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https://www.readbyqxmd.com/read/28724548/bradykinin-does-not-acutely-sensitize-the-reflex-pressor-response-during-hindlimb-skeletal-muscle-stretch-in-decerebrate-rats
#1
Korynne S Rollins, Joshua R Smith, Peter J Esau, Evan A Kempf, Tyler D Hopkins, Steven W Copp
Hindlimb skeletal muscle stretch (i.e., selective activation of the muscle mechanoreflex) in decerebrate rats evokes reflex increases in blood pressure and sympathetic nerve activity. Bradykinin has been found to sensitize mechano-gated channels through a bradykinin B2 receptor-dependent mechanism. Moreover, bradykinin B2 receptor expression on sensory neurons is increased following chronic femoral artery ligation in the rat (a model of simulated peripheral artery disease). We tested the hypothesis that, in decerebrate, unanesthetized rats, the injection of bradykinin into the arterial supply of a hindlimb would acutely augment (i...
July 19, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28723790/relationship-of-medial-gastrocnemius-relative-fascicle-excursion-and-ankle-joint-power-and-work-performance-during-gait-in-typically-developing-children-a-cross-sectional-study
#2
Teresa Martín Lorenzo, Gustavo Albi Rodríguez, Eduardo Rocon, Ignacio Martínez Caballero, Sergio Lerma Lara
Muscle fascicles lengthen in response to chronic passive stretch through in-series sarcomere addition in order to maintain an optimum sarcomere length. In turn, the muscles' force generating capacity, maximum excursion, and contraction velocity is enhanced. Thus, longer fascicles suggest a greater capacity to develop joint power and work. However, static fascicle length measurements may not be taking sarcomere length differences into account. Thus, we considered relative fascicle excursions through passive ankle dorsiflexion may better correlate with the capacity to generate joint power and work than fascicle length...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28717616/topical-polidocanol-application-in-combination-with-static-stretching-in-tendinopathies-a-prospective-pilot-study
#3
Matthias Gatz, Simone Schrading, Timm Dirrichs, Marcel Betsch, Markus Tingart, Björn Rath, Christiane Kuhl, Valentin Quack
BACKGROUND: Highly operator-based injection therapy with vasosclerosing and anesthetic polidocanol is used for tendinopathies. This pilot-study evaluates the topical application of polidocanol gel. METHODS: Prospective case series. 39 patients with tendinopathies (14 Achilles, 14 patella, 11 wrist extensors) with a symptom duration > 6 months were included. Polidocanol and static stretching were the therapy in the first 2 weeks, while static stretching was continuously performed for 6 months...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28714771/acute-effect-of-static-stretching-on-lower-limb-movement-performance-by-using-stabl-virtual-reality-system
#4
Mariam A Ameer, Qassim I Muaidi
CONTEXT: The effect of acute static stretch (ASS) on the lower limb RT has been recently questioned to decrease the risk of falling and injuries in situations requiring a rapid reaction, as in the cases of balance disturbance. OBJECTIVE: The main purpose of this study was to detect the effect of ASS on the lower limb RT by using virtual reality device. DESIGN: Two Group Control Group design. SETTING: Research laboratory...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28684232/acute-effect-and-time-course-of-extension-and-internal-rotation-stretching-of-the-shoulder-on-infraspinatus-muscle-hardness
#5
Ken Kusano, Satoru Nishishita, Masatoshi Nakamura, Hiroki Tanaka, Jun Umehara, Noriaki Ichihashi
BACKGROUND: A decrease in flexibility of the infraspinatus muscle causes limitations in the range of shoulder motion. Static stretching (SS) is a useful method to improve muscle flexibility and joint mobility. Previous researchers investigated effective stretching methods for the infraspinatus. However, few researchers investigated the acute effect of SS on the infraspinatus muscle's flexibility. In addition, the minimum SS time required to increase the infraspinatus muscle's flexibility remains unclear...
July 3, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28668298/interstitial-fluid-flow-induced-growth-potential-and-hyaluronan-synthesis-of-fibroblasts-in-a-fibroblast-populated-stretched-collagen-gel-culture
#6
Natsumi Saito, Hiroaki Adachi, Hiroshi Tanaka, Satoru Nakata, Norifumi Kawada, Ken Oofusa, Katsutoshi Yoshizato
BACKGROUND: Tensioned collagen gels with dermal fibroblasts (DFs) as a dermis model are usually utilized in a static culture (SC) that lacks medium flowing. To make the model closer to its in vivo state, we created a device to perfuse the model with media flowing at a physiological velocity and examined the effects of medium flow (MF) on the cultures. METHODS: We constructed a medium perfusion device for human DF-embedded stretched collagen gels (human dermis model), exposed the model to media that flows upwardly at ~1mL/day, and examined water retention of the gels, cells' growth ability, metabolic activity, expression profiles of nine extracellular matrix (ECM)-related genes...
June 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28630574/unilateral-rolling-of-the-foot-did-not-affect-non-local-range-of-motion-or-balance
#7
Lena Grabow, James D Young, Jeannette M Byrne, Urs Granacher, David G Behm
Non-local or crossover (contralateral and non-stretched muscles) increases in range-of-motion (ROM) and balance have been reported following rolling of quadriceps, hamstrings and plantar flexors. Since there is limited information regarding plantar sole (foot) rolling effects, the objectives of this study were to determine if unilateral foot rolling would affect ipsilateral and contralateral measures of ROM and balance in young healthy adults. A randomized within-subject design was used to examine non-local effects of unilateral foot rolling on ipsilateral and contralateral limb ankle dorsiflexion ROM and a modified sit-and-reach-test (SRT)...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28626322/the-effect-of-age-on-hamstring-passive-properties-after-a-10-week-stretch-training
#8
Thomas Haab, Georg Wydra
[Purpose] Degenerative changes take place in the musculoskeletal system of elderly people, resulting in a reduced range of motion. For this reason, stretch training is recommended for elderly individuals. To date, there have been no studies of the adaptations of the passive properties of muscles following long-term stretch training. The aim of this study is to investigate the hamstring elasticity of elderly people following a 10-week stretch training and compare the results to a younger cohort. [Subjects and Methods] The experimental groups consisted of 15 younger (24...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28625710/effect-of-an-individualised-physical-exercise-program-on-lipid-profile-in-sedentary-patients-with-cardiovascular-risk-factors
#9
Francisco Javier Rubio Pérez, Luis Franco Bonafonte, Daiana Ibarretxe Guerediaga, Maria Pilar Oyon Belaza, Paola Ugarte Peyron
Physical exercise has become in an important tool in the reduction of cardiovascular risk. OBJECTIVES: To evaluate the effectiveness of an unsupervised physical exercise program that on the physical condition and the lipid profile. METHOD: The final sample included 49 sedentary men and women, who were non-smokers, with dyslipidaemia, overweight, and type1 obesity. The 4-month program included walking for 30-60minutes every day, and for three days a week, 30minutes of cycling at an intensity of 40-60% of maximum functional capacity, as well as isometric abdominals and static stretching...
June 15, 2017: Clínica e Investigación en Arteriosclerosis
https://www.readbyqxmd.com/read/28624851/acute-effects-of-constant-torque-and-constant-angle-stretching-on-the-muscle-and-tendon-tissue-properties
#10
Andreas Konrad, Francesco Budini, Markus Tilp
PURPOSE: Static stretching induces acute structural changes of the muscle-tendon unit (MTU) that are related to the intensity or duration of stretching. It has been reported that stretching with a constant torque (CT) leads to greater joint range of motion changes than stretching with a constant angle (CA). Whether or not this difference is due to different structural changes of the MTUs of the lower leg and ankle plantar flexors is not known. Therefore, the purpose of this study was to compare the acute effects of single CA and CT stretching on various muscle and tendon mechanical properties...
August 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28607322/assessment-of-the-mechanical-properties-of-the-muscle-tendon-unit-by-supersonic-shear-wave-imaging-elastography-a-review
#11
Kelly Mônica Marinho E Lima, José Francisco Silva Costa Júnior, Wagner Coelho de Albuquerque Pereira, Liliam Fernandes de Oliveira
This review aimed to describe the state of the art in muscle-tendon unit (MTU) assessment by supersonic shear wave imaging (SSI) elastography in states of muscle contraction and stretching, during aging, and in response to injury and therapeutic interventions. A consensus exists that MTU elasticity increases during passive stretching or contraction, and decreases after static stretching, electrostimulation, massage, and dry needling. There is currently no agreement regarding changes in the MTU due to aging and injury...
April 15, 2017: Ultrasonography
https://www.readbyqxmd.com/read/28593083/dynamic-oscillatory-stretching-efficacy-on-hamstring-extensibility-and-stretch-tolerance-a-randomized-controlled-trial
#12
Arie Michaeli, Jason Cameron Tee, Aimee Stewart
BACKGROUND: While static stretch (SS), proprioceptive neuromuscular facilitation (PNF) and oscillatory physiological mobilization techniques are documented to have positive effects on a range of motion (ROM), there are no reports on the effect of dynamic oscillatory stretching (DOS), a technique that combines these three techniques, on hamstring extensibility. PURPOSE: To determine whether DOS improves hamstring extensibility and stretch tolerance to a greater degree than SS in asymptomatic young participants...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28585766/one-minute-plantar-flexors-static-stretch-transiently-increases-h-reflex-excitability-and-exerts-no-effect-on-corticospinal-pathways
#13
Francesco Budini, Eugen Gallasch, Monica Christova, Dietmar Rafolt, Andreas Benedikt Rauscher, Tilp Markus
The purpose of this study was to determine whether the neural responses observed following static stretching are mediated by muscle spindles sensitivity, spinal excitability or cortical excitability and how long these influences last. Nineteen volunteers (25.7 ± 5.6 years) were tested for tap reflex (T-reflex), H-reflex and motor evoked potentials (MEPs) on ankle flexors and extensors at immediately, five and ten minutes after one minute static stretching applied at individual maximal ankle dorsiflexion, as well as immediately, five and ten minutes after a control period of same duration...
June 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28543271/characterisation-of-cellular-adhesion-reinforcement-by-multiple-bond-force-spectroscopy-in-alveolar-epithelial-cells
#14
Ngoc-Minh Nguyen, Christelle Angely, Sofia Andre Dias, Emmanuelle Planus, Marcel Filoche, Gabriel Pelle, Bruno Louis, Daniel Isabey
BACKGROUND INFORMATION: Integrin-mediated adhesion is a key process by which cells physically connect with their environment, and express sensitivity and adaptation through mechanotransduction. A critical step of cell adhesion is the formation of the first bonds which individually generate weak contacts (∼tens pN) but can sustain thousand times higher forces (∼tens nN) when associated. RESULTS: We propose an experimental validation by multiple bond force spectroscopy (MFS) of a stochastic model predicting adhesion reinforcement permitted by non-cooperative, multiple bonds on which force is homogeneously distributed (called parallel bond configuration)...
May 24, 2017: Biology of the Cell
https://www.readbyqxmd.com/read/28526627/dynamic-fatigue-measurement-of-human-erythrocytes-using-dielectrophoresis
#15
Yuhao Qiang, Jia Liu, E Du
Erythrocytes must undergo severe deformation to pass through narrow capillaries and submicronic splenic slits for several hundred thousand times in their normal lifespan. Studies of erythrocyte biomechanics have been mainly focused on cell deformability and rheology measured from a single application of stress and mostly under a static or quasi-static state using classical biomechanical techniques, such as optical tweezers and micropipette aspiration. Dynamic behavior of erythrocytes in response to cyclic stresses that contributes to the membrane failure in blood circulation is not fully understood...
May 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28503538/effects-of-a-static-stretch-using-a-load-on-low-back-pain-patients-with-shortened-tensor-fascia-lata
#16
Hae-In Bae, Dae-Young Kim, Yun-Hee Sung
Stretch of tensor fascia lata (TFL) improves range of motion on hip and pelvis and it reported to help reduce low back pain. Accordingly, the purpose of this study was to investigate effects of static stretching using a load on TFL in patients with low back pain. Twenty three subjects were recruited according to the selection criteria. The subjects were randomly assigned to static stretching group (control, n=12), and a static stretching using a load group (experimental, n=11). All group performed stretching for 15 min (side for 50 sec per time and a rest for 30 sec) per day in the left side and the right, respectively, for 2 weeks...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28486010/lymphatic-endothelial-cells-under-mechanical-stress-altered-expression-of-inflammatory-cytokines-and-fibrosis
#17
Sheri Wang, Daibang Nie, J Peter Rubin, Lauren Kokai
BACKGROUND: Secondary lymphedema, resulting from damage to lymphatic vessels, is a common sequela following surgical removal of lymph nodes for cancer. Current therapeutics for treating lymphedema are limited and further research on underlying causes is warranted. Published studies on molecular mechanisms of lymphedema primarily focus on lymphatic endothelial cells (LECs), which comprise the innermost lining of lymphatic capillaries and collecting vessels. However, traditional static culture of LECs may not adequately recapitulate the lymphedemous cell phenotype as transcriptomal comparison of human dermal LECs has shown significant differences in ex vivo and in vitro LEC gene expression...
June 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28479947/the-acute-effects-of-static-stretching-compared-to-dynamic-stretching-with-and-without-an-active-warm-up-on-anaerobic-performance
#18
Bradley J Kendall
The Wingate Anaerobic Test (WAnT) has been used in many studies to determine anaerobic performance. However, there has been poor reporting of warm-up protocols and limited consistency between warm-up methods that have been used. With the WAnT being such a commonly-used test, consistency in warm-up methods is essential in order to compare results across studies. Therefore, this study was designed to compare how static stretching, dynamic stretching, and an active warm-up affect WAnT performance. Ten recreationally active participants (5 males, 5 females) with a mean (SD) age of 23...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28459287/the-effects-of-varying-frequency-and-duration-of-mechanical-stimulation-on-a-tissue-engineered-tendon-construct
#19
Brandon Engebretson, Zachary R Mussett, Vassilios I Sikavitsas
Decellularized, discarded human tissues, such as the human umbilical vein, have been widely utilized for tissue engineering applications, including tendon grafts. When recellularized, such natural scaffolds are cultured in 3D dynamic culture environments (bioreactor systems). For tendon tissue-engineered grafts, such systems often employ oscillatory mechanical stimulation in the form uniaxial tensile strain. The three main parameters of such stimulation are frequency, duration, and force. In this study we investigated the effects of changing the duration (0...
May 1, 2017: Connective Tissue Research
https://www.readbyqxmd.com/read/28453873/induced-orientation-of-nitrogen-monoxide-and-azide-ion-vibrations-in-human-hemoglobin-in-bidistilled-water-solution-under-a-static-magnetic-field
#20
Emanuele Calabrò, Salvatore Magazù
In this study, we report the effects of static magnetic fields (SMFs) at 200 mT on different hemoglobin aqueous solutions, in the absence and in the presence of sucrose and trehalose, studied by FTIR spectroscopic techniques. Significant decrease in intensity of Amide I and Amide II vibration bands was observed after 6 h exposure for hemoglobin in bidistilled water solution. Also, it was observed that the decrease in intensity of the Amide I band was larger than the Amide II after exposure. This result can be explained assuming that an SMF induces increase of hydrogen bonding in hemoglobin in bidistilled water solution...
April 28, 2017: Bioelectromagnetics
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