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.

The effect of asymmetrical body orientation during simulated forward falls on the distal upper extremity impact response of healthy people
This study quantified the effect of asymmetric loading and body postures on distal upper extremity response to simulated forward falls. Twenty participants were suspended from the Propelled Upper Limb fall ARest Impact System (PULARIS) in different torso and leg postures relative to the ground and to the sagittal plane (0 °, 30° and 45°). (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 26, 2017 Category: Neurology Authors: Timothy A. Burkhart, Evan Brydges, Jennifer Stefanczyk, David M. Andrews Source Type: research

Postural stability in young healthy subjects – Impact of reduced base of support, visual deprivation, dual tasking
To provide normative postural stability data in young subjects. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 18, 2017 Category: Neurology Authors: Inke Marie Albertsen, Mouna Gh édira, Jean-Michel Gracies, Émilie Hutin Source Type: research

The Relationship Between External Knee Moments and Muscle Co-Activation in Subjects with Medial Knee Osteoarthritis
Muscle co-activation should be used to measure the contribution of quadriceps, hamstring, and gastrocnemius on knee loading. This information would cooperate to develop a more comprehensive approach of knee loading in this population. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 17, 2017 Category: Neurology Authors: Luiz Fernando Approbato Selistre, Stela M árcia Mattiello, Theresa Helissa Nakagawa, Glaucia Helena Gonçalves, Marina Petrella, Richard Keith Jones Source Type: research

Dopaminergic modulation of multi-muscle synergies in postural tasks performed by patients with Parkinson ’s disease
Postural instability is one of most disabling motor symptoms in Parkinson ’s disease. Indices of multi-muscle synergies are new measurements of postural stability. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 12, 2017 Category: Neurology Authors: Ali Falaki, Xuemei Huang, Mechelle M. Lewis, Mark L. Latash Source Type: research

Is myoelectric activity distributed equally within the rectus femoris muscle during loaded, squat exercises?
Myoelectric activity distributed locally within RF was reported for isometric contractions, walking and fatigue. Here we investigate whether myoelectric activity distributes evenly within RF during squat. Surface electromyograms (EMGs) were sampled proximally and distally from RF with arrays of electrodes, while thirteen healthy volunteers performed 10 consecutive squats with 20% and 40% of their body weight. The root mean square (RMS) value, computed separately for thirds of the concentric and eccentric phases, was considered to assess the proximo-distal changes in EMG amplitude during squat. (Source: Journal of Electromy...
Source: Journal of Electromyography and Kinesiology - January 8, 2017 Category: Neurology Authors: Leonardo Mendes Leal de Souza, Desir ée Barros da Fonseca, Hélio da Veiga Cabral, Liliam Fernandes de Oliveira, Taian Martins Vieira Source Type: research

Validation of a Personalized Curved Muscle Model of the Lumbar Spine during Complex Dynamic Exertions
The objective of this study was to empirically validate a personalized biologically-assisted curved muscle model during complex dynamic exertions. Twelve subjects performed a variety of complex lifting tasks as a function of load weight, load origin, and load height. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 8, 2017 Category: Neurology Authors: Jaejin Hwang, Gregory G. Knapik, Jonathan S. Dufour, Thomas M. Best, Safdar N. Khan, Ehud Mendel, William S. Marras Source Type: research

Changes in lower limb muscle activity after walking on a split-belt treadmill in individuals post-stroke
This study analyzed lower limb muscle activity in individuals post-stroke related to SBT-induced changes in step length. Methods: Step length and surface EMG activity of six lower limb muscles were evaluated in individuals post-stroke (n=16) during (adaptation) and after (after-effects) walking at unequal belt speeds. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - January 2, 2017 Category: Neurology Authors: Martina Betschart, S éléna Lauzière, Carole Miéville, Bradford J. McFadyen, Sylvie Nadeau Source Type: research

An EMG-driven biomechanical model of the canine cervical spine
Due to the frequency of cervical spine injuries in canines, the purpose of this effort was to develop an EMG-driven dynamic model of the canine cervical spine to assess a biomechanical understanding that enables one to investigate the risk of neck disorders. A canine subject was recruited in this investigation in order to collect subject specific data. Reflective markers and a motion capture system were used for kinematic measurement; surface electrodes were used to record electromyography signals, and with the aid of force plate kinetics were recorded. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - December 25, 2016 Category: Neurology Authors: M. Alizadeh, G.G. Knapik, J.S. Dufour, C. Zindl, M.J. Allen, J. Bertran, N. Fitzpatrick, W.S. Marras Source Type: research

Assessment of the Non-Gaussianity and Non-Linearity Levels of Simulated sEMG Signals on Stationary Segments
The purpose of this paper was to evaluate the effects of the longitudinal single differential (LSD), the longitudinal double differential (LDD) and the normal double differential (NDD) spatial filters, the electrode shape, the inter-electrode distance (IED) on non-Gaussianity and non-linearity levels of simulated surface EMG (sEMG) signals when the maximum voluntary contraction (MVC) varied from 10% to 100% by a step of 10%. The effects of recruitment range thresholds (RR), the firing rate (FR) strategy and the peak firing rate (PFR) of motor units were also considered. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - December 23, 2016 Category: Neurology Authors: Noureddine Messaoudi, Ra ïs El'hadi Bekka, Philippe Ravier, Rachid Harba Source Type: research

Analysis of three-dimensional knee kinematics during stair descent two decades post-ACL rupture – Data revisited using statistical parametric mapping
Changes in movement patterns following knee injuries have generally used analyses of pre-defined discrete event-related variables, whereas Statistical Parametric Mapping (SPM) assesses continuous data over time. We applied SPM to test differences for knee trajectories during stair descent between participants with past anterior cruciate ligament (ACL) rupture who underwent reconstruction or only physical therapy compared to healthy controls. Three-dimensional knee joint kinematics during stair descent were registered for 31 subjects with ACL reconstruction (ACLR), 36 subjects with ACL rupture managed with physical therapy ...
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Gisela Sole, Todd Pataky, Eva Tengman, Charlotte H äger Source Type: research

Postural Response Characterization of Standing Humans to Multi-directional, Predictable and Unpredictable Perturbations to the Arm
When the arm of a standing human is perturbed in an unpredictable direction, postural muscles are activated at latencies as short as 50-110 ms. While the motion of the body clearly progresses in hand-to-leg sequence, there is no systematic muscle activation sequence from the arm to the leg muscles, suggesting that the activation of the muscles is not likely the result of local stretch reflexes. In fact, the lower limb muscles are activated before the upright posture is significantly disturbed. The short-latency activation amplitude and the activation probability are clearly tuned to the direction of the arm perturbation fo...
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Ali Forghani, Richard Preuss, Theodore Milner Source Type: research

Static Otolithic Drive Alters Presynaptic Inhibition in Soleus Motor Pool
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Apollonia Fox, David Koceja Source Type: research

A review of methods to assess coactivation in the Spine
Coactivation is an important component for understanding the physiological cost of muscular and spinal loads and their associations with spinal pathology and potentially myofascial pain. However, due to the complex and dynamic nature of most activities of daily living, it can be difficult to capture a quantifiable measure of coactivation. Many methods exist to assess coactivation, but most are limited to two-muscle systems, isometric/complex analyses, or dynamic/uniplanar analyses. Hence, a void exists in that coactivation has not been documented or assessed as a multiple-muscle system under realistic complex dynamic loadi...
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Peter Le, Thomas M. Best, Safdar N. Khan, Ehud Mendel, William S. Marras Tags: Review Source Type: research

Analysis of three-dimensional knee kinematics during stair descent two decades post-ACL rupture - data revisited using Statistical Parametric Mapping
Changes in movement patterns following knee injuries have generally used analyses of pre-defined discrete event-related variables, whereas statistical parametric mapping (SPM) assesses continuous data over time. We applied SPM to test differences for knee trajectories during stair descent between participants with past anterior cruciate ligament (ACL) rupture who underwent reconstruction or only physical therapy compared to healthy controls. Three-dimensional knee joint kinematics during stair descent were registered for 31 subjects with ACL reconstruction (ACLR), 36 subjects with ACL rupture managed with physical therapy ...
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Gisela Sole, Todd Pataky, Eva Tengman, Charlotte H äger Source Type: research

Effects of age and sex on fatigability and recovery from a sustained maximal isometric voluntary contraction
The aim was to assess the effects of sex and age on fatigability and recovery from sustained maximal voluntary contraction (MVC) of the knee extensor muscles. The central (central activation ratio (CAR) and electrical activity amplitude) and peripheral (electrically evoked torque and muscle contractile properties) factors contributing to fatigue and recovery of 24 young adults (12 males) aged 23.2 ± 3.6 years and 20 older adults (12 males) aged 70.6 ± 4.4 years were compared. The increase in central and peripheral fatigue was greater (p ⩽ 0.01) in the young adults vs the older adults. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - December 20, 2016 Category: Neurology Authors: Rima Solianik, Lina Kreiv ėnaitė, Vytautas Streckis, Dalia Mickevičienė, Albertas Skurvydas Source Type: research