Journal of Electromyography and Kinesiology This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Absolute and relative intrasession reliability of surface EMG variables for voluntary precise forearm movements
The reliability of surface electromyography (EMG) derived parameters is of high importance, but there is distinct lack of studies concerning the reliability during dynamic contractions. Especially Amplitude, Fourier and Wavelet parameter in conjunction have not been tested so far. The interpretation of the EMG variables might be difficult because the movement itself introduces additional factors that affect its characteristics. The aim of this study was to determine the relative and absolute intrasession reliability of electromyographic (EMG) variables of selected arm muscles during concurrent precise elbow extension/flexi...
Source: Journal of Electromyography and Kinesiology - September 8, 2015 Category: Neurology Authors: Carius Daniel, Kugler Patrick, Kuhwald Hans-Marten, Wollny Rainer Source Type: research

Descriptive Analysis of Kinematics and Kinetics of Catchers Throwing to Second Base from their Knees
In order to decrease the amount of time that it takes the catcher to throw the ball, a catcher may chose to throw from the knees. Upper extremity kinematics may play a significant role in the kinetics about the elbow observed in catchers throwing from the knees. If relationships between kinematics and kinetics exist then the development of training and coaching instruction may help in reduced upper extremity injury risk. Twenty-two baseball and softball catchers (14.36 ± 3.86 years; 165.11 ± 17.54 cm; 65.67 ± 20.60 kg) volunteered. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 29, 2015 Category: Neurology Authors: Hillary A. Plummer, Gretchen D. Oliver Source Type: research

Mechanical and electromyographic responses during the 3-min all-out test in competitive cyclists
While the 3-min all-out test is an ideal exercise paradigm to study muscle fatigue during dynamic whole-body exercise, so far it has been used mainly to provide insight into the bioenergetic determinants of performance. To shed some light into the development of peripheral muscle fatigue during the 3-min all-out test, we investigated the time course of muscle-fibre conduction velocity (MFCV). Twelve well-trained cyclists (23±3yrs) performed an incremental test, a 3-min all-out familiarization trial and a 3-min all-out test. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 29, 2015 Category: Neurology Authors: Andrea Nicolò, Ilenia Bazzucchi, Francesco Felici, Federica Patrizio, Massimo Sacchetti Source Type: research

Standards for Reporting EMG Data
(Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 28, 2015 Category: Neurology Source Type: research

Changes in Lower Extremity Peak Angles, Moments and Muscle Activations during Stair Climbing at Different Speeds
Stair climbing is a common daily activity, yet there is no basic knowledge on how lower extremity joint angles, moments or muscle activations are affected by stair climbing speed. This information will determine whether speed matching is necessary for stair climbing studies. Moreover, changes in lower extremity biomechanics during stair climbing at different speeds will aid in the clinical interpretation of a patient’s maximal stair climbing speed.Thirty healthy participants provided consent. Kinematics, kinetics, and muscle activations were collected on a three step staircase. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 27, 2015 Category: Neurology Authors: Jacqueline Lewis, Greg Freisinger, Xueliang Pan, Robert Siston, Laura Schmitt, Ajit Chaudhari Source Type: research

Investigation of 3D glenohumeral displacements from 3D reconstruction using biplane X-ray images: accuracy and reproducibility of the technique and preliminary analysis in rotator cuff tear patients
Rotator cuff (RC) tears may be associated with increased glenohumeral instability; however, this instability is difficult to quantify using currently available diagnostic tools. Recently, the three-dimensional (3D) reconstruction and registration method of the scapula and humeral head, based on sequences of low-dose biplane X-ray images, has been proposed for glenohumeral displacement assessment. This research aimed to evaluate the accuracy and reproducibility of this technique and to investigate its potential with a preliminary application comparing RC tear patients and asymptomatic volunteers. (Source: Journal of Electro...
Source: Journal of Electromyography and Kinesiology - August 26, 2015 Category: Neurology Authors: Cheng Zhang, Wafa Skalli, Pierre-Yves Lagacé, Fabien Billuart, Xavier Ohl, Thierry Cresson, Nathalie J. Bureau, Dominique M. Rouleau, André Roy, Patrice Tétreault, Christophe Sauret, Jacques A. de Guise, Nicola Hagemeister Source Type: research

Measurement of clavicular length and shortening after a midshaft clavicular fracture: Spatial digitization versus planar roentgen photogrammetry
This study aimed to assess the reliability of roentgen photogrammetry (2D) of clavicular length and shortening, and to compare these with 3D-spatial digitization measurements, obtained with an electromagnetic recording system (Flock of Birds). (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 24, 2015 Category: Neurology Authors: Sylvia A. Stegeman, Pieter Bas de Witte, Sjoerd Boonstra, Jurriaan H. de Groot, Jochem Nagels, Pieta Krijnen, Inger B. Schipper Source Type: research

Fatigue-induced glenohumeral and scapulothoracic kinematic variability: Implications for subacromial space reduction
Superior humeral head translation and scapula reorientation can reduce the subacromial space. While these kinematic abnormalities exist in injured populations, the effect of muscle fatigue is unclear. Additionally, these mechanisms were typically studied independently, thereby neglecting potential covariance. This research evaluated the influence of upper extremity muscle fatigue on glenohumeral and scapulothoracic kinematics and defined their relationship. Radiography and motion tracking systems captured these kinematic relationships, during scapula plane elevation, both before and after fatigue. (Source: Journal of Elect...
Source: Journal of Electromyography and Kinesiology - August 19, 2015 Category: Neurology Authors: Jaclyn N. Chopp-Hurley, John M. O’Neill, Alison C. McDonald, Jacquelyn M. Maciukiewicz, Clark R. Dickerson Source Type: research

The effects of ankle supports on gait in adults: A randomized cross-over study
We aimed to compare the effects of different ankle supports used after ankle injury/surgery on temporo-spatial gait characteristics. We conducted a randomized cross-over study including adult participants with no previous lower limb or neurological pathology, who underwent gait analysis on an electronic walkway in three different ankle supports, Tubigrip®, a stirrup brace and a walker boot. The 18 participants were an average age of 42 (SD 13, range 24 to 62) years and 14 (88%) were female. Compared to Tubigrip®, gait in the walker boot was slower (-0.19m/s, 95%CI -0.23 to -0.16, P (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 19, 2015 Category: Neurology Authors: David J. Keene, Keith Willett, Sarah E. Lamb Source Type: research

Anatomical glenohumeral internal rotation deficit and symmetric rotational strength in male and female young beach volleyball players
Beach volleyball is a sport with a high demand of shoulder structures that may lead to adaptations in range of motion (ROM) and strength like in other overhead sports. Despite of these possible alterations, no study evaluated the shoulder adaptations in young beach volleyball athletes. The aim of this study was to compare the bilateral ROM and rotation strength in the shoulders of young beach volleyball players. Goniometric passive shoulder ROM of motion and isometric rotational strength were evaluated in 19 male and 14 female asymptomatic athletes. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - August 17, 2015 Category: Neurology Authors: Michele Forgiarini Saccol, Gabriel Peixoto Leão Almeida, Vivian Lima de Souza Source Type: research

Comparison of humeral rotation co-activation of breast cancer population and healthy shoulders
Upper limb morbidities are common amongst the breast cancer population (BCP) and have a direct impact on independence. Comparing muscle co-activation strategies between BCP and healthy populations may assist in identifying muscle dysfunction and promote clinical interpretation of dysfunction, which could direct preventative and therapeutic interventions. The purposes of this study were to define humeral rotation muscle co-activation of a BCP and to compare it with a previously defined co-activation relationship of a healthy population. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - July 31, 2015 Category: Neurology Authors: Rebecca L. Brookham, Clark R. Dickerson Source Type: research

The concurrent validity of three computerized methods of muscle activity onset detection
Although the visual (VIS) method for muscle activation onset detection has been the gold standard, this method has been criticized because of its moderate reproducibility and for being laborious. The simple threshold (STH), approximated generalized likelihood-step (AGL-step), and Kmeans (KM) algorithms are more repeatable and less laborious but require validation for gait speeds encountered in clinical research. We, therefore, assessed the intra-rater reliability of the VIS method and the concurrent validity of the algorithms against the VIS for 3 gait speeds. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - July 28, 2015 Category: Neurology Authors: Sylvester Carter, Gregory Gutierrez Source Type: research

Noninvasive assessment of the activity of the shoulder girdle muscles using ultrasound real-time tissue elastography
The purpose of this study was to clarify whether the activity of the shoulder girdle muscles could be estimated by measuring the elasticity of these muscles under several levels of muscle contraction through ultrasound real-time tissue elastography (RTE). Ten healthy men performed submaximal voluntary contractions (MVC) in each manual muscle testing position for the middle deltoid, upper trapezius, supraspinatus, levator scapulae, and rhomboid major. The elasticity of these muscles was measured using ultrasound RTE during the task. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - July 28, 2015 Category: Neurology Authors: Hiroaki Ishikawa, Takayuki Muraki, Yusuke Sekiguchi, Takahiro Ishijima, Shuhei Morise, Nobuyuki Yamamoto, Eiji Itoi, Shin-Ichi Izumi Source Type: research

Glenohumeral joint kinematics measured by intracortical pins, reflective markers, and computed tomography: a novel technique to assess acromiohumeral distance
Biplane fluoroscopy provides accurate 3D measurement of the acromiohumeral distance (AHD) during dynamic tasks. However, less than 10trials can be achieved each year for each participant due to radiation exposure. Our objective was to propose a technique without this limitation to assess AHD and identify the distance between each humeral head and acromion part. The AHD was computed from glenohumeral kinematics obtained from markers fitted to pins drilled into the scapula and the humerus combined with 3D bone geometry obtained from CT-scan. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - July 28, 2015 Category: Neurology Authors: Fabien Dal Maso, Yoann Blache, Maxime Raison, Arne Lundberg, Mickaël Begon Source Type: research

Evaluation of regression-based 3-D shoulder rhythms
In this study, six existing regression-based shoulder rhythms were evaluated by an independent dataset in terms of their predictability. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - July 23, 2015 Category: Neurology Authors: Xu Xu, Clark R. Dickerson, Jia-hua Lin, Raymond W. McGorry Source Type: research