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.

Summation of slow motor unit forces at constant and variable interpulse intervals in rat soleus muscle
Effects of the summation of forces generated by functionally isolated slow-twitch motor units (MU) of the rat soleus muscle were examined in this study. Initially, the twitch, fused tetanic and unfused tetanic contractions evoked by trains of stimuli at variable interpulse intervals were recorded for each MU. Then, two, three or four MUs were co-activated, and the recorded forces were compared to the algebraic sum of the forces of individual MUs. The mean cumulative force of twitches and the mean cumulative force of fused tetani were not statistically different from the respective algebraic sums of forces, which revealed a...
Source: Journal of Electromyography and Kinesiology - May 6, 2016 Category: Neurology Authors: Hanna Drzyma ła-Celichowska, Piotr Kaczmarek, Piotr Krutki, Jan Celichowski Source Type: research

Reliability of ground reaction forces in the aquatic environment
The aim of this study was to verify the reliability of the kinetic parameters of gait using an underwater force platform. A total of 49 healthy participants with a median age of 21years were included. The kinetic gait data were collected using a 0.6 ×0.6×0.1m aquatic force plate (Bertec®), set in a pool (15×13×1.30m) with a water depth of 1.20m and water temperature of 32.5°C. Participants walked 10m before reaching the platform, which was fixed to the ground. Participants were instructed to step onto the platform with their preferred lim b and data from three valid attempts were used to calculate the average values....
Source: Journal of Electromyography and Kinesiology - May 6, 2016 Category: Neurology Authors: Maria Simone Tavares Barreto, La ís Faganello Dela Bela, Josilainne Marcelino Dias, Alexandre Roberto Marcondes Pelegrinelli, Renata Rosa de Campos, Rodrigo Gustavo da Silva Carvalho, Marcelo Taglietti, João Pedro Batista, Mariana Felipe Silva, Mabel Mi Source Type: research

Reliability of ground reaction forces in the aquatic environment
The aim of this study was to verify the reliability of the kinetic parameters of gait using an underwater force platform. A total of 49 healthy participants with a median age of 21 years were included. The kinetic gait data were collected using a 0.6x0.6x0.1m aquatic force plate (Bertec®), set in a pool (15x13x1.30 m) with a water depth of 1.20 m and water temperature of 32.5 °C. Participants walked 10 meters before reaching the platform, which was fixed to the ground. Participants were instructed to step onto the platform with their preferred limb and data from three valid attempts were used to calculate the average val...
Source: Journal of Electromyography and Kinesiology - May 6, 2016 Category: Neurology Authors: Maria Simone Tavares Barreto, Laís Faganello Dela Bela, Josilainne Marcelino Dias, Alexandre Roberto Marcondes Pelegrinelli, Renata Rosa de Campos, Rodrigo Gustavo da Silva Carvalho, Marcelo Taglietti, João Pedro Batista Júnior, Mariana Felipe Silva, M Source Type: research

Summation of slow motor unit forces at constant and variable interpulse intervals in rat soleus muscle
Effects of the summation of forces generated by functionally isolated slow-twitch motor units (MU) of the rat soleus muscle were examined in this study. Initially, the twitch, fused tetanic and unfused tetanic contractions evoked by trains of stimuli at variable interpulse intervals were recorded for each MU. Then, two, three or four MUs were co-activated, and the recorded forces were compared to the algebraic sum of the forces of individual MUs. The mean cumulative force of twitches and the mean cumulative force of fused tetani were not statistically different from the respective algebraic sums of forces, which revealed a...
Source: Journal of Electromyography and Kinesiology - May 6, 2016 Category: Neurology Authors: Hanna Drzymała-Celichowska, Piotr Kaczmarek, Piotr Krutki, Jan Celichowski Source Type: research

Use of muscle synergies and wavelet transforms to identify fatigue during squatting
The objective of this study was to supplement continuous wavelet transforms with muscle synergies in a fatigue analysis to better describe the combination of decreased firing frequency and altered activation profiles during dynamic muscle contractions. Nine healthy young individuals completed the dynamic tasks before and after they squatted with a standard Olympic bar until complete exhaustion. Electromyography (EMG) profiles were analyzed with a novel concatenated non-negative matrix factorization method that decomposed EMG signals into muscle synergies. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 27, 2016 Category: Neurology Authors: Kenneth B. Smale, Mohammad S. Shourijeh, Daniel L. Benoit Source Type: research

Lumbopelvic flexibility modulates neuromuscular responses during trunk flexion–extension
Various stimuli such as the flexibility of lumbopelvic structures influence the neuromuscular responses of the trunk musculature, leading to different load sharing strategies and reflex muscle responses from the afferents of lumbopelvic mechanoreceptors. This link between flexibility and neuromuscular response has been poorly studied.The aim of this study was to investigate the relationship between lumbopelvic flexibility and neuromuscular responses of the erector spinae, hamstring and abdominal muscles during trunk flexion–extension. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 25, 2016 Category: Neurology Authors: Daniel Sánchez-Zuriaga, Carla Artacho-Pérez, Gemma Biviá-Roig Source Type: research

The influence of myosin heavy chain isoform content on mechanical behavior of the vastus lateralis in vivo
This study examined correlations between type I percent myosin heavy chain isoform content (%MHC) and mechanomyographic amplitude (MMGRMS) during isometric muscle actions. Fifteen (age=21.63±2.39) participants performed 40% and 70% maximal voluntary contractions (MVC) of the leg extensors that included increasing, steady force, and decreasing segments. Muscle biopsies were collected and MMG was recorded from the vastus lateralis. Linear regressions were fit to the natural-log transformed MMGRMS-force relationships (increasing and decreasing segments) and MMGRMS was selected at the targeted force level during the steady fo...
Source: Journal of Electromyography and Kinesiology - April 25, 2016 Category: Neurology Authors: Michael A. Trevino, Trent J. Herda, Andrew C. Fry, Philip M. Gallagher, John P. Vardiman, Eric M. Mosier, Jonathan D. Miller Source Type: research

The effect of three-dimensional postural change on shear elastic modulus of the iliotibial band
To understand and treat iliotibial band (ITB) syndrome, caused by excessive compression between the ITB and lateral femoral condyle, it is important to identify factors contributing to an increase in ITB stiffness. The purpose of this study was to clarify the factors that contribute to an increase in ITB stiffness by examining the relationship between three-dimensional postural changes and ITB stiffness. Fourteen healthy individuals performed one-leg standing under 7 conditions (including normal one-leg standing as a control condition) in which the pelvic position was changed in three planes. (Source: Journal of Electromyo...
Source: Journal of Electromyography and Kinesiology - April 25, 2016 Category: Neurology Authors: Hiroshige Tateuchi, Sakiko Shiratori, Noriaki Ichihashi Source Type: research

Lumbopelvic flexibility modulates neuromuscular responses during trunk flexion-extension
Various stimuli such as the flexibility of lumbopelvic structures influence the neuromuscular responses of the trunk musculature, leading to different load sharing strategies and reflex muscle responses from the afferents of lumbopelvic mechanoreceptors. This link between flexibility and neuromuscular response has been poorly studied.The aim of this study was to investigate the relationship between lumbopelvic flexibility and neuromuscular responses of the erector spinae, hamstring and abdominal muscles during trunk flexion-extension. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 25, 2016 Category: Neurology Authors: Daniel Sánchez-Zuriaga, Carla Artacho-Pérez, Gemma Biviá-Roig Source Type: research

The mechanics of activated semitendinosus are not representative of the pathological knee joint condition of children with cerebral palsy
Characteristic cerebral palsy effects in the knee include a restricted joint range of motion and forcefully kept joint in a flexed position. To show whether the mechanics of activated spastic semitendinosus muscle are contributing to these effects, we tested the hypothesis that the muscle’s joint range of force exertion is narrow and force production capacity in flexed positions is high. The isometric semitendinosus forces of children with cerebral palsy (n=7, mean (SD)=7 years (8 months), GMFCS levels III-IV, 12 limbs tested) were measured intra-operatively as a function of knee angle, from flexion (120°) to full exten...
Source: Journal of Electromyography and Kinesiology - April 18, 2016 Category: Neurology Authors: Filiz Ateş, Yener Temelli, Can A. Yucesoy Source Type: research

Kinesiotaping enhances the rate of force development but not the neuromuscular efficiency of physically active young men
Investigations on the effects of KT on human performance have been increasing in the last few years. However, there is a paucity of studies investigating its effects on neuromuscular efficiency (NME) and rate of force development (RFD). (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 17, 2016 Category: Neurology Authors: Igor Magalhães, Martim Bottaro, Rinaldo André Mezzarane, Frederico Ribeiro Neto, Bruno A. Rodrigues, João B. Ferreira-Junior, Rodrigo Luiz Carregaro Source Type: research

An investigation of the simultaneously recorded occlusal contact and surface electromyographic activity of jaw-closing muscles for patients with temporomandibular disorders and a scissors-bite relationship
Surface electromyographic (SEMG) activity of the masseter and anterior temporalis (TA) muscles has been reported to be associated with occlusion and orofacial pain. However, our recent report did not reveal an association between the side of orofacial pain and the side showing higher or lower level of SEMG activity of masseter or TA. The present purpose was to re-test this association in patients who had unilateral scissors-bite relationship. Thirty-two unilateral scissors-bite femalepatients complaining of unilateral orofacial pain (n=15) or TMJ sounds (n=17) were enrolled to simultaneously record contacts, force distribu...
Source: Journal of Electromyography and Kinesiology - April 14, 2016 Category: Neurology Authors: Kun Qi, Shao-Xiong Guo, YiFei Xu, Qi Deng, Lu Liu, Baoyong Li, Mei-Qing Wang Source Type: research

Is rotating between static and dynamic work beneficial for our fatigue state?
Shoulder disorders comprise a large part of work-related musculoskeletal disorders. Risk factors, such as repetitiveness and monotony, may cause muscle fatigue and be attenuated by task rotation. We investigated rotation between a dynamic box-lifting task and a relatively static pick-and-place task and aimed to determine whether (1) a high rotation frequency leads to less fatigue development than a low rotation frequency, and (2) a self-selected rotation frequency leads to less fatigue development than imposed rotation frequencies. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 10, 2016 Category: Neurology Authors: Tessy Luger, Tim Bosch, Marco J.M. Hoozemans, DirkJan H.E.J. Veeger, Michiel P. de Looze Source Type: research

In a dynamic lifting task, the relationship between cross-sectional abdominal muscle thickness and the corresponding muscle activity is affected by the combined use of a weightlifting belt and the Valsalva maneuver
It has been shown that under isometric conditions, as the activity of the abdominal muscles increases, the thicknesses of the muscles also increase. The purpose of this experiment was to determine whether change in muscle thickness could be used as a measure of muscle activity during a deadlift as well as determining the effect of a weightlifting belt and/or the Valsalva maneuver on the muscle thicknesses. The Transversus Abdominis (TrA) and Internal Obliques (IO) muscles were analyzed at rest and during a deadlift. (Source: Journal of Electromyography and Kinesiology)
Source: Journal of Electromyography and Kinesiology - April 7, 2016 Category: Neurology Authors: Trevor W. Blanchard, Camille Smith, Sylvain G. Grenier Source Type: research