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Standards for Reporting EMG Data
(Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - June 19, 2015 Category: Neurology Source Type: research

Characterization of ankle dorsiflexors performance in healthy subjects following maximal-intensity isokinetic resistance training
The purpose of this randomized trial was to examine, in healthy subjects, the effect of unilateral isokinetic-concentric training of the dominant ankle dorsiflexors (DF) on the peak moment (PM), mean PM (MPM), maximal work and mean work (meanW).Thirty volunteers (26.7±4.6 years old) underwent bilateral isokinetic testing of ankle DF at 45 and 90°/s. Participants were randomly assigned to a control or a training group. The training lasted 4 weeks (4-day/week).All dynamometric parameters increased significantly only in the training group for the trained leg (p (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - June 17, 2015 Category: Neurology Authors: A. Manca, G. Solinas, D. Dragone, Z. Dvir, F. Deriu Source Type: research

Reproducibility of transcranial magnetic stimulation metrics in the study of proximal upper limb muscles
Reproducibility of transcranial magnetic stimulation (TMS) metrics is essential in accurately tracking recovery and disease. However, majority of evidence pertains to reproducibility of metrics for distal upper limb muscles. We investigate for the first time, reliability of corticospinal physiology for a large proximal muscle-the biceps brachii and relate how varying statistical analyses can influence interpretations. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - June 13, 2015 Category: Neurology Authors: Vishwanath Sankarasubramanian, Sarah Roelle, Corin E. Bonnett, Daniel Janini, Nicole Varnerin, David A. Cunningham, Jennifer S. Sharma, Kelsey A. Potter-Baker, Xiaofeng Wang, Guang H. Yue, Ela B Plow Source Type: research

Testing the Assumption in Ergonomics Software that Overall Shoulder Strength Can Be Accurately Calculated by Treating Orthopedic Axes as Independent
To predict shoulder strength, most current ergonomic software packages assume independence of the strengths about each of the orthopedic axes. Using this independent axis approach (IAA), the shoulder can be predicted to have strengths as high as the resultant of the maximum moment about any two or three axes. We propose that the strength at the shoulder is not independent between axes, and propose an approach that calculates the weighted average (WAA) between the strengths of the axes involved in the demand. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - June 11, 2015 Category: Neurology Authors: Joanne N. Hodder, Nicholas J. La Delfa, Jim R. Potvin Source Type: research

Age-related differences in pelvic and trunk motion and gait adaptability at different walking speeds
This study aimed at investigating age-related changes in gait kinematics and in kinematic adaptations over a wide range of walking velocities. Thirty-four older adults and 14 younger adults walked on a treadmill; the treadmill velocity was gradually increased in increments of 0.2 miles/hour (mph) (1.1-1.9mph) and then decreased in the same increments. Pelvic, trunk, upper limbs and lower limbs angular total ranges of motion (tROM), stride time, stride length, and step width were measured. The older adults had lower pelvic, trunk tROM and shorter strides and stride time compared with the younger adults. (Source: Journal of ...
Source: Journal of Electromyography and Kinesiology - June 3, 2015 Category: Neurology Authors: Yoav Gimmon, Raziel Riemer, Hisham Rashad, Amir Shapiro, Ronen Debi, Ilan Kurz, Itshak Melzer Source Type: research

Adaptations to isolated shoulder fatigue during simulated repetitive work. Part II: Recovery
The shoulder allows kinematic and muscular changes to facilitate continued task performance during prolonged repetitive work. The purpose of this work was to examine changes during simulated repetitive work in response to a fatigue protocol. Participants performed 20 one-minute work cycles comprised of 4 shoulder centric tasks, a fatigue protocol, followed by 60 additional cycles. The fatigue protocol targeted the anterior deltoid and cycled between static and dynamic actions. EMG was collected from 14 upper extremity and back muscles and three-dimensional motion was captured during each work cycle. (Source: Journal of Ele...
Source: Journal of Electromyography and Kinesiology - June 1, 2015 Category: Neurology Authors: Alison C. McDonald, Calvin T.F. Tse, Peter J. Keir Source Type: research

Accuracy of the surface electromyography RMS processing for the diagnosis of myogenous temporomandibular disorder
Due to the multifactor etiology of temporomandibular disorder (TMD), the precise diagnosis remains a matter of debate and validated diagnostic tools are needed. The aim was to determine the accuracy of surface electromyography (sEMG) activity, assessed in the amplitude domain by the root mean square (RMS), in the diagnosis of TMD. One hundred twenty-three volunteers were evaluated using the Research Diagnostic Criteria for Temporomandibular Disorders and distributed into two groups: women with myogenous TMD (n = 80) and women without TMD (n = 43). (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 26, 2015 Category: Neurology Authors: Kelly Cristina dos Santos Berni, Almir Vieira Dibai-Filho, Paulo Fernandes Pires, Delaine Rodrigues-Bigaton Source Type: research

Effects of Body Weight Unloading on Electromyographic Activity during Overground Walking
Body weight unloading (BWU) on treadmills is a common method of gait rehabilitation. However, treadmills slightly but significantly modify gait biomechanical parameters thus confound the effects of BWU. By conducting our experiments under conditions that replicate daily walking and controlling for speed variability, with a mechanical device designed to pull the BWU system at a constant speed, this study could assess the unique effects of BWU on gait electromyography (EMG) of healthy subjects. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 16, 2015 Category: Neurology Authors: Arielle G. Fischer, Eytan M. Debbi, Alon Wolf Source Type: research

Effects of the Innervation Zone on the Time and Frequency Domain Parameters of the Surface Electromyographic Signal
The purposes of the present study were to examine the effects of electrode placements over, proximal, and distal to the innervation zone (IZ) on electromyographic (EMG) amplitude (RMS) and frequency (MPF) responses during: 1) a maximal voluntary isometric contraction (MVIC), and; 2) a sustained, submaximal isometric muscle action. A linear array was used to record EMG signals from the vastus lateralis over the IZ, 30 mm proximal, and 30 mm distal to the IZ during an MVIC and a sustained isometric muscle action of the leg extensors at 50% MVIC. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 15, 2015 Category: Neurology Authors: Cory M. Smith, Terry J. Housh, Trent J. Herda, Jorge M. Zuniga, Eric D. Ryan, Clayton L. Camic, Haley C. Bergstrom, Doug B. Smith, Joseph P. Weir, Joel T. Cramer, Ethan C. Hill, Kristen C. Cochrane, Nathaniel D.M. Jenkins, Richard J. Schmidt, Glen O. John Source Type: research

A preliminary investigation of reproducibility of EMG signals during daytime masticatory muscle activity using a portable EMG logging device
Continuous parafunctional masseter muscle activities (MMA) that are associated with daytime bruxism have been suspected to be one of the main pathoetiology for orofacial pain. The purpose of this study was to examine the long-term stability and reliability of daytime EMG measurement of MMA using a portable device (Actiwave; CamNtech Ltd). Daytime masseter muscle EMG of five subjects were recorded for four days in their normal living environment. There was no significant time dependent effect on EMG amplitude during recording period. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 14, 2015 Category: Neurology Authors: Katsuhiro Omoto, Shuji Shigemoto, Yoshitaka Suzuki, Mayumi Nakamura, Kazuo Okura, Keisuke Nishigawa, Nami Goto, Omar Marianito Maningo Rodis, Yoshizo Matsuka Source Type: research

Standards for Reporting EMG Data
(Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 8, 2015 Category: Neurology Source Type: research

Teaching Tool
(Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 8, 2015 Category: Neurology Source Type: research

Recurrence Quantification Analysis and Support Vector Machines for Golf Handicap and Low Back Pain EMG classification
The quantification of non-linear characteristics of electromyography (EMG) must contain information allowing to discriminate neuromuscular strategies during dynamic skills. There are a lack of studies about muscle coordination under motor constrains during dynamic contractions. In golf, both handicap (Hc) and low back pain (LBP) are the main factors associated with the occurrence of injuries. The aim of this study was to analyze the accuracy of support vector machines SVM on EMG-based classification to discriminate Hc (low and high handicap) and LBP (with and without LPB) in the main phases of golf swing. (Source: Journal ...
Source: Journal of Electromyography and Kinesiology - May 3, 2015 Category: Neurology Authors: Luís Silva, João Rocha Vaz, Maria António Castro, Pedro Serranho, Jan Cabri, Pedro Pezarat-Correia Source Type: research

Individuals with chronic low back pain demonstrate delayed onset of the back muscle activity during prone hip extension
Prone hip extension (PHE) is commonly used in the evaluation of the stability of the lumbopelvic region. There is little evidence of difference in muscle activity onset timing between healthy individuals and individuals with chronic low back pain (CLBP) during PHE. The purpose of this study was to determine if individuals with and without CLBP differ in the onset time of the trunk and hip extensor muscles activity during PHE. The participants were 20 patients with CLBP and 20 healthy individuals. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - May 3, 2015 Category: Neurology Authors: Tadanobu Suehiro, Masatoshi Mizutani, Hiroshi Ishida, Kenichi Kobara, Hiroshi Osaka, Susumu Watanabe Source Type: research

Activation time analysis and electromyographic fatigue in patients with temporomandibular disorders during clenching
Introduction: The use of surface electromyography (SEMG) is controversial in the diagnosis and subsequent treatment of temporomandibular disorders (TMD), although there is some evidence that the pattern of the masticatory muscles in TMD patients differs from controls. The aim of this study was to compare relative time of mandibular elevator muscle activation at different levels of activity and median frequency (MF) during sustained clenching. Methods: Twenty-two women, aged between 18 and 48 years, volunteered to participate in the study. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 23, 2015 Category: Neurology Authors: Natássia Condilo Pitta, Gabriel Silva Nitsch, Mariana Barcellos Machado, Anamaria Siriani de Oliveira Source Type: research