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https://www.readbyqxmd.com/read/28728077/comparison-of-spinal-stability-following-motor-control-and-general-exercises-in-nonspecific-chronic-low-back-pain-patients
#1
MohammadBagher Shamsi, Javad Sarrafzadeh, Aliashraf Jamshidi, Navid Arjmand, Farshid Ghezelbash
BACKGROUND: Motor control exercise was claimed to improve spinal stability in patients with chronic non-specific back pain, but to investigate the effectiveness of this exercise, other outcome measures have been used rather than spinal stability itself. The aim of our study is to assess motor control exercise effects on spinal stability using a biomechanical model. METHODS: Fifty-one patients were assigned to either motor control or general exercises. Before and after trainings, participants were tested for spinal stability at seven isometric tasks...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28727560/a-multimodal-framework-based-on-integration-of-cortical-and-muscular-activities-for-decoding-human-intentions-about-lower-limb-motions
#2
Chengkun Cui, Gui-Bin Bian, Zeng-Guang Hou, Jun Zhao, Hao Zhou
In this study, a multimodal fusion framework based on three different modal biosignals is developed to recognize human intentions related to lower limb multi-joint motions which commonly appear in daily life. Electroencephalogram (EEG), electromyogram (EMG) and mechanomyogram (MMG) signals were simultaneously recorded from twelve subjects while performing nine lower limb multi-joint motions. These multimodal data are used as the inputs of the fusion framework for identification of different motion intentions...
July 18, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28724779/chronic-pain-alters-spatiotemporal-activation-patterns-of-forearm-muscle-synergies-during-the-development-of-grip-force
#3
Nagarajan Manickaraj, Leanne M Bisset, Venkata S P T Devanaboyina, Justin J Kavanagh
It is largely unknown how the CNS regulates multiple muscle systems in the presence of pain. This study used muscle synergy analysis to investigate multiple forearm muscles in individuals with chronic elbow pain during the development of grip force. Eleven individuals with chronic elbow pain and 11 healthy age-matched controls developed grip force to 15% and 30% of MVC. Surface EMG was obtained from six forearm muscles during force development before non-negative matrix factorization was performed. The relationship between muscle synergies and standard clinical tests of elbow pain were examined using linear regression...
July 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28724204/gait-and-balance-impairment-after-acute-methanol-poisoning
#4
Kamila Peterová, Hana Brožová, Jiří Klempíř, Irena Lišková, Ondřej Bezdíček, Petr Ridzoň, Manuela Vaněčková, Sergej Zakharov, Daniela Pelclová, Michal Miovský, Evžen Růžička
Neurological sequelae including gait impairment were reported in survivors after methanol intoxication; however, no systematic study has been published so far. We aimed to analyse gait and balance impairment in a group of Czech methanol poisoning survivors. We examined 43 patients (age 46±13 years) 2-8 months after methanol poisoning and 43 healthy controls. Investigations contained a shortened version of Falls Efficacy Scale (FES), clinical tests of gait and balance including Timed Up and Go test (TUG) and gait analysis using GaitRite(®) system, neurological and neuropsychological examination, brain imaging, EMG and tests of alcohol consumption...
July 19, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28720183/g-loc-warning-algorithms-based-on-emg-features-of-the-gastrocnemius-muscle
#5
Sungho Kim, Taehwan Cho, Yongkyun Lee, Hyojin Koo, Booyong Choi, Dongsoo Kim
BACKGROUND: G-induced loss of consciousness (G-LOC) is mainly caused by failure to sustain an oxygenated blood supply to the pilot's brain because of the sudden acceleration in the direction of the +Gz axis, and is considered a critical safety issue. The purpose of this study was to develop G-LOC warning algorithms based on monitoring electromyograms (EMG) of the gastrocnemius muscle on the calf. METHODS: EMG data was retrieved from a total of 67 pilots and pilot trainees of the Korean Air Force during high-G training on a human centrifugal simulator...
August 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28719827/mixed-evidence-for-the-potential-of-non-invasive-transcutaneous-vagal-nerve-stimulation-to-improve-the-extinction-and-retention-of-fear
#6
A M Burger, B Verkuil, H Fenlon, L Thijs, L Cools, H C Miller, B Vervliet, I Van Diest
Extinction memories are fragile and their formation has been proposed to partially rely on vagus nerve activity. We tested whether stimulating the auricular branch of the vagus (transcutaneous VNS; tVNS) accelerates extinction and reduces spontaneous recovery of fear. Forty-two healthy students participated in a 3-day fear conditioning study, where we tested fear acquisition (day 1), fear extinction (day 2) and the retention of the extinction memory (day 3). During extinction, participants were randomly allocated to receive tVNS or sham stimulation concurrently with each CS presentation...
July 8, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28719739/graphene-electronic-tattoo-sensors
#7
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics owing to their thinness and softness. While most of them are based on thin metal films, silicon membrane, or nanoparticle-based printable inks, we report a sub-micron thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed with filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ~85%, and a stretchability of more than 40%...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719094/discovery-and-characterization-of-a-novel-tryptophan-hydroxylase-1-inhibitor-as-a-prodrug
#8
Hailong Shi, Yaya Cui, Yifei Qin
Serotonin (5-HT) is an important neurotransmitter and paracrine signaling molecule in the gastrointestinal tract. Two distinct tryptophan hydroxylases (TPH), TPH1 and TPH2 are the rate-limiting enzymes in the 5-HT biosynthesis process. TPH1 expression is mainly limited in the enterochromaffin cells and distributed in peripheries such as the skin and gut, while TPH2 is the predominant isoform in the CNS. In this study, mol002291 was screened as a drug-like compound from the TCM database for the inhibitor of TPH...
July 18, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28718344/knee-extensor-fatigue-developed-during-high-intensity-exercise-limits-lower-limb-power-production
#9
Steven J O'bryan, François Billaut, Janet L Taylor, David M Rouffet
We investigated the association between changes in vastii electromyography (EMG) and knee extensor fatigue during high-intensity cycling, and the subsequent effect on lower-limb power and intermuscular coordination during all-out cycling. On two separate days, participants completed 30-s all-out cycling or 10-min of high-intensity cycling followed by 30-s all-out cycling. EMG for gluteus maximus (GMAX), rectus femoris (RF), vastii (VAS), hamstrings (HAM) and gastrocnemius (GAS); co-activation for GMAX/RF, VAS/HAM and VAS/GAS; isometric maximal voluntary force (IMVF) and resting twitch (RT) of the knee extensors were measured...
July 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28717355/correlation-of-creatine-kinase-levels-with-clinical-features-and-survival-in-amyotrophic-lateral-sclerosis
#10
Hongfei Tai, Liying Cui, Yuzhou Guan, Mingsheng Liu, Xiaoguang Li, Dongchao Shen, Dawei Li, Bo Cui, Jia Fang, Qingyun Ding, Kang Zhang, Shuangwu Liu
OBJECTIVE: To evaluate serum creatine kinase (CK) levels of amyotrophic lateral sclerosis (ALS) patients and to explore the relationship between CK levels and the clinical characteristics and survival prognosis of ALS patients. METHODS: We analyzed the CK levels of 185 ALS patients who underwent long-term follow-up. The relationship between CK levels and clinical features including sex, age, disease duration, site of onset, body mass index (BMI), serum creatinine (Cr), and spontaneous electromyographic activity was analyzed by univariate analysis and multiple linear regression...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28716538/reliability-of-pelvic-floor-muscle-electromyography-tested-on-healthy-women-and-women-with-pelvic-floor-muscle-dysfunction
#11
Irene Koenig, Helena Luginbuehl, Lorenz Radlinger
OBJECTIVES: Electromyography (EMG) is a well-established method to quantify the relative pelvic floor muscle (PFM) activity. PFM EMG has shown good reliability in healthy women. However, its reliability has not been tested in women with PFM dysfunction. The reliability of EMG analysis methods concerning EMG normalization needs to be determined to assess specific therapeutic interventions. Therefore, the aim of this study was to investigate the intra-session reliability of PFM EMG variables by using 3 different analysis methods in women with PFM dysfunction...
July 14, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28715964/uterine-and-abdominal-muscle-electromyographic-activities-in-control-and-pcea-treated-nulliparous-women-during-the-second-stage-of-labor
#12
Xueya Qian, Pin Li, Shao-Qing Shi, Robert E Garfield, Huishu Liu
OBJECTIVE: Patient-controlled epidural analgesia (PCEA), used to relieve pain during delivery, delays labor but the mechanism is unknown. The aim was to investigate the effects of PCEA on uterine and abdominal muscles electromyographic (EMG) activity during the second stage of labor. METHODS: This study included 45 nulliparous pregnant women without PCEA, 42 women with standard PCEA treatment given during the first stage of labor and stopped near the end of the first stage, and 22 women with standard PCEA treatment with continued use throughout the first and second stages of labor...
August 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28715712/propriospinal-cutaneous-induced-emg-suppression-is-unaltered-by-anodal-tdcs-of-healthy-motor-cortex
#13
Alana B McCambridge, James W Stinear, Sarah Peek, Winston D Byblow
OBJECTIVE: Cervical propriospinal premotoneurons (PN) relay descending motor commands and integrate peripheral afferent feedback. Effects of anodal transcranial direct current stimulation (a-tDCS) on propriospinal excitability in the upper limbs are unknown. METHODS: Healthy right-handed adults received a-tDCS or sham tDCS over primary motor cortex (M1) at 1mA (Experiment 1, n=18) or 2mA current intensity (Experiment 2, n=15). Propriospinal excitability was assessed by suppression of background electromyography (EMG) in extensor carpi radialis (ECR) from electrical stimulation of the superficial radial nerve during bilateral (Experiment 1 and 2) or unilateral (Experiment 2 only) activation of the left and/or right ECR...
June 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28715432/an-efficacy-analysis-of-whole-body-magnetic-resonance-imaging-in-the-diagnosis-and-follow-up-of-polymyositis-and-dermatomyositis
#14
Zhen-Guo Huang, Bao-Xiang Gao, He Chen, Min-Xing Yang, Xiao-Liang Chen, Ran Yan, Xin Lu, Kai-Ning Shi, Queenie Chan, Guo-Chun Wang
OBJECTIVES: To evaluate the value of whole-body magnetic resonance imaging (WBMRI) in diagnosing muscular and extra muscular lesions in patients with polymyositis (PM) and dermatomyositis (DM). METHODS: A retrospective analysis of WBMRI data from PM/DM patients who met the Bohan and Peter diagnostic criteria was performed. X2 test was used to compare the rate of positive diagnosis of newly diagnosed patients using WBMRI, serum creatine kinase test, and EMG. McNemar test was used to compare the performance of WBMRI and chest CT in detecting interstitial lung disease (ILD)...
2017: PloS One
https://www.readbyqxmd.com/read/28715304/influence-of-stretching-velocity-on-musculotendinous-stiffness-of-the-hamstrings-during-passive-straight-leg-raise-assessments
#15
Ty B Palmer, Nathaniel D M Jenkins, Brennan J Thompson, Joel T Cramer
BACKGROUND: Recently, passive musculotendinous stiffness (MTS) has been assessed manually in the field; however, when conducting these types of assessments, the stretching velocity must be controlled to avoid eliciting the stretch reflex, which can be observed by increased electromyographic (EMG) amplitude of the stretched muscles and greater resistive torque (indicating the assessment is no longer passive). OBJECTIVE: To examine the effects of slow, medium, and fast stretching velocities during manually-applied passive straight-leg raise (SLR) assessments on hamstrings MTS and EMG amplitude characteristics...
August 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28714749/the-influence-of-verbal-and-tactile-feedback-on-electromyographic-amplitude-of-the-shoulder-musculature-during-common-therapeutic-exercises
#16
Sean A Jones, Derek N Pamukoff, Timothy C Mauntel, J Troy Blackburn, Joseph B Myers
CONTEXT: Verbal and tactile feedback during rehabilitation exercises can improve muscle activation, thus improving the therapeutic benefits. However, it is unclear which feedback method elicits the greatest electromyographic (EMG) amplitude. OBJECTIVE: To determine if the addition of tactile to verbal feedback increases EMG amplitude of selected shoulder musculature during scapular plane elevation (Y's), shoulder horizontal abduction with external rotation (T's), and scapular retraction with external rotation (W's)...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28713811/reducing-the-impact-of-shoulder-abduction-loading-on-the-classification-of-hand-opening-and-grasping-in-individuals-with-poststroke-flexion-synergy
#17
Yiyun Lan, Jun Yao, Julius P A Dewald
Application of neural machine interface in individuals with chronic hemiparetic stroke is regarded as a great challenge, especially for classification of the hand opening and grasping during a functional upper extremity movement such as reach-to-grasp. The overall accuracy of classifying hand movements, while actively lifting the paretic arm, is subject to a significant reduction compared to the accuracy when the arm is fully supported. Such a reduction is believed to be due to the expression of flexion synergy, which couples shoulder abduction (SABD) with elbow/wrist and finger flexion, and is common in up to 60% of the stroke population...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28713810/a-biomechanical-comparison-of-proportional-electromyography-control-to-biological-torque-control-using-a-powered-hip-exoskeleton
#18
Aaron J Young, Hannah Gannon, Daniel P Ferris
BACKGROUND: Despite a large increase in robotic exoskeleton research, there are few studies that have examined human performance with different control strategies on the same exoskeleton device. Direct comparison studies are needed to determine how users respond to different types of control. The purpose of this study was to compare user performance using a robotic hip exoskeleton with two different controllers: a controller that targeted a biological hip torque profile and a proportional myoelectric controller...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28713459/the-effects-of-bench-press-variations-in-competitive-athletes-on-muscle-activity-and-performance
#19
Atle Hole Saeterbakken, Dag-André Mo, Suzanne Scott, Vidar Andersen
The aim of the study was to compare the EMG activity performing 6RM competition style bench press (flat bench-wide grip) with 1) medium and narrow grip widths on a flat bench and 1) inclined and declined bench positions with a wide grip. Twelve bench press athletes competing at national and international level participated in the study. EMG activity was measured in the pectoralis major, anterior and posterior deltoid, biceps brachii, triceps brachii and latissimus dorsi. Non-significant differences in activation were observed between the three bench positions with the exception of 58...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713231/grip-force-and-3d-push-pull-force-estimation-based-on-semg-and-grnn
#20
Changcheng Wu, Hong Zeng, Aiguo Song, Baoguo Xu
The estimation of the grip force and the 3D push-pull force (push and pull force in the three dimension space) from the electromyogram (EMG) signal is of great importance in the dexterous control of the EMG prosthetic hand. In this paper, an action force estimation method which is based on the eight channels of the surface EMG (sEMG) and the Generalized Regression Neural Network (GRNN) is proposed to meet the requirements of the force control of the intelligent EMG prosthetic hand. Firstly, the experimental platform, the acquisition of the sEMG, the feature extraction of the sEMG and the construction of GRNN are described...
2017: Frontiers in Neuroscience
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