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https://www.readbyqxmd.com/read/27901341/the-efficacy-and-characteristics-of-warm-up-and-re-warm-up-practices-in-soccer-players-a-systematic-review
#1
Amri Hammami, James Zois, Maamer Slimani, Mark Russel, Ezdine Bouhlel
INTRODUCTION: This review aimed (i) to evaluate the current research that examines the efficacy of warm-up (WU) and re-warm-up (RWU) on physical performance, and (ii) to highlight the WU and RWU characteristics that optimise subsequent performance in soccer players. EVIDENCE ACQUISITION: A computerized search was performed in the PubMed, ScienceDirect and Google Scholar (from 1995 to December 2015) for English-language, peer- reviewed investigations using the terms "soccer" OR "football" AND "warm-up" OR "stretching" OR "post-activation potentiation" OR "pre-activity" OR "re-warm-up" AND "performance" OR "jump" OR "sprint" OR "running"...
November 30, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27900185/benefits-of-a-novel-concept-of-home-based-exercise-with-the-aim-of-preventing-aspiration-pneumonia-and-falls-in-frail-older-women-a-pragmatic-controlled-trial
#2
Katsuhiko Takatori, Daisuke Matsumoto, Munenori Nishida, Shinnichiro Matsushita, Tatsuya Noda, Tomoaki Imamura
AIM: To investigate whether home-based exercise with the aim of preventing aspiration pneumonia and accidental falls improves swallowing-related and physical functions in community-dwelling frail older women. METHODS: Participants were 266 community-dwelling frail older women in a long-term care prevention class (mean (SD): age 75 (5) years). Participants were allocated to either an intervention group or a control group. In the intervention group, participants were asked to perform, at least three times a week for 6 months, a home-based exercise programme that was specifically developed to prevent aspiration pneumonia and accidental falls...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27895574/robot-assisted-rehabilitation-of-ankle-plantar-flexors-spasticity-a-3-month-study-with-proprioceptive-neuromuscular-facilitation
#3
Zhihao Zhou, Yao Sun, Ninghua Wang, Fan Gao, Kunlin Wei, Qining Wang
In this paper, we aim to investigate the effect of proprioceptive neuromuscular facilitation (PNF)-based rehabilitation for ankle plantar flexors spasticity by using a Robotic Ankle-foot Rehabilitation System (RARS). A modified robot-assisted system was proposed, and seven poststroke patients with hemiplegic spastic ankles participated in a 3-month robotic PNF training. Their impaired sides were used as the experimental group, while their unimpaired sides as the control group. A robotic intervention for the experimental group started from a 2-min passive stretching to warming-up or relaxing the soleus and gastrocnemius muscles and also ended with the same one...
2016: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/27890729/maturation-of-human-embryonic-stem-cell-derived-cardiomyocytes-hesc-cms-in-3d-collagen-matrix-effects-of-niche-cell-supplementation-and-mechanical-stimulation
#4
W Zhang, C W Kong, M H Tong, W H Chooi, N Huang, R A Li, B P Chan
: Cardiomyocytes derived from human embryonic stem cells (hESC-CMs) are regarded as a promising source for regenerative medicine, drug testing and disease modeling. Nevertheless, cardiomyocytes are immature in terms of their contractile structure, metabolism and electrophysiological properties. Here, we fabricate cardiac muscle strips by encapsulating hESC-CMs in collagen-based biomaterials. Supplementation of niche cells at 3% to the number of hESC-CMs enhance the maturation of the hESC-CMs in 3D tissue matrix...
November 24, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27856718/central-and-peripheral-responses-to-static-and-dynamic-stretch-of-skeletal-muscle-mechano-and-metabo-reflex-implications
#5
Massimo Venturelli, Emiliano Cé, Eloisa Limonta, Angela V Bisconti, Michela Devoto, Susanna Rampichini, Fabio Esposito
Passive static stretching (SS), circulatory cuff occlusion (CCO), and the combination of both (SS+CCO) have been used to investigate the mechano- and metabo-reflex, respectively. However, the effects of dynamic stretching (DS) alone or in combination with CCO (DS+CCO) on the same reflexes have never been explored. The aim of the study was to compare central and peripheral hemodynamic responses to DS, SS, DS+CCO, and SS+CCO. In ten participants, femoral blood flow (FBF), heart rate (HR), cardiac output (CO), and mean arterial pressure (MAP) were assessed during DS and SS of the quadriceps muscle with and without CCO...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27847714/effects-of-plantar-flexor-muscle-static-stretching-alone-and-combined-with-massage-on-postural-balance
#6
Ladan Hemmati, Zahra Rojhani-Shirazi, Samaneh Ebrahimi
OBJECTIVE: To evaluate and compare the effects of stretching and combined therapy (stretching and massage) on postural balance in people aged 50 to 65 years. METHODS: Twenty-three subjects participated in this nonrandomized clinical trial study. Each participant randomly received plantar flexor muscle stretching (3 cycles of 45 seconds with a 30-second recovery period between cycles) alone and in combination with deep stroking massage (an interval of at least 30 minutes separated the two interventions)...
October 2016: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27814860/comparison-between-static-stretching-and-the-pilates-method-on-the-flexibility-of-older-women
#7
Laís Campos de Oliveira, Raphael Gonçalves de Oliveira, Deise Aparecida de Almeida Pires-Oliveira
INTRODUCTION: Flexibility decreases with advancing age and some forms of exercise, such as static stretching and Pilates, can contribute to the improvement of this physical ability. OBJECTIVE: To compare the effects of static stretching and Pilates on the flexibility of healthy older women, over the age of 60 years. METHOD: Thirty-two volunteers were randomized into two groups (Static stretching or Pilates) to perform exercises for 60 min, twice a week, for three months...
October 2016: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/27806009/tapering-practices-of-croatian-open-class-powerlifting-champions
#8
Jozo Grgic, Pavle Mikulic
The aim of this study was to explore tapering practices among 10 Croatian open-class powerlifting champions (mean ± SD: age 29.2 ± 3.2 years; Wilks coefficient 355.1 ± 54.8). The athletes were interviewed about their tapering practices using a semi-structured interview, after which the audio content was transcribed. The athletes reported decreasing training volume during the taper by 50.5 ± 11.7% using a step type or an exponential type of taper with a fast decay. Training intensity was maintained or increased during the taper, and it reached its highest values 8 ± 3 days before the competition...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27792725/md-dpd-multiscale-framework-for-predicting-morphology-and-stresses-of-red-blood-cells-in-health-and-disease
#9
Hung-Yu Chang, Xuejin Li, He Li, George Em Karniadakis
Healthy red blood cells (RBCs) have remarkable deformability, squeezing through narrow capillaries as small as 3 microns in diameter without any damage. However, in many hematological disorders the spectrin network and lipid bilayer of diseased RBCs may be significantly altered, leading to impaired functionality including loss of deformability. We employ a two-component whole-cell multiscale model to quantify the biomechanical characteristics of the healthy and diseased RBCs, including Plasmodium falciparum-infected RBCs (Pf-RBCs) and defective RBCs in hereditary disorders, such as spherocytosis and elliptocytosis...
October 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27771331/dynamic-disorder-can-explain-non-exponential-kinetics-of-fast-protein-mechanical-unfolding
#10
Bogdan I Costescu, Sebastian Sturm, Frauke Gräter
Protein unfolding often does not obey a simple two-state behavior. Previous single molecule force spectroscopy studies demonstrated stretched exponential kinetics of protein unfolding under a constant pulling force, the molecular origin of which remains subject to debate. We here set out to extensively sample the mechanical unfolding of ubiquitin and NuG2 by Molecular Dynamics (MD) simulations. Both proteins show kinetics best fit by stretched exponentials, with stretching exponents similar to those found in experiments, even though static disorder is absent in our short MD simulations...
October 19, 2016: Journal of Structural Biology
https://www.readbyqxmd.com/read/27766127/effects-of-static-stretching-on-squat-performance-in-division-i-female-athletes
#11
Clare F Heisey, J Derek Kingsley
Static stretching was once recognized as a method of preparation for physical activity that would inhibit performance and increase risk of injury. However, a growing body of research suggests that static stretching may not have an inhibitory effect. Regardless, the data have not examined gender differences or the fatigue index (FI) and flexibility effects of static stretching on the back squat over multiple sets. Therefore, the purpose of this study was to examine the relationship between a static-stretch condition (SC) and control condition (CC) on flexibility and the FI of Division I female athletes during 4 sets of the back squat...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27759380/ab-initio-thermodynamic-and-thermophysical-properties-of-sodium-metasilicate-na2sio3-and-their-electron-density-and-electron-pair-density-counterparts
#12
Donato Belmonte, Carlo Gatti, Giulio Armando Ottonello, Pascal Richet, Marino Vetuschi Zuccolini
Thermodynamic and thermophysical properties of Na2SiO3 in the Cmc21 structural state are computed ab-initio using the hybrid B3LYP density functional method. The static properties at the athermal limit are first evaluated through a symmetry-preserving relaxation procedure. The thermodynamic properties that depend on vibrational frequencies viz, heat capacities, thermal expansion, thermal derivative of the bulk modulus, thermal correction to internal energy, enthalpy, Gibbs free energy, are then computed in the framework of quasi-harmonic approximation...
October 19, 2016: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27748039/low-level-stretching-accelerates-cell-migration-into-a-gap
#13
Samer Toume, Amit Gefen, Daphne Weihs
We observed that radially stretching cell monolayers at a low level (3%) increases the rate at which they migrate to close a gap formed by in vitro injury. Wound healing has been shown to accelerate in vivo when deformations are topically applied, for example, by negative pressure wound therapy. However, the direct effect of deformations on cell migration during gap closure is still unknown. Thus, we have evaluated the effect of radially applied, sustained (static) tensile strain on the kinematics of en mass cell migration...
October 17, 2016: International Wound Journal
https://www.readbyqxmd.com/read/27747368/cardiomyogenesis-of-periodontal-ligament-derived-stem-cells-by-dynamic-tensile-strain
#14
Daniel Pelaez, Zenith Acosta Torres, Tsz Kin Ng, Kwong Wai Choy, Chi Pui Pang, Herman S Cheung
Cellular therapies for the treatment of myocardial infarction have proven to be an invaluable tool in recent years and provide encouraging evidence for the possibility to restore normal heart function. However, questions still remain as to the optimal cell source, pre-conditioning methods and delivery techniques for such an application. This study explores the use of a population of stem cells arising from the neural crest and isolated from adult human periodontal ligament along with short-term mechanical strain as an inducer of cardiomyogenesis and possibly pre-conditioning stimulus for cellular cardiomyoplasty...
October 17, 2016: Cell and Tissue Research
https://www.readbyqxmd.com/read/27736289/acute-effects-of-foam-rolling-static-stretching-and-dynamic-stretching-during-warm-ups-on-muscular-flexibility-and-strength-in-young-adults
#15
Hsuan Su, Nai-Jen Chang, Wen-Lan Wu, Lan-Yuen Guo, I-Hua Chu
CONTEXT: Foam rolling has been proposed to improve muscle function, performance, and joint range of motion (ROM). However, whether a foam rolling protocol can be adopted as a warm-up to improve flexibility and muscle strength is unclear. OBJECTIVE: To examine and compare the acute effects of foam rolling, static stretching, and dynamic stretching used as part of warm-up on flexibility and muscle strength of knee flexion and extension. DESIGN: Crossover study...
October 13, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27722436/dielectric-elastomer-actuator-for-mechanical-loading-of-2d-cell-cultures
#16
Alexandre Poulin, Cansaran Saygili Demir, Samuel Rosset, Tatiana V Petrova, Herbert Shea
We demonstrate the use of dielectric elastomer actuators (DEAs) for mechanical stimulation of cells in vitro. The development of living tissues is regulated by their mechanical environment through the modification of fundamental cellular functions such as proliferation, differentiation and gene expression. Mechanical cues have been linked to numerous pathological conditions, and progress in cellular mechanobiology could lead to better diagnosis and treatments of diseases such as atherosclerosis and cancers...
September 21, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27714294/stretching-liquid-bridges-with-moving-contact-lines-comparison-of-liquid-transfer-predictions-and-experiments
#17
Chung-Hsuan Huang, Marcio S Carvalho, Satish Kumar
Transfer of liquid from one surface to another plays a key role in printing processes. During liquid transfer, a liquid bridge is formed and then undergoes significant extensional motion while its contact lines are free to move on the bounding solid surfaces. In this work, we develop one-dimensional (1D) slender-jet and two-dimensional (2D) axisymmetric models of this phenomenon and compare the resulting predictions with previously published experimental data. For very low capillary numbers (Ca) (quasi-static stretching), predictions from both models of the amount of liquid transferred agree well with the experimental data, provided that the difference in receding contact angles (|Δθr|) between the two surfaces is sufficiently large...
September 13, 2016: Soft Matter
https://www.readbyqxmd.com/read/27713663/edge-wrinkling-in-elastically-supported-pre-stressed-incompressible-isotropic-plates
#18
Michel Destrade, Yibin Fu, Andrea Nobili
The equations governing the appearance of flexural static perturbations at the edge of a semi-infinite thin elastic isotropic plate, subjected to a state of homogeneous bi-axial pre-stress, are derived and solved. The plate is incompressible and supported by a Winkler elastic foundation with, possibly, wavenumber dependence. Small perturbations superposed onto the homogeneous state of pre-stress, within the three-dimensional elasticity theory, are considered. A series expansion of the plate kinematics in the plate thickness provides a consistent expression for the second variation of the potential energy, whose minimization gives the plate governing equations...
September 2016: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27686453/adenosine-monophosphate-activated-protein-kinase-activation-and-suppression-of-inflammatory-response-by-cell-stretching-in-rabbit-synovial-fibroblasts
#19
Wanlop Kunanusornchai, Chatchai Muanprasat, Varanuj Chatsudthipong
Joint mobilization is known to be beneficial in osteoarthritis (OA) patients. This study aimed to investigate the effect of stretching on adenosine monophosphate-activated protein kinase (AMPK) activity and its role in modulating inflammation in rabbit synovial fibroblasts. Uniaxial stretching of isolated rabbit synovial fibroblasts for ten min was performed. Stretching-induced AMPK activation, its underlying mechanism, and its anti-inflammatory effect were investigated using Western blot. Static stretching at 20 % of initial length resulted in AMPK activation characterized by expression of phosphorylated AMPK and phosphorylated acetyl-Co A carboxylase...
September 30, 2016: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27676994/muscle-lengthening-and-structural-changes-in-the-muscle-tendon-complex-of-triceps-surae-after-1%C3%A2-year-of-rehabilitation-including-a-daily-self-stretch-program-in-patients-with-chronic-hemiparesis
#20
Maud Pradines, Ingrid Masson, Raphaël Portero, Caroline Giroux, Jean-Michel Gracies
OBJECTIVE: To explore changes in muscle architectural parameters of the muscle-tendon unit of soleus and medial gastrocnemius (GM) in patients with chronic hemiparesis, after 1 year of rehabilitation. MATERIAL/PATIENTS AND METHODS: In this prospective study, 20 chronic hemiparetic patients (8W, mean age: 56 [12], time since lesion 9 [8]) were evaluated. Muscle architectural parameters including muscle fascicle length, pennation angle, thickness, tendon and muscle belly lengths were evaluated in vivo using ultrasonography in passive condition (verified by electromyographic recording) in a seated patient with ankle, knee and hip on the paretic side at 90°...
September 2016: Annals of Physical and Rehabilitation Medicine
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