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https://www.readbyqxmd.com/read/28526627/dynamic-fatigue-measurement-of-human-erythrocytes-using-dielectrophoresis
#1
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 16, 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
#2
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
#3
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...
May 9, 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
#4
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
#5
Brandon Engebretson, Zachary R Mussett, Vassilios I Sikavitsas
Decellularized, discarded human tissues like 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
#6
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
https://www.readbyqxmd.com/read/28444436/acute-effects-of-static-stretching-on-muscle-tendon-mechanics-of-quadriceps-and-plantar-flexor-muscles
#7
Tom Bouvier, Jules Opplert, Carole Cometti, Nicolas Babault
PURPOSE: This study aimed to determine the acute effects of static stretching on stiffness indexes of two muscle groups with a contrasting difference in muscle-tendon proportion. METHODS: Eleven active males were tested on an isokinetic dynamometer during four sessions randomly presented. Two sessions were dedicated to quadriceps and the two others to triceps surae muscles. Before and immediately after the stretching procedure (5 × 30 s), gastrocnemius medialis and rectus femoris fascicle length and myotendinous junction elongation were determined using ultrasonography...
April 25, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28409517/could-the-negative-effects-of-static-stretching-in-warm-up-be-restored-by-sport-specific-exercise
#8
Victor Bengtsson, Ji-Guo Yu, Kajsa Gilenstam
BACKGROUND: Static stretching (SS) is widely used in warm-up as it is generally believed to increase mobility and reduce the risk of injury; however, SS has been shown to induce transient negative effects on subsequent muscle performance. Interestingly, recent studies have shown that sport specific exercise could restore SS-induced negative effects on certain sports, especially of explosive muscular performance. Whether sport specific exercise could restore SS-induced negative effects on isokinetic muscle performance remains unclear...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409512/immediate-effects-of-different-types-of-stretching-exercises-on-badminton-jump-smash
#9
Hwi S Jang, Daeho Kim, Jihong Park
BACKGOUND: Since different types of stretching exercises may alter athletic performance, we compared the effects of three types of stretching exercises on badminton jump smash. METHODS: Sixteen male collegiate badminton players performed one of three different stretching exercises in a counterbalanced order on different days. Static stretching had seven typical stretches, while dynamic stretching involved nine dynamic movements, and resistance dynamic stretching was performed with weighted vests and dumbbells...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28397006/acute-effect-of-stretching-one-leg-on-regional-arterial-stiffness-in-young-men
#10
Yosuke Yamato, Natsuki Hasegawa, Shumpei Fujie, Shigehiko Ogoh, Motoyuki Iemitsu
PURPOSE: Our previous study demonstrated that a single bout of stretching exercises acutely reduced arterial stiffness. We hypothesized that this acute vascular response is due to regional mechanical stimulation of the peripheral arteries. To test this hypothesis, we examined the effect of a single bout of passive one leg stretching on arterial stiffness, comparing the stretched and the non-stretched leg in the same subject. METHODS: Twenty-five healthy young men (20...
April 10, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28395147/acute-effect-of-stretching-modalities-on-global-coordination-and-kicking-accuracy-in-12-13year-old-soccer-players
#11
Mohamed Frikha, Mohammad S Derbel, Nesrine Chaâri, Adnene Gharbi, Karim Chamari
The aim of the study was to compare the effect of stretching procedures on global coordination and accuracy in instep soccer kicks achieved in different stress conditions. Twenty male young soccer players completed the global coordination test (GC), the instep kicking accuracy test in free (FKA) and in time-pressure (TPKA) conditions, either after static (SS), dynamic (DS), ballistic (BS) or no-stretching (CTR) protocols, on nonconsecutive days and in a randomized order. After performing a 5min standardized intensity jogging (70% of MAV), followed by stretching exercises for 10min, each participant completed, successively, the GC, FKA and TPKA tests...
April 7, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28394655/stretch-induced-apoptosis-in-rat-alveolar-epithelial-cells-is-mediated-by-the-intrinsic-mitochondrial-pathway
#12
Hartmut Kuhn, Hendrik Nieuwenhuijsen, Bianca Karthe, Hubert Wirtz
BACKGROUND: Alveolar type II (ATII) cells in the lung are exposed to mechanical stretch during breathing and mechanical ventilation. Increased mechanical stretch contributes to lung injury by induction of apoptosis and necrosis in ATII cells. AIM OF THE STUDY: In this study, we investigated the intrinsic and the extrinsic apoptosis pathways, and their involvement in our model of stretch-induced apoptosis. MATERIAL AND METHODS: ATII cells were stretched on elastic membranes for 24 h and apoptosis was determined at different time points...
February 2017: Experimental Lung Research
https://www.readbyqxmd.com/read/28380974/waveguiding-characteristics-of-surface-enhanced-raman-scattering-signals-along-crystalline-organic-semiconducting-microrod
#13
Seong Gi Jo, Bong Gi Kim, Jinsang Kim, JeongYong Kim, Jinsoo Joo
The waveguiding of surface enhanced Raman scattering (SERS) signals was demonstrated by using organic semiconducting microrods (MRs) hybridized with functionalized gold nanoparticles (Au-NPs). Organic semiconducting 1,4-bis(3,5-bis(trifluoromethyl) styryl)-2,5-dibromobenzene (TSDB) crystalline MRs were fabricated as active optical waveguiding system using a self-assembly method. The static SERS effect and the enhancement of photoluminescence were simultaneously observed for the TSDB MRs hybridized with Au-NPs...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28366004/physicochemical-evidence-on-sublethal-neonicotinoid-imidacloprid-interacting-with-an-odorant-binding-protein-from-the-tea-geometrid-moth-ectropis-obliqua
#14
Hongliang Li, Lei Zhao, Xiaobin Fu, Xinmi Song, Fan Wu, Mingzhu Tang, Hongchun Cui, Jizhong Yu
Nowadays the excessive usage of neonicotinoid insecticides always results in residues in Chinese tea fields. It is not clear whether the insecticide residue at the sublethal level influences the physiological processes of tea pests. Here, we provide evidence of interaction between the neonicotinoid imidacloprid and a general odorant-binding protein, EoblGOBP2, from the tea geometrid moth, Ectropis obliqua. The interacting process was demonstrated through multiple fluorescence spectra, UV absorption spectra, circular dichroism (CD) spectra, molecular docking, etc...
April 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28364981/heightened-pelvic-floor-muscle-tone-and-altered-contractility-in-women-with-provoked-vestibulodynia
#15
Mélanie Morin, Yitzchak M Binik, Daniel Bourbonnais, Samir Khalifé, Stéphane Ouellet, Sophie Bergeron
BACKGROUND: Pelvic floor muscle (PFM) dysfunctions are reported to be involved in provoked vestibulodynia (PVD). Although heightened PFM tone has been suggested, the relative contribution of active and passive components of tone remains misunderstood. Likewise, alterations in PFM contractility have been scarcely studied. AIMS: To compare PFM tone, including the relative contribution of its active and passive components, and muscular contractility in women with PVD and asymptomatic controls...
April 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28358962/vegf-as-a-paracrine-regulator-of-conventional-outflow-facility
#16
Ester Reina-Torres, Joanne C Wen, Katy C Liu, Guorong Li, Joseph M Sherwood, Jason Y H Chang, Pratap Challa, Cassandra M Flügel-Koch, W Daniel Stamer, R Rand Allingham, Darryl R Overby
Purpose: Vascular endothelial growth factor (VEGF) regulates microvascular endothelial permeability, and the permeability of Schlemm's canal (SC) endothelium influences conventional aqueous humor outflow. We hypothesize that VEGF signaling regulates outflow facility. Methods: We measured outflow facility (C) in enucleated mouse eyes perfused with VEGF-A164a, VEGF-A165b, VEGF-D, or inhibitors to VEGF receptor 2 (VEGFR-2). We monitored VEGF-A secretion from human trabecular meshwork (TM) cells by ELISA after 24 hours of static culture or cyclic stretch...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28355630/inferring-the-stiffness-of-unfamiliar-objects-from-optical-shape-and-motion-cues
#17
Filipp Schmidt, Vivian C Paulun, Jan Jaap R van Assen, Roland W Fleming
Visually inferring the stiffness of objects is important for many tasks but is challenging because, unlike optical properties (e.g., gloss), mechanical properties do not directly affect image values. Stiffness must be inferred either (a) by recognizing materials and recalling their properties (associative approach) or (b) from shape and motion cues when the material is deformed (estimation approach). Here, we investigated interactions between these two inference types. Participants viewed renderings of unfamiliar shapes with 28 materials (e...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28351803/establishing-a-reliable-gait-evaluation-method-for-rodent-studies
#18
Huanwen Chen, Jian Du, Yifan Zhang, Kevin Barnes, Xiaofeng Jia
BACKGROUND: CatWalk is one of the most popular tools for evaluating gait recovery in preclinical research, however, there is currently no consensus on which of the many gait parameters captured by CatWalk can reliably model recovery. There are conflicting interpretations of results, along with many common but seldom reported problems such as heel walking and poor compliance. NEW METHOD: We developed a systematic manual classification method that overcomes common problems such as heel walking and poor compliance...
March 27, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28349928/corrugated-textile-based-triboelectric-generator-for-wearable-energy-harvesting
#19
A Young Choi, Chang Jun Lee, Jiwon Park, Dogyun Kim, Youn Tae Kim
Triboelectric energy harvesting has been applied to various fields, from large-scale power generation to small electronics. Triboelectric energy is generated when certain materials come into frictional contact, e.g., static electricity from rubbing a shoe on a carpet. In particular, textile-based triboelectric energy-harvesting technologies are one of the most promising approaches because they are not only flexible, light, and comfortable but also wearable. Most previous textile-based triboelectric generators (TEGs) generate energy by vertically pressing and rubbing something...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28344445/effects-of-static-and-dynamic-stretching-on-the-isokinetic-peak-torques-and-electromyographic-activities-of-the-antagonist-muscles
#20
Abdullah Serefoglu, Ufuk Sekir, Hakan Gür, Bedrettin Akova
The aim of this study was to investigate if static and dynamic stretching exercises of the knee muscles (quadriceps and hamstring muscles) have any effects on concentric and eccentric isokinetic peak torques and electromyographic amplitudes (EMG) of the antagonist muscles. Twenty healthy male athletes (age between 18-30 years) voluntarily participated in this study. All of the subjects visited the laboratory to complete the following intervention in a randomized order on 5 separate days; (a) non-stretching (control), (b) static stretching of the quadriceps muscles, (c) static stretching of the hamstring muscles, (d) dynamic stretching of the quadriceps muscles, and (e) dynamic stretching of the hamstring muscles...
March 2017: Journal of Sports Science & Medicine
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