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Static stretching

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https://www.readbyqxmd.com/read/28094764/neuromorphic-meets-neuromechanics-part-ii-the-role-of-fusimotor-drive
#1
Kian Jalaleddini, Chuanxin Niu, Suraj Chakravarthi Raja, Won Joon Sohn, Gerald Loeb, Terence Sanger, Francisco Valero-Cuevas
OBJECTIVE: We studied the fundamentals of muscle afferentation by building a neuro-mechano-morphic system actuating a cadaveric finger. This system is a faithful implementation of the stretch reflex circuitry. It allowed the systematic exploration of the effects of different fusimotor drives to the muscle spindle on the closed-loop stretch reflex response. APPROACH: As in Part I of this work, sensory neurons conveyed proprioceptive information from muscle spindles (with static and dynamic fusimotor drive) to populations of ��-motor neurons (with recruitment and rate coding properties)...
January 17, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28088071/discrete-quasi-linear-viscoelastic-damping-analysis-of-connective-tissues-and-the-biomechanics-of-stretching
#2
Behzad Babaei, Aaron J Velasquez-Mao, Stavros Thomopoulos, Elliot L Elson, Steven D Abramowitch, Guy M Genin
The time- and frequency-dependent properties of connective tissue define their physiological function, but are notoriously difficult to characterize. Well-established tools such as linear viscoelasticity and the Fung quasi-linear viscoelastic (QLV) model impose forms on responses that can mask true tissue behavior. Here, we applied a more general discrete quasi-linear viscoelastic (DQLV) model to identify the static and dynamic time- and frequency-dependent behavior of rabbit medial collateral ligaments. Unlike the Fung QLV approach, the DQLV approach revealed that energy dissipation is elevated at a loading period of ∼10s...
December 22, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28051342/effects-of-thermal-agent-and-physical-activity-on-muscle-tendon-stiffness-and-effects-combined-with-static-stretching
#3
Kosuke Fujita, Masatoshi Nakamura, Hiroki Umegaki, Takuya Kobayashi, Satoru Nishishita, Hiroki Tanaka, Satoko Ibuki, Noriaki Ichihashi
CONTEXT: A recent review or article reported that thermal agents (TA) or physical activity (PA) can increase range of motion (ROM), and that the combination of TA with stretching is superior to performing stretching only. However, since ROM is affected by the participants' psychological factors, it is questionable whether these studies measured the effect of these intervention on muscle flexibility. By measuring muscle stiffness, we attempted to evaluate the effect these intervention on muscle flexibility...
January 4, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28047444/mo-fg-campus-jep3-02-a-novel-setup-approach-to-improve-c-spine-curvature-reproducibility-for-head-and-neck-radiotherapy-using-optical-surface-imaging-with-two-regions-of-interest
#4
K Ryan, M Gil, C Della Biancia, G Li
PURPOSE: To develop a novel approach to improve cervical spine (c-spine) curvature reproducibility for head and neck (HN) patients using optical surface imaging (OSI) with two regions of interests (ROIs). METHODS: The OSI-guided, two-step setup procedure requires two ROIs: ROI-1 of the shoulders and ROI-2 of the face. The neck can be stretched or squeezed in superior-inferior (SI) direction using a specially-designed sliding head support. We hypothesize that when these two ROIs are aligned, the c-spine should fall into a naturally reproducible position under same setup conditions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28036175/modeling-carbon-dioxide-vibrational-frequencies-in-ionic-liquids-i-ab-initio-calculations
#5
Eric J Berquist, Clyde A Daly, Thomas Brinzer, Krista K Bullard, Zachary M Campbell, Steven A Corcelli, Sean Garrett-Roe, Daniel S Lambrecht
This work elucidates the molecular binding mechanism of CO2 in [C4C1IM][PF6] ionic liquid (IL) and its interplay with the CO2 asymmetric stretch frequency ν3, and establishes computational protocols for the reliable construction of spectroscopic maps for simulating ultrafast 2D-IR data of CO2 solvated in ILs. While charge transfer drives the static frequency shift between different ionic liquids ( J. Chem. Phys. 2015 , 142 , 212425 ), we find here that electrostatic and Pauli repulsion effects dominate the dynamical frequency shift between different geometries sampled from the finite-temperature dynamics within a single ionic liquid...
December 30, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28013345/simulated-physiological-stretch-increases-expression-of-extracellular-matrix-proteins-in-human-bladder-smooth-muscle-cells-via-integrin-%C3%AE-4-%C3%AE-v-fak-erk1-2-signaling-pathway
#6
Shulian Chen, Chuandu Peng, Xin Wei, Deyi Luo, Yifei Lin, Tongxin Yang, Xi Jin, Lina Gong, Hong Li, Kunjie Wang
OBJECTIVES: To investigate the effect of simulated physiological stretch on the expression of extracellular matrix (ECM) proteins and the role of integrin α4/αv, focal adhesion kinase (FAK), extracellular regulated protein kinases 1/2 (ERK1/2) in the stretch-induced ECM protein expression of human bladder smooth muscle cells (HBSMCs). METHODS: HBSMCs were seeded onto silicone membrane and subjected to simulated physiological stretch at the range of 5, 10, and 15% elongation...
December 24, 2016: World Journal of Urology
https://www.readbyqxmd.com/read/27992070/exercise-for-haemophilia
#7
REVIEW
Karen Strike, Kathy Mulder, Rojer Michael
BACKGROUND: Haemophilia is a bleeding disorder associated with haemorrhaging into joints and muscles. Exercise is often used to aid recovery after bleeds, and to improve joint function in the presence of arthropathy. OBJECTIVES: Our objective was to systematically review the available evidence on the safety and effectiveness of exercise for people with haemophilia. SEARCH METHODS: We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Coagulopathies Trials Register and electronic databases PubMed, OVID-Embase, and CINAHL...
19, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27984497/acute-effects-of-the-different-intensity-of-static-stretching-on-flexibility-and-isometric-muscle-force
#8
Satoshi Kataura, Shigeyuki Suzuki, Shingo Matsuo, Genki Hatano, Masahiro Iwata, Kazuaki Yokoi, Wakako Tsuchida, Yasuhiro Banno, Yuji Asai
In various fields, static stretching is commonly performed to improve flexibility, whereas the acute effects of different stretch intensities are unclear. Therefore, we investigated the acute effects of different stretch intensities on flexibility and muscle force. Eighteen healthy participants (nine men, nine women) performed 180-s static stretches of the right hamstrings at 80%, 100%, and 120% of maximum tolerable intensity without stretching pain, in random order. The following outcomes were assessed as markers of lower limb function and flexibility: static passive torque (SPT), range of motion (ROM), passive joint (muscle-tendon) stiffness, passive torque at onset of pain (PT), and isometric muscle force...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27978463/spine-postural-change-elicits-localized-skin-structural-deformation-of-the-trunk-dorsum-in-vivo
#9
Shawn M Beaudette, Derek P Zwambag, Leah R Bent, Stephen H M Brown
As the most superficial organ, the skin is the most accessible sensory system interfacing one's body and environment. With changes in posture, it is possible that the skin may undergo large deformations resulting in changes in its structural properties. The purpose of the current work was to determine the influence of spine posture on measures of trunk dorsum skin deformation, thickness and hardness in vivo. 28 young and healthy individuals were assessed while holding three static, supported spine postures (prone neutral, spine extension, and spine flexion)...
December 1, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27966971/analysis-of-the-interfacial-molecular-behavior-of-a-lubrication-film-of-n-dodecane-containing-stearic-acid-under-lubricating-conditions-by-sum-frequency-generation-spectroscopy
#10
Seiya Watanabe, Miki Nakano, Koji Miyake, Shinya Sasaki
The molecular behavior of n-dodecane with added stearic acid at a friction interface was studied using sum frequency generation (SFG) spectroscopy and a tribometer. In the case of n-dodecane with stearic acid, under dynamic conditions, a strong peak from the symmetric stretching vibrational mode of methylene, which was not observed under static conditions, appears. However, this strong methylene peak was not observed in the case of only n-dodecane. The SFG spectrum in the C-H stretching mode region of n-dodecane-d26 with stearic acid in the dynamic condition was analogous to that in the static condition...
December 27, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27941488/no-differences-between-alter-g-trainer-and-active-and-passive-recovery-strategies-on-isokinetic-strength-systemic-oxidative-stress-and-perceived-muscle-soreness-after-exercise-induced-muscle-damage
#11
Matthew B Cooke, Carrie Nix, Lori Greenwood, Mike Greenwood
The incidence of muscle injuries is prevalent in elite sport athletes as well as weekend warriors and strategies that safely and effectively hasten recovery are highly desirable. The purpose of this study was to examine the differences between three recovery methods after eliciting muscle damage in recreationally active men relative to maximal isokinetic contractions, perceived muscle soreness and psychological mood states. Twenty-five recreationally active men (22.15±3.53yrs, 75.75±11.91kg, 180.52±7.3cm) were randomly matched by VO2 peak (53...
November 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27935646/postactivation-potentiation-can-counteract-declines-in-force-and-power-that-occur-after-stretching
#12
J Kümmel, A Kramer, N J Cronin, M Gruber
Stretching can decrease a muscle's maximal force, whereas short but intense muscle contractions can increase it. We hypothesized that when combined, postactivation potentiation induced by reactive jumps would counteract stretch-induced decrements in drop jump (DJ) performance. Moreover, we measured changes in muscle twitch forces and ankle joint stiffness (KAnkle ) to examine underlying mechanisms. Twenty subjects completed three DJs and 10 electrically evoked muscle twitches of the triceps surae subsequent to four different conditioning activities and control...
December 9, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27932408/early-responses-of-human-periodontal-ligament-fibroblasts-to-cyclic-and-static-mechanical-stretching
#13
Adamantia Papadopoulou, Anna Iliadi, Theodore Eliades, Dimitris Kletsas
OBJECTIVE: To compare the mechanotransduction caused by cyclic and static mechanical strains in human periodontal ligament fibroblasts (hPDLFs) cultured under identical conditions. MATERIALS AND METHODS: hPDLFs, originating from the same donors, were exposed either to cyclic or to static tensile strain using specially designed devices and under identical culture conditions. Activation of all members of mitogen-activated protein kinases (MAPKs) was monitored by western immunoblot analysis...
December 8, 2016: European Journal of Orthodontics
https://www.readbyqxmd.com/read/27901341/the-efficacy-and-characteristics-of-warm-up-and-re-warm-up-practices-in-soccer-players-a-systematic-review
#14
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
#15
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
#16
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
#17
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-metaboreflex-implications
#18
Massimo Venturelli, Emiliano Cè, Eloisa Limonta, Angela Valentina 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 metaboreflex, 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 10 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...
January 1, 2017: 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
#19
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
#20
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
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