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https://www.readbyqxmd.com/read/29241149/a-novel-use-of-3d-printing-model-demonstrates-the-effects-of-deteriorated-trabecular-bone-structure-on-bone-stiffness-and-strength
#1
Meir Max Barak, Margaret Arielle Black
Trabecular bone structure is crucial to normal mechanical behavior of bones. Studies have shown that osteoporosis negatively affects trabecular bone structure, mainly by reducing bone volume fraction (BV/TV) and thus increasing fracture risk. One major limitation in assessing and quantifying the effect of this structural deterioration is that no two trabecular structures are identical. Thus, when we compare a group of healthy bones against a different group of bones that experienced resorption (i.e. decreased BV/TV) we only discover an "average" mechanical effect...
December 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29241091/the-effectiveness-of-group-otago-exercise-program-on-physical-function-in-nursing-home-residents-older-than-65years-a-randomized-controlled-trial
#2
Mirjana Kocic, Zorica Stojanovic, Dejan Nikolic, Milica Lazovic, Rade Grbic, Lidija Dimitrijevic, Marina Milenkovic
AIM: To examine whether the 6-months group-based Otago exercise program is more effective than usual care on physical function and functional independence in nursing home residents older than 65 years. METHODS: An observer-blind randomized controlled study included 77 independently walking, cognitively unimpaired residents aged 78.4±7.6years, of which 66.2% were female. Physical function was assessed at baseline, after 3 and 6months of the Otago exercise program by three performance tests: Berg Balance Scale (BBS), Timed Up and Go (TUG) and Chair Rising Test (CRT), and functional independence by the motor Functional Independence Measure (mFIM)...
December 10, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/29240341/finland-establishing-the-internet-of-genomics-and-health-data
#3
Aarno Palotie, Samuli Ripatti
Genomic data, i.e. measurement of variation in the complete genome has revolutionized genetic research and changed our understanding of the pathogenetic mechanisms of diseases. Genomic data in combination with Finnish special strengths - population history, the nation's comprehensive health records and a strong research tradition in genetic epidemiology - has made Finland a testing laboratory for diseases of public health importance. At the same time, genomic research has changed into statistical evaluation of large masses of data - big data...
2017: Duodecim; Lääketieteellinen Aikakauskirja
https://www.readbyqxmd.com/read/29239998/seasonal-changes-in-functional-fitness-and-neurocognitive-assessments-in-youth-ice-hockey-players
#4
Michelle Avery, Nick Wattie, Michael Holmes, Shilpa Dogra
Deficits in balance and strength combined with differing rates of sensory and motor neural development may increase risk of sports related injury in youth. This study evaluated changes in functional fitness and concussion status over the course of a competitive season in youth ice-hockey players, and examined the relationship between these variables and injury occurrence. Thirty-six participants (8.9 ± 1.1 years) completed pre and post-season assessments including anthropometric measurements, the Functional Movement Screen (FMS), Lower Quarter Y-Balance Test (YBT-LQ), and a computerized neurocognitive assessment (ImPACT)...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239991/a-multiple-repeated-sprint-ability-test-with-four-changes-of-direction-for-badminton-players-part-2-predicting-skill-level-with-anthropometry-strength-shuttlecock-and-displacement-velocity
#5
Michael Phomsoupha, Guillaume Laffaye
The goal of this study was: (i) to assess general and specific lower and upper limb force, shuttlecock velocity, displacement ability and the anthropometric characteristics of badminton players at five skill levels, and (ii) to predict individual players' number of points. We divided 83 participants into groups of novice (n=15), intermediate (n=16), skilled (n=23), highly skilled (n=14) and elite (n=15) players. The number of points scored for each player performing tournaments (excluding novices) during the entire season was used as a continuous and dependent variable after logarithmic transformation for correlational study...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239989/a-systematic-review-of-the-association-between-physical-fitness-and-musculoskeletal-injury-risk-part-3-flexibility-power-speed-balance-and-agility
#6
Sarah J de la Motte, Peter Lisman, Timothy C Gribbin, Kaitlin Murphy, Patricia A Deuster
We performed a systematic review and evaluation of the existing scientific literature on the association between flexibility, power, speed, balance, and agility, and musculoskeletal injury (MSK-I) risk in military and civilian populations. MEDLINE, EBSCO, EMBASE, and the Defense Technical Information Center were searched for original studies published from 1970 through 2015 that examined associations between these physical fitness measures (flexibility, power, speed, balance, and agility) and MSK-I. Methodological quality and strength of the evidence were determined following criteria adapted from previously published systematic reviews...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239987/body-composition-of-women-s-ice-hockey-players-comparison-of-estimates-using-skinfolds-and-idxa
#7
Kajsa Gilenstam, Christina A Geithner
The purpose of this study was to compare percent fat (% Fat) estimates from anthropometric equations using skinfolds (SKF) in women's ice hockey players to estimates obtained from Lunar iDXA. Data were collected on 19 elite female Swedish hockey players (mean age ± SD = 18.4 ± 2.4 y). Four skinfolds (SKF) (triceps, abdominal, suprailiac, and thigh) were measured within two hours of iDXA assessments. The % Fat estimates from iDXA and four anthropometric equations were compared using paired t-tests, and a one-way ANOVA was used to compare % Fat estimates from the anthropometric equations...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239712/multiparametric-mr-imaging-of-age-related-changes-in-healthy-thigh-muscles
#8
Min A Yoon, Suk-Joo Hong, Min Cheol Ku, Chang Ho Kang, Kyung-Sik Ahn, Baek Hyun Kim
Purpose To use multiparametric magnetic resonance (MR) imaging to assess for and establish age-related differences in healthy thigh muscles. Materials and Methods Ninety-five subjects (47 men, 48 women; median age, 47 years) with healthy body mass index were grouped according to age: 30-39 years (n = 25), 40-49 years (n = 25), 50-59 years (n = 25), and 60-69 years (n = 20). Multiparametric MR imaging (intravoxel incoherent motion diffusion-weighted, diffusion-tensor, multiecho Dixon, and dynamic contrast material-enhanced MR imaging) was performed at 3...
December 14, 2017: Radiology
https://www.readbyqxmd.com/read/29239451/metal-polymer-interface-influences-apparent-electrical-properties-of-nano-structured-polyaniline-films
#9
John R Aggas, William Harrell, Jodie Lutkenhaus, Anthony Guiseppi-Elie
The interface between the conductive polymer, polyaniline (PAn-Cl), and gold, platinum, or an interceding layer of electrodeposited platinum on gold or platinum, markedly influences the apparent electrical properties and the electronic to ionic transition in physiological buffers. Polyester-supported, sputter-deposited gold and platinum thin films were laser patterned to yield co-planar Thin Film Electrodes (TFEs) suitable for platinization and deposition of PAn-Cl nanofibers. Electrodeposition of platinum from chloroplatinic acid (50 mC cm-2) onto gold produced larger feature sizes and larger surface roughness (23...
December 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29239103/out-of-plane-3d-printed-microfibers-improve-the-shear-properties-of-hydrogel-composites
#10
Mylène de Ruijter, Andrei Hrynevich, Jodie N Haigh, Gernot Hochleitner, Miguel Castilho, Jürgen Groll, Jos Malda, Paul D Dalton
One challenge in biofabrication is to fabricate a matrix that is soft enough to elicit optimal cell behavior while possessing the strength required to withstand the mechanical load that the matrix is subjected to once implanted in the body. Here, melt electrowriting (MEW) is used to direct-write poly(ε-caprolactone) fibers "out-of-plane" by design. These out-of-plane fibers are specifically intended to stabilize an existing structure and subsequently improve the shear modulus of hydrogel-fiber composites. The stabilizing fibers (diameter = 13...
December 14, 2017: Small
https://www.readbyqxmd.com/read/29239067/optical-and-mechanical-properties-of-newly-developed-monolithic-multilayer-zirconia
#11
Shaymaa E Elsaka
PURPOSE: To evaluate the optical and mechanical properties of newly introduced monolithic multilayer zirconia with two types of monolithic zirconia. MATERIALS AND METHODS: Three brands of monolithic zirconia were used in this study: Ceramill Zolid FX Multilayer (CZF), Prettau Anterior (PA), and Zenostar T (ZT). Translucency parameter (TP), contrast ratio (CR), flexural strength, fracture toughness, hardness, brittleness index, and microstructures were assessed. Data were analyzed using one-way ANOVA and Tukey's test...
December 14, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29239030/neuromuscular-training-reduces-lower-limb-injuries-in-elite-female-basketball-players-a-cluster-randomized-controlled-trial
#12
Matteo Bonato, Roberto Benis, Antonio La Torre
The study was a two-armed, parallel group, cluster randomized controlled trial in which 15 teams (160 players) were assigned to either an experimental group (EG, 8 teams n=86), which warmed-up with bodyweight neuromuscular exercises, or a control group (CG, 7 teams, n=74) that performed standard tactical-technical exercises before training. All injuries during the 2015-2016 regular season were counted. Epidemiologic incidence proportion and incidence rate, were also calculated. Counter movement jump (CMJ) and composite Y-Excursion balance test (YBT) were used to assess lower limb strength, and postural control...
December 14, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29238970/the-consequences-of-sexual-selection-in-well-adapted-and-maladapted-populations-of-bean-beetles
#13
Ivain Martinossi-Allibert, Uroš Savković, Mirko Đorđević, Göran Arnqvist, Biljana Stojković, David Berger
Whether sexual selection generally promotes or impedes population persistence remains an open question. Intralocus sexual conflict (IaSC) can render sexual selection in males detrimental to the population by increasing the frequency of alleles with positive effects on male reproductive success but negative effects on female fecundity. Recent modelling based on fitness landscape theory, however, indicates that the relative impact of IaSC may be reduced in maladapted populations and that sexual selection therefore might promote adaptation when it is most needed...
December 14, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/29238597/effects-of-nine-weeks-isokinetic-training-on-power-golf-kinematics-and-driver-performance-in-pre-elite-golfers
#14
James Parker, Charlie Lagerhem, John Hellström, M Charlotte Olsson
Background: It has previously been shown that isotonic strength training can improve driver performance among golfers, though few studies have investigated effects of strength training on swing kinematics together with driver performance. In this study we investigated whether isokinetic rotational training could improve driver performance and swing kinematic variables amongst elite golfers. Methods: Twenty competitive pre-elite golfers (handicap better than -3.0), 13 men and 7 women, were split into two groups, one group received the isokinetic power training (IK) alongside their normal isotonic pre-season strength-training and the other group continued with their normal isotonic pre-season strength-training regime (IT)...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29238488/effect-of-hydrofluoric-acid-surface-treatments-on-micro-shear-bond-strength-of-cad-cam-ceramics
#15
Faraneh Mokhtarpour, Homayoon Alaghehmand, Soraya Khafri
Introduction: Dental ceramics are appreciated as highly esthetic restorative materials that can simulate the appearance of natural dentition better than other materials. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on micro-shear bond strength (μSBS) to IPS e.max CAD and Vita Mark II of a dual cured resin cement (Panavia F2.0). Methods: This study was an experimental in vitro study, performed in the dental material research center of Babol University of Medical Sciences in 2016...
October 2017: Electronic Physician
https://www.readbyqxmd.com/read/29238472/vitamin-e-improved-bone-strength-and-bone-minerals-in-male-rats-given-alcohol
#16
Syuhada Zakaria, Siti-Zulaikha Mat-Husain, Kong Ying-Hwey, Kek Xin-Kai, Abdullah Mohd-Badawi, Nurul-Amiza Abd-Ghani, Muhamad-Arizi Aziz, Norazlina Mohamed
Objectives: Alcohol consumption induces oxidative stress on bone, which in turn increases the risk of osteoporosis. This study determined the effects of vitamin E on bone strength and bone mineral content in alcohol-induced osteoporotic rats. Materials and Methods: Three months old Sprague Dawley male rats were randomly divided into 5 groups: (I) control group; (II) alcohol (3g/kg) + normal saline; (III) alcohol (3g/kg) + olive oil; (IV) alcohol (3g/kg) + alpha-tocopherol (60mg/kg) and (V) alcohol (3g/kg) + palm vitamin E (60mg/kg)...
December 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29238259/front-crawl-swimming-performance-and-bi-lateral-force-asymmetry-during-land-based-and-tethered-swimming-tests
#17
Karini B Dos Santos, Paulo C Barauce Bento, Gleber Pereira, Carl Payton, André L F Rodacki
The aims of this study were to investigate whether land-based and tethered swimming strength tests can explain swimming performance in 200-meter front crawl and, whether these tests were able to identify bilateral symmetry in force production. In the first session, eighteen swimmers completed a maximum effort 200 m front crawl swim (swimming performance) and 15 seconds maximal effort tethered front crawl swim. In the second session, participants performed the upper extremity isometric strength test. Peak force production of tethered swimming and isometric strength tests were significantly correlated for the strongest and weakest sides (r = 0...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238246/preventive-and-regenerative-foam-rolling-are-equally-effective-in-reducing-fatigue-related-impairments-of-muscle-function-following-exercise
#18
Johannes Fleckenstein, Jan Wilke, Lutz Vogt, Winfried Banzer
Objectives of the study were to compare the effects of a single bout of preventive or regenerative foam rolling (FR) on exercise-induced neuromuscular exhaustion. Single-centre randomised-controlled study was designed. Forty-five healthy adults (22 female; 25±2 yrs) were allocated to three groups: 1) FR of the lower limb muscles prior to induction of fatigue, 2) FR after induction of fatigue, 3) no-treatment control. Neuromuscular exhaustion was provoked using a standardized and validated functional agility short-term fatigue protocol...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238244/influence-of-a-thermogenic-dietary-supplement-on-safety-markers-body-composition-energy-expenditure-muscular-performance-and-hormone-concentrations-a-randomized-placebo-controlled-double-blind-trial
#19
Grant M Tinsley, Stacie Urbina, Jacy Mullins, Jordan Outlaw, Sara Hayward, Matt Stone, Cliffa Foster, Colin Wilborn, Lem Taylor
Dietary supplementation is commonly employed by individuals seeking to improve body composition and exercise performance. The purpose of the present study was to examine the safety and effectiveness of a commercially available dietary supplement designed to promote thermogenesis and fat loss. In a randomized double-blind trial, participants were assigned to consume placebo or a multi-ingredient supplement containing caffeine, green tea extract, l-carnitine, evodiamine and other ingredients that purportedly enhance thermogenesis...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238187/hand-grip-endurance-test-relates-to-clinical-state-and-prognosis-in-copd-patients-better-than-6-minute-walk-test-distance
#20
Miroslav Kovarik, Vera Joskova, Anna Patkova, Vladimir Koblizek, Zdenek Zadak, Miloslav Hronek
Purpose: Patients with COPD present peripheral muscle dysfunction and atrophy, expressed as muscle strength and endurance reduction. The goal of this study was direct dynamometric assessment of hand grip endurance and strength in relation to the stage of disease, multidimensional predictors of mortality, and 6-minute walk test (6MWT). To the best of our knowledge, there has been no previous study determining these parameters. Patients and methods: In this observational study, 58 consecutive outpatients with stable COPD and 25 volunteers without respiratory problems were compared...
2017: International Journal of Chronic Obstructive Pulmonary Disease
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