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"Peak height velocity"

Ilaria Di Giovanni, M Loredana Marcovecchio, Valentina Chiavaroli, Tommaso de Giorgis, Francesco Chiarelli, Angelika Mohn
AIM: Perinatal factors seem to influence the onset of puberty, but there is limited information on the potential effect of large size at birth on pubertal growth. This study evaluated pubertal growth in children born large for gestational age (LGA) compared to children born appropriate for gestational age (AGA). METHODS: Longitudinal growth data collected from 70 children - 40 AGA and 30 LGA - were analysed. The ages at take-off, peak height velocity, final height and pubertal growth spurts were calculated using the Preece-Baines model one...
October 15, 2016: Acta Paediatrica
Timo Rantalainen, Benjamin K Weeks, Rossana C Nogueira, Belinda R Beck
Skeletal robustness (cross-section size relative to length) is associated with stress fractures in adults, and appears to explain the high incidence of distal radius fractures in adolescents. However, little is known about the ontogeny of long bone robustness during the first three decades of life. Therefore, we explored the ontogeny of tibial, fibular, ulnar and radial robustness in a cross-sectional sample of 5 to 29year-old volunteers of both sexes. Peripheral quantitative computed tomography (pQCT) was used to evaluate cross-sections of the leg (4%, 14%, 38% and 66%), and forearm (4%, and 66%) in N=432 individuals...
September 17, 2016: Bone
Michel S Brink, Anna W Kersten, Wouter G P Frencken
: A mismatch between the intended training exertion by the coach and the perceived exertion by players is well established in sports. However, it is unknown if coaches are able to accurately observe exertion of individual players during training. Furthermore, the discrepancy in coaches' and players' perceptions has not been explained. PURPOSE: We aim to 1) determine the relation between intended and observed training exertion by the coach and perceived training exertion by the player and 2) establish if on-field training characteristics, intermittent endurance capacity and maturity status explain the mismatch...
September 6, 2016: International Journal of Sports Physiology and Performance
Maribel Casas, Herman T den Dekker, Claudia J Kruithof, Irwin K Reiss, Martine Vrijheid, Johan C de Jongste, Vincent W V Jaddoe, Liesbeth Duijts
BACKGROUND: Greater infant weight gain is associated with lower lung function and increased risk of childhood asthma. The role of early childhood peak growth patterns is unclear. We assessed the associations of individually derived early childhood peak growth patterns with respiratory resistance, fractional exhaled nitric oxide, wheezing patterns, and asthma until school-age. METHODS: We performed a population-based prospective cohort study among 5364 children. Repeated growth measurements between 0 and 3 years of age were used to derive standard deviation scores (s...
October 5, 2016: Pediatric Allergy and Immunology
Cristine E Agresta, Chris Church, John Henley, Tim Duer, Kathleen OʼBrien
Over 30 million US adolescents participate in sport and exercise. Lower extremity injury from sport participation accounts for up to 89% of injuries each year. The single leg squat (SLS) is a simple clinical tool that assesses lower extremity mechanics often associated with injury risk. To date, there is limited information regarding SLS performance in healthy children. Such information could be useful when assessing youth athletes to determine if mechanics demonstrated are different than is to be expected and puts them at risk for injury...
August 26, 2016: Journal of Strength and Conditioning Research
Benlong Shi, Saihu Mao, Zhen Liu, Xu Sun, Zezhang Zhu, Feng Zhu, Jack C Y Cheng, Yong Qiu
BACKGROUND: Height velocity (HV) is traditionally used to monitor the residual growth potential in idiopathic scoliosis (IS). The temporal timing of rapid increase in standing height often does not match exactly that of the increase in spine height. The purposes of this study were to analyze the correlation between change of angle velocity (AV) vs the changes of spinal growth velocity (SGV) and HV, and the associated predictive value on curve progression in IS. METHODS: Pre-pubertal IS girls with single curve receiving standardized bracing treatment followed longitudinally with documented curve progression >5° were retrospectively reviewed...
2016: BMC Musculoskeletal Disorders
Leigh Gabel, Heather M Macdonald, Heather A McKay
Sex differences in bone strength and fracture risk are well-documented. However, we know little about bone strength accrual during growth and adaptations in bone microstructure, density and geometry that accompany gains in bone strength. Thus, our objectives are to 1) describe growth related adaptations in bone microarchitecture, geometry, density and strength at the distal tibia and radius in boys and girls; 2) compare differences in adaptations in bone microarchitecture, geometry, density and strength between boys and girls...
August 24, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
Lisa Müller, Erich Müller, Carolin Hildebrandt, Christian Raschner
The relative age effect (RAE) is a well-documented phenomenon in youth sports. This effect exists when the relative age quarter distribution of selected athletes shows a biased distribution with an over-representation of relatively older athletes. In alpine ski racing, it exists in all age categories (national youth levels up to World Cup). Studies so far could demonstrate that selected ski racers are relatively older, taller and heavier. It could be hypothesized that relatively younger athletes nearly only have a chance for selection if they are early maturing...
2016: PloS One
Jason Moran, Gavin R H Sandercock, Rodrigo Ramírez-Campillo, César Meylan, Jay Collison, Dave A Parry
This meta-analysis investigated the maturation-related pattern of adaptations to resistance training in boy athletes. We included studies examining the effects of 4-16-week resistance training programmes in healthy boy athletes aged 10-18 years. Pooled estimates of effect size for change in strength across all studies (n = 19) were calculated using the inverse-variance random effects model for meta-analyses. Estimates were also calculated for groups based on likely biological maturity status ("before", "during" and "after" peak height velocity)...
July 25, 2016: Journal of Sports Sciences
Robert W Meyers, Jon L Oliver, Michael G Hughes, Rhodri S Lloyd, John B Cronin
PURPOSE: This study examined how the characteristics of maximal overground sprint performance are affected by the period of peak height velocity (PHV) in boys. METHODS: One hundred and eighty-nine school-aged boys completed two assessments of maximal sprint performance, separated by a 21-month period. Kinematic characteristics of sprint performance were collected during a 30 m sprint using a floor-level optical measurement system, with modelled force and stiffness characteristics also calculated...
July 18, 2016: Medicine and Science in Sports and Exercise
Daniel López-Plaza, Fernando Alacid, José María Muyor, Pedro Ángel López-Miñarro
This study aimed to identify the maturity-related differences and its influence on the physical fitness, morphological and performance characteristics of young elite paddlers. In total, 89 kayakers and 82 canoeists, aged 13.69 ± 0.57 years (mean ± s), were allocated in three groups depending on their age relative to the age at peak height velocity (pre-APHV, circum-APHV and post-APHV) and discipline (kayak and canoe). Nine anthropometric variables, a battery of four physical fitness tests (overhead medicine ball throw, countermovement jump, sit-and-reach test and 20 m multistage shuttle run test) and three specific performance tests (1000, 500 and 200 m) were assessed...
July 19, 2016: Journal of Sports Sciences
Diana Kuh, Stella G Muthuri, Adam Moore, Tim J Cole, Judith E Adams, Cyrus Cooper, Rebecca Hardy, Kate A Ward
OBJECTIVES: To investigate the effect of pubertal timing, assessed in adolescence, on bone size, strength and density in men and women in early old age. DESIGN: A British birth cohort study with prospective indicators of pubertal timing based on age at menarche, clinical assessment of pubertal stage, and growth tempo from serial height measures, and bone measures derived from peripheral quantitative computed tomography (pQCT) and dual-energy X-ray absorptiometry (DXA) at 60-64 years of age among 866 women and 792 men...
July 10, 2016: International Journal of Epidemiology
Maria F Bernal-Orozco, Margarita Posada-Falomir, Celia M Quiñónez-Gastélum, Paola Plascencia-Aguilera, Paola Plascencia-Aguilera, Juan R Arana-Nuño, Juan P Tamayo-González, Rafael Ortega-Orozco, Gabriela Macedo-Ojeda, Fabiola Márquez-Sandoval, Barbara Vizmanos-Lamotte
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Kyle S Beyer, David H Fukuda, Ran Wang, Michael B La Monica, Tyler W D Muddle, Jay R Hoffman, Jeffrey R Stout
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Natalia Nowak-Szczepanska, Slawomir Koziel
There are numerous studies concerning sexual dimorphism in body proportions, but only a few have investigated growth in the relative length of particular segments of the upper and lower limbs during adolescence. The aim of the study is an assessment of sex differences of longitudinal growth in the relative length of the forearm and knee height among adolescents. Sample involved 121 boys and 111 girls, participants of the Wroclaw Growth Study, examined annually between 8 and 18 years of age. Sexual dimorphism in six ratios: forearm length and knee height relatively to: trunk, height, and limb length were analyzed using a two-way analysis of variance with repeated measurements...
October 2016: American Journal of Physical Anthropology
André O Werneck, Danilo R Silva, Paul J Collings, Rômulo A Fernandes, Enio R V Ronque, Décio S Barbosa, Edilson S Cyrino
BACKGROUND: Earlier biological maturation has been related to increased metabolic risk. In this study, we verified mediating effects by central adiposity of the relationship between somatic maturity and metabolic risk factors in adolescents. METHODS: In a cross-sectional study, 1034 adolescents aged 10-16 years from Londrina/PR/Brazil were evaluated. The age of peak height velocity (PHV) method was used to evaluate somatic maturity. Central adiposity was estimated through waist circumference measurements...
October 2016: Childhood Obesity
Zhumin Zhang, Mary J Lindstrom, Philip M Farrell, HuiChuan J Lai
BACKGROUND: To examine long-term growth benefit of newborn screening (NBS), adolescent peak height velocity (PHV), and adult height were compared between the screened (diagnosed early via NBS) and the control (identified generally by symptoms) in the Wisconsin Randomized Clinical Trial. METHODS: Data from 107 children born in 1985-1994 and followed through 2012 were analyzed. PHV was estimated by a semiparametric growth curve model and compared with Tanner reference...
May 2016: Pediatrics
Fátima Baptista, Lurdes M Rebocho, Graça Cardadeiro, Vera Zymbal, Nicoletta Rosati
Boys usually have higher values of bone mineral density measured by dual-energy X-ray absorptiometry than girls, but contradictorily also have a greater incidence of fractures during growth. The purpose of this study was to investigate sex- and maturity-related differences in bone speed of sound (SoS) at the radius and tibia in a sample of 625 healthy children aged 10-14 y and to analyze the contributions of physical activity (PA) to possible dissimilarities. Radial and tibial SoS was evaluated by quantitative ultrasound, maturity was estimated as the years of distance from the peak height velocity age, and PA was assessed by accelerometry...
September 2016: Ultrasound in Medicine & Biology
Ricardo R Agostinete, Kyle R Lynch, Luís A Gobbo, Manoel Carlos Spiguel Lima, Igor H Ito, Rafael Luiz-de-Marco, Mario A Rodrigues-Junior, Romulo A Fernandes
The objective of this study was to analyze the effect of different sports on bone mineral density (BMD) accrual among male adolescents during a 9-mo follow-up. The sample was composed of 82 boys (control [n = 13], basketball [n = 14], karate [n = 9], soccer [n = 18], judo [n = 12], and swimming [n = 16]) who were followed up for 9 mo (from October 2013 to August 2014). BMD (gram per square centimeter) was assessed at baseline and follow-up using a dual-energy X-ray absorptiometry scanner, whereas somatic maturation was estimated through the use of the peak height velocity...
July 2016: Journal of Clinical Densitometry
Pantelis T Nikolaidis, Konstantinos Gkoudas, Jose Afonso, Vicente Clemente-Suarez, Beat Knechtle, Stavros Kasabalis, Athanasios Kasabalis, Helen Douda, Savvas Tokmakidis, Gema Torres-Luque
BACKGROUND: The aim of the present study was to examine the relationship of vertical jump (Abalakov jump, AJ) with anthropometric and physiological parameters in youth elite female volleyball players. METHODS: Seventy-two selected volleyball players from the region of Athens (age 13.3±0.7 yrs, body mass 62.0±7.2 kg, height 171.5±5.7 cm, body fat 21.2±4.5%), classified into quartiles according to AJ performance (group A, 21.4-26.5 cm; group B, 26.8-29.9 cm; group C, 30...
May 3, 2016: Journal of Sports Medicine and Physical Fitness
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