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https://www.readbyqxmd.com/read/29150297/prolonged-stretching-of-the-ankle-plantarflexors-elicits-muscle-tendon-adaptations-relevant-to-ankle-gait-kinetics-in-children-with-spastic-cerebral-palsy
#1
Teresa Martín Lorenzo, Eduardo Rocon, Ignacio Martínez Caballero, Ana Ramírez Barragán, Sergio Lerma Lara
Tissue related ankle hyper-resistance has been reported to contribute to equinus gait in children with spastic cerebral palsy. Hence, ankle plantarflexor stretching programs have been developed in order to restore passive ankle dorsiflexion. Despite high quality evidence on the limited effects of stretching on passive joint mobility, further muscle-tendon adaptations have been reported which may impact gait performance. As such, children with spastic cerebral palsy subject to long-term manual static stretching achieved dorsiflexion gains through the reduction of muscle and fascicle strain whilst preserving tendon strain, and prolonged use of ankle-foot orthoses achieved similar dorsiflexion gains through increased tendon strain whilst preserving muscle and fascicle strain...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29143172/identification-of-key-genes-and-construction-of-microrna-mrna-regulatory-networks-in-bladder-smooth-muscle-cell-response-to-mechanical-stimuli-using-microarray-expression-profiles-and-bioinformatics-analysis
#2
Liao Peng, De-Yi Luo
PURPOSE: To identify keys genes and elucidate miRNA-mRNA regulatory networks in Bladder smooth muscle cell (BSMC) response to mechanical stimuli. METHODS: Human BSMCs, seeded on a silicone membrane, were subjected to mechanical stretch or without stretch. Microarray was used to analyze the differential expression of mRNAs and miRNAs between human BSMCs under mechanical stretch and control static control group. Differentially expressed genes(DEGs) and miRNAs (DEMs) in these two groups were identified...
November 15, 2017: World Journal of Urology
https://www.readbyqxmd.com/read/29120006/manufactured-brace-modalities-for-elbow-stiffness
#3
Nipun Sodhi, Anton Khlopas, Michael D Vaughn, Jaiben George, George Yakubek, Assem A Sultan, Steven F Harwin, Michael A Mont
Multiple surgical and nonsurgical treatment options exist for patients with elbow stiffness. Many nonsurgical mobilization bracing options have been implemented to increase elbow range of motion. Three of the main bracing options for these patients are turnbuckle, static progressive stretch, and dynamic bracing. The purpose of this study was to review the current literature on turnbuckle, static progressive stretch, and dynamic bracing to provide information for practitioners and patients regarding which brace is more appropriate to use for elbow stiffness...
November 8, 2017: Orthopedics
https://www.readbyqxmd.com/read/29114534/immediate-effect-of-passive-static-stretching-versus-resistance-exercises-on-postprandial-blood-sugar-levels-in-type-2-diabetes-mellitus-a-randomized-clinical-trial
#4
Peeyoosha Gurudut, Abey P Rajan
The prevalence of diabetes is rapidly rising all over the globe at an alarming rate. In India, more than 61.3 million people have been presently diagnosed with type 2 diabetes mellitus. It is possible to control the circulating blood glucose levels by reducing life style risk factors through physical activities comprising of muscle stretches, aerobic training, resistance exercises (REs), yoga, etc. The aim of this study is to identify and compare the immediate effect of passive static stretching (PSS) versus RE on blood glucose level in individuals with type 2 diabetes mellitus...
October 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29107003/elevated-wall-tension-initiates-interleukin-6-expression-and-abdominal-aortic-dilation
#5
Adam W Akerman, Robert E Stroud, Ryan W Barrs, R Tyler Grespin, Lindsay T McDonald, R Amanda C LaRue, Rupak Mukherjee, John S Ikonomidis, Jeffery A Jones, Jean Marie Ruddy
INTRODUCTION: Hypertension (HTN) has long been associated with abdominal aortic aneurysm (AAA) development and these cardiovascular pathologies are biochemically characterized by elevated plasma levels of Angiotensin-II (AngII) as well as interleukin-6 (IL-6). A biologic relationship between HTN and AAA has not been established, however. Accordingly, the objective of this study was to evaluate whether elevated tension may initiate IL-6 production to accumulate monocyte/macrophages and promote dilation of the abdominal aorta (AA)...
October 26, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29072027/effect-of-stretching-based-rehabilitation-on-pain-flexibility-and-muscle-strength-in-dancers-with-hamstring-injury-a-single-blind-prospective-randomized-clinical-trial
#6
Giwon Kim, Hyangsun Kim, Woo K Kim, Junesun Kim
BACKGROUND: Hamstring injuries commonly occur in mainstream sports and occupations that involve physical activity. We evaluated the effect of a stretching-based rehabilitation program on pain, flexibility, and strength in dancers with hamstring injuries. METHODS: Sixteen Korean traditional dancers with unilateral hamstring injuries were included and randomly assigned to a rehabilitation or control group. The rehabilitation group received stretching-based rehabilitation for 8 weeks, which comprised simple static stretches and basic range of motion (ROM) exercises, such as static and active stretching, concentric and eccentric ROM training, and trunk stabilization exercises...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29063454/acute-effects-of-dynamic-stretching-on-muscle-flexibility-and-performance-an-analysis-of-the-current-literature
#7
REVIEW
Jules Opplert, Nicolas Babault
Stretching has long been used in many physical activities to increase range of motion (ROM) around a joint. Stretching also has other acute effects on the neuromuscular system. For instance, significant reductions in maximal voluntary strength, muscle power or evoked contractile properties have been recorded immediately after a single bout of static stretching, raising interest in other stretching modalities. Thus, the effects of dynamic stretching on subsequent muscular performance have been questioned. This review aimed to investigate performance and physiological alterations following dynamic stretching...
October 23, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29049892/velocity-of-the-muscle-tendon-unit-is-sex-dependent-and-not-altered-with-acute-static-stretch
#8
Carey L Simpson, Rowan R Smart, Dylan Ee Melady, Jennifer M Jakobi
Contraction velocity of a muscle tendon unit (MTU) is dependent upon the interrelationship between fascicles shortening and the tendon lengthening. Altering the mechanical properties of these tissues through a perturbation such as static stretching slows force generation. Females, who have inherently greater compliance compared with males have slower velocity of MTU components. The addition of a static stretch might further exacerbate this sex difference. The purpose of this study was to investigate the velocity of fascicle shortening and tendon lengthening in males and females during isometric maximal voluntary contraction (MVC) of the plantar flexors prior to and following an acute static stretch...
October 19, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29047794/optical-sensor-system-for-time-resolved-quantification-of-methane-densities-in-ch4-fueled-spark-ignition-engines
#9
Kai Golibrzuch, Finn-Erik Digulla, Stephan Bauke, Hainer Wackerbarth, Olaf Thiele, Thomas Berg
We present the development and the first application of an optical sensor system that allows single-cycle determination of methane (CH4) concentration inside internal combustion (IC) engines. We use non-dispersive infrared absorption spectroscopy to detect the CH4 density with a time resolution up to 33 μs at acquisition rates of 30 kHz. The measurement scheme takes advantage of the strong temperature dependence of the absorption band applying two detection channels for CH4 that detect different spectral regions of the ν3 anti-symmetric C-H-stretch absorption...
August 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29037633/pilates-increases-the-isokinetic-muscular-strength-of-the-knee-extensors-and-flexors-in-elderly-women
#10
Laís Campos Oliveira, Raphael Gonçalves Oliveira, Deise Aparecida de Almeida Pires-Oliveira
INTRODUCTION: Pilates has been shown to be effective for increasing muscle strength in older adults, however, some variables have not yet been explored. OBJECTIVE: Investigate the effects of Pilates on the isokinetic muscular strength of the knee extensors and flexors at 60°/s, in elderly women. METHOD: Thirty-two women were randomized into two groups: control group (CG, n = 16, age = 64.2 ± 0.8 years; BMI = 25.0 ± 1.2 kg/m(2)), and experimental group (EG, n = 16, age = 63...
October 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29037360/factors-influencing-peripheral-venous-pressure-in-an-experimental-model
#11
Seshadri Raju, William Crim, William Buck
BACKGROUND: Peripheral venous hypertension and microvascular injury have merged as central features of chronic venous disease. Peripheral venous pressure in the lower limb is controlled by central and peripheral mechanisms. In the current manuscript, we examine the role of peripheral factors, particularly conduit capacitance compliance, focal stenosis, and arterial inflow into the calf. METHODS: An experimental venous model using Penrose tubing as a venous analogue was used where the aforementioned parameters could be manipulated...
November 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/29037040/highly-flexible-and-sensitive-wearable-e-skin-based-on-graphite-nanoplatelet-and-polyurethane-nanocomposite-films-in-mass-industry-production-available
#12
Jianfeng Wu, Huatao Wang, Zhiwei Su, Minghao Zhang, Xiaodong Hu, Yijie Wang, Ziao Wang, Bo Zhong, Weiwei Zhou, Junpeng Liu, Scott Guozhong Xing
Graphene and nanomaterials based flexible pressure sensors R&D activities are becoming hot topics due to the huge marketing demand on wearable devices and electronic skin (E-Skin) to monitor the human body's actions for dedicated healthcare. Herein, we report a facile and efficient fabrication strategy to construct a new type of highly flexible and sensitive wearable E-Skin based on graphite nanoplates (GNP) and polyurethane (PU) nanocomposite films. The developed GNP/PU E-Skin sensors are highly flexible with good electrical conductivity due to their unique binary microstructures with synergistic interfacial characteristics, which are sensitive to both static and dynamic pressure variation, and can even accurately and quickly detect the pressure as low as 0...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29023731/physiological-tremor-increases-when-skeletal-muscle-is-shortened-implications-for-fusimotor-control
#13
Kian Jalaleddini, Akira Nagamori, Christopher M Laine, Mahsa A Golkar, Robert E Kearney, Francisco J Valero-Cuevas
KEY POINTS: In tonic, isometric, plantarflexion contractions, physiological tremor increases as the ankle joint becomes plantarflexed. Modulation of physiological tremor as a function of muscle stretch differs from that of the stretch reflex amplitude. Amplitude of physiological tremor may be altered as a function of reflex pathway gains. Healthy humans likely increase their γ-static fusimotor drive when muscles shorten. Quantification of physiological tremor by manipulation of joint angle may be a useful experimental probe of afferent gains and/or the integrity of automatic fusimotor control...
October 11, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29023326/combined-effects-of-static-stretching-and-electrical-stimulation-on-joint-range-of-motion-and-muscle-strength
#14
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/28988152/acute-effects-of-static-stretching-on-the-shear-elastic-moduli-of-the-medial-and-lateral-gastrocnemius-muscles-in-young-and-elderly-women
#15
Masatoshi Nakamura, Tome Ikezoe, Satoru Nishishita, Jun Umehara, Misaka Kimura, Noriaki Ichihashi
PURPOSE: Generally, static stretching (SS) is the recommended intervention for a decline in the range of motion among elderly adults. However, no study has investigated the acute effects of SS on the shear elastic modulus in elderly people. The aims of the present study were to investigate the acute effects of SS on the shear elastic moduli of the medial and lateral gastrocnemius muscles and to examine the differences in these acute effects between young and elderly women. METHODS: This study included 15 healthy young women (age: 23...
September 25, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28985697/characterization-of-prepractice-injury-prevention-exercises-of-high-school-athletic-teams
#16
James R Slauterbeck, Autumn Reilly, Pamela M Vacek, Rebecca Choquette, Timothy W Tourville, Bert Mandelbaum, Robert J Johnson, Bruce D Beynnon
BACKGROUND: Static and dynamic exercises are performed before activity to decrease injury risk and increase performance. Although evidence supports using dynamic over static stretching and performing Fédération Internationale de Football Association (FIFA) 11+ as a dynamic prepractice routine, we do not know the frequency at which these exercises are utilized in high school populations. HYPOTHESIS: We hypothesize that there is a wide variety of preparticipation exercises performed by high school athletes, and that few high school teams perform FIFA 11+ as an injury prevention program in its entirety...
November 2017: Sports Health
https://www.readbyqxmd.com/read/28984769/conservative-treatment-for-equinus-deformity-in-children-with-cerebral-palsy-using-an-adjustable-splint-assisted-ankle-foot-orthosis
#17
Wei Chen, Xiaoyu Liu, Fang Pu, Yang Yang, Lizhen Wang, Hong Liu, Yubo Fan
BACKGROUND: A novel splint, the assisting ankle-foot orthoses (AFO), was developed to provide adjustable sustained stretching to improve conservative treatment for equinus deformities in children with cerebral palsy (CP). The treatment effect was validated by follow-up visits. METHODS: This study involved subjects between 2 and 12 years old, including 28 CP children treated with splint-assisted AFO correction, 30 CP children treated with static AFO correction, and 30 normal children with typical development (TD)...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28975133/pectoralis-minor-contracture-in-throwing-shoulders-of-asymptomatic-adolescent-baseball-players
#18
Justin L Hodgins, William Rubenstein, David Kovacevic, Ajay Padaki, Charles M Jobin, Christopher S Ahmad
BACKGROUND: Although scapular malpositioning is commonly associated with rotational deficits and risk of injury, modifiable causes of such malpositioning in overhead athletes are not well described. PURPOSE/HYPOTHESIS: The purpose of this study was to examine the scapulothoracic profile of adolescent baseball players, specifically, pectoralis minor (PM) length. We hypothesized that PM would be shorter in throwing shoulders compared with nonthrowing shoulders. STUDY DESIGN: Cross-sectional study; Level of evidence, 3...
September 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28968385/a-continuum-mechanical-skeletal-muscle-model-including-actin-titin-interaction-predicts-stable-contractions-on-the-descending-limb-of-the-force-length-relation
#19
Thomas Heidlauf, Thomas Klotz, Christian Rode, Tobias Siebert, Oliver Röhrle
Contractions on the descending limb of the total (active + passive) muscle force-length relationship (i. e. when muscle stiffness is negative) are expected to lead to vast half-sarcomere-length inhomogeneities. This is however not observed in experiments-vast half-sarcomere-length inhomogeneities can be absent in myofibrils contracting in this range, and initial inhomogeneities can even decrease. Here we show that the absence of half-sarcomere-length inhomogeneities can be predicted when considering interactions of the semi-active protein titin with the actin filaments...
October 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28960525/a-solution-processable-omnidirectionally-stretchable-and-high-pressure-sensitive-piezoresistive-device
#20
Eun Roh, Han-Byeol Lee, Do-Il Kim, Nae-Eung Lee
The development of omnidirectionally stretchable pressure sensors with high performance without stretching-induced interference has been hampered by many challenges. Herein, an omnidirectionally stretchable piezoresistive pressure-sensing device is demonstrated by combining an omniaxially stretchable substrate with a 3D micropattern array and solution-printing of electrode and piezoresistive materials. A unique substrate structural design and materials mean that devices that are highly sensitive are rendered, with a stable out-of-plane pressure response to both static (sensitivity of 0...
September 27, 2017: Advanced Materials
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