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Static stretching

Benjamin S Killen, Krista L Zelizney, Xin Ye
CONTEXT: Static stretching (SS) and self-administered foam rolling (SAFR) are both effective techniques often used in rehabilitation settings to improve one's range-of-motion (ROM). However, their effects on non-intervened contralateral limb's performance remain equivocal. OBJECTIVE: To examine the acute effects of unilateral hamstrings SS and SAFR on the contralateral hip flexion passive ROM and the strength performance. DESIGN: Randomized crossover trial...
March 15, 2018: Journal of Sport Rehabilitation
Nikos C Apostolopoulos, Ian M Lahart, Michael J Plyley, Jack Taunton, Alan M Nevill, Yiannis Koutedakis, Matthew Wyon, George S Metsios
Effects of passive static stretching intensity on recovery from unaccustomed eccentric exercise of right knee extensors was investigated in 30 recreationally active males randomly allocated into three groups: high-intensity (70-80% maximum perceived stretch), low-intensity (30-40% maximum perceived stretch), and control. Both stretching groups performed 3 sets of passive static stretching exercises of 60s each for hamstrings, hip flexors, and quadriceps, over 3 consecutive days, post-unaccustomed eccentric exercise...
March 12, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Ewan Thomas, Antonino Bianco, Antonio Paoli, Antonio Palma
Different stretching strategies and protocols are widely used to improve flexibility or maintain health, acting on the muscle tendon-unit, in order to improve the range of motion (ROM) of the joints. This review aims to evaluate the current body of literature in order to understand the relation between stretching typology and ROM, and secondly to evaluate if a relation exists between stretching volume (either as a single training session, weekly training and weekly frequency) and ROM, after long-term stretching...
March 5, 2018: International Journal of Sports Medicine
T Álvarez-Yates, O García-García
The aim of this study was to determine de acute effect of an 8-weeks specific hamstring flexibility training on junior canoeist during the competition season. Sixteen canoeists participated, divided into 3 groups: 5 in Experimental Group 1 (EG1), 5 in Experimental Group 2 (EG2) and 6 in a Control Group (CG). The EG1 underwent a supervised program consisted by Simple Static Stretching, Dynamic Static Stretching and P.N.F. while the EG2 performed a program without P.N.F. and no supervision. Two measurements were performed to analyze the effect on the knee joint ROM and trunk flexion; neuromuscular and contractile properties in Biceps Femoris (BF) and Semitendinosus (ST) muscles; maximum power and average speed in lower limbs...
February 22, 2018: Journal of Strength and Conditioning Research
Alvenia Cairncross, Peter B Noble, Peter K McFawn
BACKGROUND AND OBJECTIVE: Lung hyperinflation and reduced bronchodilation to deep inspiration (DI) are features of chronic obstructive pulmonary disease (COPD). Hyperinflation might impair the ability of a DI to stretch airway smooth muscle (ASM), as the bronchi operate at a stiff region of the pressure-volume curve. METHODS: Bronchial segments from pig lungs were mounted in an organ bath and equilibrated at either 5 cm H2 O (control) or 20 cm H2 O (hyperinflated) transmural pressure (Ptm )...
February 20, 2018: Respirology: Official Journal of the Asian Pacific Society of Respirology
Jacob D Jelmini, Andrew Cornwell, Nazareth Khodiguian, Jennifer Thayer, And John Araujo
PURPOSE: To determine the effects of an acute bout of unilateral static stretching on handgrip strength of both the stretched and non-stretched limb. It was reasoned that if the non-stretched limb experienced a decrease in force output, further evidence for a neural mechanism to explain a post-stretch force reduction would be obtained as no mechanical adaptation would have occurred. METHODS: Thirty participants performed maximum voluntary unilateral handgrip contractions of both limbs before and after stretching the finger flexors of the strength-dominant side only...
February 16, 2018: European Journal of Applied Physiology
Alexander E J Hoffman, Louis Vanduyfhuys, Irena Nevjestić, Jelle Wieme, Sven M J Rogge, Hannes Depauw, Pascal Van Der Voort, Henk Vrielinck, Veronique Van Speybroeck
In this work, mid-infrared (mid-IR), far-IR, and Raman spectra are presented for the distinct (meta)stable phases of the flexible metal-organic framework MIL-53(Al). Static density functional theory (DFT) simulations are performed, allowing for the identification of all IR-active modes, which is unprecedented in the low-frequency region. A unique vibrational fingerprint is revealed, resulting from aluminum-oxide backbone stretching modes, which can be used to clearly distinguish the IR spectra of the closed- and large-pore phases...
February 8, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
T Putelat, P Recho, L Truskinovsky
The motility of a cell can be triggered or inhibited not only by an applied force but also by a mechanically neutral force couple. This type of loading, represented by an applied stress and commonly interpreted as either squeezing or stretching, can originate from extrinsic interaction of a cell with its neighbors. To quantify the effect of applied stresses on cell motility we use an analytically transparent one-dimensional model accounting for active myosin contraction and induced actin turnover. We show that stretching can polarize static cells and initiate cell motility while squeezing can symmetrize and arrest moving cells...
January 2018: Physical Review. E
Mohammadali Sharzehee, Seyed Saeid Khalafvand, Hai-Chao Han
Tortuous aneurysmal arteries are often associated with a higher risk of rupture but the mechanism remains unclear. The goal of this study was to analyze the buckling and post-buckling behaviors of aneurysmal arteries under pulsatile flow. To accomplish this goal, we analyzed the buckling behavior of model carotid and abdominal aorta with aneurysms by utilizing fluid-structure interaction (FSI) method with realistic waveforms boundary conditions. FSI simulations were done under steady-state and pulsatile flow for normal (1...
February 15, 2018: Computer Methods in Biomechanics and Biomedical Engineering
Erik P Rader, Marshall A Naimo, James Ensey, Brent A Baker
Utilization of high-intensity resistance training to counter age-related sarcopenia is currently debated because of the potential for maladaptation when training design is inappropriate. Training design is problematic because the influence of various loading variables (e.g. contraction mode, repetition number, and training frequency) is still not well characterized at old age. To address this in a precisely controlled manner, we developed a rodent model of high-intensity training consisting of maximally-activated stretch-shortening contractions (SSCs), contractions typical during resistance training...
February 10, 2018: Experimental Gerontology
Guang-Kui Xu, Xi-Qiao Feng, Huajian Gao
Mechanical cues from the microenvironments play a regulating role in many physiological and pathological processes, such as stem cell differentiation and cancer cell metastasis. Experiments showed that cells adhered on a compliant substrate may change orientation with an externally applied strain in the substrate. By accounting for actin polymerization, actin retrograde flow, and integrin binding dynamics, here we develop a mechanism-based tensegrity model to study the orientations of polarized cells on a compliant substrate under biaxial stretches...
February 6, 2018: Biophysical Journal
Colleen Hammelman
The survival strategies of migrant women living in urban poverty are embedded in urban food landscapes ('foodscapes') characterized by dynamic social relationships and mobility. Relying on interviews with 31 migrant women in Washington, DC, this paper traces the socio-spatial conditions of their urban foodscapes to show that urban environments inhabited by low-income migrants are dynamic, stretching across multiple neighborhoods as they move throughout the city with social networks to obtain affordable, quality, and culturally appropriate food...
January 31, 2018: Health & Place
Alireza F Behbahani, S Mehdi Vaez Allaei, Ghodratollah H Motlagh, Hossein Eslami, Vagelis A Harmandaris
Poly(methyl-methacrylate), PMMA, is a disubstituted vinyl polymer whose properties depend significantly on its tacticity. Here we present a detailed study of the structure, conformation, and dynamics of syndiotactic, atactic, and isotactic PMMA melts at various temperatures (580, 550, 520, and 490 K) via all-atom molecular dynamics simulations. The calculated volumetric properties are close to experimental data. The Tg and chain dimensions of PMMA model systems are found to depend strongly on tacticity in agreement with experimental findings...
February 2, 2018: Soft Matter
Shuangshuang Zhang, Shuanhu Qi, Leonid I Klushin, Alexander M Skvortsov, Dadong Yan, Friederike Schmid
We use Brownian dynamics simulations and analytical theory to compare two prominent types of single molecule transitions. One is the adsorption transition of a loop (a chain with two ends bound to an attractive substrate) driven by an attraction parameter ε and the other is the loop-stretch transition in a chain with one end attached to a repulsive substrate, driven by an external end-force F applied to the free end. Specifically, we compare the behavior of the respective order parameters of the transitions, i...
January 28, 2018: Journal of Chemical Physics
Samuel López Mariscal, Víctor Sánchez Garcia, José Carlos Fernández-García, Eduardo Sáez de Villarreal
The purpose of this study was to compare the effects of introducing passive static and ballistic stretching in a standard soccer match warm-up. The variables addressed were the Counter Movement Jump (CMJ), Abalakov jump and the 40 m linear sprint. The sample was composed of 33 male subjects, divided in two age groups. U16 and adult players formed the groups, in order to cross check if there were differences between them. Each group was further subdivided into two groups regarding the type of stretching carried out during the stretching phase...
January 30, 2018: Journal of Strength and Conditioning Research
P W Winwood, M K Dudson, D Wilson, J K H Mclaren-Harrison, V Redjkins, H J Pritchard, J W L Keogh
This study provides the first empirical evidence of how strongman athletes taper for strongman competitions. Strongman athletes (n=454) (mean ±SD: 33.2 ±8.0y, 178.1 ±10.6cm, 108.6 ±27.9kg, 12.6 ±8.9y general resistance training, 5.3 ±5.0y strongman implement training) completed a self-reported 4-page internet survey on tapering practices. Analysis by gender (male and female), age (≤ 30 and >30y), body mass (≤ 105 and >105kg) and competitive standard (local/regional amateur, national amateur and professional) was conducted...
January 24, 2018: Journal of Strength and Conditioning Research
Kenichiro Koshiyama, Keisuke Nishimoto, Satoshi Ii, Toshihiro Sera, Shigeo Wada
BACKGROUND: The pulmonary acinus is a dead-end microstructure that consists of ducts and alveoli. High-resolution micro-CT imaging has recently provided detailed anatomical information of a complete in vivo acinus, but relating its mechanical response with its detailed acinar structure remains challenging. This study aimed to investigate the mechanical response of acinar tissue in a whole acinus for static inflation using computational approaches. METHODS: We performed finite element analysis of a whole acinus for static inflation...
January 20, 2018: Clinical Biomechanics
Jeongok G Logan, Suk-Sun Kim, Mijung Lee, Ha Do Byon, SeonAe Yeo
BACKGROUND: Previous studies have demonstrated that arterial stiffness is associated with lumbar flexibility (LF). Stretching exercise targeted to improve LF may have a beneficial effect on reducing arterial stiffness. OBJECTIVES: We examined the effects of a single bout of a structured, static stretching exercise on arterial stiffness, LF, peripheral and central blood pressure (BP), and heart rate (HR) and tested the association between LF and central arterial stiffness...
January 23, 2018: Journal of Cardiovascular Nursing
Simone De Sio, Veronica Traversini, Francesca Rinaldo, Valerio Colasanti, Giuseppe Buomprisco, Roberto Perri, Federica Mormone, Giuseppe La Torre, Fabrizio Guerra
Introduction: Dental practitioners are exposed to different occupational hazards during the course of their professional activity, such as physical, chemical, biological, ergonomic factors. The ergonomic hazards, caused by strained posture and prolonged repetitive movements, can induce musculoskeletal disorders. It occurs in 54-93% of dental professionals and involve the spine, shoulder and hand-wrist tract. Through a systematic review of international literature, we analyzed specific ergonomic risk factors and preventive measures of musculoskeletal disorders in professional dental activity...
2018: PeerJ
Biswarup Ash, J Chakrabarti, Amit Ghosal
We study the temperature dependence of static and dynamic responses of Coulomb interacting particles in two-dimensional confinements across the crossover from solid- to liquid-like behaviors. While static correlations that investigate the translational and bond orientational order in the confinements show the footprints of hexatic-like phase at low temperatures, dynamics of the particles slow down considerably in this phase, reminiscent of a supercooled liquid. Using density correlations, we probe long-lived heterogeneities arising from the interplay of the irregularity in the confinement and long-range Coulomb interactions...
October 2017: Physical Review. E
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