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Continuous, integrated sensors for predicting fatigue during non-repetitive work: demonstration of technique in the operating room.

Ergonomics 2021 May 11:1-14. Epub 2021 May 11.

School of Industrial Engineering, Purdue University, West Lafayette, IN, USA.

Surface electromyography (sEMG) can monitor muscle activity and potentially predict fatigue in the workplace. However, objectively measuring fatigue is challenging in complex work with unpredictable work cycles where sEMG may be influenced by the dynamically changing posture demands. This study proposes a multi-modal approach integrating sEMG with motion sensors and demonstrates the approach in the live surgical work environment. Read More

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Effect of transcranial direct current stimulation on the psychomotor, cognitive, and motor performances of power athletes.

Sci Rep 2021 May 6;11(1):9731. Epub 2021 May 6.

Service de Psychiatrie de L'Adulte, Centre Hospitalier Universitaire de Besançon, 25030, Besançon Cedex, France.

In sports science, transcranial direct current stimulation (tDCS) has many unknown effects on neuromuscular, psychomotor and cognitive aspects. Particularly, its impact on power performances remains poorly investigated. Eighteen healthy young males, all trained in a jumping sport (parkour) performed three experimental sessions: anodal tDCS applied either on the left dorsolateral prefrontal cortex (dlPFC, cathode in supraorbital area) or on the primary motor cortex (M1, cathode on contralateral shoulder), and a placebo condition (SHAM), each applied for 20 min at 2 mA. Read More

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ANCA-Negative Churg-Strauss Syndrome Presenting as Bilateral Central Retinal Artery Occlusion: A Case Report

Turk J Ophthalmol 2021 04;51(2):127-130

Birjand University of Medical Sciences Valiasr Hospital, Department of Internal Medicine, Birjand, Iran

A 42-year-old man with undiagnosed Churg-Strauss syndrome (CSS) developed bilateral central retinal artery occlusion (CRAO). His medical history included bronchial asthma and irregular prednisolone usage but no atherosclerotic risk factors. At presentation, visual acuity (VA) was hand motion in the right eye and counting fingers in left eye. Read More

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Are occlusal splints effective in reducing myofascial pain in patients with muscle-related temporomandibular disorders? A randomized-controlled trial.

Turk J Phys Med Rehabil 2021 Mar 4;67(1):32-40. Epub 2021 Mar 4.

Department of Surgical Sciences, Dental School, University of Turin, Turin, Italy.

Objectives: This study aims to evaluate the effectiveness of upper Michigan occlusal splint (OS) compared to mandibular OS in terms of pain, range of motion (ROM), and muscle activity as assessed by surface electromyography (sEMG) in patients affected by muscle-related temporomandibular disorders (TMD).

Patients And Methods: In this randomized-controlled trial, a total of 40 adult patients (13 males, 27 females; mean age: 47.2±12. Read More

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Evaluation of trunk muscle activities in response to three breastfeeding positions utilised by women.

J Back Musculoskelet Rehabil 2021 Apr 26. Epub 2021 Apr 26.

School of Health Technology, Oji-River, Enugu State, Nigeria.

Background: High prevalence of breastfeeding (BF)-related musculoskeletal disorders (MSDs) in nursing mothers have been reported in previous studies. Studies are scarce on the biomechanical effects of the commonly utilized BF positions.

Objective: This study evaluated the electromyographic (EMG) activities of the trunk muscles in response to three BF positions commonly utilized by mothers globally. Read More

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The effect of inherent and incidental constraints on bimanual and social coordination.

Exp Brain Res 2021 Apr 30. Epub 2021 Apr 30.

Department of Health and Kinesiology, Texas A&M University, College Station, TX, 77802, USA.

The current investigation was designed to examine the influence of inherent and incidental constraints on the stability characteristics associated with bimanual and social coordination. Individual participants (N = 9) and pairs of participants (N = 18, 9 pairs) were required to rhythmically coordinate patterns of isometric forces in 1:1 in-phase and 1:2 multi-frequency patterns by exerting force with their right and left limbs. Lissajous information was provided to guide performance. Read More

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The Effect of Combined Guidance of Botulinum Toxin Injection with Ultrasound, Catheter Balloon, and Electromyography on Neurogenic Cricopharyngeal Dysfunction: A Prospective Study.

Dysphagia 2021 Apr 29. Epub 2021 Apr 29.

Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-Sen University, 600 Tianhe Road, Guangzhou, 510630, Guangdong Province, China.

Background: Cricopharyngeal botulinum toxin (BTX) injection is one of the treatments for neurogenic cricopharyngeal dysfunction (CPD). We conducted this prospective study to investigate the effect and safety of BTX injection for neurogenic CPD with a novel guidance.

Methods: Twenty-one patients with neurogenic CPD whose symptoms did not reduce after conventional swallowing therapy were included in this study. Read More

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Novel Functional Indices of Masticatory Muscle Activity.

J Clin Med 2021 Apr 1;10(7). Epub 2021 Apr 1.

Department of Sports Medicine, Medical University of Lublin, 20-093 Lublin, Poland.

The aim of the present study was to analyze novel functional indices of masticatory muscle activity and compare them to existing and commonly used indices in patients with temporomandibular disorders (TMDs) and healthy adults. Based on the Research Diagnostic Criteria for Temporomandibular Disorders, 78 adult women qualified for the study. Subjects were divided into two groups: diagnosed TMDs ( = 36; mean age: 23. Read More

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[Brachial plexus damage following coronary artery bypass graft surgery].

Agri 2021 Apr;33(2):122-123

Department of Physical Medicine and Rehabilitation, Malatya Training and Research Hospital, Malatya, Turkey.

Brachial plexus injury is a complication that can be seen after coronary artery bypass grafting (CABG), especially median sternotomy. Brachial plexus injury was detected by clinical, examination, and electromyography in the presence of pain in the left arm who underwent CABG operation about 3 months ago. Our case was diagnosed early and improved with appropriate treatment. Read More

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Left-right side-specific neuropeptide mechanism mediates contralateral responses to a unilateral brain injury.

eNeuro 2021 Apr 26. Epub 2021 Apr 26.

Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden

Neuropeptides are implicated in control of lateralized processes in the brain. A unilateral brain injury (UBI) causes the contra- and ipsilesional side-specific postural and sensorimotor deficits. To examine whether opioid neuropeptides mediate UBI induced asymmetric processes we compared effects of opioid antagonists on the contra- and ipsilesional hindlimb responses to the left- and right-sided injury in rats. Read More

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The impact of forward head posture on the electromyographic activity of the spinal muscles.

J Taibah Univ Med Sci 2021 Apr 16;16(2):224-230. Epub 2020 Dec 16.

Department of Physical Therapy, College of Applied Medical Sciences, Imam Abdulrahman Bin Faisal University, KSA.

Objective: This study aims to examine the electromyographic activity of the regional spinal muscle between patients with forward head posture (FHP) and those with a normal cranio-vertebral (CV) angle.

Methods: We recruited 60 adult women aged between 18 and 29 years from a single institution. The CV angle was measured in the sagittal plane, which helped us to assign the participants in the FHP group (n = 30) with a large CV angle (53. Read More

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Complete laceration of motor branches of facial nerve and its successful repair: A case report from Afghanistan.

Int J Surg Case Rep 2021 Apr 26;81:105839. Epub 2021 Mar 26.

Medical Research Center, Kateb University, Kabul, Afghanistan. Electronic address:

Introduction: Facial nerve (the seventh cranial nerve) injury causes functional, aesthetic, and psychological difficulties. The second most common cause of facial nerve palsy is trauma.

Presentation Of Cases: A previously healthy 21-year-old worker, was brought to emergency room after car accident, with complete paralysis of all muscles of the left side of his face. Read More

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[Clinical outcomes of vocal fold immobility after tracheal intubation].

Beijing Da Xue Xue Bao Yi Xue Ban 2020 Sep;53(2):337-340

Department of Anesthesiology, First Hospital, Peking University, Beijing 100034, China.

Objective: To assess the incidence of postoperative vocal cord immobility in patients following endotracheal intubation underwent general anesthesia.

Methods: We retrospectively enrolled patients who underwent surgical procedures with endotracheal intubation under general anesthesia from January 2014 to December 2018 in Peking University First Hospital. Demographic and treatment data were obtained for patients with hoarseness and vocal cord fixation. Read More

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September 2020

The Effects of the Traditional Scaling Technique Versus a Modified Scaling Technique on Muscle Activity and Pinch Force Generation: A pilot study.

J Dent Hyg 2021 Apr;95(2):6-13

Department of Exercise and Sport Science at the University of North Carolina, Chapel Hill, NC, USA.

Dental hygienists perform precision instrumentation tasks repetitively throughout the workday, placing them at increased risk for developing a musculoskeletal disorder. The purpose of this pilot study was to determine differences in muscle activity and pinch force generation between the traditional scaling technique and a modified scaling technique. A convenience sample of dental hygienists (n=12) acted as their own controls in this counterbalance-designed pilot study. Read More

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Electromyographic Evaluation of Masticatory Muscles in a Young Patient with Crossbite Treated with Rapid Palatal Expander: A Case Report.

J Contemp Dent Pract 2020 Nov 1;21(11):1279-1283. Epub 2020 Nov 1.

Department of Surgery and Medicine, University of Milano Bicocca, Ospedale San Gerardo, Monza, Italy, Phone: +39 392333485, e-mail:

Aim And Objective: The purpose of this work is to investigate by electromyographic (EMG) surface analysis whether and how the variations in the occlusion due to the correction of the posterior crossbite using a rapid palatal expander (RPE) is accompanied by changes in the activity of the elevator muscles in the pediatric patients.

Background: Posterior crossbite is a disgnathic jaw relationship common in patients undergoing growth. In the last 10 years, several studies demonstrated the effectiveness and reproducibility of surface EMG in the objective evaluation of temporal muscle and masseter activity and how this evidence can be an interesting aid in dental clinical practice. Read More

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November 2020

Wrist-hand extension function recovery in spastic hemiplegia patient by botulinum toxin injection plus surface electromyography biofeedback therapy: A case report.

Medicine (Baltimore) 2021 Apr;100(14):e25252

Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Affiliated Hospital of Guangdong Medical University.

Rationale: Wrist-hand extension function rehabilitation is a vital and difficult part of hand function recovery in spastic stroke patients. Although botulinum toxin type A (BoNTA) injection plus post injection therapy was applied to the wrist-hand rehabilitation in previous reports, conclusion was inconsistent in promoting function. For this phenomenon, proper selection of patients for BoNTA injection and correct choice of post-injection intervention could be the crucial factors for the function recovery. Read More

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Muscle activation time and free-throw effectiveness in basketball.

Sci Rep 2021 Apr 5;11(1):7489. Epub 2021 Apr 5.

Faculty of Physical Education and Physiotherapy, Opole University of Technology, 45-758, Opole, Poland.

This study attempts to analyze the relationship between free-throw efficiency and the time of arm muscle activation in players from 3 basketball teams with different levels of experience was investigated. During the experiment each player made 20 free throws during which the activation time of his right and left biceps and triceps brachii muscles were measured with the use of surface electromyography and high-speed cameras. Significant differences in muscle activation time (t) during a free throw were found between the groups of basketball players (p = 0. Read More

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Characterization of Pelvic Floor Activity in Healthy Subjects and with Chronic Pelvic Pain: Diagnostic Potential of Surface Electromyography.

Sensors (Basel) 2021 Mar 23;21(6). Epub 2021 Mar 23.

Centro de Investigación e Innovación en Bioingeniería, Universitat Politècnica de València, 46022 Valencia, Spain.

Chronic pelvic pain (CPP) is a highly disabling disorder in women usually associated with hypertonic dysfunction of the pelvic floor musculature (PFM). The literature on the subject is not conclusive about the diagnostic potential of surface electromyography (sEMG), which could be due to poor signal characterization. In this study, we characterized the PFM activity of three groups of 24 subjects each: CPP patients with deep dyspareunia associated with a myofascial syndrome (CPP group), healthy women over 35 and/or parous (>35/P group, i. Read More

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A Rare Case of Tibial Intraneural Ganglion Cyst Arising From the Tibiofibular Joint.

Cureus 2021 Feb 26;13(2):e13570. Epub 2021 Feb 26.

Family Medicine, Des Moines University, Des Moines, USA.

Intraneural ganglion cysts are a rare occurrence. They are most commonly found originating from the common peroneal nerve but are also frequently reported on the radial, ulnar, median, sciatic, tibial, and posterior interosseous nerves. A typical clinical presentation is posterior knee and calf pain resulting from tibial neuropathy with preferential degeneration of the popliteus muscle. Read More

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February 2021

Effect of fatigue on muscle latency, muscle activation and perceived discomfort when exposed to whole-body vibration.

Ergonomics 2021 Apr 30:1-16. Epub 2021 Apr 30.

School of Engineering, University of Guelph, Guelph, Canada.

Whole-body vibration and muscle fatigue have both been shown to delay the trunk muscle reflex response and increase trunk muscle activation, leading to an increased risk of low back injuries. However, the effects of whole-body vibration on previously fatigued trunk muscles have never been tested, despite studies showing that prolonged exposure to whole-body vibration can lead to muscle fatigue. The purpose of this research was to investigate the effects of muscle fatigue on muscle latency, muscle activation and perceived discomfort when exposed to whole-body vibration. Read More

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Postoperative lumbar paraspinal compartment syndrome.

BMJ Case Rep 2021 Mar 29;14(3). Epub 2021 Mar 29.

Department of Neurology, University of Chicago, Chicago, Illinois, USA

Lower lumbar paraspinal muscles constitute a compartment as they are surrounded by distinct fascial and bony boundaries. Lumbar paraspinal compartment syndrome is a rare entity, often caused by intense exercise, but also can be a postoperative complication. We present a 60-year-old man with low back pain, numbness in the left lower back and radicular pain in the left lower extremity, which started after a surgery that involved prolonged positioning on the left side 7 years before, and persisted to the day of evaluation. Read More

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Altered Vestibular Balance Function in Combat Sport Athletes.

J Neurotrauma 2021 Mar 23. Epub 2021 Mar 23.

University of Calgary, 2129, Faculty of Kinesiology, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4;

Combat sports pose a risk for accumulative injuries to the nervous system, yet fighters have remained an understudied population. Here our purpose was to determine whether repetitive blows to the head have an effect on vestibular balance reflexes in combat sports athletes. We compared lower-limb muscle responses evoked with electrical vestibular stimuluation (EVS) between fighters (boxing/muay thai) and non-fighter controls. Read More

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Anterior shin muscles CMAP measurements: Normal limits of symmetry and intra- and interobserver reliability.

Clin Neurophysiol Pract 2021 15;6:93-96. Epub 2021 Feb 15.

Department of Physical Medicine and Rehabilitation, ZNA Middelheim, Antwerp, Belgium.

Objective: The normal limits of symmetry for the compound muscle action potential of the shin muscles (CMAPshin) have not been determined yet. The goal of this study is to provide extensive data on the limits of symmetry and the reliability of CMAPshin.

Methods: The study was conducted in normal healthy males and females. Read More

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February 2021

The immediate effect of whole-body vibration on rectus abdominis muscle activity and cutaneous temperature: A randomized controlled trial.

J Bodyw Mov Ther 2021 Jan 27;25:46-52. Epub 2020 Oct 27.

Physical Therapy Department, Federal University of Paraíba, João Pessoa, Brazil. Electronic address:

Objectives: To compare acute effects of isometric abdominal exercises performed with or without vibration on the electromyographic activity and cutaneous temperature in the abdominal region of physically active individuals.

Methods: A randomized controlled crossover clinical trial was undertaken in thirty volunteers who completed one unique session of two different protocols of interventions apart from a week from each other, in a two-week study protocol. The subjects were randomly divided in to two groups of 15 volunteers; both were assigned to perform board exercise (30 s on the front, right and left lateral boards, with a rest interval of 2 min). Read More

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January 2021

Electromyographic Comparison of Five Lower-Limb Muscles between Single- and Multi-Joint Exercises among Trained Men.

J Sports Sci Med 2021 03 1;20(1):56-61. Epub 2021 Mar 1.

Faculty of Education, Arts and Sports, Western Norway University of Applied Sciences, Norway.

Resistance-training exercises can be classified as either single- or multi-joint exercises and differences in surface electromyography (EMG) amplitude between the two training methods may identify which muscles can benefit from either training modality. This study aimed to compare the surface EMG amplitude of five hip- and knee extensors during one multi-joint (leg press) and two single-joint exercises (knee extension and kickback). Fifteen resistance-trained men completed one familiarization session to determine their unilateral six repetitions maximum (6RM) in the three exercises. Read More

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Female kinematics and muscle responses in lane change and lane change with braking maneuvers.

Traffic Inj Prev 2021 10;22(3):236-241. Epub 2021 Mar 10.

Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden.

Objective: The primary aim of this article is to extensively study female occupant kinematics and muscle activations in vehicle maneuvers potentially occurring in precrash situations and with different seat belt configurations. The secondary aim is to provide validation data for active human body models (AHBMs) of female occupants in representative precrash loading situations.

Methods: Front seat female passengers wearing a 3-point seat belt, with either standard or pre-pretensioning functionality, were subjected to multiple autonomously carried-out lane change and lane change with braking maneuvers while traveling at 73 km/h. Read More

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Abnormal Gray Matter Volume and Functional Connectivity in Parkinson's Disease with Rapid Eye Movement Sleep Behavior Disorder.

Parkinsons Dis 2021 22;2021:8851027. Epub 2021 Feb 22.

Department of Geriatrics, Nanjing Brain Hospital Affiliated to Nanjing Medical University, Nanjing, China.

Objective: Rapid eye movement (REM) sleep behavior disorder (RBD) is a common symptom in Parkinson's disease (PD), and patients with PD-RBD tend to have an increased risk of cognitive decline and have the tendency to be akinetic/rigidity predominant. At the same time, the mechanisms of RBD in patients with PD remain unclear. Therefore, this study aimed to detect the structural and functional differences in patients with PD-RBD and PD without RBD (PD-nRBD). Read More

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February 2021

Scapular winging secondary to serratus anterior dysfunction: analysis of clinical presentations and etiology in a consecutive series of 96 patients.

J Shoulder Elbow Surg 2021 Mar 4. Epub 2021 Mar 4.

Department of Orthopaedics, University Hospitals Birmingham, Birmingham, UK.

Background: This study aimed to establish the relative incidence of etiologies causing serratus anterior (SA) dysfunction in patients with proven abnormality on needle electromyography.

Methods: This was a retrospective review of patients with scapular winging secondary to SA dysfunction. Each patient underwent a detailed clinical, radiological, and neurophysiological assessment to arrive at the precise etiological diagnosis. Read More

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Resistance training with different repetition duration to failure: effect on hypertrophy, strength and muscle activation.

PeerJ 2021 25;9:e10909. Epub 2021 Feb 25.

Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Background: This study investigated the effects of two 14-week resistance training protocols with different repetition duration (RD) performed to muscle failure (MF) on gains in strength and muscle hypertrophy as well as on normalized electromyographic (EMG) amplitude and force-angle relationships.

Methods: The left and right legs of ten untrained males were assigned to either one of the two protocols (2-s or 6-s RD) incorporating unilateral knee extension exercise. Both protocols were performed with 3-4 sets, 50-60% of the one-repetition maximum (1RM), and 3 min rest. Read More

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February 2021

"Anterior interosseous nerve syndrome (Kiloh Nevin Syndrome) revealing Gantzer muscle and simultaneous myasthenia gravis".

Radiol Case Rep 2021 Apr 16;16(4):983-988. Epub 2021 Feb 16.

Centro Médico Vista del Jardin, Santo Domingo, Dominican Republic.

There hasn't been a previous case report of the anterior interosseous nerve injury secondary to the presence of the muscle of Gantzer in a patient with myasthenia gravis in literature before. The anterior interosseous nerve compressive syndrome, also known as Kiloh-Nevin syndrome, is a rare disorder comprising less than 1% of all upper limb neuropathies. Establishing the etiology of anterior interosseous nerve compressive syndrome is challenging because of the lack of specific clinical findings or testing. Read More

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