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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...
July 16, 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...
July 10, 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...
July 9, 2018: Journal of Electromyography and Kinesiology
Yuichi Nishikawa, Kohei Watanabe, Tetsuya Takahashi, Hiroaki Kimura, Hirofumi Maruyama
The effect of levodopa on muscle activity patterns in Parkinson's disease (PD) patients is currently unclear. The aim of the present study was to compare the spatial distribution pattern of electromyographic activity during sustained isometric contraction in PD patients during on- and off-medication periods using multi-channel surface electromyography (SEMG). Ten female PD patients were recruited for the present study. All patients performed a sustained isometric knee extension at 10% maximum voluntary contraction task for 60 s...
June 25, 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)...
June 21, 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...
June 21, 2018: Journal of Electromyography and Kinesiology
Joshua C Carr, Matt S Stock, Jennah M Hernandez, Jesus R Ortegon, Jacob A Mota
We evaluated the compensatory adaptations in muscle regionalization and synergist activity after fatiguing a biarticular muscle at one joint with different muscle lengths. Eleven men (mean ± SD age = 23 ± 3 years) performed 50 maximal concentric isokinetic contractions of the dominant hip flexors on two occasions. For one trial, the knee joint was fully extended. For the other, the knee joint was fixed at 70°. Maximal voluntary contractions of the knee extensors were performed immediately before and after the hip flexion fatigue protocol while bipolar surface electromyographic signals were detected from the vastus lateralis and at five points along the length of the rectus femoris...
June 19, 2018: Journal of Electromyography and Kinesiology
Heidi Haavik, Imran Khan Niazi, Mads Jochumsen, Paulius Uginčius, Oğuz Sebik, Gizem Yılmaz, Muhammad Samran Navid, Mustafa Görkem Özyurt, Kemal S Türker
The objective of this study was to construct peristimulus time histogram (PSTH) and peristimulus frequencygram (PSF) using single motor unit recordings to further characterize the previously documented immediate sensorimotor effects of spinal manipulation. Single pulse transcranial magnetic stimulation (TMS) via a double cone coil over the tibialis anterior (TA) motor area during weak isometric dorsiflexion of the foot was used on two different days in random order; pre/post spinal manipulation (in eighteen subjects) and pre/post a control (in twelve subjects) condition...
June 19, 2018: Journal of Electromyography and Kinesiology
Emily E Gerstle, Kevin G Keenan, Kristian O'Connor, Stephen C Cobb
During step descent, lower extremity musculature is critical for positioning the foot and ankle for initial contact and stabilizing the structures following contact. Although continuous stair descent has been extensively examined, curb/single transition steps where many injuries occur requires further study. The purpose of this study was to identify the influence of landing strategy and step height on lower extremity muscle activity of uninjured individuals during transition step descent. Twenty-two participants walked along a level walkway, stepped down a single step (heights: 5-cm, 15-cm, 25-cm) landed with the heel or forefoot, and continued walking...
June 18, 2018: Journal of Electromyography and Kinesiology
Joni A Mettler, Dillon M Magee, Barbara M Doucet
The neuromuscular electrical stimulation (NMES) parameters that optimally modulate torque output during prolonged stimulation protocols are not well-established. The purpose of this study was to compare torque output between low-frequency and high-frequency NMES protocols while increasing stimulation intensity. Eleven healthy young individuals received a repetitive, intermittent low-frequency (20 Hz) and high-frequency (60 Hz) NMES over the quadriceps muscles. Stimulation intensity was increased throughout the protocol to achieve a submaximal target torque output...
June 18, 2018: Journal of Electromyography and Kinesiology
Matteo Zago, Chiarella Sforza, Ilaria Pacifici, Veronica Cimolin, Filippo Camerota, Claudia Celletti, Claudia Condoluci, Maria Francesca De Pandis, Manuela Galli
We investigated whether a wearable system based on a commercial Inertial Measurement Unit (IMU) can reliably provide the main spatiotemporal gait parameters in subjects with Parkinson's disease (PD), compared to a gold-standard optoelectronic motion capture system. The gait of 22 subjects with PD (Age: 69.4 (6.1) years; UPDRS-III: 28.0 (9.2)) was recorded simultaneously with an optoelectronic system and a commercial IMU-based wearable system. Eight spatiotemporal parameters describing the step cycle (cadence, velocity, stride length, stride duration, step length, stance, swing and double support duration) were compared between the two systems...
June 18, 2018: Journal of Electromyography and Kinesiology
Simone Ranaldi, Cristiano De Marchis, Silvia Conforto
Surface ElectroMyography (sEMG) is widely used as a non-invasive tool for the assessment of motor control strategies. However, the standardization of the methods used for the estimation of sEMG amplitude is a problem yet to be solved; in most cases, sEMG amplitude is estimated through the extraction of the envelope of the signal via different low-pass filtering procedures with fixed cut-off frequencies chosen by the experimenter. In this work, we have shown how it is not possible to find the optimal choice of the cut-off frequency without any a priori knowledge on the signal; considering this, we have proposed an updated version of an iterative adaptive algorithm already present in literature, aiming to completely automatize the sEMG amplitude estimation...
June 14, 2018: Journal of Electromyography and Kinesiology
A Kerasnoudis, P Ntasiou, G Barmpalios
INTRODUCTION: We report on the prognostic role of cross sectional area (CSA) enlargement and axonal damage in traumatic sural neuropathy (TSN). METHODS: Reference values were defined in 23 healthy subjects. 13patients with TSN underwent evaluation (Thessaloniki Hypesthesia Score (THS), ultrasound, electrophysiology). All patients were followed up with THS 6 months after initial evaluation. RESULTS: During initial evaluation, the 13 patients showed a mean THS of 2...
June 13, 2018: Journal of Electromyography and Kinesiology
Sharon M H Tsang, Amanda H M Lam, Melody H L Ng, Kiki W K Ng, Cherry O H Tsui, Benjamin Yiu
Abdominal exercise has been advocated to improve the protection of the spine and neuromuscular efficiency of the limb movements. The purpose of this study was to examine the effect of enhanced contraction of internal oblique and transversus abdominis (IO/TrA) on the activity level of the hip and posterior thigh muscles during therapeutic hip exercises. Twenty healthy females were required to perform eight hip exercises under two conditions, natural versus enhanced IO/TrA contraction conditions. Muscle activity of gluteus maximus, gluteus medius, tensor fasciae latae and biceps femoris of the exercising leg was measured by surface electromyography during hip exercises, and expressed in percentage normalized to the maximal voluntary isometric contraction (%MVIC)...
June 12, 2018: Journal of Electromyography and Kinesiology
Nosratollah Hedayatpour, Zahra Izanloo, Deborah Falla
High intensity eccentric exercise induces muscle fiber damage and associated delayed-onset muscle soreness (DOMS) resulting in an impaired ability of the muscle to generate voluntary force. This study investigates the extent to which DOMS, induced by high intensity eccentric exercise, can affect the activation and performance of the non-exercised homologous muscle of the contralateral limb. Healthy volunteers performed maximal voluntary contractions of knee extension and sustained isometric knee extension at 50% of maximal force until task failure on both the ipsilateral exercised limb and the contralateral limb...
June 6, 2018: Journal of Electromyography and Kinesiology
Sophie Heywood, Yong Hao Pua, Jodie McClelland, Paula Geigle, Ann Rahmann, Kelly Bower, Ross Clark
Widespread use of electromyography (EMG) as an assessment and biofeedback method may be limited by costly commercial systems. Low-cost devices are available; however their validity is unknown. This study determined the concurrent validity of a low-cost EMG on a microchip compared with a commercially available system during isometric and dynamic muscle contractions. Inter-tester, intra-session reliability of manual data extraction during data processing compared to a simple, automatic thresholding method using the Teager-Kaiser energy operator (TKEO) was also evaluated...
June 2, 2018: Journal of Electromyography and Kinesiology
Talia Alenabi, Rachel Whittaker, Soo Y Kim, Clark R Dickerson
This study aimed to identify optimal sets of maximal voluntary isometric contractions (MVICs) for normalizing EMG data from anterior and posterior regions of the supraspinatus, and superior, middle and inferior regions of the infraspinatus. 31 right-handed young healthy individuals (15 males, 16 females) participated. EMG activity was obtained from two regions of supraspinatus and three regions of infraspinatus muscles via fine wire electrodes. Participants performed 15 MVIC tests against manual resistance...
April 25, 2018: Journal of Electromyography and Kinesiology
Agostina Casamento-Moran, Rebecca Fleeman, Yen-Ting Chen, MinHyuk Kwon, Emily J Fox, Basma Yacoubi, Evangelos A Christou
Our ability to control movements is influenced by the developmental status of the neuromuscular system. Consequently, movement control improves from childhood to early adulthood but gradually declines thereafter. However, no study has compared movement accuracy between children and older adults. The purpose of this study was to compare endpoint accuracy during a fast goal-directed movement task in children and older adults. Ten pre-adolescent children (9.7 ± 0.67 yrs) and 19 older adults (71.95 ± 6...
April 24, 2018: Journal of Electromyography and Kinesiology
Charalambos C Charalambous, Jesse C Dean, DeAnna L Adkins, Colleen A Hanlon, Mark G Bowden
The investigation of the corticomotor connectivity (CMC) to leg muscles is an emerging research area, and establishing reliability of measures is critical. This study examined the measurement reliability and the differences between bilateral soleus (SOL) and tibialis anterior (TA) CMC in 21 neurologically intact adults. Using single pulse transcranial magnetic stimulation (TMS), each muscle's CMC was assessed twice (7 ± 2 days apart) during rest and active conditions. CMC was quantified using a standardized battery of eight measures (4/condition): motor threshold during resting (RMT), motor evoked potential amplitude and latency (raw and normalized to height) in both conditions, contralateral silent period (CSP) during active...
April 24, 2018: Journal of Electromyography and Kinesiology
Roghayeh Mousavi-Khatir, Saeed Talebian, Nima Toosizadeh, Gholam Reaza Olyaei, Nader Maroufi
The highly complex proprioceptive system provides neuromuscular control of the mobile cervical spine. Static neck flexion can induce the elongation of posterior tissues and altered afferent input from the mechanoreceptors. The purpose of this study was to examine the effect of prolonged static neck flexion on neck proprioception and anticipatory postural adjustments. Thirty-eight healthy participants (20 females and 18 males) between the ages of 20-35 years with no history of neck, low back, and shoulder pain enrolled in this study...
August 2018: Journal of Electromyography and Kinesiology
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