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Journal of Electromyography and Kinesiology

Christopher McDowell, Matthew Smyk, Paul S Sung
Compensatory trunk and hip motions following slip perturbations may compromise the control of lumbopelvic movement. However, it is unclear how postural integration of the trunk and hips can be transferred to treadmill-induced slip perturbations in subjects with chronic low back pain (LBP). The purpose of this study was to investigate trunk reaction times and three-dimensional trunk-hip angle changes following a slip perturbation (duration: 0.12 sec, velocity: 1.37 m/sec, displacement: 8.22 cm) with a handheld task between subjects with and without chronic LBP...
September 15, 2018: Journal of Electromyography and Kinesiology
Simone C Gafner, Veronika Hoevel, Ilona M Punt, Stefan Schmid, Stephane Armand, Lara Allet
Diminished hip abductor strength decreases postural control which is a parameter that is associated with an increased risk of ankle sprains. In our study we evaluated the influence of hip abductor fatigue on sagittal plane ankle kinematics and shank muscle activity during a single-leg forward jump. Sagittal ankle plane kinematics are important in ankle sprains but less studied than frontal plane kinematics. Therefore, we evaluated differences in sagittal ankle kinematics (12-camera motion capture system) and lower limb surface electromyographic muscle activity in 20 healthy, recreationally active adults (9 females, 11 males, mean age 30...
September 12, 2018: Journal of Electromyography and Kinesiology
Marija Trajkov, Ivan Cuk, Fadilj Eminovic, Dragana Kljajic, Milivoj Dopsaj
Physical activity, muscle strength and the ability to maintain postural stability (PS) are important for well-being in old age. Therefore, the first aim of this study was to assess the contractile abilities of the hand muscles (CAHM) in physically active (PA) and sedentary (SED) older women. The second aim was to examine the relationship between CAHM and PS indicators in older women. The sample of 75 women (aged 65-86 years), was divided into PA and SED group. Differences in CAHM, namely rate of force development and muscular endurance, were confirmed in favor of PA group, whereas, no differences were found between PA and SED group regarding maximum force...
September 12, 2018: Journal of Electromyography and Kinesiology
David C Kingston, Stacey M Acker
Activation waveforms of vastus intermedius, adductor magnus, and semimembranosus have not been reported for high knee flexion activities such as kneeling or squatting, likely due to the invasive procedures required for their measurement. Their relatively large physiological cross sectional areas would suggest their contributions to knee joint loading could be considerable. Therefore, the purpose of this study was to quantify the activities of these muscles using fine-wire EMG and to assess easy to measure surface sites (vastus lateralis, rectus femoris, vastus medialis, semitendinosus, and biceps femoris) for their potential as proxy measures using <10 %MVC RMS and >0...
September 12, 2018: Journal of Electromyography and Kinesiology
Alister du Rose, Alex Breen, Alan Breen
Muscle strengthening exercises are commonly used in primary care for the treatment of chronic, non-specific low back pain (CNSLBP) as it has been theorised that increased muscle activity contributes to the stabilisation of inter-vertebral motion segments during bending and other spinal movements, however this has never been demonstrated in vivo. This study used contemporaneous quantitative fluoroscopy (QF) and surface electromyography (sEMG) to investigate relationships between continuous inter-vertebral motion variables and muscle electrical activity in the lumbar multifidus (LMU), lumbar and thoracic erector spinae (LES and TES) during standardised lumbar flexion and return in 18 healthy male human subjects...
September 12, 2018: Journal of Electromyography and Kinesiology
Elisa S Arch, Sarah Colon, Karin Grävare Silbernagel, Jeremy R Crenshaw
Individuals with plantar flexor weakness often require rehabilitation and/or orthoses, which should be personalized based on level of weakness. While plantar flexor weakness can be measured via peak plantar flexion moment during gait (MGAIT ), motion analysis systems are often not clinically available. Clinical measures, such as the single-leg heel rise (SLHR) test and isometric muscle test, may provide surrogate measures of plantar flexor function during gait. However, it is currently unknown if a relationship(s) exists between such measures...
September 11, 2018: Journal of Electromyography and Kinesiology
L St George, S J Hobbs, J Richards, J Sinclair, D Holt, S H Roy
High-pass filtering (HPF) is a fundamental signal processing method for the attenuation of low-frequency noise contamination, namely baseline noise and movement artefact noise, in human surface electromyography (sEMG) research. Despite this, HPF is largely overlooked in equine sEMG research, with many studies not applying, or failing to describe, the application of HPF. An optimal HPF cut-off frequency maximally attenuates noise while minimally affecting sEMG signal power, but this has not been investigated for equine sEMG signals...
September 11, 2018: Journal of Electromyography and Kinesiology
Alan C Cudlip, Clark R Dickerson
The supraspinatus is one of the muscles of the rotator cuff, and growing research on fibre type composition and mechanical advantages in specific postures suggest this muscle may have distinct anterior and posterior regions. Activation differences between these regions may identify important functional differences. This research quantified muscular activation of these regions throughout a range of motion with differing hand loads. Forty participants completed paced humeral elevations in 7 planes of elevation (0/15/30/40/60/75/90°) using 3 hand loads (unloaded arm/20%/40% maximal elevation strength)...
August 29, 2018: Journal of Electromyography and Kinesiology
Daniele Coraci, Silvia Giovannini, Andrea Bernetti, Julianne Tannous Cordenonssi, Carmen Erra, Giulia Piccinini, Luca Padua
No abstract text is available yet for this article.
August 27, 2018: Journal of Electromyography and Kinesiology
Wei-Chi Tsai, Hen-Yu Lien, Wen-Yu Liu, Siang-Lan Guo, Yang-Hua Lin, Tsui-Fen Yang
Clinicians frequently incorporate unstable sitting devices into training plans for improving proximal postural muscle control; however, the effect of unstable sitting conditions on postural adjustments during dynamic activities has not been fully explored. The aim of this study was to characterize early postural adjustments (EPAs) and anticipatory postural adjustments (APAs) under stable and unstable sitting conditions. Using a cross-sectional laboratory study design, 13 healthy college student volunteers used their dominant hand to reach forward and push a target under stable and unstable sitting conditions; subjects sat on an air-filled rubber cushion for the unstable condition...
August 27, 2018: Journal of Electromyography and Kinesiology
Gabriel Moisan, Martin Descarreaux, Vincent Cantin
The aim of this study was to quantify the effects of foot orthoses (FOs) with and without a lateral bar on muscle activity of participants with cavus feet. Fifteen participants were recruited from the Université du Québec à Trois-Rivières students and podiatry clinic. The muscle activity of the tibialis anterior, fibularis longus, gastrocnemius lateralis and medialis, vastus medialis and lateralis, biceps femoris and gluteus medius were recorded during fast walking under two experimental conditions (FOs with and without a lateral bar) and a control condition (shoes)...
August 18, 2018: Journal of Electromyography and Kinesiology
Daniela Ciprandi, Matteo Zago, Filippo Bertozzi, Chiarella Sforza, Christel Galvani
Typically gait speed decreases and gait variability increases in elderly. The aim of this study was to define the influence of energy cost of walking on gait speed and of health-related physical fitness on gait variability. Thirty healthy young and older women were recruited in the study. Energy cost of walking (NetCW ) was analyzed with indirect calorimetry while a kinematic analysis was performed with an optoelectronic system to calculate gait variability (GV) during treadmill walking at different speeds...
July 26, 2018: Journal of Electromyography and Kinesiology
Sunghoon Minn, Julie N Côté
Women report more neck/shoulder musculoskeletal disorders in association to low-force, dexterous work. However, it is unclear if this may be due to gender differences in sensorimotor patterns while performing such tasks. Twenty-nine asymptomatic adult volunteers (15 men, 14 women) performed a neck/shoulder fatiguing task involving screwing and unscrewing bolts placed at shoulder height until scoring 8 on a Borg CR-10 scale. During the task, performance (bolts/min) was measured, and electromyography (EMG) was recorded at eight neck/shoulder muscle sites to compute Root Mean Square (RMS), Motor Variability and Normalized Mutual Information (NMI)...
October 2018: Journal of Electromyography and Kinesiology
Haifeng Wu, Qing Huang, Daqing Wang, Lifu Gao
The commonly used classifiers for pattern recognition of human motion, like backpropagation neural network (BPNN) and support vector machine (SVM), usually implement the classification by extracting some hand-crafted features from the human biological signals. These features generally require the domain knowledge for researchers to be designed and take a long time to be tested and selected for high classification performance. In contrast, convolutional neural network (CNN), which has been widely applied to computer vision, can learn to automatically extract features from the training data by means of convolution and subsampling, but CNN training usually requires large sample data and has the overfitting problem...
October 2018: Journal of Electromyography and Kinesiology
Elis E A Cabral, Guilherme A F Fregonezi, Luana Melo, Nada Basoudan, Sunita Mathur, W Darlene Reid
The aim of this systematic review was to examine procedures used and outcome measures reported from surface EMG (sEMG) of extradiaphragm inspiratory muscles in healthy people. Relevant articles were searched using the concepts "electromyography (EMG)", "respiratory muscles (sternocleidomastoid [SM], scalene, intercostal [IC] and parasternal)" and "healthy" in the electronic databases: MEDLINE, PubMed, EMBASE, Cochrane CENTRAL and Database of Systematic Reviews, CINAHL, SPORTDiscus, LILACS, and PEDro...
October 2018: Journal of Electromyography and Kinesiology
Alessandro Mengarelli, Andrea Gentili, Annachiara Strazza, Laura Burattini, Sandro Fioretti, Francesco Di Nardo
Muscular co-activation is a well-known mechanism for lower limb joint stabilization in both healthy and pathological individuals. This muscular feature appears particularly important for the knee joint, not only during challenging motor tasks such as cutting and landing but also during walking, due to knee cyclic loading. Gastrocnemius acts on the knee joint with a flexor activity and co-activations with quadriceps muscles lead to greater knee ligament strain with respect to an isolated burst of either muscle...
October 2018: Journal of Electromyography and Kinesiology
Paolo Cattarello, Silvia Vinelli, Samuel D'Emanuele, Marco Gazzoni, Roberto Merletti
This work investigates the effect of different seats on violin and viola players sitting postures using High-Density-surface-Electromyography techniques (HDsEMG), biomechanical and comfort indices. Five types of chairs were assessed on 18 violin and three viola players by comparing: (a) pelvic tilt and kyphosis and lordosis angles, (b) subjective comfort indices, and (c) EMG amplitude of erector spinae and trapezius. Sitting "as you like" on a standard orchestra chair is the condition with the highest subjective comfort (but not significantly different from other chairs)...
October 2018: Journal of Electromyography and Kinesiology
Patrick M Tomko, Ryan J Colquhoun, Mitchel A Magrini, Tyler W D Muddle, Nathaniel D M Jenkins
OBJECTIVE: To determine if maximal isometric contraction (MVIC) method (i.e., ramp (MVICRAMP ) versus traditional MVIC) influences (1) maximal voluntary isometric torque (MVIT) production of the knee extensors, (2) electromyographic signal amplitude (EMGAMP ), and (3) EMG mean power frequency (EMGMPF ) of the rectus femoris and vastus lateralis in moderately-to highly-activated subjects. We hypothesized that EMGAMP would be greater during the MVICRAMP than MVIC muscle contractions, but that there would be no difference in MVIT...
October 2018: Journal of Electromyography and Kinesiology
Mascha Pauelsen, Irene Vikman, Viktor Johansson Strandkvist, Agneta Larsson, Ulrik Röijezon
Physical performance including balance tasks is one of the main factors explaining the variance in falls self-efficacy in older adults. Balance performance is often measured by use of gross assessment scales, which assess the result of integration of all systems involved in postural control. We aimed to investigate which measurements of postural control correlate to falls self-efficacy scores as measured by the FES-I instrument, and which sensory and motor systems best explain them. A cross sectional study was designed, in which 45 older adults performed quiet stance and limits of stability trials during which their center of pressure (CoP) excursion was recorded...
October 2018: Journal of Electromyography and Kinesiology
J Lakshmi R Jayalath, Marcos de Noronha, Nivan Weerakkody, Rodrigo Bini
Fatigue is common during physical activity and can have an effect on ankle biomechanics during different actions, such as a jump. Yet current research on the topic is very heterogeneous and hinders clarity on what changes are actually due to fatigue. Therefore, the aim of this review was to summarise and analyse the current literature that investigates the effects of fatigue on ankle biomechanics during a jump. Searches were conducted in five databases and studies with activities eliciting fatigue and comparing outcomes under a fatigue and non-fatigue conditions were selected...
October 2018: Journal of Electromyography and Kinesiology
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