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"Peak height velocity"

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https://www.readbyqxmd.com/read/29147571/a-surprising-treatment-response-in-a-patient-with-rare-isolated-growth-hormone-deficiency-type-ib
#1
Jordan Yardain Amar, Kimberly Borden, Elizabeth Watson, Talin Arslanian
Isolated Growth Hormone Deficiency (IGHD) is a rare cause of short stature, treated with the standard regimen of subcutaneous synthetic growth hormone (GH). Patients typically achieve a maximum height velocity in the first year of treatment, which then tapers shortly after treatment is stopped. We report a case of a 9-year-old male who presented with short stature (<3rd percentile for age and race). Basal hormone levels showed undetectable serum IGF1. Skeletal wrist age was consistent with chronologic age...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/29144964/biocultural-approach-of-the-association-between-maturity-and-physical-activity-in-youth
#2
André O Werneck, Danilo R P Silva, Paul Collings, Rômulo A Fernandes, Enio R V Ronque, Manuel J Coelho-E-Silva, Luís B Sardinha, Edilson S Cyrino
OBJECTIVE: To test the biocultural model through direct and indirect associations between biological maturation, adiposity, cardiorespiratory fitness, sadness, social relationships, and physical activity in adolescents. METHODS: This was a cross-sectional study conducted with 1152 Brazilian adolescents aged between 10 and 17 years. Somatic maturation was estimated through Mirwald's method (peak height velocity). Physical activity was assessed through Baecke questionnaire (occupational, leisure, and sport contexts)...
November 13, 2017: Jornal de Pediatria
https://www.readbyqxmd.com/read/29113497/modelling-height-in-adolescence-a-comparison-of-methods-for-estimating-the-age-at-peak-height-velocity
#3
Andrew J Simpkin, Adrian Sayers, Mark S Gilthorpe, Jon Heron, Kate Tilling
BACKGROUND: Controlling for maturational status and timing is crucial in lifecourse epidemiology. One popular non-invasive measure of maturity is the age at peak height velocity (PHV). There are several ways to estimate age at PHV, but it is unclear which of these to use in practice. AIM: To find the optimal approach for estimating age at PHV. SUBJECTS AND METHODS: Methods included the Preece & Baines non-linear growth model, multi-level models with fractional polynomials, SuperImposition by Translation And Rotation (SITAR) and functional data analysis...
November 7, 2017: Annals of Human Biology
https://www.readbyqxmd.com/read/29039261/one-year-follow-up-of-the-capo-kids-trial-are-physical-benefits-maintained
#4
Rossana C Nogueira, Benjamin K Weeks, Belinda Beck
PURPOSE: To determine the 12-month maintenance of a 9-month, thrice-weekly, 10-minute high-intensity exercise program, delivered in schools, on bone and other health-related performance variables in prepubertal children. METHODS: All participants (N = 311) of the CAPO kids trial (testing times T1-T2) were contacted to undergo retesting (T3) of all original measures-including weight, standing and sitting height, calcaneal broadband ultrasound attenuation (Achilles, GE), and stiffness index (Achilles, GE)-waist circumference, resting heart rate, blood pressure, vertical jump, and aerobic capacity...
October 17, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29031643/physical-fitness-and-psychological-health-in-overweight-obese-children-a-cross-sectional-study-from-the-activebrains-project
#5
M Rodriguez-Ayllon, C Cadenas-Sanchez, I Esteban-Cornejo, J H Migueles, J Mora-Gonzalez, P Henriksson, M Martín-Matillas, A Mena-Molina, P Molina-García, F Estévez-López, G M Enriquez, J C Perales, J R Ruiz, A Catena, F B Ortega
OBJECTIVES: To examine the associations of physical fitness (i.e. cardiorespiratory fitness, muscular strength, and speed/agility) with psychological distress and psychological well-being in overweight/obese pre-adolescent children. DESIGN: 110 overweight/obese children (10.0±1.1years old, 61 boys) from the ActiveBrains project (http://profith.ugr.es/activebrains) participated in this cross-sectional study. METHODS: Physical fitness was evaluated by the ALPHA battery test...
October 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28986327/anthropometrics-and-maturity-status-a-preliminary-study-of-youth-football-head-impact-biomechanics
#6
Susan W Yeargin, Payton Kingsley, Jim M Mensch, Jason P Mihalik, Eva V Monsma
CONTEXT: There is a paucity of head impact biomechanics research focusing on youth athletes. Little is known about how youth subconcussive head impact tolerances are related to physical size and maturation. OBJECTIVE: To examine the effects of age, anthropometric and maturational status variability on head impact biomechanics. DESIGN: Cross-sectional. SETTING: Outdoor youth football facilities in South Carolina. PARTICIPANTS: Thirty-four male recreational youth football players, 8 to 13yrs...
October 3, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28931173/hopping-and-landing-performance-in-male-youth-soccer-players-effects-of-age-and-maturation
#7
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Quantifying hopping and landing performances can assist coaches in identifying young male soccer players who may be at increased risk of injury. The influence of chronological age and maturation on these measures in this population is unknown. Single leg hop for distance (SLHD) and 75% horizontal hop and stick landing force (75%Hop) were examined in a cross-sectional sample (N=400) of elite male youth soccer players. Between-group differences for both chronological age (U11-U18) and stage of maturation (pre-, circa- or post-peak height velocity (PHV)) were analyzed...
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28912731/long-term-athletic-development-in-youth-alpine-ski-racing-the-effect-of-physical-fitness-ski-racing-technique-anthropometrics-and-biological-maturity-status-on-injuries
#8
Lisa Müller, Carolin Hildebrandt, Erich Müller, Christian Fink, Christian Raschner
Alpine ski racing is known to be a sport with a high risk of injuries. Because most studies have focused mainly on top-level athletes and on traumatic injuries, limited research exists about injury risk factors among youth ski racers. The aim of this study was to determine the intrinsic risk factors (anthropometrics, biological maturity, physical fitness, racing technique) for injury among youth alpine ski racers. Study participants were 81 youth ski racers attending a ski boarding school (50 males, 31 females; 9-14 years)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28901657/longitudinal-patterns-in-bmi-and-percent-total-body-fat-from-peak-height-velocity-through-emerging-adulthood-into-young-adulthood
#9
Erin Barbour-Tuck, Marta Erlandson, Nazeem Muhajarine, Heather Foulds, Adam Baxter-Jones
OBJECTIVES: Emerging adulthood, a potential critical period, is an understudied period of fat mass accrual. The aim of this study was to describe patterns of fat mass accrual, and weight status, from adolescence, through emerging adulthood, into young adulthood. METHODS: One-hundred-eighteen participants (59 male) were measured repeatedly for 20 years. Annual measures of height, weight, and body composition (DXA) were taken. Calculated measures included: peak height velocity (PHV), biological age (BA; years from PHV), body mass index (BMI), and percent total body fat (%TBF)...
September 13, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28872525/thumb-ossification-composite-index-toci-for-predicting-peripubertal-skeletal-maturity-and-peak-height-velocity-in-idiopathic-scoliosis-a-validation-study-of-premenarchal-girls-with-adolescent-idiopathic-scoliosis-followed-longitudinally-until-skeletal-maturity
#10
Alec L H Hung, W W Chau, B Shi, Simon K Chow, Fiona Y P Yu, T P Lam, Bobby K W Ng, Y Qiu, Jack C Y Cheng
BACKGROUND: Accurate skeletal maturity assessment is important to guide clinical evaluation of idiopathic scoliosis, but commonly used methods are inadequate or too complex for rapid clinical use. The objective of the study was to propose a new simplified staging method, called the thumb ossification composite index (TOCI), based on the ossification pattern of the 2 thumb epiphyses and the adductor sesamoid bone; to determine its accuracy in predicting skeletal maturation when compared with the Sanders simplified skeletal maturity system (SSMS); and to validate its interrater and intrarater reliability...
September 6, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28834796/does-a-one-year-age-gap-modify-the-influence-of-age-maturation-and-anthropometric-parameters-as-determinants-of-performance-among-youth-elite-soccer-players
#11
Iraia Bidaurrazaga-Letona, José Antonio Lekue, Markos Amado, Susana Maria Gil
Since age-groups in soccer often comprise children born within a two-year timeframe, characteristics that define the profile of a successful player may not be appropriate for the oldest or youngest players of the same age group. Therefore, this study aimed to determine to what extent performance was influenced by age, maturation and body size in elite soccer players with barely one year age gap. Anthropometry, 15-m sprint test, modified Barrow´s agility test, Yo-Yo intermittent recovery test level 1, countermovement jump, and handgrip test were conducted in players aged twelve and under (n=82, 11...
August 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28834567/ethnic-differences-in-peripheral-skeletal-development-among-urban-south-african-adolescents-a-ten-year-longitudinal-pqct-study
#12
S M Schoenbuchner, J M Pettifor, S A Norris, L K Micklesfield, A Prentice, K A Ward
There are no longitudinal pQCT data of bone growth and development from sub-Saharan Africa, where rapid environmental, societal and economic transitions are occurring, and where fracture rates are predicted to rise. The aim of this study was to compare skeletal development in black and white South African adolescents using longitudinal data from the Birth to Twenty study. The Birth to Twenty Bone Health sub-cohort consisted of 543 adolescents (261[178 black] girls, 282[201 black] boys). Annual pQCT measurements of the radial and tibial metaphysis and diaphysis were obtained between ages 12 and 22 years (distal metaphysis: cross-sectional area [CSA] and trabecular bone mineral density [BMD]; diaphysis: total and cortical CSA, cortical BMD and polar stress-strain index [SSIp])...
August 23, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28816503/pubertal-development-of-body-size-and-soccer-specific-functional-capacities-in-adolescent-players
#13
Humberto Moreira Carvalho, José A Lekue, Susana M Gil, Iraia Bidaurrazaga-Letona
Pubertal growth in body size and functional capacities were examined in adolescent soccer players (n = 33). The average age at baseline was 10.9 (9.8-11.8 years). Peak height velocity (PHV) and growth curves for body mass and functional performance (countermovement jump, 15-m sprint, agility and Yo-Yo intermittent recovery test - level 1) were determined with Bayesian multilevel models. Estimates for PHV and age at PHV were 8.1 cm/year (95% credible interval: 4.2-18.5 cm/year) and 12.9 years (95% credible interval: 11...
August 17, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28759890/maturity-status-influences-the-relative-age-effect-in-national-top-level-youth-alpine-ski-racing-and-soccer
#14
Lisa Müller, Christoph Gonaus, Christoph Perner, Erich Müller, Christian Raschner
Since the relative age effect (RAE) characterizes a problem in all age categories of alpine ski racing and soccer and the fact that, yet, to date the underlying factors have not been well investigated, the aim of the present study was to assess the influence of the biological maturity status on the RAE among youth alpine ski racers (YSR) and soccer players (SP). In total, 183 male and female YSR selected for national final races and 423 male SP selected for Elite Youth Development Centres were investigated...
2017: PloS One
https://www.readbyqxmd.com/read/28746660/somatic-maturation-and-the-relationship-between-bone-mineral-variables-and-types-of-sports-among-adolescents-cross-sectional-study
#15
Ricardo Ribeiro Agostinete, Igor Hideki Ito, Han Kemper, Carlos Marcelo Pastre, Mário Antônio Rodrigues-Júnior, Rafael Luiz-de-Marco, Rômulo Araújo Fernandes
CONTEXT AND OBJECTIVE: Peak height velocity (PHV) is an important maturational event during adolescence that affects skeleton size. The objective here was to compare bone variables in adolescents who practiced different types of sports, and to identify whether differences in bone variables attributed to sports practice were dependent on somatic maturation status. DESIGN AND SETTING: Cross-sectional study, São Paulo State University (UNESP). METHODS: The study was composed of 93 adolescents (12 to 16...
May 2017: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/28714773/impact-of-martial-arts-judo-karate-and-kung-fu-on-bone-mineral-density-gains-in-adolescents-of-both-genders-9-month-follow-up
#16
Igor H Ito, Han C G Kemper, Ricardo R Agostinete, Kyle R Lynch, Diego G D Christofaro, Enio R Ronque, Rômulo A Fernandes
PURPOSE: To compare bone mineral density (BMD) gains in adolescents of both genders stratified according to different martial art styles in a 9-month follow-up study. METHODS: The longitudinal study consisted of 29 adolescents of both genders and age between 11 and 17 years stratified into a control group (not engaged in any sport) and 50 fighters (kung fu/karate, n = 29; judo, n = 21). All 79 subjects underwent anthropometric measures (weight, height, leg length, and height set) and dual-energy X-ray absorptiometry (BMD, in g/cm(2)) at 2 moments, baseline and 9 months later...
September 22, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28699696/scaling-children-s-waist-circumference-for-differences-in-body-size
#17
Alan M Nevill, Michael J Duncan, Ian M Lahart, Paul Davies, Robinson Ramirez-Velez, Gavin Sandercock
OBJECTIVES: Both waist circumference (WC) and body size (height) increase with age throughout childhood. Hence, there is a need to scale WC in children to detect differences in adiposity status (eg, between populations and different age groups), independent of body size/height. METHODS: Using two culturally different samples, 1 English (10-15.9 years n = 9471) and 2 Colombian (14-15 years, n = 37,948), for WC to be independent of height (HT), a body shape index was obtained using the allometric power law WC = a...
July 12, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28681419/linear-and-nonlinear-relationships-between-body-mass-index-and-physical-fitness-in-brazilian-children-and-adolescents
#18
Vítor P Lopes, Marco Cossio-Bolaños, Rossana Gómez-Campos, Miguel de Arruda, Jefferson Eduardo Hespanhol, Luis P Rodrigues
OBJECTIVES: The purpose of this study was to evaluate the linear and curvilinear relationship between body mass index (BMI) and physical fitness in children and adolescents. METHODS: Participants were 4567 (2505 girls) children aged 6-16 years. Weight and height were measured and BMI was calculated and adjusted for age and sex using WHO z-scores. Physical fitness was evaluated with the following tests: Yo-Yo test, standing long jump, seated 2-kg medicine ball throw, and 20-m dash...
July 5, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28672287/association-between-linear-growth-and-bone-accrual-in-a-diverse-cohort-of-children-and-adolescents
#19
MULTICENTER STUDY
Shana E McCormack, Diana L Cousminer, Alessandra Chesi, Jonathan A Mitchell, Sani M Roy, Heidi J Kalkwarf, Joan M Lappe, Vicente Gilsanz, Sharon E Oberfield, John A Shepherd, Karen K Winer, Andrea Kelly, Struan F A Grant, Babette S Zemel
Importance: Prevention of osteoporosis in adulthood begins with optimizing bone health in early life. The longitudinal association between growth and bone accretion during childhood is not fully understood. Objectives: To assess the acquisition of whole-body (WB) and skeletal site-specific bone mineral content (BMC) relative to linear growth in a healthy, diverse, longitudinal cohort of children, adolescents, and young adults and to test for differences related to sex and African American race...
September 5, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28666392/organized-leisure-time-sport-participation-and-academic-achievement-in-preadolescents
#20
Elvar Smari Sævarsson, Erla Svansdottir, Thorarinn Sveinsson, Tinna Laufey Asgeirsdottir, Sigurbjorn Arni Arngrimsson, Erlingur Johannsson
AIMS: The aims of this study were to study the correlation between lifestyle-related factors, such as organized leisure-time sport participation (OLSP), cardiorespiratory fitness, and adiposity, and academic achievement among preadolescents. METHODS: A cross-sectional study involving 248 nine-year-old school children was carried out. OLSP was self-reported with parental assistance, categorized as ≤ 1× a week, 2-3× a week, and ≥ 4× times a week or more. Academic achievement was estimated with results from standardized test scores in Icelandic and math...
June 1, 2017: Scandinavian Journal of Public Health
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