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Seyyedeh Maryam Khoddami, Saeed Talebian, Farzad Izadi, Noureddin Nakhostin Ansari
OBJECTIVE: The study aims to evaluate the reliability and the discriminative validity of surface electromyography (sEMG) in the assessment of patients with primary muscle tension dysphonia (MTD). STUDY DESIGN: The study design is cross-sectional. METHODS: Fifteen patients with primary MTD (mean age: 34.07 ± 10.99 years) and 15 healthy volunteers (mean age: 34.53 ± 10.63 years) were included. All participants underwent evaluation of sEMG to record the electrical activity of the thyrohyoid and cricothyroid muscles...
October 11, 2016: Journal of Voice: Official Journal of the Voice Foundation
Lorenz Kahl, Ulrich G Hofmann
This work compared the performance of six different fatigue detection algorithms quantifying muscle fatigue based on electromyographic signals. Surface electromyography (sEMG) was obtained by an experiment from upper arm contractions at three different load levels from twelve volunteers. Fatigue detection algorithms mean frequency (MNF), spectral moments ratio (SMR), the wavelet method WIRM1551, sample entropy (SampEn), fuzzy approximate entropy (fApEn) and recurrence quantification analysis (RQA%DET) were calculated...
October 7, 2016: Medical Engineering & Physics
Chengjun Huang, Xiang Chen, Shuai Cao, Xu Zhang
OBJECTIVE: Some skeletal muscles can be subdivided into smaller segments called muscle-tendon units (MTUs). The purpose of this paper is to propose a framework to locate the active region of the corresponding MTUs within a single skeletal muscle and to analyze the activation level varieties of different MTUs during a dynamic motion task. APPROACH: Biceps brachii and gastrocnemius were selected as targeted muscles and three dynamic motion tasks were designed and studied...
October 5, 2016: Journal of Neural Engineering
Corey T Gatewood, Andrew A Tran, Jason L Dragoo
PURPOSE: There is a wide array of device modalities available for post-operative treatment following arthroscopic knee surgery; however, it remains unclear which types and duration of modality are the most effective. This systematic review aimed to investigate the efficacy of device modalities used following arthroscopic knee surgery. METHODS: A systematic search of the literature was performed on: PubMed; Scopus; MEDLINE; EMBASE; PEDro; SportDiscus; and CINAHL databases (1995-2015) for clinical trials using device modalities following arthroscopic knee surgery: cryotherapy, continuous passive motion (CPM), neuromuscular electrical stimulation (NMES), surface electromyographic (sEMG) biofeedback and shockwave therapy (ESWT)...
October 1, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Dannuey M Cardoso, Guilherme A F Fregonezi, Renan T Jost, Ricardo Gass, Cristine L Alberton, Isabella M Albuquerque, Dulciane N Paiva, Sérgio S M Barreto
Objective: To investigate the acute effects of EPAP on the activity of sternocleidomastoid (SCM), parasternal muscles and ventilatory parameters in COPD patients. Method: Twenty-four patients with COPD were studied using surface electromyography (sEMG) and a ventilometer. Patients were randomly assigned to EPAP 10 cmH2O-EPAP10 or 15 cmH2O-EPAP15 for 20 minutes. Results: The parasternal muscle sEMG activity increased during EPAP10 and EPAP15; however, a greater and significant increase was observed with EPAP10 (mean between-group difference: 12...
September 16, 2016: Brazilian Journal of Physical Therapy
Paulo Gentil, James Fisher, James Steele
Resistance exercises can be considered to be multi-joint (MJ) or single-joint (SJ) in nature. Many strength coaches, trainers, and trainees believe that adding SJ exercises to a resistance training (RT) program may be required to optimize muscular size and strength. However, given that lack of time is a frequently cited barrier to exercise adoption, the time commitment resulting from these recommendations may not be convenient for many people. Therefore, it is important to find strategies that reduce the time commitment without negatively affecting results...
September 27, 2016: Sports Medicine
Déborah de Araújo Farias, Jeffrey M Willardson, Gabriel A Paz, Ewertton de S Bezerra, Humberto Miranda
The purpose of this study was to investigate muscle activation, total repetitions and training volume for three bench press exercise modes [Smith machine (SMBP), barbell (BBP), and dumbbell (DBP)] that were followed by a triceps extension (TE) exercise. Nineteen trained men performed three testing protocols in random order, which included: P1) SMBP + TE; P2) BBP + TE; P3) DBP + TE. Each protocol involved four sets with a 10RM load, immediately followed by a triceps extension exercise that was also performed for four sets with a 10RM load...
September 21, 2016: Journal of Strength and Conditioning Research
S S Mostafa, M A Awal, M Ahmad, M A Rashid
Some people cannot produce sound although their facial muscles work properly due to having problem in their vocal cords. Therefore, recognition of alphabets as well as sentences uttered by these voiceless people is a complex task. This paper proposes a novel method to solve this problem using non-invasive surface Electromyogram (sEMG). Firstly, eleven Bangla vowels are pronounced and sEMG signals are recorded at the same time. Different features are extracted and mRMR feature selection algorithm is then applied to select prominent feature subset from the large feature vector...
2016: SpringerPlus
Sourav Chandra, Mitsuhiro Hayashibe, Asokan Thondiyath, Manickam Ramalingam
BACKGROUND: Fatigue induced hand tremor (FIT) is a primary limiting concern for the prolonged surgical intervention in minimally invasive surgery (MIS) and robot-assisted-minimally invasive surgery (RAMIS). A thorough analysis is necessary to understand the FIT characteristics in laparoscopic tool movement. The primary aim of this study is to perform a differential analysis of the elbow and wrist tremor due to muscle fatigue in laparoscopic manoeuvring. METHODS: We have introduced a joint angle based tremor analysis method, which enables us to perform a differential study of FIT characteristics at the individual joint...
September 20, 2016: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
Melissa M White, Olivia N Morejon, Shijing Liu, Mei Y Lau, Chang S Nam, David B Kaber
Strokes are the leading cause of major adult disability with up to 85% of U.S. survivors experiencing hemiparesis. Physical characteristics of upper-extremity exoskeletal orthotics, used in stroke rehabilitation, were evaluated in terms of performance of activities of daily living (ADL), perceived exertion, and muscle load. Simulated orthotic weight distributions, with total extremity loads of 0.81 kg, 1.25 kg and 2.27 kg, were evaluated along with a 0 kg control condition. Response measures included average shoulder/elbow muscle surface electromyography (sEMG) signal amplitude, quality of task completion and total rest time during performance, and Borg CR-10 scale ratings...
January 2017: Applied Ergonomics
Renan Lima Monteiro, Joana Hoverter Facchini, Diego Galace de Freitas, Bianca Callegaric, Sílvia Maria Amado João
Pelvic drop exercises are often used to strengthen the gluteus medius muscle with the aim of increasing or prioritizing its recruitment. However, the effect of hip rotation on the performance of the action of the gluteus medius is unknown. The aim of the study was to evaluate the effect of hip rotation on the recruitment of the gluteus medius muscle, tensor fasciae latae and quadratus lumborum. Seventeen healthy subjects performed two sets of four repetitions of pelvic drop exercise in random order with lateral (PDLR), medial (PDMR) and neutral (PDN) rotation of the hip...
August 24, 2016: Journal of Sport Rehabilitation
Fabiola Spolaor, Zimi Sawacha, Gabriella Guarneri, Silvia Del Din, Angelo Avogaro, Claudio Cobelli
Diabetic peripheral neuropathy (DPN) causes motor control alterations during daily life activities. Tripping during walking or stair climbing is the predominant cause of falls in the elderly subjects with DPN and without (NoDPN). Surface Electromyography (sEMG) has been shown to be a valid tool for detecting alterations of motor functions in subjects with DPN. This study aims at investigating the presence of functional alterations in diabetic subjects during stair climbing and at exploring the relationship between altered muscle activation and temporal parameter...
August 20, 2016: Journal of Electromyography and Kinesiology
Guillaume Gaudet, Maxime Raison, Fabien Dal Maso, Sofiane Achiche, Mickael Begon
The aim of this study is to determine the intra- and inter-session reliability of non-normalized surface electromyography (sEMG) on the muscles actuating the forearm during maximum voluntary isometric contractions (MVIC). A sub-objective of this study is to determine the intra- and inter-session reliability of forearm MVIC force or torque, which is a prerequisite to assess sEMG reliability. Eighteen healthy adults participated at four different times, namely baseline, 1 h-post, 6 h-post, and 24 h-post. They performed three MVIC trials of forearm flexion, extension, pronation and supination...
September 6, 2016: Journal of Applied Biomechanics
Ariba Siddiqi, Sridhar Poosapadi Arjunan, Dinesh Kant Kumar
Age-related neuromuscular change of Tibialis Anterior (TA) is a leading cause of muscle strength decline among the elderly. This study has established the baseline for age-associated changes in sEMG of TA at different levels of voluntary contraction. We have investigated the use of Gaussianity and maximal power of the power spectral density (PSD) as suitable features to identify age-associated changes in the surface electromyogram (sEMG). Eighteen younger (20-30 years) and 18 older (60-85 years) cohorts completed two trials of isometric dorsiflexion at four different force levels between 10% and 50% of the maximal voluntary contraction...
2016: BioMed Research International
Markus Nowak, Claudio Castellini
Simultaneous and proportional myocontrol of dexterous hand prostheses is to a large extent still an open problem. With the advent of commercially and clinically available multi-fingered hand prostheses there are now more independent degrees of freedom (DOFs) in prostheses than can be effectively controlled using surface electromyography (sEMG), the current standard human-machine interface for hand amputees. In particular, it is uncertain, whether several DOFs can be controlled simultaneously and proportionally by exclusively calibrating the intended activation of single DOFs...
2016: PloS One
Shengyun Liang, Jiali Xu, Lei Wang, Guoru Zhao
To date, most studies use surface electromyographic (sEMG) signals as the control source on active rehabilitation robots, and unilateral data are collected based on the gait symmetry hypothesis, which has caused much controversy. The purpose of this study is to quantitatively evaluate the sEMG activity asymmetry of bilateral muscles in lower extremities during functional tasks. Nine participants were instructed to perform static and dynamic steady state tests. sEMG signals from the tibialis anterior, soleus, medial gastrocnemius and lateral gastrocnemius muscles of bilateral lower extremities were recorded in the experiments...
2016: PeerJ
Ling Jia, Yun Wang, Mengya Wang
OBJECTIVE: To analyze characteristics of mandibular movement in patients with unilateral mastication.
 METHODS: Undergraduate students in oral medicine from Grade 2011 and 2012 in Wannan Medical College were enrolled for this study by cluster sampling method, which include 30 people with unilateral mastication and 30 people with bilateral mastication. The surface electromyogram (sEMG) of masseter muscle and anterovent of digastric muscle were recorded and the trajectory of mandibular incisor point was recorded simultaneously in the maximum opening and closing movement...
August 2016: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
Andrea Mapelli, Bárbara Cristina Zanandréa Machado, Lucia Dantas Giglio, Chiarella Sforza, Cláudia Maria De Felício
OBJECTIVE: To investigate whether reorganization of muscle activity occurs in patients with chronic temporomandibular disorders (TMD) and, if so, how it is affected by symptomatology severity. METHODS: Surface electromyography (sEMG) of masticatory muscles was made in 30 chronic TMD patients, diagnosed with disc displacement with reduction (DDR) and pain. Two 15-patient subgroups, with moderate (TMDmo) and severe (TMDse) signs and symptoms, were compared with a control group of 15 healthy subjects matched by age...
August 24, 2016: Archives of Oral Biology
E Zaretsky, P Pluschinski, R Sader, P Birkholz, C Neuschaefer-Rube, Christiane Hey
Surface electromyography (sEMG) is a well-established procedure for recording swallowing-related muscle activities. Because the use of a large number of sEMG channels is time consuming and technically sophisticated, the aim of this study was to identify the most significant electrode positions associated with oropharyngeal swallowing activities. Healthy subjects (N = 16) were tested with a total of 42 channels placed in M. masseter, M. orbicularis oris, submental and paralaryngeal regions. Each test subject swallowed 10 ml of water five times...
August 31, 2016: European Archives of Oto-rhino-laryngology
Jian Wu, Lu Sun, Roozbeh Jafari
A Sign Language Recognition (SLR) system translates signs performed by deaf individuals into text/speech in real time. Inertial measurement unit (IMU) and surface electromyography (sEMG) are both useful modalities to detect hand/arm gestures. They are able to capture signs and the fusion of these two complementary sensor modalities will enhance system performance. In this paper, a wearable system for recognizing American Sign Language (ASL) in real-time is proposed, fusing information from an inertial sensor and sEMG sensors...
August 25, 2016: IEEE Journal of Biomedical and Health Informatics
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