Journals Journal of Electromyography an...

Journal of Electromyography and Kinesiology
Erika Zambarano, Neal Glaviano, Lucinda Bouillon, Grant Norte, Amanda Murray
This study aimed to evaluate the effect of exhaustive exercise on lumbopelvic-hip complex (LPHC) muscle activity, stability, and single-leg squat kinematics. Twenty-two healthy participants (12 females, 23.5 ± 3.1 years) were recruited. LPHC stability was measured by number of errors committed during a seated trunk control test (STCT). Surface electromyography recorded muscle activity of rectus abdominis (RA), external oblique, internal oblique (IO), erector spinae, and gluteus medius during the STCT and single-leg squat, and was normalized to peak activity during the task...
December 2, 2023: Journal of Electromyography and Kinesiology
Giacomo Valli, Paul Ritsche, Andrea Casolo, Francesco Negro, Giuseppe De Vito
High-Density surface Electromyography (HD-sEMG) is the most established technique for the non-invasive analysis of single motor unit (MU) activity in humans. It provides the possibility to study the central properties (e.g., discharge rate) of large populations of MUs by analysis of their firing pattern. Additionally, by spike-triggered averaging, peripheral properties such as MUs conduction velocity can be estimated over adjacent regions of the muscles and single MUs can be tracked across different recording sessions...
November 30, 2023: Journal of Electromyography and Kinesiology
Yu Song, Ling Li, Jacob Layer, Gerwyn Hughes, Derek Smith, Margaret Wilson, Qin Zhu, Boyi Dai
Mid-flight external upper-trunk perturbation is associated with increased anterior cruciate ligament (ACL) injury risk during landing. This study aimed to assess the effect of natural, soft, and falling landing techniques on knee mechanics and vertical ground reaction forces (VGRF) during single-leg landings with/without mid-flight medial-lateral external upper-trunk pushing perturbation. Twenty-eight participants performed single-leg landings using the three landing techniques with/without mid-flight pushing perturbation...
November 30, 2023: Journal of Electromyography and Kinesiology
M Cogliati, A Cudicio, C Orizio
PURPOSE: This work studied muscle neuro-mechanics during symmetrical up-going ramp (UGR) and down-going ramp (DGR). AIM: to evaluate during the modulation of muscular action the outcome of force feedback (FF) or neural feedback (NF) on the behavior of the trailing signals - i.e. the EMG envelope (eEMG) for FF or force signal for NF. METHOD: Subjects: 20. Investigated muscles: dorsal interosseous (FDI) and tibialis anterior (TA). Detected signals: force and EMG...
November 30, 2023: Journal of Electromyography and Kinesiology
Yujin Kwon, Lillian K Chilton, Hoon Kim, Jason R Franz
Understanding the consequences and ecological relevance of muscle fatigue is important to guide the development of strategies to preserve independence. However, few studies have examined walking-related fatigue and the effects on walking instability. Our purpose was to investigate the effects of prolonged walking on leg muscle activity and vulnerability to balance perturbations. Eighteen healthy young adults completed a 30-min walking trial at their preferred walking speed while leg muscle activities were recorded...
November 4, 2023: Journal of Electromyography and Kinesiology
A Gkesou, A Papavasileiou, S Karagiaridis, T Kannas, I G Amiridis, V Hatzitaki, D A Patikas
Our aim was to compare three electrical stimulation protocols (P20, P30 and P40), with the same number of stimuli, but different stimulation frequencies (20, 30 and 40 Hz, respectively) and duty cycles [1.2:1.2 s (continuous), 0.8:1.2 s (intermittent) and 0.6:1.2 s (intermittent), respectively). Twitch force and the peak-to-peak M-wave amplitude of the thenar muscles were measured before, during and after each protocol at 1-40 Hz in random order. Twelve healthy adults (23-41 years old) were examined for each protocol in random order and in separate sessions...
November 4, 2023: Journal of Electromyography and Kinesiology
Emile Marineau-Bélanger, Martin Vaurs, Justin Roy, Julie O'Shaughnessy, Martin Descarreaux, Jacques Abboud
This study aims to identify how spatial distribution of lumbar muscle activity is modulated by different fatigue tasks. Twenty healthy adults performed two different isometric trunk extension endurance tasks (the modified Sorensen test and the inverted modified Sorensen test) until exhaustion. During these tasks, bilateral superficial lumbar muscle activity was recorded using high-density electromyography. The spatial distribution of activation within these muscles was obtained using the centroid coordinates in the medio-lateral and cranio-caudal directions...
November 4, 2023: Journal of Electromyography and Kinesiology
Tiwana Varrecchia, Alberto Ranavolo, Giorgia Chini, Alessandro Marco De Nunzio, Francesco Draicchio, Eduardo Martinez-Valdes, Deborah Falla, Silvia Conforto
Low back pain (LBP) is a leading cause of disability in the workplace, often caused by manually lifting of heavy loads. Instrumental-based assessment tools are used to quantitatively assess the biomechanical risk of lifting activities. This study aims to verify that, during the execution of fatiguing frequency-dependent lifting, high-density surface electromyography (HDsEMG) allows the discrimination of healthy controls (HC) versus people with LBP and biomechanical risk levels. Fifteen HC and eight people with LBP performed three lifting tasks with a progressively increasing lifting index, each lasting 15 min...
November 4, 2023: Journal of Electromyography and Kinesiology
Pratap Kumar Koppolu, Krishnan Chemmangat
Surface Electromyography (sEMG) signals are muscle activation signals, which has applications in muscle diagnosis, rehabilitation, prosthetics, and speech etc. However, they are known to be affected by noises such as Power Line Interference (PLI), motion artifacts etc. Currently, Empirical Mode Decomposition (EMD) and its modifications such as Ensemble EMD (EEMD), and Complementary EEMD (CEEMD) are used to decompose EMG into a series of Intrinsic Mode Functions (IMFs). The denoised EMG can be obtained from the selected IMFs...
October 20, 2023: Journal of Electromyography and Kinesiology
Amal M Alsubaie, Andy Sanderson, Hélio V Cabral, Eduardo Martinez-Valdes, Deborah Falla
Changes in spinal kinematic variability have been observed in people with chronic non-specific LBP (CNSLBP) during the performance of various repetitive functional tasks. However, the direction of these changes (i.e., less or more kinematic variability) is not consistent. This study aimed to assess differences in kinematic variability of the 3D angular displacement of thoracic and lumbar spinal segments in people with CNSLBP compared to asymptomatic individuals during a repetitive lifting task. Eleven people with CNSLBP and 11 asymptomatic volunteers performed 10 cycles of multi-planar lifting movements while spinal kinematics were recorded...
October 14, 2023: Journal of Electromyography and Kinesiology
Jun Umehara, Yasuyuki Ueda, Masahide Yagi, Shusuke Nojiri, Takashi Tachibana, Katsuya Nobuhara, Noriaki Ichihashi
PURPOSE: This study aimed i) to investigate the mechanical, morphological, and compositional characteristics of the supraspinatus muscle after rotator cuff repair by using ultrasound shear wave elastography (SWE) and B-mode imaging, and ii) to determine whether the morphological or compositional characteristics are associated with the mechanical characteristic of the supraspinatus during contraction. METHODS: Using SWE and B-mode imaging, active and passive shear moduli, muscle thickness, and echo intensity of the supraspinatus were measured from the repaired and contralateral control shoulders of 22 patients with rotator cuff repair...
October 14, 2023: Journal of Electromyography and Kinesiology
Daniel de Souza Teixeira, Marcelo A S Carneiro, Augusto Corrêa de Queiroz Freitas, Anderson Diogo de Souza Lino, Danyelle Pelet, Cláudio O Assumpção, Markus Vinicius Campos Souza, Fábio Lera Orsatti
This study aimed to investigate whether 4 weeks of unilateral resistance training (RT) could attenuate the decline in muscle function in the contralateral limb of older women recreationally engaged in RT compared to control group (CTL). Twenty-four participants completed a 10-week RT before the cross-education (CR-Edu) phase and subsequent detraining. Afterward, participants were randomized into two groups: CTL (n = 8 women, n = 16 legs) who underwent 4 weeks of detraining without any training, and CR-Edu (n = 16 women, n = 16 legs) who performed 4 weeks of unilateral RT...
October 14, 2023: Journal of Electromyography and Kinesiology
Niels P Brouwer, Ali Tabasi, Idsart Kingma, Dick F Stegeman, Wietse van Dijk, Alejandro Moya-Esteban, Massimo Sartori, Jaap H van Dieën
Trunk extensor muscle fatigue typically manifests as a decline in spectral content of surface electromyography. However, previous research on the relationship of this decline with trunk extensor muscle endurance have shown inconsistent results. The decline of spectral content mainly reflects the decrease in average motor unit action potential conduction velocity (CV). We evaluated whether the rate of change in CV, as well as two approaches employing the change in spectral content, are related to trunk extensor muscle endurance...
October 12, 2023: Journal of Electromyography and Kinesiology
Angelica E Lang
Tracking scapular motion can be challenging. More research is needed to determine the best practices for scapular measurement in multi-planar tasks. The purpose of this study was to compare the repeatability of scapular kinematics during a functional task protocol calculated from different calibration procedures. It was hypothesized that select poses would improve repeatability in specific tasks. The torso, humerus, and scapula were tracked with optical motion capture in two sessions for ten pain-free participants...
October 1, 2023: Journal of Electromyography and Kinesiology
Ivana Petrovic, Ioannis G Amiridis, Theodoros Kannas, Zoi Tsampalaki, Ales Holobar, Chrysostomos Sahinis, Eleftherios Kellis, Daniel Stankovic, Roger M Enoka
The aim of the study was to assess the potential influence of footedness and dominance on maximal force, force fluctuations and neural drive during dorsiflexion. Fifteen left-footed (LF) and fifteen right-footed (RF) young adults performed 2 maximal voluntary contractions (MVC) and 3 steady submaximal isometric contractions at five target forces (5, 10, 20, 40 and 60% MVC) with the dorsiflexors of both legs. High-density electromyography (EMG) was used to record the discharge characteristics of motor units (MUs) of Tibialis Anterior...
September 29, 2023: Journal of Electromyography and Kinesiology
Mohammed S Alenazy, Rehab Al-Jaafari, Sajjad Daneshgar, Anneli Folkesson-Dey, Roger M Enoka
The purpose of our study was to compare the influence of two types of transcutaneous electrical nerve stimulation (TENS) on the performance of older adults on the 6-min test of walking endurance and on the ability to maintain balance during upright standing. Twenty-six healthy older adults (72 ± 5.4 yrs) performed tests of motor function while TENS was applied to the tibialis anterior and rectus femoris muscles of each leg. Linear mixed models were used to compare the influence of TENS on walking distance in a 6-min test of walking endurance and on sway-area rate in tests of standing balance...
September 21, 2023: Journal of Electromyography and Kinesiology
Jérémie Bouvier, Augustin C Ogier, Cyril Martin, Alexandre Fouré
The use of shear wave elastography during voluntary contraction has enabled the non-invasive assessment of load sharing strategies between agonist muscles. However, the change in joint angle and voluntary contraction intensity can modify contribution between muscles. The aim of this study was to investigate the effect of knee joint angle on the local mechanical properties of the vastus medialis (VM) and the vastus lateralis (VL) during isometric submaximal voluntary contractions from shear wave elastography mapping...
September 21, 2023: Journal of Electromyography and Kinesiology
Robin Rohlén, Emma Lubel, Bruno Grandi Sgambato, Christian Antfolk, Dario Farina
The smallest voluntarily controlled structure of the human body is the motor unit (MU), comprised of a motoneuron and its innervated fibres. MUs have been investigated in neurophysiology research and clinical applications, primarily using electromyographic (EMG) techniques. Nonetheless, EMG (both surface and intramuscular) has a limited detection volume. A recent alternative approach to detect MUs is ultrafast ultrasound (UUS) imaging. The possibility of identifying MU activity from UUS has been shown by blind source separation (BSS) of UUS images, using optimal separation spatial filters...
September 20, 2023: Journal of Electromyography and Kinesiology
Chen Li, Ye Liu
The biceps femoris long head (BFLH) gains its properties from internal elements (fascicles and tendinous tissues) which behaviors remain poorly understood across BFLH regions and dynamic tasks. The aim of this study was to assess the in vivo behaviors of fascicles and tendinous tissue in the proximal and distal regions of BFLH during different dynamic knee and hip tasks. Twenty males performed the Nordic hamstring exercise (NHE) (n = 9) and Romanian deadlift (RDL) (n = 11). Activation of the BFLH was assessed using surface electromyography signals...
October 2023: Journal of Electromyography and Kinesiology
Javier Rodriguez-Falces, Armando Malanda, Cristina Mariscal, Imran Khan Niazi, Javier Navallas
INTRODUCTION: The EMG filling factor is an index to quantify the degree to which an EMG signal has been filled. Here, we tested the validity of such index to analyse the EMG filling process as contraction force was slowly increased. METHODS: Surface EMG signals were recorded from the quadriceps muscles of healthy subjects as force was gradually increased from 0 to 40% MVC. The sEMG filling process was analyzed by measuring the EMG filling factor (calculated from the non-central moments of the rectified sEMG)...
October 2023: Journal of Electromyography and Kinesiology
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