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"Muscle architecture"

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https://www.readbyqxmd.com/read/29150270/m-biceps-femoris-a-wolf-in-sheep-s-clothing-the-downside-of-a-lower-limb-injury-prevention-training
#1
Thomas Ertelt, Thomas Gronwald
Both, hamstring and ACL injuries are among the most typical injuries, particularly in change of direction and high speed running sports. They're also difficult to treat. Therefore, in the past few years, sports medicine practitioners and exercise scientists have mainly been focusing on the development and implementation of preventive programs in order to reduce the number of lower limb injuries, mainly by improving knee alignment. A number of studies have been able to prove the success of these training interventions, which are mainly addressing sensorimotor abilities and plyometric activities...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29146686/specific-force-of-the-vastus-lateralis-in-adults-with-achondroplasia
#2
David Thomas Sims, Gladys L Onambele-Pearson, Adrian Burden, Carl Payton, Christopher I Morse
Achondroplasia is a clinical condition defined by shorter stature and disproportionate limb length. Force production in able-bodied individuals (controls) is proportional to muscle size, but given the disproportionate nature of Achondroplasia, normalising to anatomical cross sectional area (ACSA) is inappropriate. The aim of this study was to assess specific force of the vastus lateralis (VL) in 10 adults with Achondroplasia (22 ±3 yrs) and 18 gender matched controls (22 ±2 yrs). Isometric torque (iMVCτ) of the dominant knee extensors (KE) and in vivo measures of VL muscle architecture, volume, activation and patella tendon moment arm were used to calculate VL physiological CSA (PCSA), fascicle force and specific force in both groups...
November 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29146092/ultrasonographic-evaluation-of-changes-in-the-muscle-architecture-of-the-gastrocnemius-with-botulinum-toxin-treatment-for-lower-extremity-spasticity-in-children-with-cerebral-palsy
#3
Akihiro Kawano, Taiichiro Yanagizono, Ichiro Kadouchi, Tetsuya Umezaki, Etsuo Chosa
BACKGROUND: Botulinum toxin A treatment involves injecting botulinum toxin A to relax muscle spasticity. Using ultrasonography, this study examined changes in the muscle architecture before and after treatment to evaluate the influence of botulinum toxin A injection on muscles. METHODS: The participants included 18 children (mean age, 6.2 years) with cerebral palsy who were treated with botulinum toxin A for lower extremity spasticity and 27 healthy children (mean age, 6...
November 13, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29140178/infraspinatus-cross-sectional-area-and-shoulder-range-of-motion-change-following-live-game-baseball-pitching
#4
Brett S Pexa, Eric D Ryan, Elizabeth E Hibberd, Elizabeth Teel, Terri Jo Rucinski, Joseph B Myers
CONTEXT: Following a baseball pitching bout, changes can occur to glenohumeral range of motion that could be linked to injury. These effects are in part due to the posterior shoulder's eccentric muscle activity, which can disrupt muscle contractile elements and lead to changes in muscle cross sectional area (CSA), as measured by ultrasound. OBJECTIVE: To assess changes in muscle CSA, and range of motion immediately before and after pitching, and days 1-5 following pitching...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29139316/association-of-gastrocnemius-muscle-stiffness-with-passive-ankle-joint-stiffness-and-sex-related-difference-in-the-joint-stiffness
#5
Kintaro Chino, Hideyuki Takashi
Passive ankle joint stiffness is affected by all structures located within and over the joint, and is greater in men than in women. Localized muscle stiffness can be assessed by ultrasound shear wave elastography, and muscle architecture such as fascicle length and pennation angle can be measured by B-mode ultrasonography. Thus, we assessed localized muscle stiffness of the medial gastrocnemius (MG) with consideration of individual variability in the muscle architecture, and examined the association of the muscle stiffness with passive ankle joint stiffness and the sex-related difference in the joint stiffness...
November 15, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29116573/an-evidence-based-framework-for-strengthening-exercises-to-prevent-hamstring-injury
#6
REVIEW
Matthew N Bourne, Ryan G Timmins, David A Opar, Tania Pizzari, Joshua D Ruddy, Casey Sims, Morgan D Williams, Anthony J Shield
Strength training is a valuable component of hamstring strain injury prevention programmes; however, in recent years a significant body of work has emerged to suggest that the acute responses and chronic adaptations to training with different exercises are heterogeneous. Unfortunately, these research findings do not appear to have uniformly influenced clinical guidelines for exercise selection in hamstring injury prevention or rehabilitation programmes. The purpose of this review was to provide the practitioner with an evidence-base from which to prescribe strengthening exercises to mitigate the risk of hamstring injury...
November 7, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29112569/stromal-cell-derived-factor-1-plasmid-regenerates-both-smooth-and-skeletal-muscle-after-anal-sphincter-injury-in-the-long-term
#7
Li Sun, Mei Kuang, Marc Penn, Margot S Damaser, Massarat Zutshi
BACKGROUND: Regenerating muscle at a time remote from injury requires re-expression of cytokines to attract stem cells to start and sustain the process of repair. OBJECTIVE: We aimed to evaluate the sustainability of muscle regeneration after treatment with a nonviral plasmid expressing stromal cell-derived factor 1. DESIGN: This was a randomized study. SETTINGS: The study was conducted with animals in a single research facility...
December 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/29098300/-ultrasound-of-muscular-diseases-in-children-and-adolescents
#8
REVIEW
L von Rohden, Julian H W Jürgens
BACKGROUND: The increasing number of treatable hereditary neuromuscular diseases in children requires a diagnostic tool that can quickly, safely, and noninvasively identify affected patients directly after birth or when showing initial clinical symptoms. With clinical analysis alone, this is very difficult. IMAGING MODALITY: Near-field sonography of skeletal muscles has gradually become established as a successful method over the last 35 years. METHODOLOGICAL INNOVATIONS: Examination is performed using a strictly standardized protocol in isotopic muscle regions and with standardized sections and application parameters...
November 2, 2017: Der Radiologe
https://www.readbyqxmd.com/read/29057578/label-free-imaging-of-redox-status-and-collagen-deposition-showing-metabolic-differences-in-the-heart
#9
Janna L Morrison, Alexandra Sorvina, Jack R T Darby, Christie A Bader, Mitchell C Lock, Mike Seed, Tim Kuchel, Sally E Plush, Douglas A Brooks
The heart has high metabolic demand to maintain function. The primary source of energy supply to support correct contractile muscle function differs between a fetus and an adult. In fetal life, ATP is primarily generated by glycolysis and lactate oxidation, whereas following birth there is a shift towards a reliance on mitochondrial metabolism and fatty acid oxidation. This change in metabolic status is an adaptation to different fuel availability, oxygenation and growth patterns. Here, we have employed two-photon excitation fluorescence microscopy to define the relationship between two critical metabolic co-factors NAD(P)H and FAD, effectively utilising a redox ratio to differentiate between the metabolic status in fetal (proliferative) and adult (quiescent/hypertrophic) hearts...
October 23, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/29027683/ultrasonographic-measurement-of-the-biceps-femoris-long-head-muscle-architecture
#10
Sandro R Freitas, João Marmeleira, Maria João Valamatos, Anthony Blazevich, Pedro Mil-Homens
OBJECTIVES: Biceps femoris long-head architectural assessment using ultrasonography (US) has not been previously described in detail for both acquisition (image capture) and digitization (image measurement) processes, and the effect of the US window width is unknown. This study aimed to describe the reliability and test-retest minimum detectable difference of US-based biceps femoris architectural measurements. METHODS: Muscle length was determined by marking the muscle-tendon junction distances...
October 13, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29023326/combined-effects-of-static-stretching-and-electrical-stimulation-on-joint-range-of-motion-and-muscle-strength
#11
Takamasa Mizuno
The purpose of this study was to examine the effects of the combination of static stretching (SS) and electrical stimulation (ES) for 8 weeks on joint range of motion (ROM), muscle strength, and muscle architecture. Thirty-one subjects were divided into three groups: the SS combined with ES (SS+ES) group, SS group, or control group. The SS+ES group performed calf stretching simultaneously with ES to the gastrocnemius medialis, while the SS group performed calf stretching only. The training regimen consisted of four 30 sec sets of stretching, with 30 sec rest intervals, 3 days per week for 8 weeks...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28973130/architecture-of-the-suprahyoid-muscles-a-volumetric-musculoaponeurotic-analysis
#12
Stephanie M Shaw, Rosemary Martino, Ali Mahdi, Forrest Kip Sawyer, Sunita Mathur, Andrew Hope, Anne M Agur
Purpose: Suprahyoid muscles play a critical role in swallowing. The arrangement of the fiber bundles and aponeuroses has not been investigated volumetrically, even though muscle architecture is an important determinant of function. Thus, the purpose was to digitize, model in three dimensions, and quantify the architectural parameters of the suprahyoid muscles to determine and compare their relative functional capabilities. Method: Fiber bundles and aponeuroses from 11 formalin-embalmed specimens were serially dissected and digitized in situ...
October 17, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28882331/demonstration-of-extended-field-of-view-ultrasound-s-potential-to-increase-the-pool-of-muscles-for-which-in-vivo-fascicle-length-is-measurable
#13
Amy N Adkins, Patrick W Franks, Wendy M Murray
Static, B-mode ultrasound is the most common method of measuring fascicle length in vivo. However, most forearm muscles have fascicles that are longer than the field-of-view of traditional ultrasound (T-US). As such, little work has been done to quantify in vivo forearm muscle architecture. The extended field-of-view ultrasound (EFOV-US) method, which fits together a sequence of B-mode images taken from a continuous ultrasound scan, facilitates direct measurements of longer, curved fascicles. Here, we test the validity and reliability of the EFOV-US method for obtaining fascicle lengths in the extensor carpi ulnaris (ECU)...
October 3, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28869034/plasticity-and-function-of-human-skeletal-muscle-in-relation-to-disuse-and-rehabilitation-influence-of-ageing-and-surgery
#14
Charlotte Suetta
In order to study the influence of disuse and aging on skeletal muscle homeostasis, different human models were employed. Effects of chronic disuse were investigated in elderly patients suffering from uni-lateral hip-osteoarthritis, whereas the effect of short-term disuse (4 and 14 days of unilateral lower limb immobilisation) was assessed in healthy young and old individuals. In summary, chronic muscle disuse in the elderly was associated with marked quantitative as well as qualitative neuromuscular impairments...
August 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28859831/automatic-reconstruction-of-the-muscle-architecture-from-the-superficial-layer-fibres-data
#15
Josef Kohout, David Cholt
BACKGROUND AND OBJECTIVE: Physiological cross-sectional area (PCSA) of a muscle plays a significant role in determining the force contribution of muscle fascicles to skeletal movement. This parameter is typically calculated from the lengths of muscle fibres selectively sampled from the superficial layer of the muscle. However, recent studies have found that the length of fibres in the superficial layer often differs significantly (p < 0.5) from the length of fibres in the deep layer...
October 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28801950/can-chronic-stretching-change-the-muscle-tendon-mechanical-properties-a-review
#16
REVIEW
Sandro R Freitas, Bruno Mendes, Guillaume Le Sant, Ricardo J Andrade, Antoine Nordez, Zoran Milanovic
PURPOSE: It is recognized that stretching is an effective method to chronically increase the joint range of motion. However, the effects of stretching training on the muscle-tendon structural properties remain unclear. This systematic review with meta-analysis aimed to determine whether chronic stretching alter the muscle-tendon structural properties. METHODS: Published papers regarding longitudinal stretching (static, dynamic and/or PNF) intervention (either randomized or not) in humans of any age and health status, with more than 2 weeks in duration and at least 2 sessions per week, were searched in PubMed, PEDro, ScienceDirect and ResearchGate databases...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28797897/ultrasonographic-quantification-of-architectural-response-in-tibialis-anterior-to-neuromuscular-electrical-stimulation
#17
Emilie Simoneau-Buessinger, Sébastien Leteneur, Alix Bisman, François Gabrielli, Jennifer Jakobi
While muscle contraction in voluntary efforts has been widely investigated, little is known about contraction during neuromuscular electrical stimulation (NMES). The aim of this study was to quantify in vivo muscle architecture of agonist and antagonist muscles at the ankle joint during NMES. Muscle fascicle lengths and pennation angles of the tibialis anterior (TA) and lateral gastrocnemius muscles were assessed via ultrasonography in 8 healthy young males. Measures were obtained during maximal NMES and torque-matched voluntary dorsiflexion contractions...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28793853/equine-skeletal-muscle-adaptations-to-exercise-and-training-evidence-of-differential-regulation-of-autophagosomal-and-mitochondrial-components
#18
Kenneth Bryan, Beatrice A McGivney, Gabriella Farries, Paul A McGettigan, Charlotte L McGivney, Katie F Gough, David E MacHugh, Lisa M Katz, Emmeline W Hill
BACKGROUND: A single bout of exercise induces changes in gene expression in skeletal muscle. Regular exercise results in an adaptive response involving changes in muscle architecture and biochemistry, and is an effective way to manage and prevent common human diseases such as obesity, cardiovascular disorders and type II diabetes. However, the biomolecular mechanisms underlying such responses still need to be fully elucidated. Here we performed a transcriptome-wide analysis of skeletal muscle tissue in a large cohort of untrained Thoroughbred horses (n = 51) before and after a bout of high-intensity exercise and again after an extended period of training...
August 9, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28783537/investigation-of-the-hd-semg-probability-density-function-shapes-with-varying-muscle-force-using-data-fusion-and-shape-descriptors
#19
Mariam Al Harrach, Sofiane Boudaoud, Vincent Carriou, Jeremy Laforet, Adrien J Letocart, Jean-François Grosset, Frédéric Marin
This work presents an evaluation of the High Density surface Electromyogram (HD-sEMG) Probability Density Function (PDF) shape variation according to contraction level. On that account, using PDF shape descriptors: High Order Statistics (HOS) and Shape Distances (SD), we try to address the absence of a consensus for the sEMG non-Gaussianity evolution with force variation. This is motivated by the fact that PDF shape information are relevant in physiological assessment of the muscle architecture and function, such as contraction level classification, in complement to classical amplitude parameters...
August 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28737609/the-effects-of-supplementary-low-load-blood-flow-restriction-training-on-morphological-and-performance-based-adaptations-in-team-sport-athletes
#20
Brendan R Scott, Jeremiah J Peiffer, Paul S R Goods
Scott, BR, Peiffer, JJ, and Goods, PSR. The effects of supplementary low-load blood flow restriction training on morphological and performance-based adaptations in team sport athletes. J Strength Cond Res 31(8): 2147-2154, 2017-Low-load resistance training with blood flow restriction (BFR) may be a method to enhance muscular development even in trained athletes. This study aimed to assess whether supplemental low-load BFR training can improve muscle size, strength, and physical performance characteristics in team sport athletes...
August 2017: Journal of Strength and Conditioning Research
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