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Strength resistance

Subir Ghosh, Sylvester Abanteriba, Sherman Wong, Shadi Houshyar
A significant number of hip replacements (HR) fail permanently despite the success of the medical procedure, due to wear and progressive loss of osseointegration of implants. An ideal model should consist of materials with a high resistance to wear and with good biocompatibility. This study aims to develop a new method of grafting the surface of selective laser melted (SLM) titanium alloy (Ti-6Al-4V) with poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC), to improve the surface properties and biocompatibility of the implant...
July 24, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Tommy R Lundberg, Glyn Howatson
Over-the-counter analgesics, such as anti-inflammatory drugs (NSAIDs) and paracetamol, are widely consumed by athletes worldwide to increase pain tolerance, or dampen pain and reduce inflammation from injuries. Given that these drugs also can modulate tissue protein turnover, it is important to scrutinize the implications of acute and chronic use of these drugs in relation to exercise performance and the development of long-term training adaptations. In this review we aim to provide an overview of the studies investigating the effects of analgesic drugs on exercise performance and training adaptations relevant for athletic development...
August 13, 2018: Scandinavian Journal of Medicine & Science in Sports
Danyal A Siddiqui, Lidia Guida, Sathyanarayanan Sridhar, Pilar Valderamma, Thomas G Wilson, Danieli C Rodrigues
BACKGROUND: Titanium (Ti) dominates as the material of choice for dental implant systems. Recently, titanium-zirconium alloy (TiZr) and zirconia (ZrO₂ ) have emerged as alternative materials due to higher mechanical strength and lower corrosion susceptibility. Oral pathogenic bacteria can colonize Ti surfaces, leading to surface degradation, which has yet to be investigated on TiZr and ZrO2 . The aim of this study was to compare in vitro oral bacterial adhesion and subsequent surface degradation on commercial Ti, TiZr, and ZrO2 implants...
August 13, 2018: Journal of Periodontology
Fawn M Weihl, Gary P Van Guilder
Weihl, FM and Van Guilder, GP. Endothelial vasodilation after a high-volume training load and tapered training in collegiate female swimmers. J Strength Cond Res XX(X): 000-000, 2018-High-volume endurance training loads have been linked to adverse remodeling of the heart and large arteries; yet, data on the vascular endothelial function are unclear. Moreover, although collegiate-level endurance athletes often perform high-volumes of vigorous endurance training and resistance training as part of their strength and conditioning programs, it is unknown whether they also experience vascular abnormalities, particularly changes in endothelial function...
August 10, 2018: Journal of Strength and Conditioning Research
Filipe J Teixeira, Catarina N Matias, Cristina P Monteiro, Maria J Valamatos, Joana Reis, Francisco Tavares, Ana Batista, Christophe Domingos, Francisco Alves, Luís B Sardinha, Stuart M Phillips
Leucine metabolites, α-hydroxyisocaproic acid (α-HICA) and β-hydroxy-β-methylbutyrate (calcium, HMB-Ca and free acid, HMB-FA), have been proposed to augment resistance training-induced changes in body composition and performance. PURPOSE: We aimed to conduct a double-blind randomized controlled pragmatic trial to evaluate the effects of off-the-shelf leucine metabolite supplements of α-HICA, HMB-FA and HMB-Ca, on resistance training-induced changes in muscle thickness, and performance...
August 10, 2018: Medicine and Science in Sports and Exercise
Hojun Lee, Kijeong Kim, Boa Kim, Junchul Shin, Sudarsan Rajan, Jingwei Wu, Xiongwen Chen, Michael D Brown, Sukho Lee, Joon-Young Park
KEY POINTS: Referring to the muscle memory theory, previously trained muscles acquire strength and volume much faster than naive muscles. Using extreme experimental models such as synergist ablation or steroid administration, previous studies have demonstrated that the number of nuclei increases when a muscle becomes enlarged, which serves as a cellular muscle memory mechanism for the muscle. In the present study, we found that, when rats were subjected to physiologically relevant resistance training, the number of myonuclei increased and was retained during a long-term detraining period...
August 12, 2018: Journal of Physiology
Niko S Wasenius, Mika Simonen, Liisa Penttinen, Minna K Salonen, Samuel Sandboge, Johan G Eriksson
PURPOSE: Maternal obesity can unfavorably influence offspring body composition, muscle strength, and possibly muscle's adaptability to training, but the human studies are scarce. Therefore, we aimed to investigate the effect of maternal obesity on offspring muscle strength responses to resistance training intervention in elderly frail women. MATERIALS/METHODS: Recruited participants were elderly frail women offspring of lean/normal weight mothers (n = 19, mean body mass index (BMI): 22...
August 9, 2018: Advances in Medical Sciences
Anne Tournadre, Gaelle Vial, Frédéric Capel, Martin Soubrier, Yves Boirie
Sarcopenia is defined as a combination of low muscle mass with low muscle function. The term was first used to designate the loss of muscle mass and performance associated with aging. Now, recognized causes of sarcopenia also include chronic disease, a physically inactive lifestyle, loss of mobility, and malnutrition. Sarcopenia should be differentiated from cachexia, which is characterized not only by low muscle mass but also by weight loss and anorexia. Sarcopenia results from complex and interdependent pathophysiological mechanisms that include aging, physical inactivity, neuromuscular compromise, resistance to postprandial anabolism, insulin resistance, lipotoxicity, endocrine factors, oxidative stress, mitochondrial dysfunction, and inflammation...
August 8, 2018: Joint, Bone, Spine: Revue du Rhumatisme
Ihsan Chrifi, Laura Louzao-Martinez, Maarten M Brandt, Christian G M van Dijk, Petra E Bürgisser, Changbin Zhu, Johan M Kros, Marianne C Verhaar, Dirk J Duncker, Caroline Cheng
Vascular endothelial (VE) cadherin is a key component of endothelial adherens junctions (AJs) and plays an important role in maintaining vascular integrity. Endocytosis of VE-cadherin regulates junctional strength and a decrease of surface VE-cadherin reduces vascular stability. However, disruption of AJs is also a requirement for vascular sprouting. Identifying novel regulators of endothelial endocytosis could enhance our understanding of angiogenesis. Here, we evaluated the angiogenic potential of (CKLF-like MARVEL transmembrane domain 4) CMTM4 and assessed in which molecular pathway CMTM4 is involved during angiogenesis...
August 10, 2018: Angiogenesis
Justin J Merrigan, Jason B White, Y Eliot Hu, Jason D Stone, Jonathan M Oliver, Margaret T Jones
PURPOSE: Muscular strength is suggested to be dependent upon muscle characteristics. Yet, sex-specific relationships of muscle characteristics to strength in the resistance-trained require investigation. Therefore, the purpose was to evaluate sex differences in muscle characteristics and isometric strength in the elbow extensors, as well as their respective associations. METHODS: Resistance-trained men (n = 15, mean ± SD 22 ± 4 years, 87.5 ± 12...
August 10, 2018: European Journal of Applied Physiology
Mehran Alavi, Naser Karimi
Fighting of current antibiotics against multidrug-resistant (MDR) bacteria has not been completely successful. In this study, the bio-synthesized Ag-TiO2 , TiO2 -Ag, Ag-Cu and Cu-Ag nanocomposites (NCs) were used against MDR bacteria including Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853 (gram negative) and Staphylococcus aureus ATCC 43300 (gram positive). Antiplanktonic, antibiofilm, antiswarming motility and antiquorum sensing activities of these four NCs were measured by assays of agar well diffusion, minimum inhibition/minimum bactericidal concentrations (MIC/MBC), biofilm formation, biofilm morphology and pyocyanin amounts...
August 10, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Brendan R Vahey, Mariane B Sordi, Kyle Stanley, Ricardo S Magini, Antonio P Novaes de Oliveira, Márcio C Fredel, Bruno Henriques, Júlio C M Souza
STATEMENT OF PROBLEM: The improved esthetics of ceramic dental prostheses has increased their popularity, although their high elastic modulus and low fracture toughness and tensile strength may reduce the long-term performance of dental prostheses. PURPOSE: The purpose of this in vitro study was to assess the mechanical integrity of zirconium-lithium silicate glass-ceramic crowns cement- and screw-retained to a titanium implant-abutment after fatigue. MATERIAL AND METHODS: Forty titanium implants were placed in polyacetal to mimic bone support...
August 7, 2018: Journal of Prosthetic Dentistry
Kuang-Tai Kuo, Wen-Chien Huang, Oluwaseun Adebayo Bamodu, Wei-Hwa Lee, Chun-Hua Wang, M Hsiao, Liang-Shun Wang, Chi-Tai Yeh
BACKGROUND: Lung cancer is the leading cause of cancer death worldwide. Recently, epigenetic dysregulation has been known to promote tumor progression and therefore may be a therapeutic target for anticancer therapy. JARID1B, a member of histone demethylases, has been found to be related to tumorigenesis in certain kinds of cancers. However, its biological roles in non-small cell lung cancer (NSCLC) remain largely unclear. METHODS: We firstly examined the expression of JARID1B in surgical specimens and six NSCLC cell lines...
August 9, 2018: Clinical Epigenetics
Hui-Min Li, Ren-Jie Zhang, Hai Gao, Chong-Yu Jia, Tao Xing, Jian-Xiang Zhang, Fu-Long Dong, Cai-Liang Shen
OBJECTIVE: Selecting optimal strategies for improving fixation in the osteoporotic lumbar spine remains an important issue in clinical research. Cortical bone trajectory (CBT) screws have been proven to enhance screw pullout strength. However, the biomechanical efficacy of these screws remains understudied. The aim of this study was to evaluate the biomechanical efficacy of CBT screws in the osteoporotic lumbar spine. METHODS: A total of 31 vertebrae from 14 cadaveric lumbar spines were obtained...
August 6, 2018: World Neurosurgery
Mette Flindt Heisterberg, Jesper Løvind Andersen, Peter Schjerling, Alberte Lund, Simone Dalskov, Anders Overgård Jønsson, Nichlas Warming, Mathilde Fogelstrøm, Michael Kjaer, Abigail Louise Mackey
PURPOSE: To investigate the potential of blocking the angiotensin II type I receptor (AT1R) on the hypertrophy response of elderly human skeletal muscle to four months of heavy resistance exercise training. METHODS: 58 healthy elderly men (+65 years) were randomized into three groups, consuming either AT1R blocker (losartan, 100mg/day) or placebo for 4 months. Two groups performed resistance training (RT) and were treated with either losartan or placebo and one group did not train but was treated with losartan...
August 9, 2018: Journal of Applied Physiology
Jong-Chi Oh, Jae-Sung Kwon
OBJECTIVE: The effect of a resistive jaw-opening exercise using an elastic band on suprahyoid muscle activity and tongue strength was examined in healthy volunteers. METHODS: Twenty-one adults wore an elastic loop around their head and mandible. To prescribe the appropriate elastic band resistance, the 10-repetition maximum (10 RM) was measured among 4 bands at baseline. Band loops, starting with the highest resistance value band, were sequentially applied to determine the suitability for 10 RM...
August 8, 2018: Folia Phoniatrica et Logopaedica
Tingrui Lin, Mengni Shi, Furong Huang, Jing Peng, Qingwen Bai, Jiuqiang Li, Maolin Zhai
High-performance hydrogel electrolytes play a crucial role in flexible supercapacitors (SCs). However, the unsatisfactory mechanical properties of widely-used polyvinyl alcohol-based electrolytes greatly limit their use in the flexible SCs. Here a novel Li2 SO4 -containing agarose/polyacrylamide double-network (Li-AG/PAM DN) hydrogel electrolyte was synthesized by a heating-cooling and subsequent radiation-induced polymerization and crosslinking process. The Li-AG/PAM DN hydrogel electrolyte possesses extremely excellent mechanical properties with a compression strength of 150 MPa, a fracture compression strain of above 99...
August 8, 2018: ACS Applied Materials & Interfaces
Tatyane Ribeiro Mesquita, Lídia Parsekian Martins, Renato Parsekian Martins
OBJECTIVE: To identify the appropriate power level for electric welding of three commercial brands of nickel-titanium (NiTi) wires. METHODS: Ninety pairs of 0.018-in and 0.017 × 0.025-in NiTi wires were divided into three groups according to their manufacturers - GI (Orthometric, Marília, Brazil), GII (3M OralCare, St. Paul, CA) and GIII (GAC,York, PA) - and welded by electrical resistance. Each group was divided into subgroups of 5 pairs of wires, in which welding was done with different power levels...
May 2018: Dental Press Journal of Orthodontics
Jesús María Aranaz Andrés, Alberto Pardo Hernández, Patricia López Pereira, José Lorenzo Valencia-Martín, Cristina Diaz-Agero Pérez, Nieves López Fresneña, Ángela Rincón Carlavilla, María Teresa Gea-Velázquez de Castro, Cristina Navarro Royo, Carmen Albéniz Lizárraga, Abelardo Claudio Fernández Chávez
OBJECTIVE: The patient safety culture (PSC) in health institutions depends on various organizational and human factors. Our aim was to evaluate, as a teaching strategy, the knowledge in patient safety and perceptions about the PSC. METHODS: A convenience sample, with 122 health professionals from Regional Minister of Health's patient safety courses attendees in 2015. Be- fore each course, were delivered a knowledge questionnaire about patient safety (own elaboration) and a validated PSC questionnaire (estimating 3 dimensions: managerial support, perception of safety and expectations / actions)...
August 8, 2018: Revista Española de Salud Pública
Kristen M Beavers, Michael P Walkup, Ashley A Weaver, Leon Lenchik, Stephen B Kritchevsky, Barbara J Nicklas, Walter T Ambrosius, Joel D Stitzel, Thomas C Register, Sue A Shapses, Anthony P Marsh, W Jack Rejeski
The objective of this study was to determine the ability of either aerobic or resistance training to counter weight-loss-associated bone loss in older adults. There were 187 older adults (67 years, 70% women, 64% white) with obesity (BMI = 34.5 ± 3.7 kg/m2 ) and cardiovascular disease and/or metabolic syndrome who were randomized to participate in an 18-month, community-based trial, with a follow-up assessment at 30 months. Intervention arms included: weight loss alone (WL; 7% to 10% baseline weight), WL plus aerobic training (WL + AT), and WL plus resistance training (WL + RT), as well as DXA-acquired total hip, femoral neck, and lumbar spine areal bone mineral density (aBMD), and trabecular bone score (TBS)...
August 7, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
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