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https://www.readbyqxmd.com/read/28630582/doubly-disadvantaged-the-relative-age-effect-in-poland-s-basketball-players
#1
Krystian Rubajczyk, Kamil Świerzko, Andrzej Rokita
The aim of this study was to identify the relative age effect (RAE) in young Polish male (n = 3849) and female (n = 3419) basketball players aged 14 to 22 years competing in the elite games of the Polish Youth Championships. The distribution of birth dates, body height, players' match statistics, and the results of teams participating in championships were identified. The RAE was observed in male and female group, regardless of players age. Nevertheless, the greatest disproportion in the distribution of dates of birth was found in U16 group of boys (V = 0...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630572/the-role-of-a-relative-age-effect-in-the-7-th-international-children-s-winter-games-2016-and-the-influence-of-biological-maturity-status-on-selection
#2
Lisa Müller, Carolin Hildebrandt, Christian Raschner
The aim of this study was to analyse the role of a relative age effect (RAE) and to investigate the influence of biological maturity status on the RAE at the 7(th) International Children`s Winter Games. The birth dates of all 572 participants (365 males, 207 females) were analysed, and the biological maturity status of 384 athletes (243 males, 141 females) was assessed by the age at peak height velocity (APHV) method. A RAE was present in the total sample (χ(2) = 67.81; p < 0.001), and among both male (χ(2) = 49...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28608181/modified-maturity-offset-prediction-equations-validation-in-independent-longitudinal-samples-of-boys-and-girls
#3
Sławomir M Kozieł, Robert M Malina
BACKGROUND: Predicted maturity offset and age at peak height velocity are increasingly used with youth athletes, although validation studies of the equations indicated major limitations. The equations have since been modified and simplified. OBJECTIVE: The objective of this study was to validate the new maturity offset prediction equations in independent longitudinal samples of boys and girls. METHODS: Two new equations for boys with chronological age and sitting height and chronological age and stature as predictors, and one equation for girls with chronological age and stature as predictors were evaluated in serial data from the Wrocław Growth Study, 193 boys (aged 8-18 years) and 198 girls (aged 8-16 years)...
June 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28605273/improving-the-prediction-of-maturity-from-anthropometric-variables-using-a-maturity-ratio
#4
Job Fransen, Stephen Bush, Stephen Woodcock, Andrew Novak, Dieter Deprez, Adam D G Baxter-Jones, Roel Vaeyens, Matthieu Lenoir
PURPOSE: This study aimed to improve the prediction accuracy of Age at Peak Height Velocity (APHV) from anthropometric assessment using non-linear models and a maturity ratio rather than a maturity offset. METHODS: The dataset used to develop the original prediction equations was used to test a new prediction model, utilising the maturity ratio and a polynomial prediction equation. This model was then applied to a sample of male youth academy soccer players (n = 1330) to validate the new model in youth athletes...
June 12, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28604286/growth-functional-capacities-and-motivation-for-achievement-and-competitiveness-in-youth-basketball-an-interdisciplinary-approach
#5
Humberto Moreira Carvalho, Carlos E Gonçalves, Dave Collins, Roberto R Paes
The interaction of multiple influences on the path to sport success is not yet fully understood by sport scientists. In this study, we examined variation in body size, functional capacities and motivation for achievement, competitiveness and deliberate practice of youth basketball players associated with differences in biological maturity status, chronological age and years of training experience. Reflecting the importance of interactive effects, we examined the relationships between the psychological variables and functional capacities...
June 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28590266/sex-differences-in-aortic-augmentation-index-in-adolescents
#6
Jennifer Y Barraclough, Frances L Garden, Brett Toelle, Shamus O'Meagher, Guy B Marks, Christopher T Cowell, David S Celermajer, Julian G Ayer
BACKGROUND: Augmentation index (AIx) is a noninvasive measure of pulse wave reflection. AIx is associated with cardiovascular disease. Adult women have a higher AIx than men, but the factors determining this sex-related difference remain to be determined. METHODS: To examine factors associated with AIx in adolescents, participants in the Childhood Asthma Prevention Study, followed from birth, were assessed at age 14 years, with AIx standardized to a heart rate of 75/min (AIx_75) and pulse wave velocity...
June 5, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28580404/the-associations-of-exposure-to-combined-hormonal-contraceptive-use-on-bone-mineral-content-and-areal-bone-mineral-density-accrual-from-adolescence-to-young-adulthood-a-longitudinal-study
#7
Stefan A Jackowski, Adam D G Baxter-Jones, Ashlee J McLardy, Roger A Pierson, Carol D Rodgers
BACKGROUND: The association of long term combined hormone based contraceptives (CHC) use on bone mineral content (BMC) and areal bone mineral density (aBMD) development remains controversial, as it appears that the relationship may be age-dependent. The purpose of this study was to investigate the long-term associations of CHC exposure on the accrual of bone parameters from adolescence into young-adulthood. METHODS: 110 women (67 exposed to CHC) were drawn from the Pediatric Bone Mineral Accrual Study (PBMAS)...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28556682/bouts-of-vigorous-physical-activity-and-bone-strength-accrual-during-adolescence
#8
Leigh Gabel, Heather M Macdonald, Lindsay Nettlefold, Heather A McKay
PURPOSE: To examine the influence of vigorous physical activity (VPA) bout frequency on bone strength accrual across adolescence, independent of total volume of VPA. METHOD: We measured VPA (6 METs; total volume and bout frequency < 5 min in duration) annually using waist-worn accelerometers (ActiGraph GT1M) in 309 adolescents (9-20 years at baseline: 99, <13 years; 126, 13-18 years; 84, >18 years) over a maximum of 4 years. We applied finite element analysis to high-resolution peripheral quantitative computed tomography scans of the distal tibia (8% site) to estimate bone strength (failure load; F...
May 30, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28523517/body-size-of-male-youth-soccer-players-1978-2015
#9
REVIEW
Robert M Malina, António J Figueiredo, Manuel J Coelho-E-Silva
BACKGROUND: Studies of the body size and proportions of athletes have a long history. Comparisons of athletes within specific sports across time, though not extensive, indicate both positive and negative trends. OBJECTIVE: To evaluate secular variation in heights and weights of male youth soccer players reported in studies between 1978 and 2015. METHODS: Reported mean ages, heights, and weights of male soccer players 9-18 years of age were extracted from the literature and grouped into two intervals: 1978-99 and 2000-15...
May 18, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28479496/effect-of-early-life-physical-growth-on-midlife-vertebral-dimensions-the-northern-finland-birth-cohort-1966-study
#10
Petteri Oura, Markus Paananen, Marja Ojaniemi, Juha Auvinen, Juho-Antti Junno, Jaro Karppinen, Jaakko Niinimäki
Small vertebral size is an independent risk factor for osteoporotic vertebral fractures. Physical growth in early life is related to bone health in later life, but the relationship of early growth versus vertebral size has been inconclusively studied. Utilizing the Northern Finland Birth Cohort 1966 with a 47-year follow-up, we investigated how physical growth in early life is associated with midlife vertebral dimensions. We obtained several physical growth parameters of 1) birth (gestational age, length, weight, BMI), 2) infancy and childhood (peak height velocity (PHV), peak weight velocity (PWV), adiposity peak (AP), adiposity rebound (AR)), and 3) puberty (BMI at growth spurt take-off (TO), PHV, height change)...
May 4, 2017: Bone
https://www.readbyqxmd.com/read/28430896/evidence-of-secular-trend-in-mandibular-pubertal-growth
#11
Raphael Patcas, Daniel B Wiedemeier, Goran Markic, Philipp Beit, Heidi Keller
Background: During puberty, mandibular growth follows a growth curve comparable to somatic growth. This study aimed to review the relationship between mandibular pubertal peak height velocity (PHV) and skeletal age, and to investigate the possibility of a secular trend. Methods: Retrospective analysis was performed of two historical craniofacial growth studies (Denver Growth Study; observational time: 1943-1965, and Zurich Growth Study; observational time: 1982-1984) of healthy untreated subjects...
April 20, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28424059/insight-into-human-pubertal-growth-by-applying-the-qeps-growth-model
#12
Anton Holmgren, Aimon Niklasson, Lars Gelander, A Stefan Aronson, Andreas F M Nierop, Kerstin Albertsson-Wikland
BACKGROUND: Computerized mathematical models describing absolute and relative individual growth during puberty in both cm and standard deviation (SD)-scores are lacking. The present study aimed to fill this gap, by applying the QEPS-model that delineates mathematically the specific pubertal functions of the total growth curve. METHODS: Study population used was the individual growth curves of the longitudinally followed cohort GrowUp1974 Gothenburg (n = 2280)...
April 19, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28416037/birth-weight-biological-maturation-and-obesity-in-adolescents-a-mediation-analysis
#13
A O Werneck, D R P Silva, P J Collings, R A Fernandes, E R V Ronque, M J Coelho-E-Silva, L B Sardinha, E S Cyrino
This study was aimed to investigate associations between birth weight and multiple adiposity indicators in youth, and to examine potential mediating effects by biological maturation. This was a school-based study involving 981 Brazilian adolescents aged between 10 and 17 years. Birth weight was reported retrospectively by mothers. Maturation was estimated by age of peak height velocity. Adiposity indicators included body mass index (BMI), waist circumference and percent body fat estimated from triceps and subscapular skinfolds...
April 18, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28396902/progressive-skeletal-benefits-of-physical-activity-when-young-as-assessed-at-the-midshaft-humerus-in-male-baseball-players
#14
S J Warden, A M Weatherholt, A S Gudeman, D C Mitchell, W R Thompson, R K Fuchs
Physical activity benefits the skeleton, but there is contrasting evidence regarding whether benefits differ at different stages of growth. The current study demonstrates that physical activity should be encouraged at the earliest age possible and be continued into early adulthood to gain most skeletal benefits. INTRODUCTION: The current study explored physical activity-induced bone adaptation at different stages of somatic maturity by comparing side-to-side differences in midshaft humerus properties between male throwing athletes and controls...
April 10, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28394831/progression-in-youth-soccer-selection-and-identification-in-youth-soccer-players-aged-13-15-years
#15
Iraia Bidaurrazaga-Letona, José Antonio Lekue, Markos Amado, Susana Maria Gil
The aim of this study was to identify the factors which are important for the identification and selection of young soccer players. Ninety four adolescent soccer players from the Under-13 (U13; age=12.3 ± 0.3 years; n=50) and Under-15 (U15; age=14.0 ± 0.2 years; n=44) categories belonging to a professional club participated in the study. Anthropometric measurements, physical tests (sprint, agility, endurance and jump) and maturity status (age at peak height velocity) were recorded over four seasons. Comparisons were performed amongst new players joining the club (Enter players, n=15), players progressing to the next age category (Club players, n=54) and players leaving the club (Deselected players, n=25)...
April 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28326606/physical-activity-sedentary-time-and-bone-strength-from-childhood-to-early-adulthood-a-mixed-longitudinal-hr-pqct-study
#16
Leigh Gabel, Heather M Macdonald, Lindsay Nettlefold, Heather A McKay
Bone strength is influenced by bone geometry, density, and bone microarchitecture, which adapt to increased mechanical loads during growth. Physical activity (PA) is essential for optimal bone strength accrual; however, less is known about how sedentary time influences bone strength and its determinants. Thus, our aim was to investigate the prospective associations between PA, sedentary time, and bone strength and its determinants during adolescence. We used HR-pQCT at distal tibia (8% site) and radius (7% site) in 173 girls and 136 boys (aged 9 to 20 years at baseline)...
March 22, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28295804/family-history-of-cardiovascular-disease-and-parental-lifestyle-behaviors-are-associated-with-offspring-cardiovascular-disease-risk-markers-in-childhood
#17
Danilo R Silva, André O Werneck, Paul J Collings, Rômulo A Fernandes, Décio S Barbosa, Enio R V Ronque, Luís B Sardinha, Edilson S Cyrino
INTRODUCTION: Cardiovascular disease risk markers have become more prevalent in childhood. To provide increased understanding of the etiology of this public health issue, we investigated associations between family characteristics with cardiovascular disease risk markers in adolescents from a developing nation. METHODS: In this cross-sectional study data for fasting glucose, lipoproteins (LDL-C and HDL-C), triglycerides, and total cholesterol were collected from 991 adolescents aged 10-17 who were recruited from public schools in Londrina city, Southern Brazil...
March 11, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28287685/care-of-shoulder-pain-in-the-overhead-athlete
#18
Joseph Chorley, Richard E Eccles, Armand Scurfield
Shoulder complaints are common in the overhead athlete. Understanding the biomechanics of throwing and swimming requires understanding the importance of maintaining the glenohumeral relationship of the shoulder. Capsular laxity, humeral retrotorsion, glenoid retroversion, glenohumeral internal rotation deficit, and scapular dyskinesis can all contribute to shoulder dysfunction and pain. Injuries are more likely during peak height velocity, especially when coupled with overuse, previous injuries not adequately treated, or change in the demands on the shoulder such as a new technique, bigger field, or longer race...
March 1, 2017: Pediatric Annals
https://www.readbyqxmd.com/read/28273428/mechanical-biochemical-and-dietary-determinants-of-the-functional-model-of-bone-development-of-the-radius-in-children-and-adolescents
#19
Izabella Atena Ludwa, Bareket Falk, Wendy E Ward, Kimberley L Gammage, Panagiota Klentrou
This study examined the degree to which various mechanical, biochemical and dietary factors are related to non-weight bearing bone properties in 172 healthy peri-pubertal children (11.7±2.0 years). Dominant radial speed of sound (rSOS) was measured by transaxial quantitative ultrasound at distal radius. Potential modulating factors included somatic maturity offset (years from age of peak height velocity), grip strength, forearm lean cross-sectional area (CSA), physical activity, nutritional intake and amino-terminal cross-linking propeptide (NTx), reflecting bone resorption...
March 8, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28218400/growth-references-for-tsimane-forager-horticulturalists-of-the-bolivian-amazon
#20
Aaron D Blackwell, Samuel S Urlacher, Bret Beheim, Christopher von Rueden, Adrian Jaeggi, Jonathan Stieglitz, Benjamin C Trumble, Michael Gurven, Hillard Kaplan
OBJECTIVES: Growth standards and references currently used to assess population and individual health are derived primarily from urban populations, including few individuals from indigenous or subsistence groups. Given environmental and genetic differences, growth may vary in these populations. Thus, there is a need to assess whether international standards are appropriate for all populations, and to produce population specific references if growth differs. Here we present and assess growth references for the Tsimane, an indigenous population of Bolivian forager-horticulturalists...
March 2017: American Journal of Physical Anthropology
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