keyword
https://read.qxmd.com/read/38053390/lower-extremity-strength-relative-to-body-mass-in-pediatric-female-athletes-implications-for-anterior-cruciate-ligament-injury
#21
JOURNAL ARTICLE
Dai Sugimoto, Lyle J Micheli, William P Meehan
This study compared lower extremity (LE) muscular strength by 3 groups of female athletes using chronological age and consideration of age of peak height velocity (PHV). Isometric quadriceps, hamstrings, and hip abductors strength were assessed from physically active, pediatric females. The body mass normalized isometric strength (N m/kg) was compared by the 3 age groups. There were 388 young female athletes (<10 years [14.2%], 11-14 years [48.7%], and 15-18 years [37.1%]). The body mass normalized LE strength was lower in 11-14 years compared with <10 years (quadriceps [ P = ...
December 6, 2023: Clinical Pediatrics
https://read.qxmd.com/read/37981481/factors-associated-with-pubertal-growth-outcomes-in-cystic-fibrosis-early-growth-and-puberty-in-cf
#22
JOURNAL ARTICLE
Rashmi Patil, Amalia S Magaret, Raksha Jain, Jennifer Taylor-Cousar, Kara S Hughan, Traci M Kazmerski
BACKGROUND: Pubertal delays in children with cystic fibrosis (CF) have historically been common. It is unclear to what degree puberty is affected in the new era of CF care or the role of early nutritional status. We hypothesized that more favorable early growth trajectories are associated with improved pubertal growth outcomes. METHODS: We used data from the United States CF Foundation Patient Registry to analyze associations between early weight-for-length/body mass index (WFL-BMI) growth trajectories and pubertal outcomes, using peak height velocity (PHV) and age at PHV (APHV) as proxy measures for puberty in addition to adult height (defined as height at age 18 years)...
November 17, 2023: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://read.qxmd.com/read/37955932/normative-data-on-horizontal-power-acceleration-and-change-of-direction-ability-in-amateur-youth-female-soccer-players
#23
JOURNAL ARTICLE
William H Suits, Meg A Darmofal, Ryan A Bean
BACKGROUND: Physical performance measures such as horizontal power, acceleration, and change-of-direction ability are related to performance in soccer, and may aid in talent selection, coaching decisions and the prescription of training programs. The purpose of this study was to describe the normative values of three performance tests in amateur female youth soccer players. METHODS: A cross-sectional descriptive study design was employed with 151 amateur female youth soccer players (age 14...
November 13, 2023: Journal of Sports Medicine and Physical Fitness
https://read.qxmd.com/read/37944907/parameters-of-pubertal-growth-spurt-in-children-and-adolescents-living-at-high-altitude-in-peru
#24
JOURNAL ARTICLE
Lucila Sanchez-Macedo, Rubén Vidal-Espinoza, Juan Minango-Negrete, Enio Vaz Ronque, Luis Felipe Castelli Correia de Campos, José Fuentes-López, Eliseny Vargas-Ramos, Margot Rivera-Portugal, Marco Cossio-Bolaños, Rossana Gomez-Campos
OBJECTIVES: The aim was to estimate the pubertal growth height of children and adolescents living in a high-altitude region of Peru using the Preece-Baines model 1 (1 PB). METHODS: A cross-sectional study was conducted in schoolchildren from the department of Puno (Peru) between 3841 and 3874 masl. The age range was between 4 and 17 years. Standing height was evaluated. 1 PB was used to infer the mathematical and biological parameters of stature. RESULTS: Mathematical parameters estimated by the 1 PB model reflected small residual standard error (RSE) values in both sexes (0...
November 6, 2023: Jornal de Pediatria
https://read.qxmd.com/read/37943988/change-of-direction-speed-and-deficit-over-single-and-multiple-changes-of-direction-influence-of-biological-age-in-youth-basketball-players
#25
JOURNAL ARTICLE
Oliver Gonzalo-Skok, Chris Bishop
The study analysed the difference in change of direction (COD) deficit among young male basketball players of different age groups and biological ages and analysed the relationships in COD performance (time and deficit) across single and multiple CODs depending on their biological age. Fifty-four highly-trained male players (U-13 and U-17) were tested on sprinting (25-m) and COD ability over single and multiple CODs through total times and the percentage-based COD deficit (CODD). Results showed that older age groups performed significantly (ES = 0...
November 9, 2023: Journal of Sports Sciences
https://read.qxmd.com/read/37890835/the-effect-of-sex-maturity-and-training-status-on-maximal-sprint-performance-kinetics
#26
JOURNAL ARTICLE
Adam Runacres, Kelly A Mackintosh, Melitta A McNarry
PURPOSE: The development of sprint running during youth has received renewed interest, but questions remain regarding the development of speed in youth, especially the influences of sex, training, and maturity status. METHODS: One hundred and forty-seven team sport trained (69 girls; 14.3 [2.1] y) and 113 untrained (64 girls; 13.8 [2.7] y) youth completed two 30-m sprints separated by 2-minute active rest. Velocity was measured using a radar gun at >46 Hz, with power and force variables derived from a force-velocity-power profile...
October 27, 2023: Pediatric Exercise Science
https://read.qxmd.com/read/37888518/the-impact-of-sex-and-biological-maturation-on-physical-fitness-in-adolescent-badminton-players
#27
JOURNAL ARTICLE
Jaime Fernandez-Fernandez, Alba Herrero-Molleda, Francisco Álvarez-Dacal, Jose Luis Hernandez-Davó, Urs Granacher
The main objective of this study was to examine the impact of maturity status and sex on selected measures of physical fitness in adolescent badminton players. Eighty-one badminton players (39 boys, 42 girls; age: 12.7 ± 1.4 years; body height: 153.5 ± 10.5 cm; body mass: 48.3 ± 13.2 kg) participated in the study and were divided into pre-peak height velocity (PHV, n = 31), circa-PHV ( n = 29), and post-PHV ( n = 21) groups. The assessment of physical fitness included linear sprint (5-m, 10-m) and change-of-direction (CoD) speed tests using a modified 5-0-5 CoD test (CoD deficit [CoDD%]) and an on-court CoD test, as well as the countermovement jump (CMJ) test as a proxy of lower limbs' muscle power...
October 3, 2023: Sports
https://read.qxmd.com/read/37867753/do-maturation-anthropometrics-and-leg-muscle-qualities-influence-repeated-change-of-direction-performance-in-adolescent-boys-and-girls
#28
JOURNAL ARTICLE
Matteo Giuriato, Vittoria Carnevale Pellino, Nicola Lovecchio, Roberto Codella, Matteo Vandoni, Scott Talpey
The ability to change direction rapidly is a key fitness quality especially in invasive sports where young players perform approximately 300 changes of direction in a game. There is currently limited understanding of how anthropometric characteristics and maturation status influence change of direction ability in adolescent. Therefore, the purpose of this investigation is to assess the influence of anthropometrics and maturation status on change of direction ability in young people. The study involved 706 adolescents (367 girls) aged 14-19-year-old attending the same high school in Northern Italy...
October 2023: Biology of Sport
https://read.qxmd.com/read/37844556/short-stature-and-distinct-growth-characteristics-in-angelman-syndrome
#29
JOURNAL ARTICLE
Noah Gruber, Ayman Daka, Noy Lapidot, Dalit Modan-Moses, Orit Pinhas-Hamiel, Bruria Ben Zeev, Gali Heimer
Objectives - Angelman syndrome (AS) is a rare, genetic, neurodevelopmental disorder characterized by severe impairments in speech, cognition and motor skills accompanied by unique behaviors, distinct facial features and high prevalence of epilepsy and sleep problems. Despite some reports of short stature among AS patients, this feature is not included in the clinical criteria defined in 2005. We investigated growth patterns among AS patients with respect to mutation type, growth periods, family history and endocrine abnormalities...
October 16, 2023: Hormone Research in Pædiatrics
https://read.qxmd.com/read/37823577/can-we-reduce-injury-risk-during-the-adolescent-growth-spurt-an-iterative-sequence-of-prevention-in-male-academy-footballers
#30
JOURNAL ARTICLE
David Johnson, Sean Williams, Ben Bradley, Sean P Cumming
Background: The adolescent growth spurt is associated with an increased risk of injury in young athletes. Aim: This study aimed to use an interdisciplinary collaboration between technical coaches, sports scientists, and medical staff to mitigate this risk. Subjects and methods: 77 male academy footballers were followed across two seasons. At-risk players were identified using somatic maturity status and growth rate in stature and the lower limbs, using thresholds of 88% to 92.8% of predicted adult stature, ≥7...
February 2023: Annals of Human Biology
https://read.qxmd.com/read/37815244/influence-of-maturation-and-determinants-of-repeated-sprint-ability-in-youth-basketball-players
#31
JOURNAL ARTICLE
Oliver Gonzalo-Skok, Chris Bishop
Gonzalo-Skok, O, and Bishop, C. Influence of maturation and determinants of repeated-sprint ability in youth basketball players. J Strength Cond Res XX(X): 000-000, 2023-The main aims of the current study were (a) to determine the main predictors of general and specific repeated-sprint ability (RSA) tests, (b) to analyze the relationships between RSA tests and independent measures of physical performance, (c) to examine whether between-age differences exist, and (d) to assess whether maturation affects those mentioned above in young basketball players...
October 6, 2023: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/37813396/validation-of-central-peak-height-method-for-final-adult-height-predictions-on-long-leg-radiographs
#32
JOURNAL ARTICLE
Marco Brenneis, Niklas Thewes, Jana Holder, Felix Stief, Sebastian Braun
AIMS: Accurate skeletal age and final adult height prediction methods in paediatric orthopaedics are crucial for determining optimal timing of growth-guiding interventions and minimizing complications in treatments of various conditions. This study aimed to evaluate the accuracy of final adult height predictions using the central peak height (CPH) method with long leg X-rays and four different multiplier tables. METHODS: This study included 31 patients who underwent temporary hemiepiphysiodesis for varus or valgus deformity of the leg between 2014 and 2020...
October 10, 2023: Bone & joint open
https://read.qxmd.com/read/37787566/menarche-at-amarna-timing-and-the-further-implications
#33
JOURNAL ARTICLE
Gretchen R Dabbs
OBJECTIVE: This article examines skeletal development in non-elite individuals from Amarna to identify the age of menarche. MATERIALS AND METHODS: The total sample (n = 267; 65 female, 39 male, 163 indeterminate) was examined for six variables indicative of the pubertal stage (mineralization of the mandibular canine root [n = 46], distal radius fusion [n = 227], proximal ulna fusion [n = 220], distal humerus fusion [n = 237], presence of the iliac crest epiphysis [n = 24], iliac crest fusion [n = 199])...
October 3, 2023: American journal of biological anthropology
https://read.qxmd.com/read/37742137/cerebral-blood-flow-and-cerebrovascular-reactivity-are-modified-by-maturational-stage-and-exercise-training-status-during-youth
#34
JOURNAL ARTICLE
Jack S Talbot, Dean R Perkins, Christine M Tallon, Tony G Dawkins, Andrew J M Douglas, Ryan Beckerleg, Andrew Crofts, Melissa E Wright, Saajan Davies, Jessica J Steventon, Kevin Murphy, Rachel N Lord, Christopher J A Pugh, Jon L Oliver, Rhodri S Lloyd, Philip N Ainslie, Ali M McManus, Mike Stembridge
NEW FINDINGS: What is the central question of this study? Gonadal hormones modulate cerebrovascular function while insulin-like growth factor 1 (IGF-1) facilitates exercise-mediated cerebral angiogenesis; puberty is a critical period of neurodevelopment alongside elevated gonadal hormone and IGF-1 activity: but whether exercise training across puberty enhances cerebrovascular function is unkown. What is the main finding and its importance? Cerebral blood flow is elevated in endurance trained adolescent males when compared to untrained counterparts...
September 24, 2023: Experimental Physiology
https://read.qxmd.com/read/37690116/pediatric-features-of-genetic-predisposition-to-polycystic-ovary-syndrome
#35
JOURNAL ARTICLE
Jia Zhu, Anders U Eliasen, Izzuddin M Aris, Sara E Stinson, Jens-Christian Holm, Torben Hansen, Marie-France Hivert, Klaus Bønnelykke, Rany M Salem, Joel N Hirschhorn, Yee-Ming Chan
CONTEXT: Polycystic ovary syndrome (PCOS) has historically been conceptualized as a disorder of the reproductive system in women. However, offspring of women with PCOS begin to show metabolic features of PCOS in childhood, suggestive of childhood manifestations. OBJECTIVE: To identify childhood manifestations of genetic risk for PCOS. METHODS: We calculated a PCOS polygenic risk score (PRS) for 12 350 girls and boys in 4 pediatric cohorts-ALSPAC (UK), COPSAC (Denmark), Project Viva (USA), and The HOLBÆK Study (Denmark)...
January 18, 2024: Journal of Clinical Endocrinology and Metabolism
https://read.qxmd.com/read/37642417/preece-baines-1-model-validation-for-cross-sectional-data-in-male-soccer-players-according-to-maturity-status
#36
JOURNAL ARTICLE
Luis Alberto Flores Olivares, Maria Isabel Caldas Januário Fragoso
AIM: The aim of the present study was to compare the Preece-Baines 1 (PB1) model fit between longitudinal and cross-sectional data in male soccer players and to adjust the height growth curve by maturity status. METHODS: A final sample of 57 male Portuguese soccer players from professional soccer academies was included. Longitudinal height records were measured between 8 and 17 times in each subject from 2-8 years to 14-17 years. Additionally, longitudinal height records were used as cross-sectional data along with 1087 cross-sectional height records taken from 602 Portuguese soccer players...
August 29, 2023: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://read.qxmd.com/read/37639654/longitudinal-development-of-sprint-performance-and-force-velocity-power-characteristics-influence-of-biological-maturation
#37
JOURNAL ARTICLE
Toby Edwards, Jonathon Weakley, Harry G Banyard, Ashley Cripps, Benjamin Piggott, G Gregory Haff, Christopher Joyce
Edwards, T, Weakley, J, Banyard, HG, Cripps, A, Piggott, B, Haff, GG, and Joyce, C. Longitudinal development of sprint performance and force-velocity-power characteristics: influence of biological maturation. J Strength Cond Res 37(11): 2178-2184, 2023-This study was designed to investigate the influence of biological maturation on the longitudinal development of sprint performance. Thirty-two subjects performed 2 assessments of maximal sprint performance that were separated by 18 months. Each sprint assessment was measured through a radar gun that collected instantaneous velocity with the velocity-time data used to derive sprint times and force-velocity-power characteristics...
November 1, 2023: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/37571975/adolescents-running-in-conventional-running-shoes-have-lower-vertical-instantaneous-loading-rates-but-greater-asymmetry-than-running-barefoot-or-in-partial-minimal-shoes
#38
JOURNAL ARTICLE
Jae Kim, Simon C McSweeney, Karsten Hollander, Thomas Horstman, Scott C Wearing
Footwear may moderate the transiently heightened asymmetry in lower limb loading associated with peak growth in adolescence during running. This repeated-measures study compared the magnitude and symmetry of peak vertical ground reaction force and instantaneous loading rates (VILRs) in adolescents during barefoot and shod running. Ten adolescents (age, 10.6 ± 1.7 years) ran at self-selected speed (1.7 ± 0.3 m/s) on an instrumented treadmill under three counter-balanced conditions; barefoot and shod with partial-minimal and conventional running shoes...
June 2023: Journal of Sports Sciences
https://read.qxmd.com/read/37535341/the-effect-of-biological-maturation-on-foot-morphology-and-their-relation-to-postural-stability-performance-in-male-footballers
#39
JOURNAL ARTICLE
Ferdia Fallon Verbruggen, Maroš Kaľata, Jitka Marenčáková, Tomáš Malý, František Zahálka
BACKGROUND: Biological maturity (BM) and foot morphology (FM) can independently alter neuromuscular loading on the ankle-foot complex, potentially causing stability deficits and injury predisposition. However, the influence of BM on FM, and how much both explain neuromuscular performance in postural stability (PS) tests, has been understudied. This study aimed to investigate the effect of BM on FM, and then discover to what extent both factors explain the variance in PS performance in adolescent footballers...
August 3, 2023: Journal of Sports Medicine and Physical Fitness
https://read.qxmd.com/read/37525236/are-flat-feet-a-disadvantage-in-performing-unilateral-and-bilateral-explosive-power-and-dynamic-balance-tests-in-boys-a-school-based-study
#40
JOURNAL ARTICLE
Peter Sagat, Peter Bartik, Lovro Štefan, Vangelis Chatzilelekas
BACKGROUND: Little evidence has been provided regarding physical performance and flat-footedness in school-age children. Although flat feet may decrease the level of motor performance, findings remain inconsistent. Therefore, the main purpose of the study was to determine whether children with flat feet had poorer physical task performance, compared to normal-footed children. METHODS: A total of 208 primary school boys were included in the study (107 normal-footed and 101 flatfooted boys)...
July 31, 2023: BMC Musculoskeletal Disorders
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