keyword
MENU ▼
Read by QxMD icon Read
search

"Peak height velocity"

keyword
https://www.readbyqxmd.com/read/29769822/maturity-status-strongly-influences-the-relative-age-effect-in-international-elite-under-9-soccer
#1
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/29730657/adolescent-undernutrition-global-burden-physiology-and-nutritional-risks
#2
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/29695189/a-multidimensional-approach-to-talent-identification-and-selection-in-high-level-youth-australian-football-players
#3
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
#4
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/29669435/optimal-design-for-longitudinal-studies-to-estimate-pubertal-height-growth-in-individuals
#5
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
#6
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/29658150/proximal-patellar-tendon-pathology-can-develop-during-adolescence-in-young-ballet-dancers-a-2-year-longitudinal-study
#7
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/29611771/the-effects-of-maturation-on-jumping-ability-and-sprint-adaptations-to-plyometric-training-in-youth-soccer-players
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/29564304/track-and-field-practice-and-bone-outcomes-among-adolescents-a-pilot-study-abcd-growth-study
#11
Yuri da Silva Ventura Faustino-da-Silva, Ricardo Ribeiro Agostinete, André Oliveira Werneck, Santiago Maillane-Vanegas, Kyle Robinson Lynch, Isabella Neto Exupério, Igor Hideki Ito, Romulo Araújo Fernandes
Background: Osteoporosis is considered a public health problem with high worldwide prevalence. One approach to prevention is through the promotion of physical activity, especially exercise, during adolescence. Methods: This study compared bone variables in different body segments in adolescents according to participation in track and field. The study included 34 adolescents (22 boys), of whom 17 were track and field athletes and 17 were control subjects. Bone mineral density (BMD, g/cm2 ) and bone mineral content (BMC, g) were analyzed using dual energy X-ray absorptiometry (total body stratified by body segments)...
February 2018: Journal of Bone Metabolism
https://www.readbyqxmd.com/read/29547490/within-and-between-session-reliability-of-the-isometric-mid-thigh-pull-in-young-female-athletes
#12
Sylvia Moeskops, Jon L Oliver, Paul J Read, John B Cronin, Gregory D Myer, G Gregory Haff, Rhodri S Lloyd
To investigate the within- and between-session reliability of the isometric mid-thigh pull (IMTP) in pre- and post-peak height velocity (PHV) female athletes. Nineteen pre- and nineteen post-PHV athletes performed bilateral IMTPs using a custom-designed isometric testing system. Participants attended three separate testing-sessions, and performed three trials within each session. Peak force, relative peak force, force at 30, 50, 90, 100, 150, 200, and 250 milliseconds, rate of force development (RFD) within time-specific bands, time to peak force (TPF), and time to peak rate of force development (TPRFD) were obtained for analysis...
March 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29527927/acute-beetroot-juice-administration-improves-peak-isometric-force-production-in-adolescent-males
#13
David Bender, Jeremy R Townsend, William Vantrease, Autumn C Marshall, Ruth N Henry, Stephen Heffington, Kent D Johnson
The purpose of this study was to examine the effects of acute beetroot juice (BR) administration on repeated sprint performance and isometric force production in adolescent males. Twelve male adolescents (16.8 ± 1.0 yrs; 178.8 ± 9.2 cm; 74.8 ± 12.5 kg; peak height velocity: 2.53 ± 1.2 yrs) participated in this double-blind, placebo-controlled, crossover designed study. Participants consumed 2 x 70 mL of BR (~12.9 mmol NO3¯; Beet It Sport®) or a nitrate-depleted placebo (PL) 2.5 hours prior to performing isometric mid-thigh pulls (IMTP) and four repeated 20-second Wingate sprints (S1-S4) interspersed with 4 minutes of rest...
March 10, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29490662/vegetarian-style-dietary-pattern-during-adolescence-has-long-term-positive-impact-on-bone-from-adolescence-to-young-adulthood-a-longitudinal-study
#14
Elham Z Movassagh, Adam D G Baxter-Jones, Saija Kontulainen, Susan Whiting, Michael Szafron, Hassan Vatanparast
BACKGROUND: The amount of bone accrued during adolescence is an important determinant of later osteoporosis risk. Little is known about the influence of dietary patterns (DPs) on the bone during adolescence and their potential long-term implications into adulthood. We examined the role of adolescent DPs on adolescent and young adult bone and change in DPs from adolescence to young adulthood. METHODS: We recruited participants from the Saskatchewan Pediatric Bone Mineral Accrual Study (1991-2011)...
February 28, 2018: Nutrition Journal
https://www.readbyqxmd.com/read/29485920/age-related-differences-in-functional-hamstring-quadriceps-ratio-following-soccer-exercise-in-female-youth-players-an-injury-risk-factor
#15
Mark De Ste Croix, Abigail Priestley, Rhodri Lloyd, Jon Oliver
PURPOSE: Fatigue negatively alters dynamic knee control, and the functional hamstring/quadriceps ratio (H/QFUNC ) plays an important role in stabilizing the joint. The aim of this study was to investigate the influence of soccer-specific exercise on H/QFUNC in under (U) 13-, U15-, and U17-year-old female soccer players. METHODS: A total of 36 female players performed concentric and eccentric actions of the hamstrings at 60°, 120°, and 180°/s before and after an age group-specific field-based soccer protocol...
February 27, 2018: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29461418/influence-of-biological-maturity-on-the-match-performance-of-8-to-16-year-old-elite-male-youth-soccer-players
#16
Heita Goto, John G Morris, Mary E Nevill
The aim of this study was to examine the influence of biological maturity on match performance in elite youth male soccer players. The participants were 80 Premier League Academy outfield players (8-16 years old). Biological maturity was determined by calculating estimated chronological age at peak height velocity. The U9 and U10 squads played 6-a-side and the U11-U16 squads played 11-a-side inter-academy matches. All matches were analyzed using a 1 Hz Global Positioning System (SPI elite, GPSport, Australia) with squad specific speed zones which were calculated based on 5 m flying sprint speed in the last 5 m of 10 m sprint test...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29456759/ossification-of-the-phalanges-of-the-foot-and-its-relationship-to-peak-height-velocity-and-the-calcaneal-system
#17
M R Garcia, A D Nicholson, A M Nduaguba, J O Sanders, R W Liu, D R Cooperman
Purpose: There are multiple skeletal maturity grading systems, but none of them utilizes the phalanges of the foot. To minimize radiation, it would be ideal if one could assess the skeletal maturity of a foot based on bones seen on routine foot radiographs, if guided growth is being considered as a treatment option. We developed a system that correlates changes of the appearance of the foot phalanges to peak height velocity (PHV) and the recently described calcaneal apophyseal ossification grading system...
February 1, 2018: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/29456758/binary-and-analogue-markers-of-skeletal-maturity-clinical-utility-of-the-thenar-and-plantar-sesamoids
#18
A D Nicholson, J O Sanders, R W Liu, D R Cooperman
Purpose: We investigate the thenar and plantar sesamoids as markers of skeletal maturity, and grade appearance using two scales, a binary system (absent or present), and an analogue system that relies upon judging regular changes in morphological appearance. Methods: We studied 94 healthy children (49 female and 45 male patients) between ages three and 18 years who had approximately 700 serially acquired sets of radiographs and physical examinations. The children had at least annual radiographs taken of the left hand and left foot...
February 1, 2018: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/29374832/sport-based-physical-activity-recommendations-and-modifications-in-c-reactive-protein-and-arterial-thickness
#19
Suziane Ungari Cayres, Fabio Santos de Lira, Han C G Kemper, Jamile Sanches Codogno, Maurício Fregonesi Barbosa, Romulo Araújo Fernandes
We analyzed the effects of 1 year of engagement in ≥ 300 min/week of organized sports on inflammatory levels and vascular structure in adolescents. The sample was composed of 89 adolescents (11.6 ± 0.7 years old [43 boys and 46 girls]), stratified according to engagement in ≥ 300 min/week of sport practice during at least 12 months of follow-up (n = 15, sport practice; n = 74, non-sport practice). Arterial thickness (carotid and femoral) was assessed by ultrasound scan, while high sensitive C-reactive protein levels were used to assess inflammatory status...
April 2018: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29369950/importance-of-speed-and-power-in-elite-youth-soccer-depends-on-maturation-status
#20
Conall F Murtagh, Thomas E Brownlee, Andrew OʼBoyle, Ryland Morgans, Barry Drust, Robert M Erskine
Murtagh, CF, Brownlee, TE, O'Boyle, A, Morgans, R, Drust, B, and Erskine, RM. Importance of speed and power in elite youth soccer depends on maturation status. J Strength Cond Res 32(2): 297-303, 2018-Maturation status is a confounding factor when identifying talent in elite youth soccer players (ESP). By comparing performance of ESP and control participants (CON) matched for maturation status, the aims of our study were to establish the importance of acceleration, sprint, horizontal-forward jump, and vertical jump capabilities for determining elite soccer playing status at different stages of maturation...
February 2018: Journal of Strength and Conditioning Research
keyword
keyword
8100
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"