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https://www.readbyqxmd.com/read/28530478/validity-of-a-linear-velocity-transducer-for-testing-maximum-vertical-jumps
#1
Alejandro Pérez-Castilla, Belén Feriche, Slobodan Jaric, Paulino Padial, Amador García-Ramos
This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60 and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28527424/influence-of-chronic-stretching-on-muscle-performance-systematic-review
#2
D M Medeiros, C S Lima
The aim of the current study was to investigate the influence of chronic stretching on muscle performance (MP) by a systematic review. The search strategy included MEDLINE, PEDro, Cochrane CENTRAL, LILACS, and manual search from inception to June 2016. Randomized and controlled clinical trials, non-randomized, and single group studies that have analyzed the influence of flexibility training (FT) (using any stretching technique) on MP were included. Differently, studies with special populations (children, elderly, and people with any dysfunction/disease), and articles that have used FT protocols shorter than three weeks or 12 sessions were excluded...
May 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28526219/cardiorespiratory-fitness-and-muscular-strength-as-mediators-of-the-influence-of-fatness-on-academic-achievement
#3
Antonio García-Hermoso, Irene Esteban-Cornejo, Jordi Olloquequi, Robinson Ramírez-Vélez
OBJECTIVE: To examine the combined association of fatness and physical fitness components (cardiorespiratory fitness [CRF] and muscular strength) with academic achievement, and to determine whether CRF and muscular strength are mediators of the association between fatness and academic achievement in a nationally representative sample of adolescents from Chile. STUDY DESIGN: Data were obtained for a sample of 36 870 adolescents (mean age, 13.8 years; 55.2% boys) from the Chilean System for the Assessment of Educational Quality test for eighth grade in 2011, 2013, and 2014...
May 16, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28525338/different-training-schedules-influence-platelet-aggregation-in-show-jumping-horses
#4
C Giannetto, F Arfuso, F Fazio, E Giudice, S Di Pietro, D Bruschetta, G Piccione
Depending on the intensity, duration and type of physical exercise, equine metabolism has to adapt to nervous, cardiovascular, endocrine and respiratory system requirements. In horses, exercise and training are known to have considerable effects on the mechanisms of hemostatic system involving platelet activity. The aim of the present study was to evaluate the effect of different training schedules on platelet aggregation in 15 Italian Saddle jumping horses. Animals were divided into three equal groups: Group A was subjected to a high intensity-training program; group B to a light training program, group C included sedentary horses...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28522976/trunk-muscle-activity-during-drop-jump-performance-in-adolescent-athletes-with-back-pain
#5
Steffen Mueller, Josefine Stoll, Juliane Mueller, Michael Cassel, Frank Mayer
In the context of back pain, great emphasis has been placed on the importance of trunk stability, especially in situations requiring compensation of repetitive, intense loading induced during high-performance activities, e.g., jumping or landing. This study aims to evaluate trunk muscle activity during drop jump in adolescent athletes with back pain (BP) compared to athletes without back pain (NBP). Eleven adolescent athletes suffering back pain (BP: m/f: n = 4/7; 15.9 ± 1.3 y; 176 ± 11 cm; 68 ± 11 kg; 12...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28515975/prospective-functional-performance-testing-and-relationship-to-lower-extremity-injury-incidence-in-adolescent-sports-participants
#6
Joseph Smith, Nick DePhillipo, Iris Kimura, Morgan Kocher, Ronald Hetzler
BACKGROUND: Due to the high number of adolescent athletes and subsequent lower extremity injuries, improvements of injury prevention strategies with emphasis on clinic-based and practical assessments are warranted. PURPOSE: The purpose of this study was to prospectively investigate if a battery of functional performance tests (FPT) could be used as a preseason-screening tool to identify adolescent athletes at risk for sports-related acute lower extremity injury via comparison of injured and uninjured subjects...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515835/the-effect-of-acute-hyperglycemia-on-muscular-strength-power-and-endurance
#7
Franklin Lime-Ma, Joshua A Cotter, Evan E Schick
The purpose of this study was to elucidate the impact of acute hyperglycemia on skeletal muscle strength, power, and endurance. Ten male collegiate athletes (age 21.5 ± 1.5 years, height 186 ± 2.03 cm, body mass 108.8 ± 7.6 kg) participated in 2 testing sessions, separated by 7 days and randomized for either high glucose (HG) or control (C) treatment conditions. HG consumed a high glucose drink (2 g glucose/kg body weight) while controls consumed an isocaloric nutrition bar (40% protein, 30% fat, and 30% carbohydrate)...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28515832/a-low-dose-caffeine-and-carbohydrate-supplement-does-not-improve-athletic-performance-during-volleyball-competition
#8
David R Pfeifer, Kelsey M Arvin, Courtney N Herschberger, Nicholas J Haynes, Matthew S Renfrow
Dietary supplements are widely used to enhance sport performance and the combination of carbohydrate and caffeine (CHO+CAF) has yielded particularly high performance gains. Though the effects of a CHO+CAF supplement have been studied in a laboratory environment, little research exists on the effects of supplementation during competition. Therefore, the purpose of this study was to determine the effects of a CHO+CAF supplement on athletic performance in competition. Eight female collegiate volleyball players completed three testing sessions under three different conditions separated by approximately one week each: CHO+CAF supplement, placebo (PBO), and control (CTL) using a randomized, cross-over design...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28512571/mechanochemical-synthesis-of-n-salicylidene-aniline-thermosalient-effect-of-polymorphic-crystals
#9
Sudhir Mittapalli, D Sravanakumar Perumalla, Ashwini Nangia
Polymorphs of the dichloro derivative of N-salicylideneaniline exhibit mechanical responses such as jumping (Forms I and III) and exploding (Form II) in its three polymorphs. The molecules are connected via the amide N-H⋯O dimer synthon and C-Cl⋯O halogen bond in the three crystal structures. A fourth high-temperature Form IV was confirmed by variable-temperature single-crystal X-ray diffraction at 180°C. The behaviour of jumping exhibited by the polymorphic crystals of Forms I and III is due to the layered sheet morphology and the transmission of thermal stress in a single direction, compared with the corrugated sheet structure of Form II such that heat dissipation is more isotropic causing blasting...
May 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/28500647/serum-bdnf-and-il-6-response-to-high-volume-mechanically-demanding-exercise
#10
Vaidas Verbickas, Sigitas Kamandulis, Audrius Snieckus, Tomas Venckunas, Neringa Baranauskiene, Marius Brazaitis, Danguole Satkunskiene, Alvydas Unikauskas, Albertas Skurvydas
INTRODUCTION: The aim of this study was to follow circulating brain-derived neurotrophic factor (BDNF) and interleukin 6 (IL-6) levels in response to severe muscle-damaging exercise. METHODS: Young healthy men (N=10) performed a bout of mechanically demanding stretch shortening cycle exercise consisting of 200 drop jumps. Voluntary and electrically induced knee extension torque, serum BDNF levels, and IL-6 levels were measured before and for up to 7 days after exercise...
May 13, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28491122/in-situ-measurement-of-scots-pine-needle-pri
#11
Matti Mõttus, Rocío Hernández-Clemente, Viljami Perheentupa, Vincent Markiet
BACKGROUND: The Photochemical Reflectance Index (PRI) calculated from narrow-band spectral reflectance data is a vegetation index which is increasingly used as an indicator of photosynthetic activity. The leaf-level link between the status of photosynthetic apparatus and PRI has been robustly established under controlled light conditions. However, when a whole canopy is measured instantaneously, the PRI signal is heavily modified by vegetation structure and local variations in incident light conditions...
2017: Plant Methods
https://www.readbyqxmd.com/read/28488829/analyzing-the-relationship-between-anthropometric-and-motor-indices-with-basketball-specific-pre-planned-and-non-planned-agility-performances
#12
Miran Pehar, Nedim Sisic, Damir Sekulic, Milan Coh, Ognjen Uljevic, Miodrag Spasic, Ante Krolo, Kemal Idrizovic
BACKGROUND: Although agility is an important quality in basketball, factors associated with basketball specific pre-planned-agility (change-of-direction-speed - CODS) and non- planned-agility (reactive agility - RA) are rarely investigated. The aim of this study was to evaluate relationship between anthropometric and motor indices with basketball-specific CODS and RA in male basketball players of high performance level. METHODS: We tested 88 high-level male basketball players (height: 194...
May 9, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28484752/doped-%C3%AE-bismuth-oxides-to-investigate-oxygen-ion-transport-as-a-metric-for-condensed-phase-thermite-ignition
#13
Xizheng Wang, Wenbo Zhou, Jeffery B DeLisio, Garth C Egan, Michael R Zachariah
Nanothermites offer high energy density and high burn rates, but are mechanistically only now being understood. One question of interest is how initiation occurs and how the ignition temperature is related to microscopic controlling parameters. In this study, we explored the potential role of oxygen ion transport in Bi2O3 as a controlling mechanism for condensed phase ignition reaction. Seven different doped δ-Bi2O3 were synthesized by aerosol spray pyrolysis. The ignition temperatures of Al/doped Bi2O3, C/doped Bi2O3 and Ta/doped Bi2O3 were measured by temperature-jump/time-of-flight mass spectrometer coupled with a high-speed camera respectively...
May 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28475036/determinants-of-host-species-range-in-plant-viruses
#14
Benoît Moury, Frédéric Fabre, Eugénie Hébrard, Rémy Froissart
Prediction of pathogen emergence is an important field of research, both in human health and in agronomy. Most studies of pathogen emergence have focused on the ecological or anthropic factors involved rather than on the role of intrinsic pathogen properties. The capacity of pathogens to infect a large set of host species, i.e. to possess a large host range breadth (HRB), is tightly linked to their emergence propensity. Using an extensive plant virus database, we found that four traits related to virus genome or transmission properties were strongly and robustly linked to virus HRB...
April 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28474730/three-dimensional-kinematics-of-the-equine-metacarpophalangeal-joint-using-x-ray-reconstruction-of-moving-morphology-a-pilot-study
#15
Bronwen A Childs, Brenna R Pugliese, Cristina T Carballo, Daniel L Miranda, Elizabeth L Brainerd, Carl A Kirker-Head
X-ray reconstruction of moving morphology (XROMM) uses biplanar videoradiography and computed tomography (CT) scanning to capture three-dimensional (3D) bone motion. In XROMM, morphologically accurate 3D bone models derived from CT are animated with motion from videoradiography, yielding a highly accurate and precise reconstruction of skeletal kinematics. We employ this motion analysis technique to characterize metacarpophalangeal joint (MCPJ) motion in the absence and presence of protective legwear in a healthy pony...
May 5, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28474729/utilizing-electronic-medical-records-to-discover-changing-trends-of-medical-behaviors-over-time
#16
Liangying Yin, Zhengxing Huang, Wei Dong, Chunhua He, Huilong Duan
OBJECTIVES: Medical behaviors are playing significant roles in the delivery of high quality and cost-effective health services. Timely discovery of changing frequencies of medical behaviors is beneficial for the improvement of health services. The main objective of this work is to discover the changing trends of medical behaviors over time. METHODS: This study proposes a two-steps approach to detect essential changing patterns of medical behaviors from Electronic Medical Records (EMRs)...
May 5, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28473996/return-to-sport-in-the-younger-patient-with-anterior-cruciate-ligament-reconstruction
#17
Kate E Webster, Julian A Feller, Timothy S Whitehead, Gregory D Myer, Peter B Merory
BACKGROUND: Although anterior cruciate ligament (ACL) reconstruction is generally regarded as a successful procedure, only 65% of patients return to their preinjury sport. While return-to-sport rates are likely higher in younger patients, there is a paucity of data that focus on the younger patient and their return-to-sport experience after ACL reconstruction. PURPOSE: To investigate a range of return-to-sport outcomes in younger athletes who had undergone ACL reconstruction surgery...
April 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28471700/relationship-between-the-practice-of-physical-activity-and-quality-of-movement-in-adolescents-a-screening-tool-using-self-organizing-maps
#18
María Herrero-Herrero, Xavier García-Massó, Carlos Martínez-Corralo, Josep Prades-Piñón, Vicente Sanchis-Alfonso
OBJECTIVES: The aim of this study was to determine whether the most physically active adolescents have better lower limb control. METHODS: 31 high school students (12 males and 19 females) participated in this study. The Anterior Knee Pain Scale was used to find any cases of knee pain. Only subjects with high scores were selected, to exclude those with knee pain or lower limb injuries. Single Leg Squat and Tuck Jump Assessment were used to evaluate movements with two cameras in a two-dimensional assessment...
May 12, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28471184/deficiencies-in-molecular-dynamics-simulation-based-prediction-of-protein-dna-binding-free-energy-landscapes
#19
Morteza Khabiri, Peter L Freddolino
Transcriptional regulation allows cells to match their gene expression profiles to their current requirements based on environment, cellular physiological state, and extracellular signals. DNA binding transcription factors are major agents of transcriptional regulation, and bind to DNA with a factor-specific sequence preference to exert regulatory effects. A crucial step in unraveling the logic of a regulatory network is determining the sequence-specific binding affinity landscapes for the transcription factors in it...
May 4, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28469759/factors-determining-success-in-youth-judokas
#20
Goran Kuvačić, Saša Krstulović, Petra Đapić Caput
The aim of this study was to compare two models of determining factors for success in judo. The first model (Model A) included testing motor abilities of high-level Croatian judokas in the cadet age category. The sample in Model A consisted of 71 male and female judokas aged 16 ± 0.6 years who were divided into four subsamples according to sex and weight category. The second model (Model B) consisted of interviewing 40 top-level judo experts on the importance of motor abilities for cadets' success in judo...
February 2017: Journal of Human Kinetics
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