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Fine Wire EMG

Andrew J Tweedell, Matthew S Tenan, Courtney A Haynes
INTRODUCTION: We characterize the agreement between the timing of muscle contraction onset detected by surface EMG, fine wire EMG, and motion-mode ultrasound for improved interpretations of clinical outcomes. METHODS: Eighteen healthy adults participated. Differences in contraction onset were compared between surface EMG, fine wire EMG and motion-mode ultrasound collected during concentric contractions of the vastus lateralis and biceps brachii. RESULTS: The mean difference of 13...
December 7, 2018: Muscle & Nerve
Maoqi Chen, Xu Zhang, Ping Zhou
The progressive FastICA peel-off (PFP) is a recently developed blind source separation approach for high-density surface EMG decomposition. This study explores a novel application of PFP for automatic decomposition of multi-channel intramuscular electromyogram signals. The automatic PFP (APFP) was used to decompose an open access multichannel intramuscular EMG dataset, simultaneously collected from the brachioradialis muscle using 6 to 8 fine wire or needle electrodes. Given usually limited number of intramuscular electrodes compared with high-density surface EMG recording, a modification was made to the original APFP framework to dramatically increase the decomposition yield...
November 20, 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Tim J L Raven, Lise R Lothe, Gunnar Sandbæk, Torsten Eken
Precise electrode placement is essential for obtaining useful electromyographic (EMG) recordings. Our aim was to develop a protocol for computerized-tomography (CT) guided fine-wire (FW) electrode placement that permits confirmation of the final electrode position in the deep posterior cervical multifidus (CM). FW-EMG electrodes were custom-made from three 50-µm diameter Teflon-insulated platinum/iridium wires. The electrodes were inserted bilaterally in the CM in 15 healthy adult subjects through a 45-mm cannula under CT guidance...
December 2018: Journal of Electromyography and Kinesiology
Brooke Odle, Jeffrey Reinbolt, Gail Forrest, Trevor Dyson-Hudson
Upper limb overuse injuries are common in manual wheelchair users with spinal cord injury. Patient-specific in silico models enhance experimental biomechanical analyses by estimating in vivo shoulder muscle and joint contact forces. Current models exclude deep shoulder muscles that have important roles in wheelchair propulsion. Freely accessible patient-specific models have not been generated for persons with tetraplegia, who have a greater risk for shoulder pain and injury. The objectives of this work were to (i) construct a freely accessible, in silico, musculoskeletal model capable of generating patient-specific dynamic simulations of wheelchair propulsion and (ii) establish proof-of-concept with data obtained from an individual with tetraplegia...
September 25, 2018: Medical & Biological Engineering & Computing
Tsuyoshi Ichikawa, Masanori Yokoba, Masahiko Kimura, Manaka Shibuya, Paul A Easton, Masato Katagiri
NEW FINDINGS: What is the central question of this study? Maximal sniff nasal inspiratory and reverse sniff nasal expiratory pressures are measured as inspiratory and expiratory muscle strength, respectively. Is the genioglossus muscle activated during short maximal inspiratory and expiratory efforts through the nose? What is the main finding and its importance? Genioglossus muscle activity occurred with inspiratory muscle activity during a maximal sniff and with expiratory muscle activity during a maximal reverse sniff...
December 2018: Experimental Physiology
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...
December 2018: Journal of Electromyography and Kinesiology
Nathalie Mobargha, Susanne Rein, Elisabet Hagert
PURPOSE: The dorsoradial ligament (DRL) is essential for stability of the first carpometacarpal joint (CMC1) and is innervated with nerve endings and mechanoreceptors known to contribute to joint proprioception. The influence of these nerve endings on the neuromuscular stability of CMC1 is not yet known. This study investigated whether a ligamento-muscular reflex pathway is present between the DRL and CMC1 muscles. METHODS: Ten healthy subjects (5 women and 5 men, mean age 28 years; range, 24-37 years) were included...
August 26, 2018: Journal of Hand Surgery
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...
October 2018: Journal of Electromyography and Kinesiology
Szu-Ping Lee, Jo Armour Smith, Matthew Kimber, Kelsey Houk
BACKGROUND: Low back pain (LBP) is commonly associated with paraspinal muscle dysfunctions. A method to study deep lumbar paraspinal (ie, multifidus) muscle function and neuromuscular activation pattern is intramuscular electromyography (EMG). Previous studies have shown that the procedure does not significantly impact muscle function during activities involving low-level muscle contractions. However, it is currently unknown how muscular function and activation are affected during high-exertion contractions...
May 30, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
N N Giannakopoulos, H J Schindler, D Hellmann
The objective of this study was to analyse the co-contraction behaviour of jaw and neck muscles during force-controlled experimental grinding in the supine position. Twelve symptom-free subjects were enrolled in the experimental study. Electromyographic (EMG) activity of semispinalis capitis, splenius capitis and levator scapulae muscles was recorded bilaterally with intramuscular fine-wire electrodes, whereas that of sternocleidomastoideus, infrahyoidal, suprahyoidal, masseter and anterior temporalis muscles were registered with surface electrodes...
July 2018: Journal of Oral Rehabilitation
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...
August 2018: Journal of Electromyography and Kinesiology
Shanshan Zhang, Yi Xu, Xiulan Han, Wen Wu, Yan Tang, Chuhuai Wang
Surface electromyography (sEMG) studies have indicated that chronic low back pain (cLBP) involves altered electromyographic activity and morphological structure of the lumbar multifidus (LM) beyond pain perception; however, most studies have evaluated the superficial lumbar multifidus. It is difficult to record electromyography (EMG) signals from the deep multifidus (DM) to determine the neuromuscular activation patterns, making it difficult to determine the relationship between functional and structural changes in cLBP...
April 25, 2018: Scientific Reports
Damien Moore, Adam I Semciw, Jodie McClelland, Henry Wajswelner, Tania Pizzari
CONTEXT: The gluteus minimus (GMin) muscle consists of two uniquely oriented segments that have potential for independent function, and have different responses to pathology and ageing. For healthy, young adults it is unknown which rehabilitation exercises specifically target the individual segments. OBJECTIVE: To quantify segmental GMin activity for six common lower limb rehabilitation exercises in healthy young adults, and determine if significant differences exist in segmental activity levels between the exercises...
March 27, 2018: Journal of Sport Rehabilitation
Matthew L Benn, Tania Pizzari, Leanne Rath, Kylie Tucker, Adam I Semciw
Cadaveric studies indicate that adductor magnus is structurally partitioned into at least two regions. The aim of this study was to investigate the direction-specific actions of proximal and distal portions of adductor magnus, and in doing so determine if these segments have distinct functional roles. Fine-wire EMG electrodes were inserted into two portions of adductor magnus of 12 healthy young adults. Muscle activity was recorded during maximum voluntary isometric contractions (MVICs) across eight tests (hip flexion/extension, internal/external rotation, abduction, and adduction at 0°, 45°, and 90° hip flexion)...
May 2018: Clinical Anatomy
Filiz Ateş, Brenda L Davies, Swati Chopra, Krista Coleman-Wood, William J Litchy, Kenton R Kaufman
Intramuscular pressure (IMP) is the hydrostatic fluid pressure that is directly related to muscle force production. Electromechanical delay (EMD) provides a link between mechanical and electrophysiological quantities and IMP has potential to detect local electromechanical changes. The goal of this study was to assess the relationship of IMP with the mechanical and electrical characteristics of the tibialis anterior muscle (TA) activity at different ankle positions. We hypothesized that (1) the TA IMP and the surface EMG (sEMG) and fine-wire EMG (fwEMG) correlate to ankle joint torque, (2) the isometric force of TA increases at increased muscle lengths, which were imposed by a change in ankle angle and IMP follows the length-tension relationship characteristics, and (3) the electromechanical delay (EMD) is greater than the EMD of IMP during isometric contractions...
2018: Frontiers in Physiology
Martin Eriksson Crommert, Anna Bjerkefors, Olga Tarassova, Maria M Ekblom
The purpose of this study was to investigate effects of common modifications of trunk curl-up exercise on the involvement of the abdominal muscles, particularly the deepest muscle layer, transversus abdominis (TrA). Ten healthy females performed five different variations of the trunk curl-up at a standardized speed, varying the exercise by assuming three different arm positions and applying left and right twist. Indwelling fine-wire electromyography (EMG) electrodes were used to record from TrA, obliquus internus (OI), obliquus externus (OE) and rectus abdominis (RA) unilaterally on the right side...
January 9, 2018: Journal of Strength and Conditioning Research
Omid Alizadehkhaiyat, Margaret M Roebuck, Ahmed T Makki, Simon P Frostick
Muscle fatigue affecting glenohumeral and/or scapular muscles is suggested as one of the contributing factors to the development of subacromial impingement syndrome (SAIS). Nonetheless, the fatigability of shoulder girdle muscles in association with the pathomechanics of SAIS has not been reported. This study aimed to measure and compare fatigue progression within the shoulder girdle musculature of patients and healthy controls. 75 participants including 39 patients (20 females; 19 males) and 36 healthy controls (15 females; 21 males) participated in the study...
February 2018: Journal of Electromyography and Kinesiology
Nicole Clark, Michael L Voight, Ashley M Campbell, Sherry Pierce, Pat Sells, Ryan Cook, Clint Henley, Lindsey Schiller
Background: Segmental rolling has been utilized as an assessment and intervention tool to identify and affect dysfunction of the upper quarter, core, and lower quarter. One theory to explain dysfunctional segmental rolling is a lack of segmental spinal control / stabilization. Faulty muscle firing sequencing has been related to poor spinal stability, however to date, no assessment tool exists to evaluate a patient's motor coordination of local and global musculature. Purpose: The purpose of this study was to assess the temporal sequence of lumbar multifidus activation associated with anterior deltoid activation, and to determine if faulty sequencing was associated with the inability to segmentally roll in subjects without mobility restrictions...
November 2017: International Journal of Sports Physical Therapy
C Geroin, G Squintani, A Morini, F Donato, Nicola Smania, Maria Giovanna Gandolfi, S Tamburin, Alfonso Fasano, Michele Tinazzi
Patients with Parkinson's disease (PD) and Pisa syndrome (PS) may present tonic dystonic or compensatory (i.e. acting against gravity) hyperactivity in the paraspinal and non-paraspinal muscles. Electromyographic (EMG) activity was measured in nine patients with PD and PS, three with PD without PS, and five healthy controls. Fine-wire intramuscular electrodes were inserted bilaterally into the iliocostalis lumborum (ICL), iliocostalis thoracis (ICT), gluteus medius (GM), and external oblique (EO) muscles. The root mean square (RMS) of the EMG signal was calculated and normalized for each muscle...
July 2017: Functional Neurology
Hiroshi Akuzawa, Atsushi Imai, Satoshi Iizuka, Naoto Matsunaga, Koji Kaneoka
OBJECTIVE: Exercises for lower leg muscles are important to improve function. To examine the influence of foot position on lower leg muscle activity during heel raises. DESIGN: Cross-sectional laboratory study. SETTING: Laboratory. PARTICIPANTS: Fourteen healthy men participated in this study. MAIN OUTCOME MEASURES: The muscle activity levels of the tibialis posterior (TP), peroneus longus (PL), flexor digitorum longus (FDL) and medial gastrocnemius (MG) were measured...
November 2017: Physical Therapy in Sport
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