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https://www.readbyqxmd.com/read/28916583/a-balance-and-proprioception-intervention-programme-to-enhance-combat-performance-in-military-personnel
#1
Shany Funk, T Jacob, D Ben-Dov, E Yanovich, O Tirosh, N Steinberg
BACKGROUND: Optimal functioning of the lower extremities under repeated movements on unstable surfaces is essential for military effectiveness. Intervention training to promote proprioceptive ability should be considered in order to limit the risk for musculoskeletal injuries. The aim of this study was to assess the effect of a proprioceptive intervention programme on static and dynamic postural balance among Israel Defense Forces combat soldiers. METHODS: Twenty-seven male soldiers, aged 18-20 years, from a physical fitness instructor's course, were randomly divided into two groups matched by age and army unit...
September 14, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28904080/pressure-and-stretch-differentially-affect-proliferation-of-renal-proximal-tubular-cells
#2
Diane Felsen, Bianca J Diaz, Jie Chen, Juana Gonzalez, Marie Louise V Kristensen, Anja B Bohn, Brendan T Roth, Dix P Poppas, Rikke Nørregaard
Renal obstruction is frequently found in adults and children. Mechanical stimuli, including pressure and stretch in the obstructed kidney, contribute to damage; animal models of obstruction are characterized by increased cellular proliferation. We were interested in the direct effects of pressure and stretch on renal tubular cell proliferation. Human HKC-8 or rat NRK-52E proximal tubule cells were subjected to either pressure [0, 60 or 90 mmHg] or static stretch [0 or 20%] for 24 or 48 h. Cell proliferation was measured by cell counting, cell cycle analyzed by flow cytometry, and PCNA and Skp2 expression were determined by qPCR or western blot...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28891508/spike-propagation-in-axons-under-stretch-growth-conditions-in-cultured-neurons-from-dorsal-root-ganglion
#3
Xiao Li, Qi Xu, Jiping He
Computational software NEURON was used to simulate the stretch growth neurons in order to investigate the ability of dorsal root ganglion neurons to generate and propagate action potentials after a period of rapid axon stretch growth in vitro, and under what stimulating parameters can evoke action potentials. In the simulation, we found the stretch growth neuron had higher spike amplitude than from the static culture neuron in the soma and all axonal branch. In addition, the conduction velocity was also faster in the stretch growth axon...
2017: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/28888207/acute-changes-of-hip-joint-range-of-motion-using-selected-clinical-stretching-procedures-a-randomized-crossover-study
#4
Adam M Hammer, Roger L Hammer, Karen V Lomond, Paul O'Connor
BACKGROUND: Hip adductor flexibility and strength is an important component of athletic performance and many activities of daily living. Little research has been done on the acute effects of a single session of stretching on hip abduction range of motion (ROM). OBJECTIVES: The aim of this study was to compare 3 clinical stretching procedures against passive static stretching and control on ROM and peak isometric maximal voluntary contraction (MVC). DESIGN: Using a randomized crossover study design, a total of 40 participants (20 male and 20 female) who had reduced hip adductor muscle length attended a familiarization session and 5 testing sessions on non-consecutive days...
September 1, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28841537/effect-of-static-and-dynamic-muscle-stretching-as-part-of-warm-up-procedures-on-knee-joint-proprioception-and-strength
#5
Gregory S Walsh
BACKGROUND: The importance of warm up procedures prior to athletic performance is well established. A common component of such procedures is muscle stretching. There is conflicting evidence regarding the effect of static stretching (SS) as part of warm up procedures on knee joint position sense (KJPS) and the effect of dynamic stretching (DS) on KJPS is currently unknown. The aim of this study was to determine the effect of dynamic and static stretching as part warm up procedures on KJPS and knee extension and flexion strength...
August 22, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28831626/fabrication-and-characterization-of-low-cost-bead-free-durable-and-hydrophobic-electrospun-membrane-for-3d-cell-culture
#6
Hajar Moghadas, Mohammad Said Saidi, Navid Kashaninejad, Amir Kiyoumarsioskouei, Nam-Trung Nguyen
This paper reports the fabrication of electrospun polydimethylsiloxane (PDMS) membranes/scaffolds that are suitable for three-dimensional (3D) cell culture. Through modification the ratio between PDMS and polymethylmethacrylate (PMMA) as carrier polymer, we report the possibility of increasing PDMS weight ratio of up to 6 for electrospinning. Increasing the PDMS content increases the fiber diameter, the pore size, and the hydrophobicity. To our best knowledge, this is the first report describing beads-free, durable and portable electrospun membrane with maximum content of PDMS suitable for cell culture applications...
August 22, 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28814062/change-detection-technique-for-muscle-tone-during-static-stretching-by-continuous-muscle-viscoelasticity-monitoring-using-wearable-indentation-tester
#7
Naomi Okamura, Yo Kobayashi, Shigeki Sugano, Masakatsu G Fujie
Static stretching is widely performed to decrease muscle tone as a part of rehabilitation protocols. Finding out the optimal duration of static stretching is important to minimize the time required for rehabilitation therapy and it would be helpful for maintaining the patient's motivation towards daily rehabilitation tasks. Several studies have been conducted for the evaluation of static stretching; however, the recommended duration of static stretching varies widely between 15-30 s in general, because the traditional methods for the assessment of muscle tone do not monitor the continuous change in the target muscle's state...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814042/portable-haptic-device-for-lower-limb-amputee-gait-feedback-assessing-static-and-dynamic-perceptibility
#8
M A B Husman, H F Maqbool, M I Awad, A A Dehghani-Sanij
Loss of joints and severed sensory pathway cause reduced mobility capabilities in lower limb amputees. Although prosthetic devices attempt to restore normal mobility functions, lack of awareness and control of limb placement increase the risk of falling and causing amputee to have high level of visual dependency. Haptic feedback can serve as a cue for gait events during ambulation thus providing sense of awareness of the limb position. This paper presents a wireless wearable skin stretch haptic device to be fitted around the thigh region...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28801950/can-chronic-stretching-change-the-muscle-tendon-mechanical-properties-a-review
#9
REVIEW
Sandro R Freitas, Bruno Mendes, Guillaume Le Sant, Ricardo J Andrade, Antoine Nordez, Zoran Milanovic
PURPOSE: It is recognized that stretching is an effective method to chronically increase the joint range of motion. However, the effects of stretching training on the muscle-tendon structural properties remain unclear. This systematic review with meta-analysis aimed to determine whether chronic stretching alter the muscle-tendon structural properties. METHODS: Published papers regarding longitudinal stretching (static, dynamic and/or PNF) intervention (either randomized or not) in humans of any age and health status, with more than 2 weeks in duration and at least 2 sessions per week, were searched in PubMed, PEDro, ScienceDirect and ResearchGate databases...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28796528/acute-passive-static-stretching-and-cramp-threshold-frequency
#10
Gino Panza, Justin Stadler, Donal Murray, Nicholas Lerma, Tomas Barrett, Ryan Pettit-Mee, Jeffrey E Edwards
CONTEXT:   Exercise-associated muscle cramps are a common clinical problem for athletes. OBJECTIVE:   To determine whether acute passive static stretching altered cramp threshold frequency (CTF) of electrically induced muscle cramps. DESIGN:   Crossover study. SETTING:   Laboratory. PATIENTS OR OTHER PARTICIPANTS:   Seventeen healthy college-aged individuals. INTERVENTION(S):   Stretching or no stretching...
August 10, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28796278/prophylactic-stretching-does-not-reduce-cramp-susceptibility
#11
Kevin C Miller, James D Harsen, Blaine C Long
INTRODUCTION: Some clinicians advocate stretching to prevent muscle cramps. It is unknown whether static or proprioceptive neuromuscular facilitation (PNF) stretching increases cramp threshold frequency (TFc ), a quantitative measure of cramp susceptibility. METHODS: Fifteen individuals completed this randomized, counterbalanced, cross-over study. We measured passive hallux range of motion (ROM) and then performed 3 minutes of either static stretching, PNF stretching (hold-relax-with agonist contraction), or no stretching...
August 10, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28783560/a-study-of-extracellular-matrix-remodeling-in-aortic-heart-valves-using-a-novel-biaxial-stretch-bioreactor
#12
Ying Lei, Shirin Masjedi, Zannatul Ferdous
In aortic valves, biaxial cyclic stretch is known to modulate cell differentiation, extracellular matrix (ECM) synthesis and organization. We designed a novel bioreactor that can apply independent and precise stretch along radial and circumferential directions in a tissue culture environment. While this bioreactor can be used for either native or engineered tissues, this study determined matrix remodeling and strain distribution of aortic cusps after culturing under biaxial stretch for 14 days. The contents of collagen and glycosaminoglycans were determined using standard biochemical assays and compared with fresh controls...
July 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28768878/controllable-biomimetic-birdsong
#13
Aryesh Mukherjee, Shreyas Mandre, L Mahadevan
Birdsong is the product of the controlled generation of sound embodied in a neuromotor system. From a biophysical perspective, a natural question is that of the difficulty of producing birdsong. To address this, we built a biomimetic syrinx consisting of a stretched simple rubber tube through which air is blown, subject to localized mechanical squeezing with a linear actuator. A large static tension on the tube and small dynamic variations in the localized squeezing allow us to control transitions between three states: a quiescent state, a periodic state and a solitary wave state...
August 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28761702/static-stretching-does-not-enhance-recovery-in-elite-youth-soccer-players
#14
Sam Pooley, Owen Spendiff, Matt Allen, Hannah J Moir
BACKGROUND: Static stretching (SS) is a recovery intervention used for the reduction of muscle soreness postexercise. The effects of SS on elite young footballers have received little attention, and therefore the aim of this study was to assess the effects of SS on muscle recovery following competitive soccer matches in elite young footballers. METHODS: Ten male participants (16±1 years) were recruited from an English Premier League professional soccer academy...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/28750979/acute-effects-of-self-myofascial-release-and-stretching-in-overhead-athletes-with-gird
#15
Ryan R Fairall, Lee Cabell, Richard J Boergers, Fortunato Battaglia
OBJECTIVE: To examine the acute effects of self-myofascial release (SMR), static stretching (SS), and the combination of self-myofascial release and static stretching (SMR + SS) on glenohumeral internal rotation range of motion (GH IR ROM) in overhead athletes with glenohumeral internal rotation deficit (GIRD). PARTICIPANTS: Twelve asymptomatic adult male amateur softball position players exhibiting GIRD. RESULTS: All three methods significantly improved GH IR ROM...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28747398/a-durable-and-biocompatible-ascorbic-acid-based-covalent-coating-method-of-polydimethylsiloxane-for-dynamic-cell-culture
#16
Joni Leivo, Sanni Virjula, Sari Vanhatupa, Kimmo Kartasalo, Joose Kreutzer, Susanna Miettinen, Pasi Kallio
Polydimethylsiloxane (PDMS) is widely used in dynamic biological microfluidic applications. As a highly hydrophobic material, native PDMS does not support cell attachment and culture, especially in dynamic conditions. Previous covalent coating methods use glutaraldehyde (GA) which, however, is cytotoxic. This paper introduces a novel and simple method for binding collagen type I covalently on PDMS using ascorbic acid (AA) as a cross-linker instead of GA. We compare the novel method against physisorption and GA cross-linker-based methods...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28746858/modeling-of-biomechanics-and-biorheology-of-red-blood-cells-in-type-2-diabetes-mellitus
#17
Hung-Yu Chang, Xuejin Li, George Em Karniadakis
Erythrocytes in patients with type-2 diabetes mellitus (T2DM) are associated with reduced cell deformability and elevated blood viscosity, which contribute to impaired blood flow and other pathophysiological aspects of diabetes-related vascular complications. In this study, by using a two-component red blood cell (RBC) model and systematic parameter variation, we perform detailed computational simulations to probe the alteration of the biomechanical, rheological, and dynamic behavior of T2DM RBCs in response to morphological change and membrane stiffening...
July 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28746246/acute-effects-of-constant-angle-and-constant-torque-static-stretching-on-passive-stiffness-of-the-posterior-hip-and-thigh-muscles-in-healthy-young-and-old-men
#18
Ty B Palmer
The purpose of this study was to examine the acute effects of constant-angle (CA) and constant-torque (CT) static stretching on passive stiffness of the posterior hip and thigh muscles in healthy, young and old men. Fifteen young (25±3 years) and 15 old (71±4 years) men underwent 2 passive straight-leg raise (SLR) assessments before and after 8 min of CA and CT stretching using an isokinetic dynamometer. Passive stiffness was calculated during each SLR as the slope of the final 10% of the angle-torque curve...
July 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28742609/the-efficacy-of-dynamic-contract-relax-stretching-on-delayed-onset-muscle-soreness-among-healthy-individuals-a-randomized-clinical-trial
#19
Yanfei Xie, Beibei Feng, Kedi Chen, Lars L Andersen, Phil Page, Yuling Wang
OBJECTIVE: To evaluate the efficacy of dynamic contract-relax stretching on delayed-onset muscle soreness (DOMS) in the calf muscle of healthy individuals. DESIGN: Randomized clinical trial. SETTING: Research laboratory. PARTICIPANTS: Three groups of 16 healthy participants (n = 48) were recruited by convenience sampling. INTERVENTIONS: Three sets of resisted bilateral heel-raising exercises until exhaustion were conducted to initiate DOMS...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28731145/piezo1-protein-induces-the-apoptosis-of-human-osteoarthritis-derived-chondrocytes-by-activating-caspase-12-the-signaling-marker-of-er-stress
#20
Xiao-Fei Li, Zhao Zhang, Zhu-Ke Chen, Zhao-Wei Cui, Hai-Ning Zhang
The present study was carried out to determine whether the mechanically activated cation channel Piezo1 protein plays a role as a signaling pathway which causes the apoptosis of human chondrocytes. The chondrocytes were isolated, cultured, and then subjected to mechanical stretch force for 0, 2, 12, 24 and 48 h, respectively. The expression levels of Piezo1 and the apoptosis-related protein caspase-12 were assessed by reverse transcription-quantitative polymerase chain reaction, as well as the apoptosis-related genes, B cell lymphoma/leukemia-2 (Bcl-2), Bcl-associated X protein (Bax) and Bcl-2-associated death promoter (BAD)...
September 2017: International Journal of Molecular Medicine
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