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Fine Wire EMG

Brooke Winder, Paul A Keri, David E Weberg, George J Beneck
Persons with low back pain (LBP) have demonstrated altered morphology and function of the deep multifidus (DM). This study examined the effects of postural cueing for increased lumbar lordosis on DM and longissimus thoracis (LT) activation during lumbar stabilization exercises (LSE) performed by persons with LBP. Nine adults with a history of chronic or recurrent LBP were recruited. Fine-wire EMG data was collected while participants performed 10 LSE's in neutral posture and with postural cueing. Percent maximum voluntary isometric contraction of L5 DM and T12 LT, and ratios of activation (DM/LT) were analyzed...
March 9, 2019: Journal of Electromyography and Kinesiology
Jenny V Suneby Jagers, Michael Ji, Bruce Rothwell, Paul A Easton
The traditional theophylline bronchodilator, aminophylline, is still widely used, especially in the treatment of COPD. The effects of aminophylline on ventilation and action of the costal diaphragm have been previously defined, but other respiratory muscles - notably the chest wall, are not well determined. Therefore, we investigated the effects of aminophylline on the Parasternal intercostal, a key obligatory inspiratory muscle, examining muscle length, shortening and EMG. We studied 11 awake canines, chronically implanted with sonomicrometer crystals and fine-wire EMG electrodes in the parasternal muscle...
February 21, 2019: Pulmonary Pharmacology & Therapeutics
Damien Moore, Tania Pizzari, Jodie McClelland, Adam I Semciw
CONTEXT: Many different rehabilitation exercises have been recommended in the literature to target the gluteus medius (GMed) muscle based mainly on single electrode, surface electromyography (EMG) measures. With the GMed consisting of three structurally and functionally independent segments there is uncertainty on whether these exercises will target the individual segments effectively. OBJECTIVE: To measure individual GMed segmental activity during six common, lower-limb rehabilitation exercises in healthy young adults, and determine if there are significant differences between the exercises for each segment...
February 12, 2019: Journal of Sport Rehabilitation
Dong Yoon Park, Joo Hyun Park
BACKGROUND: Anal sphincter needle electromyography (EMG) is a useful tool to evaluate various neurologic lesions. However, landmark-based needle placement has risks of missing the intended target including risk of bowel penetration. Ultrasound guidance has been widely used to enhance needle placement for various interventional procedures, but it has not been previously reported for use in anal sphincter EMG. OBJECTIVE: To demonstrate the accuracy of ultrasound-guided needle insertion into the external anal sphincter (EAS)...
November 29, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
Bernd Georg Lapatki, Ulrike Eiglsperger, Hans Jürgen Schindler, Johanna Radeke, Ales Holobar, Johannes Petrus van Dijk
OBJECTIVE: This study aimed to characterize amplitude topographies for masseter motor units (MUs) three-dimensionally, and to assess whether high-density surface electromyography (HDsEMG) is able to detect MU samples that represent the masseter's entire MU pool. METHODS: Ten healthy adult volunteers participated in the study, which combined three EMG techniques. A HDsEMG grid covering the entire masseter, and intramuscular fine-wire electrodes were used to obtain two independent MU samples for comparison...
January 19, 2019: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Talia Alenabi, Rachel L Whittaker, Soo Y Kim, Clark R Dickerson
This study aimed to evaluate the effect of arm posture on activation of the anterior and posterior regions of supraspinatus and the superior and middle regions of infraspinatus during resisted isometric arm elevations. Thirty-one healthy participants performed 18 isometric resistance exertions against a force cube in three elevation planes (flexion, scaption, abduction) and three elevation angles (30°, 90°, 150°) in maximal and sub-maximal resistance conditions. EMG data were obtained using four pairs of fine wire electrodes...
December 15, 2018: Journal of Electromyography and Kinesiology
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
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