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https://www.readbyqxmd.com/read/29339983/analysis-of-the-hamstring-muscle-activation-during-two-injury-prevention-exercises
#1
Alireza Monajati, Eneko Larumbe-Zabala, Mark Goss-Sampson, Fernando Naclerio
The aim of this study was to perform an electromyographic and kinetic comparison of two commonly used hamstring eccentric strengthening exercises: Nordic Curl and Ball Leg Curl. After determining the maximum isometric voluntary contraction of the knee flexors, ten female athletes performed 3 repetitions of both the Nordic Curl and Ball Leg Curl, while knee angular displacement and electromyografic activity of the biceps femoris and semitendinosus were monitored. No significant differences were found between biceps femoris and semitendinosus activation in both the Nordic Curl and Ball Leg Curl...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339205/agreement-of-musculoskeletal-ultrasound-and-clinical-assessment-of-shoulder-impairment-in-manual-wheelchair-users-with-various-duration-of-spinal-cord-injury
#2
Margaret Finley, David Ebaugh, Thomas Trojian
OBJECTIVE: To determine agreement of musculoskeletal ultrasound (MSK-US) findings of shoulder pathology and related shoulder special test results in individuals with varied duration of manual wheelchair (MWC) use following spinal cord injury (SCI) and determine if shoulder musculoskeletal impairments, per MSK-US and clinical examination, differed in individuals with SCI and varying duration of MWC use. DESIGN: Cross-sectional cohort study SETTING: Laboratory setting PARTICIPANTS: Twenty-three adult volunteers with SCI who used a MWC for community mobility...
January 12, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29338279/the-chondrocoracoideus-muscle-a-rare-anatomical-variant-of-the-pectoral-area
#3
Dionysios Venieratos, Alexandros Samolis, Maria Piagkou, Stergios Douvetzemis, Alexandrina Kourotzoglou, Kontantinos Natsis
OBJECTIVE: The study adds important information regarding the descriptive anatomy of a very rarely reported unilateral chondrocoracoideus muscle (of Wood). Additionally it highlights the concomitant muscular and neural alterations. CASE REPORT: The current case presents the occurrence of a chondrocoracoideus muscle situated left-sided, as an extension of the abdominal portion of the pectoralis major muscle (PM). The chondrocoracoideus coexisted with a contralateral atypical PM, partially blended with the clavicular fibers of the deltoid muscle...
November 2017: Acta Medica Academica
https://www.readbyqxmd.com/read/29337716/management-of-biceps-tendon-pathology-from-the-glenoid-to-the-radial-tuberosity
#4
Rachel M Frank, Eric J Cotter, Eric J Strauss, Laith M Jazrawi, Anthony A Romeo
Management of proximal and distal biceps tendon pathology is evolving. The long head of the biceps tendon, if inflamed, may be a pain-producing structure. In appropriately indicated patients, a symptomatic long head of the biceps tendon can be surgically managed via tenotomy, tenodesis, and/or superior labrum anterior to posterior repair. In some patients, primary superior labrum anterior to posterior pathology can be managed via biceps tenodesis. Determining which procedure is most appropriate and which technique and implant are preferred for a given patient with biceps tendon pathology is controversial...
January 15, 2018: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/29336361/muscle-magnetic-resonance-imaging-for-the-differentiation-of-multiple-acyl-coa-dehydrogenase-deficiency-and-immune-mediated-necrotizing-myopathy
#5
Ya-Wen Zhao, Xiu-Juan Liu, Wei Zhang, Zhao-Xia Wang, Yun Yuan
BACKGROUND: Clinically, it is difficult to differentiate multiple acyl-CoA dehydrogenase deficiency (MADD) from immune-mediated necrotizing myopathy (IMNM) because they display similar symptoms. This study aimed to determine whether muscle magnetic resonance imaging (MRI) could be used for differential diagnosis between MADD and IMNM. METHODS: The study evaluated 25 MADD patients, confirmed by muscle biopsy and ETFDH gene testing, and 30 IMNM patients, confirmed by muscle biopsy...
January 20, 2018: Chinese Medical Journal
https://www.readbyqxmd.com/read/29334581/gender-and-muscle-specific-responses-during-fatiguing-exercise
#6
Ethan C Hill, Terry J Housh, Cory M Smith, Richard J Schmidt, Glen O Johnson
The purpose of the present investigation was to examine potential gender-related differences in electromyographic (EMG) and mechanomyographic (MMG) responses during submaximal, concentric, isokinetic, forearm flexion muscle contractions. Twelve men and twelve women performed concentric peak torque trials prior to (pretest) and following (posttest) a fatiguing exercise bout that consisted of 50 submaximal (65% of concentric peak torque), concentric, isokinetic (60°·s), forearm flexion muscle contractions. Surface EMG and MMG signals were simultaneously recorded from the biceps brachii and brachioradialis muscles...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29333724/voluntary-activation-and-twitch-potentiation-of-the-elbow-flexors-across-supinated-neutral-and-pronated-forearm-orientations
#7
Sienna Kohn, Rowan R Smart, Jennifer M Jakobi
Elbow flexion force depends on forearm orientation with supinated and neutral being stronger than pronated. The purpose of this study was to assess the influence of forearm orientation on voluntary activation (VA), postactivation potentiation (PAP), and twitch properties. Eleven males (23 ± 3 years) performed isometric elbow flexion maximal voluntary contractions (MVC) in supinated, neutral, and pronated forearm orientations with supramaximal stimulation to the biceps brachii muscle belly before, during, and after the MVC...
January 2018: Physiological Reports
https://www.readbyqxmd.com/read/29332743/myoeletric-indices-of-fatigue-adopting-different-rest-intervals-during-leg-press-sets
#8
Humberto Miranda, Marianna Maia, Carlos G de Oliveira, Déborah Farias, Jurandir B da Silva, Vicente P Lima, Jeffrey M Willardson, Gabriel A Paz
INTRODUCTION: The purpose of this study was to examine the acute effect of different rest intervals between multiple sets of the 45° angled leg press exercise (LP45) on surface electromyographic (SEMG) spectral and amplitude indices of fatigue. METHODS: Fifteen recreationally trained females performed three protocols in a randomized crossover design; each consisting of four sets of 10 repetitions with 1 (P1), 3 (P3), or 5 (P5) minute rest intervals between sets...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332740/an-electromyographic-analysis-of-selected-asana-in-experienced-yogic-practitioners
#9
Kathleen Kelley, Katherine Slattery, Kaitlyn Apollo
The purpose of this study was to assess electromyographic (EMG) output of the anterior tibialis (TA), medial head of the gastrocnemius (GA), rectus femoris (RF), bicep femoris (BF), and gluteus medius (GM) in experienced yogic practitioners during selected yoga asana. A secondary purpose was to examine the differences in EMG output in unilateral V. bilateral standing yoga asana. The study was a single occasion descriptive design. Thirteen healthy yoga practitioners (1 male, 12 females, average age of 37.5) with more than five years of experience were recruited...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332059/analysis-of-skeletal-muscle-performance-using-piezoelectric-film-sensors
#10
Anat Ratnovsky, Emanuel Kusayev, Sara Naftali
A flexible piezoelectric thin film sensor has been proposed recently in several studies for detection of muscle movements. The objective of this study was to investigate the ability of this sensor to assess skeletal muscle performance and fatigue under isokinetic contractions. Simultaneous noninvasive measurements of muscles activity were done using surface electromyography (EMG) electrodes and two thin film piezoelectric sensors. Measurements were taken from the biceps during slow and fast elbow flexion with and without strong grip, during different weight lifting and from the gastrocnemius during treadmill marching at speeds of 4 and of 10 kph...
January 5, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29327223/one-bone-forearm-osteodesis-and-biceps-re-routing-to-correct-severe-supination-contracture-in%C3%A2-a-paediatric-patient-with-late-obstetric-brachial-plexus-palsy
#11
Ricardo Monreal
PURPOSE: The one-bone forearm arthrodesis has been performed to change the position of the forearm in children with fixed supination deformity due to upper extremity neurologic deficit. In this article, we present a retrospective review of children with late obstetric brachial plexus palsy who underwent palliative surgery to correct severe supination contracture by one-bone forearm osteodesis and biceps re-routing. This technique has not been described previously. MATERIALS AND METHODS: In this retrospective study, four consecutive patients with upper extremity weakness and severe supination contracture who underwent forearm osteodesis in neutral or slight pronation and biceps re-routing...
January 12, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29321108/surgical-stabilization-for-first-time-shoulder-dislocators-a-multicenter-analysis
#12
Caitlin M Rugg, Carolyn M Hettrich, Shannon Ortiz, Brian R Wolf, Alan L Zhang
BACKGROUND: Anterior shoulder dislocations in young patients are associated with high rates of recurrent instability. Although some surgeons advocate for surgical stabilization after a single dislocation event in this population, there is sparse research evaluating surgical treatment for first-time dislocators. METHODS: Patients undergoing surgical stabilization for anterior shoulder instability were prospectively enrolled at multiple institutions from 2015-2017 and stratified by number of dislocations before surgery...
January 8, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29319572/vascularized-composite-allotransplantation-of-the-elbow-joint-a-cadaveric-study
#13
Mitchell A Pet, Angelo B Lipira, Yusha Liu, Dennis Kao, Jason H Ko
BACKGROUND: Surgical options for the unreconstructable elbow are limited to arthrodesis, total arthroplasty, or osteoarticular allograft reconstruction. Each of these options is limited by severe functional impairment and/or high complication rates. Vascularized allotransplantation of the elbow joint has the potential to mitigate these complications. In this study, we describe our technique for harvesting the elbow for vascularized joint transplantation and demonstrate the flap's vascularity using contrast angiography...
January 9, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29317688/precontractile-optical-response-during-excitation-contraction-in-human-muscle-revealed-by-non-invasive-high-speed-spatiotemporal-nir-measurement
#14
Markus Lindkvist, Gabriel Granåsen, Christer Grönlund
During muscle contraction the excitation-contraction process mediates the neural input and mechanical output. Proper muscle function and body locomotion depends on the status of the elements in the same process. However, non-invasive and in-vivo methods to study this are not available. Here we show the existence of an optical response occurring during the excitation-contraction process in human biceps brachii muscle. We developed a non-invasive instrument from a photodiode array and light emitting diodes to detect spatially propagating (~5 m/s) and precontractile (~6 ms onset) optical signals closely related to the action potential during electrostimulation...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29315829/effects-of-acute-isometric-resistance-exercise-on-cervicomedullary-motor-evoked-potentials
#15
James L Nuzzo, Benjamin K Barry, Simon C Gandevia, Janet L Taylor
Cervicomedullary motor evoked potentials (CMEPs) in relaxed biceps brachii have been reported to facilitate after acute isometric exercise of the elbow flexors. This facilitation, which reflects either enhanced corticospinal transmission or increased motoneurone excitability, has only been documented in the limb posture used during exercise. In Experiment 1, we tested if these spinal changes "transfer" to a second posture. Fourteen individuals completed 12 sets of high-force isometric contractions of the elbow flexors with the forearm pronated...
January 6, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29315583/the-effect-of-cooking-temperatures-on-the-aggregation-and-digestion-rate-of-myofibrillar-proteins-in-jinhua-ham
#16
Chang-Yu Zhou, Dao-Dong Pan, Yang-Ying Sun, Chun-Bao Li, Xing-Lian Xu, Jin-Xuan Cao, Guang-Hong Zhou
BACKGROUND: In order to evaluate the effect of cooking temperatures on the nutrition quality of dry-cured hams, 60 biceps femoris samples from 16 Jinhua hams were divided into four groups (the control, 70, 100 and 120 °C) and cooked for 30 min. Carbonyls content, sulfhydryl groups, surface hydrophobicity, microstructure, proteins aggregation and digestibility of myofibrillar proteins were investigated. RESULTS: Cooking promoted the carbonylation and decreased sulfhydryl groups in temperatures-dependent ways...
January 9, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29314867/location-of-rotator-cuff-tear-initiation-a-magnetic-resonance-imaging-study-of-191-shoulders
#17
Jeung Yeol Jeong, Seul Ki Min, Keun Min Park, Yong Bok Park, Kwang Joon Han, Jae Chul Yoo
BACKGROUND: Degenerative rotator cuff tears (RCTs) are generally thought to originate at the anterior margin of the supraspinatus tendon. However, a recent ultrasonography study suggested that they might originate more posteriorly than originally thought, perhaps even from the isolated infraspinatus (ISP) tendon, and propagate toward the anterior supraspinatus. Hypothesis/Purpose: It was hypothesized that this finding could be reproduced with magnetic resonance imaging (MRI). The purpose was to determine the most common location of degenerative RCTs by using 3-dimensional multiplanar MRI reconstruction...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29309450/biceps-tenodesis-a-comparison-of-tendon-to-bone-and-tendon-to-tendon-healing-in-a-rat-model
#18
Ekaterina Urch, Samuel A Taylor, Prem N Ramkumar, Paul Enker, Stephen B Doty, Alex E White, Demetris Delos, Mary E Shorey, Stephen J O'Brien
In this article, we report on the differences in the healing biology of biceps tenodesis performed on either bone or soft tissue in a rat model. This work provides further insight into what may be the optimal strategy for managing biceps-labrum complex disease.
November 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29309328/a-new-option-for-the-reconstruction-of-primary-or-recurrent-ischial-pressure-sores-hamstring-adductor-magnus-muscle-advancement-flap-and-direct-closure
#19
Jin Sik Burm, Jungil Hwang, Yung Ki Lee
BACKGROUND: Owing to the high recurrence rates of ischial pressure sores, surgeons should consider the possibility of future secondary flap surgery during flap selection. The purpose of this article is to present a new surgical option for the reconstruction of primary or recurrent ischial pressure sores using a simple hamstring-adductor magnus advancement flap and direct closure. METHODS: After horizontal fusiform skin excision, complete bursa excision and ischiectomy were performed...
January 5, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29309090/effect-of-ultrasonography-on-student-learning-of-shoulder-anatomy-and-landmarks
#20
Kristen D de Vries, Rebecca Brown, Joseph Mazzie, Min-Kyung Jung, Sheldon C Yao, Michael J Terzella
Context: Ultrasonography is becoming more common in clinical use, and it has been shown to have promising results when introduced into medical school curricula. Objective: To determine whether the use of ultrasonography as an educational supplement can improve osteopathic medical students' confidence and ability to locate 4 specific shoulder anatomical landmarks: the coracoid process, the transverse process of T1, the long head of the biceps within the bicipital groove, and the supraspinatus tendon...
January 1, 2018: Journal of the American Osteopathic Association
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