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"Muscle architecture"

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https://www.readbyqxmd.com/read/28488136/bilateral-differences-in-muscle-fascicle-architecture-are-not-related-to-the-preferred-leg-in-jumping-athletes
#1
Jeroen Aeles, Sietske Lenchant, Liesbeth Vanlommel, Benedicte Vanwanseele
PURPOSE: In many sports, athletes have a preferred leg for sport-specific tasks, such as jumping, which leads to strength differences between both legs, yet the underlying changes in force-generating mechanical properties of the muscle remain unknown. The purpose of this study was to investigate whether the muscle architecture of the medial gastrocnemius (MG) is different between both legs in well-trained jumping athletes and untrained individuals. In addition, we investigated the effect of two ankle joint positions on ultrasound muscle architecture measurements...
May 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28484857/muscle-architectural-properties-in-the-common-marmoset-callithrix-jacchus
#2
Naomichi Ogihara, Motoharu Oishi, Ryogo Kanai, Hikaru Shimada, Takahiro Kondo, Kimika Yoshino-Saito, Junichi Ushiba, Hideyuki Okano
The common marmoset, Callithrix jacchus, is a small New World monkey that has recently gained attention as an important experimental animal model in the field of neuroscience as well in rehabilitative and regenerative medicine. This attention reflects the closer phylogenetic relationship between humans and common marmosets compared to that between humans and other experimental animals. When studying the neuronal mechanism behind various types of neurological motor disorders using the common marmoset, possible differences in muscle parameters (e...
May 8, 2017: Primates; Journal of Primatology
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#3
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28443020/bgp-15-protects-against-oxaliplatin-induced-skeletal-myopathy-and-mitochondrial-reactive-oxygen-species-production-in-mice
#4
James C Sorensen, Aaron C Petersen, Cara A Timpani, Dean G Campelj, Jordan Cook, Adam J Trewin, Vanesa Stojanovska, Mathew Stewart, Alan Hayes, Emma Rybalka
Chemotherapy is a leading intervention against cancer. Albeit highly effective, chemotherapy has a multitude of deleterious side-effects including skeletal muscle wasting and fatigue, which considerably reduces patient quality of life and survivability. As such, a defense against chemotherapy-induced skeletal muscle dysfunction is required. Here we investigate the effects of oxaliplatin (OXA) treatment in mice on the skeletal muscle and mitochondria, and the capacity for the Poly ADP-ribose polymerase (PARP) inhibitor, BGP-15, to ameliorate any pathological side-effects induced by OXA...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28392769/force-depression-in-plantar-flexors-exists-equally-in-plantar-flexed-and-dorsiflexed-regions
#5
Atsuki Fukutani, Jun Misaki, Tadao Isaka
Isometric muscle force attained during isometric contractions decreases after active shortening compared to that attained during purely isometric contractions. This phenomenon is called residual force depression. The aim of this study was to examine whether residual force depression occurs in human plantar flexors in both plantar flexed and dorsiflexed region. In addition, the magnitude of fascicle shortening was evaluated because not only muscle force but also fascicle shortening during active shortening are considered to affect force depression...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28376674/effect-of-6-weeks-wbvt-on-the-behaviour-of-the-lower-limb-muscle-fibres-during-vertical-jumping
#6
Jacobo Ángel Rubio-Arias, Domingo Jesús Ramos-Campo, Paula Esteban, Fernando Martínez, José Fernando Jiménez
The purpose of the current study was to examine the effect of 6 weeks of whole body vibration training (WBVT) on body composition, muscle activity of the gastrocnemius and vastus lateralis, gastrocnemius muscle architecture (static and dynamic) and ground reaction forces (performance jump) during the take-off phase of a countermovement jump in young healthy adult males. A total of 33 men (23.31 ± 5.62 years) were randomly assigned to a whole body vibration group (experimental group, EGWBVT: n = 17; 22...
April 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28340204/changes-in-pain-and-muscle-architecture-in-colon-cancer-survivors-after-a-lumbopelvic-exercise-program-a-secondary-analysis-of-a-randomized-controlled-trial
#7
Irene Cantarero-Villanueva, Antonio I Cuesta-Vargas, Mario Lozano-Lozano, Carolina Fernández-Lao, Antonio Fernández-Pérez, Noelia Galiano-Castillo
Objective.:  To investigate the efficacy of an eight-week lumbopelvic stabilization program (CO-CUIDATE) for colon cancer survivors. Design.:  A secondary analysis of a randomized controlled clinical trial. Settings.:  A blinded, trained researcher performed the end point assessments for pain (Pressure Pain Threshold and Brief Pain Inventory) and muscle architecture (ultrasound imaging measurements). Subjects.:  Forty-six colon cancer survivors who were assigned to the CO-CUIDATE group or usual care group...
March 6, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28320672/spatial-analysis-of-multichannel-surface-emg-in-hemiplegic-stroke
#8
Ghulam Rasool, Babak Afsharipour, Nina Suresh, William Z Rymer
We investigated spatial activation patterns of upper extremity muscles during isometric force generation in both intact persons and in hemispheric stroke survivors. We used a 128-channel surface electromyogram (EMG) grid to record the electrical activity of biceps brachii muscles during these contractions. EMG data were processed to develop 2-dimensional root mean square (RMS) maps of muscle activity. Our objective was to determine whether motor impairments following stroke were associated with changes in the muscle activity maps and in the spatial distribution of muscular activation...
March 15, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28314091/changes-in-muscle-architecture-of-biceps-femoris-induced-by-eccentric-strength-training-with-nordic-hamstring-exercise
#9
D Alonso-Fernandez, P Docampo-Blanco, J Martinez-Fernandez
Eccentric strength training alters muscle architecture, but it is also an important factor for the prevention of hamstring injuries. The purpose was to determine the architectural adaptations of the biceps femoris long head (BFlh) after eccentric strength training with nordic hamstring exercise (NHE), followed by a subsequent detraining period. The participants in this intervention (n=23) completed a period of 13 weeks consisting of a first week of control and prior training, followed by 8 weeks of eccentric strength training with NHE, and concluding with a 4-week period of detraining...
March 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28280975/the-effect-of-nordic-hamstring-strength-training-on-muscle-architecture-stiffness-and-strength
#10
Kayla D Seymore, Zachary J Domire, Paul DeVita, Patrick M Rider, Anthony S Kulas
PURPOSE: Hamstring strain injury is a frequent and serious injury in competitive and recreational sports. While Nordic hamstring (NH) eccentric strength training is an effective hamstring injury-prevention method, the protective mechanism of this exercise is not understood. Strength training increases muscle strength, but also alters muscle architecture and stiffness; all three factors may be associated with reducing muscle injuries. The purpose of this study was to examine the effects of NH eccentric strength training on hamstring muscle architecture, stiffness, and strength...
May 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28269625/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#11
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267010/regenerating-the-anal-sphincter-cytokines-stem-cells-or-both
#12
Li Sun, Zhuojun Xie, Mei Kuang, Marc Penn, Margot S Damaser, Massarat Zutshi
BACKGROUND: Healing of an anal sphincter defect at a time distant from injury is a challenge. OBJECTIVE: We aimed to investigate whether re-establishing stem cell homing at the site of an anal sphincter defect when cytokine expression has declined using a plasmid engineered to express stromal derived factor 1 with or without mesenchymal stem cells can improve anatomic and functional outcome. DESIGN: This was a randomized animal study. SETTINGS: Thirty-two female age- and weight-matched Sprague Dawley rats underwent 50% excision of the anal sphincter complex...
April 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/28264545/innervation-zone-targeted-botulinum-toxin-injections
#13
Bayram Kaymak, Murat Kara, Arzu Yağiz-On, Abdullah R Soylu, Levent Özçakar
Muscle overactivity (spasticity, dystonia or spasm) seen in certain neuromuscular disorders has been effectively treated with intramuscular injection of botulinum neurotoxins (BoTXs). Since they act in the nerve terminals, the toxin must be transported to the neuromuscular junctions which are generally clustered in one or more restricted areas (innervations zone(s)) in a skeletal muscle. The innervation zone targeted BoTX injections using guidance is highly recommended to achieve an optimal therapeutic goal with lower doses and fewer side effects...
March 6, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28229237/different-recoveries-of-the-first-and-second-phases-of-the-m-wave-after-intermittent-maximal-voluntary-contractions
#14
Javier Rodriguez-Falces, Nicolas Place
PURPOSE: We investigated the recovery of muscle electrical properties after intermittent intense exercise by examining separately the first and second phases of the muscle compound action potential (M-wave). METHODS: M-waves and mechanical twitches were obtained using femoral nerve stimulation throughout the 30-min recovery period following 48 successive intermittent 3-s MVCs. The amplitude, duration, and area of the M-wave first and second phases, and the peak twitch force were measured from the knee extensors...
February 22, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28227883/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#15
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Masami Iwamoto, Yuko Nakahira
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28211795/a-murine-model-of-a-novel-surgical-architecture-for-proprioceptive-muscle-feedback-and-its-potential-application-to-control-of-advanced-limb-prostheses
#16
Tyler R Clites, Matthew J Carty, Shriya Srinivasan, Anthony N Zorzos, Hugh M Herr
OBJECTIVE: Proprioceptive mechanisms play a critical role in both reflexive and volitional lower extremity control. Significant strides have been made in the development of bionic limbs that are capable of bi-directional communication with the peripheral nervous system, but none of these systems have been capable of providing physiologically-relevant muscle-based proprioceptive feedback through natural neural pathways. In this study, we present the agonist-antagonist myoneural interface (AMI), a surgical approach with the capacity to provide graded kinesthetic feedback from a prosthesis through mechanical activation of native mechanoreceptors within residual agonist-antagonist muscle pairs...
February 17, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28198659/intra-and-inter-rater-reliabilities-of-measurement-of-ultrasound-imaging-for-muscle-thickness-and-pennation-angle-of-tibialis-anterior-muscle-in-stroke-patients
#17
Ki Hun Cho, Hwang Jae Lee, Wan Hee Lee
BACKGROUND: Dysfunction of skeletal muscle has been commonly reported in stroke patients. OBJECTIVE: The purpose of this study was to investigate the intra- and inter-rater reliabilities of measurement of ultrasound imaging (USI) for pennation angle (PA) and muscle thickness (MT) of tibialis anterior muscle in stroke patients. METHODS: Thirty-four stroke patients (19 men) participated in this study. USI was used for measurement of PA and MT of the tibialis anterior muscles at rest and during maximum voluntary contraction (MVC)...
February 15, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28166121/neural-and-muscular-contributions-to-the-age-related-reductions-in-rapid-strength
#18
Gena R Gerstner, Brennan J Thompson, Joseph G Rosenberg, Eric J Sobolewski, Michael J Scharville, Eric D Ryan
INTRODUCTION: The purpose of this study was to investigate the age-related differences in absolute and normalized plantarflexion rate of torque development (RTD) at early (0-50 ms) and late (100-200 ms) time intervals, and to examine specific neural and muscular mechanisms contributing to these differences. METHODS: Thirty-two young (20.0±2.1 yrs) and 20 older (69.5±3.3 yrs) recreationally active men performed rapid plantarflexion isometric muscle actions to examine absolute and normalized RTD and muscle activation using electromyography (EMG) at early and late time intervals...
February 4, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28161870/acute-effect-of-static-stretching-on-passive-stiffness-of-the-human-gastrocnemius-fascicle-measured-by-ultrasound-shear-wave-elastography
#19
Kosuke Hirata, Hiroaki Kanehisa, Naokazu Miyamoto
PURPOSE: Passive muscle stiffness and muscle architecture at a given joint angle, as well as slack angle of the muscle have been shown to change after an acute bout of stretching. However, it remains unclear whether passive muscle stiffness at a given fascicle length is reduced after stretching. We aimed to elucidate the acute effect of static stretching on the passive fascicle stiffness using ultrasound shear wave elastography. METHODS: Shear modulus, fascicle length, and slack angle of the medial gastrocnemius (MG) as well as passive plantar flexion torque during passive dorsiflexion were measured before and after a 5-min static stretching in 14 healthy males...
March 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28160082/periodization-effects-during-short-term-resistance-training-with-equated-exercise-variables-in-females
#20
Thiemo Pelzer, Boris Ullrich, Mark Pfeiffer
PURPOSE: During resistance training, volume and load can be altered either gradually (traditional periodization: TP) or with frequent changes between subsequent sessions (daily undulating periodization: DUP). We hypothesized that the periodization model employed would not impact upon training-induced adaptations when exercise variables are equated. METHODS: Nineteen females (22.0 years, moderate resistance training experience of 27.9 months) performed 6 weeks of knee extensor training with 3 weekly sessions exercising one leg using TP and the contralateral leg using DUP...
March 2017: European Journal of Applied Physiology
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