernández-Pereira, Vicente Moret-Bonillo
BACKGROUND: Clinical diagnosis of sleep disorders relies on the polysomnographic test to examine the neurophysiological markers of the sleep process. In this test, the recording of the electroencephalographic activity and the submental electromyogram is the source of the analysis for the detection of electroencephalographic arousals. The identification of these events is important for the evaluation of the sleep continuity because they cause the fragmentation of the normal sleep process...
May 13, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28544930/neural-oscillations-demonstrate-that-general-anesthesia-and-sedative-states-are-neurophysiologically-distinct-from-sleep
#14
REVIEW
Oluwaseun Akeju, Emery N Brown
General anesthesia is a man-made neurophysiological state comprised of unconsciousness, amnesia, analgesia, and immobility along with maintenance of physiological stability. Growing evidence suggests that anesthetic-induced neural oscillations are a primary mechanism of anesthetic action. Each anesthetic drug class produces distinct oscillatory dynamics that can be related to the circuit mechanisms of drug action. Sleep is a naturally occurring state of decreased arousal that is essential for normal health...
May 22, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28543166/chronic-emgs-in-treadmill-running-sod1-mice-reveal-early-changes-in-muscle-activation
#15
K A Quinlan, E Kajtaz, J D Ciolino, R D Imhoff-Manuel, M C Tresch, C J Heckman, V M Tysseling
To improve our understanding of early disease mechanisms and find reliable biomarkers of amyotrophic lateral sclerosis (ALS), a progressive neurodegenerative disease, we measured electromyogram (EMG) activity in hind limb muscles of SOD1G93A mice. In contrast to clinical diagnostic measures using EMGs, which are performed on quiescent patients, we monitored activity during treadmill running in order to detect presymptomatic changes in motor patterning. Chronic EMG electrodes were implanted into vastus lateralis (VL), biceps femoris posterior (BFP), lateral gastrocnemius (LG), and tibialis anterior (TA) in mice from postnatal day (P) 55-100, and results were assessed using linear mixed models...
May 24, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28541902/complex-neuromuscular-changes-post-stroke-revealed-by-clustering-index-analysis-of-surface-electromyogram
#16
Xu Zhang, Zhongqing Wei, Xiaoting Ren, Xiaoping Gao, Xiang Chen, Ping Zhou
The objective of this study was to characterize complex neuromuscular changes induced by a hemisphere stroke through a novel clustering index (CI) analysis of surface electromyogram (EMG). The CI analysis was performed using surface EMG signals collected bilaterally from the thenar muscles of 17 subjects with stroke and 12 age-matched healthy controls during their performance of varying levels of isometric muscle contractions. Compared with the neurologically intact or contralateral muscles, mixed CI patterns were observed in the paretic muscles...
May 24, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28539391/reevaluation-of-reflex-responses-of-the-human-masseter-muscle-to-electrical-lip-stimulation
#17
Paulius Uginčius, Gizem Yilmaz, Oguz Sebik, Kemal Sitki Turker
We examined the reflex response of the human masseter muscle to electrical stimulation of the lip using both single motor unit and surface electromyogram based methods. Using the classical analysis methods, reflex response to mild electrical stimuli generated two distinct short-lasting inhibitions. This pattern may reflect the development of combinations of short and long latency inhibitory postsynaptic potentials as a result of the mildly painful electrical lip stimulation. However, this pattern appearing in the classical analysis methods may have developed as a consequence of earlier responses and may not be genuine...
May 24, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28538320/the-effects-of-a-heel-wedge-on-hip-pelvis-and-trunk-biomechanics-during-squatting-in-resistance-trained-individuals
#18
Jesse M Charlton, Connor A Hammond, Christopher K Cochrane, Gillian L Hatfield, Michael A Hunt
Barbell back squats are a popular exercise for developing lower extremity strength and power. However, this exercise has potential injury risks, particularly to the lumbar spine, pelvis, and hip joint. Previous literature suggests heel wedges as a means of favorably adjusting trunk and pelvis kinematics with the intention of reducing such injury risks. Yet no direct biomechanical research exists to support these recommendations. Therefore, the purpose of this study was to examine the effects of heel wedges compared with barefoot on minimally loaded barbell back squats...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28534336/-establishment-of-pelvic-nerve-denervation-modal-in-mice
#19
Huiwen Shi, Yue Tian, Feixiang Dai, Lei Xiao, Zhigang Ke, Weidong Tong
OBJECTIVE: To establishment and verify pelvic nerve denervation (PND) model in mice. METHODS: (1) Establishment of models. Seventy-two healthy male SPE class C57 mice with age of 7 weeks and body weight of (25±1) g were chosen. These 72 mice were randomly divided into PND group containing 36 mice and sham operation group containing 36 mice. Referring to the establishment method of PND rats, after anesthesia, a laparotomy was performed on the mouse with an abdominal median incision...
May 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28504931/robust-real-time-musculoskeletal-modeling-driven-by-electromyograms
#20
Guillaume Durandau, Dario Farina, Massimo Sartori
OBJECTIVE: Current clinical biomechanics involves lengthy data acquisition and time-consuming offline analyses and current biomechanical models cannot be used for real-time control in man-machine interfaces. We developed a method that enables online analysis of neuromusculoskeletal function in vivo in the intact human. METHODS: We used electromyography (EMG)-driven musculoskeletal modeling to simulate all transformations from muscle excitation onset (EMGs) to mechanical moment production around multiple lower-limb degrees of freedom (DOFs)...
May 12, 2017: IEEE Transactions on Bio-medical Engineering
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