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https://www.readbyqxmd.com/read/29788859/female-judo-athletes-physical-test-performances-are-unrelated-to-technical-tactical-competition-skills
#1
Rafael L Kons, Juliano Dal Pupo, Jonathan Ache-Dias, Daniele Detanico
This study analyzed the relationship between generic and judo-specific physical test performances and technical-tactical competition performances among 19 female judo athletes. Participant data were gathered in two stages: (a) physical tests-countermovement jump (CMJ), handgrip strength, Special Judo Fitness Test and Judogi Grip Strength Test; and (b) match performances recorded for technical-tactical analysis. Pearson's linear correlation and multiple linear regression analysis showed no significant correlations between any technical-tactical parameter and judo-specific physical tests...
January 1, 2018: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29776029/actin-filaments-growing-against-an-elastic-membrane-effect-of-membrane-tension
#2
Raj Kumar Sadhu, Sakuntala Chatterjee
We study the force generation by a set of parallel actin filaments growing against an elastic membrane. The elastic membrane tries to stay flat and any deformation from this flat state, either caused by thermal fluctuations or due to protrusive polymerization force exerted by the filaments, costs energy. We study two lattice models to describe the membrane dynamics. In one case, the energy cost is assumed to be proportional to the absolute magnitude of the height gradient (gradient model) and in the other case it is proportional to the square of the height gradient (Gaussian model)...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29769822/maturity-status-strongly-influences-the-relative-age-effect-in-international-elite-under-9-soccer
#3
Lisa Müller, Josef Gehmaier, Christoph Gonaus, Christian Raschner, Erich Müller
The aim of the study was to assess the role of the relative age effect (RAE) and to investigate the influence of the biological maturity status on the RAE in international under-9 soccer. The birth dates of 222 male participants of the U9 Eurochampionship Soccer Tournament in Vienna in 2016 were analyzed and divided into four relative age quarters (Q1-Q4) and the biological maturity status was assessed with the age at peak height velocity (APHV) method. Based on the mean±standard deviation of the APHV, the athletes were divided into three groups of maturity: early, normal and late maturing...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29742747/improving-the-signal-to-noise-ratio-when-monitoring-countermovement-jump-performance
#4
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Improving the signal-to-noise ratio when monitoring countermovement jump performance. J Strength Cond Res XX(X): 000-000, 2018-Countermovement jump (CMJ) performance has been routinely used to monitor neuromuscular status. However, the protocol used to establish the criterion score is not well documented. The purpose of this study was to examine how the protocol used would influence of the sensitivity of CMJ variables in rugby union players. Fifteen male (age: 19.7 ± 0.5 years) rugby union players performed 8 CMJs on 2 occasions, separated by 7 days...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29733264/head-impacts-and-cognitive-performance-in-men-s-lacrosse
#5
Erin Renee Marchesseault, Daniel Nguyen, Lee Spahr, Caroline Beals, Brian Razak, John M Rosene
OBJECTIVES: The purpose of this investigation was to record head impacts and assess cognitive function throughout a NCAA Division III men's lacrosse season. METHODS: Fifteen NCAA Div III men's lacrosse players (age = 21.1 ± 1.5 years; height = 179 ± 7.00cm; weight = 80.74 ± 8.00kg) wore Smart Impact Monitors (SIM) (Triax Technologies, Inc., Norwalk, CT) within headbands, in 28 practices and 9 home games of one season. The SIM devices communicated with the Triax Technologies SKYi, which confirmed activated SIMs and obtained data of linear acceleration, rotational acceleration, rotational velocity, direction, and location of each head impact...
May 7, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29730657/adolescent-undernutrition-global-burden-physiology-and-nutritional-risks
#6
Parul Christian, Emily R Smith
Adolescents, comprised of 10-19 year olds, form the largest generation of young people in our history. There are an estimated 1.8 billion adolescents in the world, with 90% residing in low- and middle-income countries. The burden of disease among adolescents has its origins in infectious and injury-related causes, but nutritional deficiencies, suboptimal linear growth, and undernutrition are major public health problems, even as overweight may be on the rise in many contexts. Summary and Key Messages: Girls are most vulnerable to the influences of cultural and gender norms, which often discriminate against them...
May 4, 2018: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/29721430/triboelectric-based-transparent-secret-code
#7
Zuqing Yuan, Xinyu Du, Nianwu Li, Yingying Yin, Ran Cao, Xiuling Zhang, Shuyu Zhao, Huidan Niu, Tao Jiang, Weihua Xu, Zhong Lin Wang, Congju Li
Private and security information for personal identification requires an encrypted tool to extend communication channels between human and machine through a convenient and secure method. Here, a triboelectric-based transparent secret code (TSC) that enables self-powered sensing and information identification simultaneously in a rapid process method is reported. The transparent and hydrophobic TSC can be conformed to any cambered surface due to its high flexibility, which extends the application scenarios greatly...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29713250/effects-of-%C3%AE-alanine-supplementation-during-a-5-week-strength-training-program-a-randomized-controlled-study
#8
José Luis Maté-Muñoz, Juan H Lougedo, Manuel V Garnacho-Castaño, Pablo Veiga-Herreros, María Del Carmen Lozano-Estevan, Pablo García-Fernández, Fernando de Jesús, Jesús Guodemar-Pérez, Alejandro F San Juan, Raúl Domínguez
Background: β-Alanine (BA) is a non-essential amino acid that has been shown to enhance exercise performance. The purpose of this investigation was to determine if BA supplementation improved the adaptive response to five weeks of a resistance training program. Methods: Thirty healthy, strength-trained individuals were randomly assigned to the experimental groups placebo (PLA) or BA. Over 5 weeks of strength training, subjects in BA took 6.4 g/day of BA as 8 × 800 mg doses each at least 1...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29695189/a-multidimensional-approach-to-talent-identification-and-selection-in-high-level-youth-australian-football-players
#9
Rhys Tribolet, Kyle J M Bennett, Mark L Watsford, Job Fransen
There is limited research in talent identification in youth Australian Football (AF), especially the factors that underpin selection into higher-level development programs. Therefore, this study explored age-related differences in high-level youth AF players and investigated characteristics influencing selection into a high-level development program. Anthropometry (stature, sitting height, body mass), maturity (estimated age at peak height velocity), motor competence (Körperkoordinationstest für Kinder), fitness (change of direction speed, lower body power and upper body muscular endurance) and coach skill ratings (kicking, marking and handballing) of 277 state academy players (U13-U15) were assessed...
April 26, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29693423/landing-kinematics-in-elite-male-youth-soccer-players-of-different-chronologic-age-and-stage-of-maturation
#10
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
CONTEXT:   Despite the high frequency of knee injuries in athletes, few researchers have studied the effects of chronologic age and stage of maturation on knee-joint kinematics in male youth soccer players. OBJECTIVE:   To use a coach-friendly screening tool to examine knee-valgus scores for players of different ages and at different stages of maturation. DESIGN:   Cross-sectional study. SETTING:   Academy soccer clubs...
April 25, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29687783/subnormal-growth-velocity-and-related-factors-during-gnrh-analog-therapy-for-idiopathic-central-precocious-puberty
#11
Nursel Muratoğlu Şahin, Asiye Uğraş Dikmen, Semra Çetinkaya, Zehra Aycan
OBJECTIVE: Decline of subnormal growth velocity(GV) and related factors during gonadotropin-releasing hormone analog(GnRHa) therapy for idiopathic central precocious puberty(ICPP) are unclear. We investigated the incidence of subnormal growth velocity, associated factors in patients with GnRHa therapy for ICPP. METHODS: In this retrospective cohort study, the records of 50 girls were investigated, who had diagnosed ICPP and had started GnRHa treatment before the age of 8...
April 24, 2018: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/29680743/packing-characteristics-of-winged-shaped-polymer-fiber-supports-for-preparative-chromatography
#12
Johannes Winderl, Tamara Spies, Jürgen Hubbuch
Polymer fibers have been identified as a promising alternative support material for liquid chromatography. Area enhanced fibers may overcome the shortcomings of conventional fiber supports with respect to binding capacity and packing efficiency. One type of area enhanced fiber supports are winged shaped microfibers, which have a more than tenfold higher surface area than round fibers, and can be manufactured via inexpensive, conventional extrusion techniques. In the present study, the packing characteristics of native and grafted winged shaped fiber supports have been investigated...
April 12, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29669435/optimal-design-for-longitudinal-studies-to-estimate-pubertal-height-growth-in-individuals
#13
Tim James Cole
BACKGROUND: The SITAR model expresses individual pubertal height growth in terms of mean size, peak height velocity (PHV) and age at PHV. AIM: To use SITAR to identify the optimal time interval between measurements to summarise individual pubertal height growth. SUBJECTS AND METHODS: Heights in 3172 boys aged 9-19 years from Christ's Hospital School measured on 128 679 occasions (a median of 42 heights per boy) were analysed using the SITAR (SuperImposition by Translation And Rotation) mixed effects growth curve model, which estimates a mean curve and three subject-specific random effects...
April 18, 2018: Annals of Human Biology
https://www.readbyqxmd.com/read/29662267/decrement-in-bone-mineral-density-after-parathyroidectomy-in-a-pediatric-patient-with-primary-hyperparathyroidism
#14
Hidechika Morimoto, Hisakazu Nakajima, Jun Mori, Shota Fukuhara, Keiichi Shigehara, Shinsuke Adachi, Hajime Hosoi
Primary hyperparathyroidism (PHT) causes increased bone turnover, leading to reduction in bone mineral density (BMD). Parathyroidectomy is a definitive therapy and improves BMD in adult patients with PHT. However, there are no reports regarding alterations of BMD in pediatric or adolescent patients with PHT. Here, we report a case of a 13-yr-old boy with PHT who was referred to our institution for evaluation of hypercalcemia and hyperparathyroidism. Radiological investigation revealed an ectopic parathyroid adenoma below the right thyroid lobe...
2018: Clinical Pediatric Endocrinology: Case Reports and Clinical Investigations: Official Journal of the Japanese Society for Pediatric Endocrinology
https://www.readbyqxmd.com/read/29658521/ratios-of-torques-of-antagonist-muscle-groups-in-female-soccer-players
#15
Artur Struzik, Adam Siemieński, Tadeusz Bober, Bogdan Pietraszewski
PURPOSE: An increase in the value of the hamstring-to-quadriceps (H/Q) ratio with an increase in angular velocity may effectively prevent injuries of the back of the thigh. Previous studies have found that the conventional H/Q ratio was unaltered along with an increasing angular velocity in females. Therefore, this study aimed to investigate the relationships between the conventional H/Q ratio and angular velocity in a group of female soccer players. METHODS: The study was carried out on a group of 16 female soccer players (age: 20...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658150/proximal-patellar-tendon-pathology-can-develop-during-adolescence-in-young-ballet-dancers-a-2-year-longitudinal-study
#16
A Rudavsky, J L Cook, S Docking
PURPOSE: Patellar tendinopathy (tendon pain and dysfunction), or jumper's knee is prevalent in adult jumping athletes. Pathology in the proximal patellar tendon is a key risk factor for developing patellar tendinopathy. When pathology develops in the proximal patellar tendon is not known, though it is reported to exist in adolescent athletes. The aim of this study was to follow young jumping athletes (ballet dancers) through adolescence to identify if pathology develops and its relation to the adolescent growth spurt...
April 15, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29651893/differences-among-overhand-three-quarter-and-sidearm-pitching-biomechanics-in-professional-baseball-players
#17
Rafael F Escamilla, Jonathan S Slowik, Alek Z Diffendaffer, Glenn S Fleisig
The purpose of this study was to assess biomechanical differences among overhand, three-quarter, and sidearm arm-slot professional baseball pitchers. It was hypothesized that kinematic-and-kinetic differences would be found among the three groups, with sidearm pitchers demonstrating greater movement along the transverse plane, and overhead pitchers demonstrating greater movement along the sagittal plane. Based upon arm-slot-angle at ball-release, 30-overhand, 156-three-quarter, and 21-sidearm pitchers were tested using a 240-Hz-motion-analysis-system, and 37 kinematic-and-kinetic parameters were calculated...
April 13, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29611771/the-effects-of-maturation-on-jumping-ability-and-sprint-adaptations-to-plyometric-training-in-youth-soccer-players
#18
Abbas Asadi, Rodrigo Ramirez-Campillo, Hamid Arazi, Eduardo Sáez de Villarreal
The aim of this study was to investigate the effects of maturation on power and sprint performance adaptations following 6 weeks of plyometric training in youth soccer players during pre-season. Sixty male soccer players were categorized into 3 maturity groups (Pre, Mid and Post peak height velocity [PHV]) and then randomly assigned to plyometric group and control group. Vertical jump, standing long jump, and 20-m sprint (with and without ball) tests were collected before- and after-intervention. After the intervention, the Pre, Mid and Post-PHV groups showed significant (P ≤ 0...
April 3, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29599859/functional-movements-in-japanese-mini-basketball-players
#19
Kenji Kuzuhara, Masashi Shibata, Junta Iguchi, Ryo Uchida
Functional movement screen (FMS) has been used to establish normative data and determine potential injury risk for young adults and athletes, but there are few data in elementary school-age children. The purpose of this study was to establish fundamental values for the FMS in elementary school-age mini-basketball players. Secondary purposes were to examine relationships between functional movement patterns and age, peak height velocity (PHV), and body mass index (BMI), and to compare functional movement patterns between boys and girls and between individuals with and without a history of injury...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29580223/association-between-braced-curve-behavior-by-pubertal-growth-peak-and-bracing-effectiveness-in-female-idiopathic-scoliosis-a-longitudinal-cohort-study
#20
Sai-Hu Mao, Xu Sun, Ben-Long Shi, Yong Qiu, Bang-Ping Qian, Jack C Y Cheng
BACKGROUND: Pre-pubertal idiopathic scoliosis (IS) is associated with high risk of bracing ineffectiveness. Integrated multidimensional maturity assessments are useful but complex to predict the high-risk occurrence of curve progression. This study is designed to provide a simple screening method for brace effectiveness by determining whether or not the braced curve behavior at growth spurt, being defined as variations in Cobb angle velocity (AV) at peak height velocity (PHV), can be a new factor predictive of brace outcome prescribed before PHV...
March 27, 2018: BMC Musculoskeletal Disorders
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