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"Muscle architecture"

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https://www.readbyqxmd.com/read/29334674/relationship-between-jumping-abilities-and-skeletal-muscle-architecture-of-lower-limbs-in-humans-systematic-review-and-meta-analysis
#1
J D Ruiz-Cárdenas, J J Rodríguez-Juan, J Ríos-Díaz
The aim of this study was to examine the influence of skeletal muscle architecture (SMA) features measured by 2-D ultrasonography on jumping performance in humans. A systematic review and meta-analysis was conducted, registry number: CRD42016043602. The scientific literature was systematically searched in eight databases, last run on March 14th, 2017. Cross-sectional studies focused on the association between SMA features and vertical jumping performance were selected. A random-effects model was used to analyze the influence of lower-limb SMA and maximal jump height...
January 12, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29330959/non-destructive-determination-of-muscle-architectural-variables-through-the-use-of-dicect
#2
Edwin Dickinson, Heiko Stark, Kornelius Kupczik
The fascicular architecture of skeletal muscle dictates functional parameters such as force production and contractile velocity. Muscle microarchitecture is typically determined by means of manual dissection, a technique that is inherently destructive to specimens. Furthermore, fascicle lengths and pennation angles are commonly assessed at only a limited number of sampling sites per muscle. We present the results of a digital technique to non-destructively assess muscle architectural variables for three jaw-adductor muscles within a specimen of the cercopithecine primate Macaca fascicularis (crab-eating macaque)...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330947/dietary-correlates-of-primate-masticatory-muscle-fiber-architecture
#3
Adam Hartstone-Rose, Ashley R Deutsch, Carissa L Leischner, Francisco Pastor
Analyses of masticatory muscle architecture-specifically fascicle length (FL; a correlate of muscle stretch and contraction speed) and physiological cross-sectional area (PCSA; a correlate of force)-reveal soft-tissue dietary adaptations. For instance, consumers of large, soft foods are expected to have relatively long FL, while consumers of obdurate foods are expected to have relatively high PCSA. Unfortunately, only a few studies have analyzed these variables across large primate samples-an order of particular interest because it is our own...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29327389/multivariate-analysis-of-variations-in-intrinsic-foot-musculature-among-hominoids
#4
Motoharu Oishi, Naomichi Ogihara, Daisuke Shimizu, Yasuhiro Kikuchi, Hideki Endo, Yumi Une, Satoshi Soeta, Hajime Amasaki, Nobutsune Ichihara
Comparative analysis of the foot muscle architecture among extant great apes is important for understanding the evolution of the human foot and, hence, human habitual bipedal walking. However, to our knowledge, there is no previous report of a quantitative comparison of hominoid intrinsic foot muscle dimensions. In the present study, we quantitatively compared muscle dimensions of the hominoid foot by means of multivariate analysis. The foot muscle mass and physiological cross-sectional area (PCSA) of five chimpanzees, one bonobo, two gorillas, and six orangutans were obtained by our own dissections, and those of humans were taken from published accounts...
January 12, 2018: Journal of Anatomy
https://www.readbyqxmd.com/read/29304114/comparison-of-calf-muscle-architecture-between-asian-children-with-spastic-cerebral-palsy-and-typically-developing-peers
#5
Ying Chen, Lu He, Kaishou Xu, Jinling Li, Buyun Guan, Hongmei Tang
OBJECTIVE: To compare the muscle thickness, fascicle length, and pennation angle of the gastrocnemius, soleus, and tibialis anterior between Asian children with spastic cerebral palsy (CP) and typically developing (TD) peers. METHODS: This cross-sectional study involved a total of 72 children with hemiplegic CP (n = 24), and diplegic CP (n = 24) and their TD peers (n = 24). Muscle architecture was measured at rest using ultrasound. Clinical measures included gross motor function and a modified Ashworth scale...
2018: PloS One
https://www.readbyqxmd.com/read/29289349/motor-units-in-vastus-lateralis-and-in-different-vastus-medialis-regions-show-different-firing-properties-during-low-level-isometric-knee-extension-contraction
#6
Leonardo Mendes Leal de Souza, Hélio Veiga Cabral, Liliam Fernandes de Oliveira, Taian Martins Vieira
Architectural differences along vastus medialis (VM) and between VM and vastus lateralis (VL) are considered functionally important for the patellar tracking, knee joint stability and knee joint extension. Whether these functional differences are associated with a differential activity of motor units between VM and VL is however unknown. In the present study, we, therefore, investigate neuroanatomical differences in the activity of motor units detected proximo-distally from VM and from the VL muscle. Nine healthy volunteers performed low-level isometric knee extension contractions (20% of their maximum voluntary contraction) following a trapezoidal trajectory...
December 28, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29258751/intraoperative-and-biomechanical-studies-of-human-vastus-lateralis-and-vastus-medialis-sarcomere-length-operating-range
#7
Jongsang Son, Andy Indresano, Kristin Sheppard, Samuel R Ward, Richard L Lieber
The vast majority of musculoskeletal models are not validated against primary experimental data. Conversely, most human experimental measurements are not explained theoretically using models to provide a mechanistic understanding of experimental results. Here we present a study with both primary human data and primary modeling data. Intraoperative sarcomere length was measured on the human vastus lateralis (VL) and vastus medialis (VM) muscles (n = 8) by laser diffraction. These data were compared to a biomechanical model based on muscle architecture and moment arms obtained independently from cadaveric specimens (n = 9)...
December 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29214464/reliability-of-a-semi-automated-algorithm-for-the-vastus-lateralis-muscle-architecture-measurement-based-on-ultrasound-images
#8
Robert Marzilger, Kirsten Legerlotz, Chrystalla Panteli, Sebastian Bohm, Adamantios Arampatzis
PURPOSE: The assessment of muscle architecture with B-mode ultrasound is an established method in muscle physiology and mechanics. There are several manual, semi-automated and automated approaches available for muscle architecture analysis from ultrasound images or videos. However, most approaches have limitations such as workload, subjectivity, drift or they are applicable to short muscle fascicles only. Addressing these issues, an algorithm was developed to analyse architectural parameters of the vastus lateralis muscle (VL)...
December 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29212914/distributed-force-feedback-in-the-spinal-cord-and-the-regulation-of-limb-mechanics
#9
T Richard Nichols
This review is an update on the role of force feedback from Golgi tendon organs in the regulation of limb mechanics during voluntary movement. Some current ideas about the role of force feedback are based on circuit motifs linking idealized systems of agonists, synergists and antagonistic muscles. Force feedback is widely distributed across the muscles of a limb and cannot be understood based on these circuit motifs. Muscle architecture similarly cannot be understood in terms of idealized systems. It is hypothesized that distributed force feedback better represents the complex mechanical interactions of muscles, including viscoelastic coupling and inertial coupling across joints and axes of rotation...
December 6, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29178622/revisiting-the-functional-anatomy-of-the-palmaris-longus-as-a-thenar-synergist
#10
Colin W Moore, Jacob Fanous, Charles L Rice
INTRODUCTION: Surgical studies describe the palmaris longus (PL) as a synergist in thumb abduction, which may facilitate its use in restoring thumb function using opponensplasty. However, beyond morphological descriptions and isometric thenar abduction strength measures, the evidence supporting the PL as a thenar synergist in-vivo is limited. The purpose here was to determine whether the PL provides synergistic contributions to thenar musculature by: (1) recording PL muscle activity using indwelling electromyography (EMG) during thumb movements; and (2) quantifying changes in PL muscle architecture using ultrasonography...
November 27, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/29168968/cross-sectional-comparison-of-age-related-changes-in-the-quadriceps-femoris-in-japanese-basketball-players
#11
Yuta Sekine, Norikazu Hirose
Background This study examines age-related changes in the quadriceps femoris (QF), subdivided into the vastus medialis oblique (VMO), vastus medialis (VM), rectus femoris (RF), vastus intermedius (VI) and vastus lateralis (VL) in basketball players. Subjects Seventy male basketball players were divided into four groups according to age (12-13, 14-15, 16-17, and 18-20 years). Methods Ultrasonography was used to measure muscle architecture of the VMO, VM, RF, VI and VL. We created cubic approximate expressions and calculated inflexion points to evaluate peak growth age of each muscle head...
November 23, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/29150270/m-biceps-femoris-a-wolf-in-sheep-s-clothing-the-downside-of-a-lower-limb-injury-prevention-training
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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