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Peak velocity height

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https://www.readbyqxmd.com/read/27899810/potential-selection-effects-when-estimating-associations-between-the-infancy-peak-or-adiposity-rebound-and-later-body-mass-index-in-children
#1
C Börnhorst, A Siani, M Tornaritis, D Molnár, L Lissner, S Regber, L Reisch, A De Decker, L A Moreno, W Ahrens, I Pigeot
INTRODUCTION: This study aims to evaluate a potential selection effect caused by exclusion of children with non-identifiable infancy peak (IP) and adiposity rebound (AR) when estimating associations between age and BMI at IP and AR and later weight status. SUBJECTS AND METHODS: In 4 744 children with at least 4 repeated measurements of height and weight in the age interval from 0 to 8 years (37 998 measurements) participating in the IDEFICS/I.Family cohort study, fractional polynomial multi-level models were used to derive individual BMI trajectories...
November 30, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27893479/complex-training-the-effect-of-exercise-selection-and-training-status-on-post-activation-potentiation-in-rugby-league-players
#2
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study compared the post-activation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and ten amateur rugby league players performed two experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14 and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1RM of either HBD or BS. A force platform determined peak power output (PPO), force at PPO, velocity at PPO and jump height of each CMJ...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27861464/pubertal-height-gain-is-inversely-related-to-peak-bmi-in-childhood
#3
Anton Holmgren, Aimon Niklasson, Andreas F M Nierop, Lars Gelander, A Stefan Aronson, Agneta Sjöberg, Lauren Lissner, Kerstin Albertsson-Wikland
BackgroundChildhood BMI may influence subsequent growth in height as well as the timing of puberty. The aim of the present study was to investigate associations between BMI in childhood and subsequent height gain/pubertal growth.MethodsLongitudinal growth data were used (GrowUp1990 Gothenburg cohort, n=1901). The QEPS growth-model was used to characterize height gain in relation to the highest BMISDS value between 3.5 and 8 years of age. Children were defined as overweight/obese (OwOb) or normal weight/underweight (NwUw), using the 2012 International Obesity Task Force criteria...
November 18, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27849118/acute-effects-of-different-aerobic-exercise-duration-on-pulse-wave-velocity-in-healthy-young-men
#4
Ryota Kobayashi, Hiroyuki Hatakeyama, Yuto Hashimoto, Takanobu Okamoto
BACKGROUND: The purpose of present study was to determine the acute effects of different aerobic exercise duration on pulse wave velocity (PWV) in healthy young men. METHODS: One week after measuring peak oxygen uptake to determine the duration of each exercise trial, 11 healthy males (age: 23.4 ± 0.6 years, height: 172.5 ± 2.3 cm, weight: 64.1 ± 2.4 kg) cycled on an ergometer for 15 (15 min-EX), 30 (30 min-EX) and 45 (45 min-EX) min at 65% peak oxygen uptake in random order...
November 16, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27843491/3d-strength-surfaces-for-ankle-plantar-and-dorsi-flexion-in-healthy-adults-an-isometric-and-isokinetic-dynamometry-study
#5
Sara J Hussain, Laura Frey-Law
BACKGROUND: The ankle is an important component of the human kinetic chain, and deficits in ankle strength can negatively impact functional tasks such as balance and gait. While peak torque is influenced by joint angle and movement velocity, ankle strength is typically reported for a single angle or movement speed. To better identify deficits and track recovery of ankle strength after injury or surgical intervention, ankle strength across a range of movement velocities and joint angles in healthy adults is needed...
2016: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/27836627/what-is-the-most-accurate-and-reliable-methodological-approach-for-predicting-peak-height-velocity-in-adolescents-a-systematic-review
#6
REVIEW
Kathryn Mills, Donovan Baker, Verity Pacey, Martin Wollin, Michael K Drew
OBJECTIVES: To identify the most accurate method of predicting peak height velocity in adolescents. DESIGN: Systematic review. METHODS: A comprehensive literature search of six electronic databases and reference lists was conducted. Studies that met selection criteria of (1) observational longitudinal cohort study (2) reproducible method/s of predicting peak height velocity (3) minimum six-month follow-up (4) healthy male and/or female adolescent subjects, with the exception of participants with adolescent idiopathic scoliosis, were considered for review...
October 29, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27832016/curve-progression-risk-in-a-mixed-series-of-braced-and-nonbraced-patients-with-idiopathic-scoliosis-related-to-skeletal-maturity-assessment-on-the-olecranon
#7
Yann Philippe Charles, Federico Canavese, Alain Diméglio
We aimed to determine the curve progression risk of idiopathic scoliosis in patients at the time of peak height velocity by plotting curve magnitudes against olecranon stages of skeletal maturation. Register data of 372 patients with juvenile or adolescent idiopathic scoliosis followed at 6-month intervals from onset of scoliosis to skeletal maturity were reviewed. At the onset of the pubertal growth spurt, curves greater than 30° have a 100% risk of progressing over 45° (P<0.0001). Curves 21-30° have a progression risk of 72...
November 9, 2016: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/27827803/is-calcaneal-broadband-ultrasound-attenuation-a-valid-index-of-dual-energy-x-ray-absorptiometry-derived-bone-mass-in-children
#8
B K Weeks, R Hirsch, R C Nogueira, B R Beck
OBJECTIVES: The aim of the current study was to assess whether calcaneal broadband ultrasound attenuation (BUA) can predict whole body and regional dual-energy x-ray absorptiometry (DXA)-derived bone mass in healthy, Australian children and adolescents at different stages of maturity. METHODS: A total of 389 boys and girls across a wide age range (four to 18 years) volunteered to participate. The estimated age of peak height velocity (APHV) was used to classify children into pre-, peri-, and post-APHV groups...
November 2016: Bone & Joint Research
https://www.readbyqxmd.com/read/27793062/variation-in-responses-to-sprint-training-in-male-youth-athletes-a-meta-analysis
#9
J Moran, G Sandercock, M C Rumpf, D A Parry
The trainability of youths and the existence of periods of accelerated adaptation to training have become key subjects of debate in exercise science. The purpose of this meta-analysis was to characterise youth athletes' adaptability to sprint training across PRE-, MID-, and POST-peak height velocity (PHV) groups. Effect sizes were calculated as a measure of straight-line sprinting performance with studies qualifying based on the following criteria: (a) healthy male athletes who were engaged in organised sports; (b) groups of participants with a mean age between 10 and 18 years; (c) sprint training intervention duration between 4 and 16 weeks...
October 28, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27790917/graphical-method-for-choosing-optimized-conditions-given-a-pump-pressure-and-a-particle-diameter-in-liquid-chromatography
#10
Stephen R Groskreutz, Stephen G Weber
The general limitations on liquid chromatographic performance in isocratic and gradient elution are now well understood. Many workers have contributed to this understanding and to developing graphical methods, or plots, to illustrate the capabilities of chromatographic systems over a wide range of values of operational parameters. These have been invaluable in getting a picture, in broad strokes, about the value of changing an operational parameter or the value of one separations approach over another. Here we present a plotting approach more appropriate for determining how to use chromatography most efficiently in one's own laboratory...
October 28, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27749733/acute-effects-of-lateral-thigh-foam-rolling-on-arterial-tissue-perfusion-determined-by-spectral-doppler-and-power-doppler-ultrasound
#11
Hotfiel T, Swoboda B, Krinner S, Grim C, Engelhardt M, Uder M, Hei R
Foam rolling has been developed as a popular intervention in training and rehabilitation. However, evidence on its effects on the cellular and physiological level is lacking. The aim of this study was to assess the effect of foam rolling on arterial blood flow of the lateral thigh. Twenty-one healthy participants (age 25 ± 2 years, height 177 ± 9 cm, body weight 74 ± 9 kg) were recruited from the medical and sports faculty. Arterial tissue perfusion was determined by spectral Doppler and power Doppler ultrasound, represented as peak flow (Vmax), time average velocity maximum (TAMx), time average velocity mean (TAMn), and resistive index (RI), and with semiquantitative grading that was assessed by four blind-folded investigators...
September 23, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27743496/being-born-large-for-gestational-age-is-associated-with-earlier-pubertal-take-off-and-longer-growth-duration-a-longitudinal-study
#12
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 I...
October 15, 2016: Acta Paediatrica
https://www.readbyqxmd.com/read/27736289/acute-effects-of-foam-rolling-static-stretching-and-dynamic-stretching-during-warm-ups-on-muscular-flexibility-and-strength-in-young-adults
#13
Hsuan Su, Nai-Jen Chang, Wen-Lan Wu, Lan-Yuen Guo, I-Hua Chu
CONTEXT: Foam rolling has been proposed to improve muscle function, performance, and joint range of motion (ROM). However, whether a foam rolling protocol can be adopted as a warm-up to improve flexibility and muscle strength is unclear. OBJECTIVE: To examine and compare the acute effects of foam rolling, static stretching, and dynamic stretching used as part of warm-up on flexibility and muscle strength of knee flexion and extension. DESIGN: Crossover study...
October 13, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27709655/elevated-serum-homocysteine-level-as-an-independent-risk-factor-for-erectile-dysfunction-a-prospective-pilot-case-control-study
#14
Z Zhang, Z Xu, Y Dai, Y Chen
Homocysteine is an amino acid that is produced from the metabolic demethylation of dietary methionine. It has gained arising attention for its association with increased risk of myocardial infarction, stroke and venous thromboembolism. Erectile dysfunction (ED), especially for vasculogenic ED, is a vascular disorder of cavernosal vascular bed. In this prospective pilot case-control study, we investigated plasma homocysteine levels in 32 ED patients and 20 healthy control men. Related patients characteristics including age, weight, height, marital status, smoking and drinking status, level of education were collected and analysed as well as penile colour Doppler ultrasound parameters...
October 6, 2016: Andrologia
https://www.readbyqxmd.com/read/27663764/the-countermovement-jump-to-monitor-neuromuscular-status-a-meta-analysis
#15
João Gustavo Claudino, John Cronin, Bruno Mezêncio, Daniel Travis McMaster, Michael McGuigan, Valmor Tricoli, Alberto Carlos Amadio, Julio Cerca Serrão
OBJECTIVES: The primary objective of this meta-analysis was to compare countermovement jump (CMJ) performance in studies that reported the highest value as opposed to average value for the purposes of monitoring neuromuscular status (i.e., fatigue and supercompensation). The secondary aim was to determine the sensitivity of the dependent variables. DESIGN: Systematic review with meta-analysis. METHODS: The meta-analysis was conducted on the highest or average of a number of CMJ variables...
August 25, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27650913/long-bone-robustness-during-growth-a-cross-sectional-pqct-examination-of-children-and-young-adults-aged-5-29years
#16
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
https://www.readbyqxmd.com/read/27642859/the-effect-of-game-design-goal-type-and-player-numbers-on-the-physiological-and-physical-demands-of-hurling-specific-small-sided-games
#17
Shane Malone, Kieran Collins
The current study examined the effect that game design modification, goal type and player numbers on the running performance and physiological demands of small-sided hurling games (SSG). Forty-eight hurling players (age 25.5 ± 3.2 years; height 178.9 ± 3.2 cm; body mass 78.5 ± 4.5 kg) performed four types of SSG (possession (P), normal play (NP), regular Goals (RG) and small goals (SG) in four-a-side, five-a-side and six-a-side formats. Heart rate (Polar Electro Oy, Kempele, Finland) and Global positioning system technology (VX Sport, 4-Hz, Lower Hutt, New Zealand) were used to analyse the physical and physiological differences between SSG...
September 6, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27628681/relationships-between-childhood-growth-parameters-and-adult-blood-pressure-the-fels-longitudinal-study
#18
R T Sabo, A Wang, Y Deng, C S Sabo, S S Sun
Previous research has shown that childhood body size is associated with blood pressure in adulthood, and that early and rapid growth rates are correlated with adverse cardiovascular outcomes. Our objectives are to estimate associations between childhood body size growth parameters and adult blood pressure, and to examine the effect of early attainment of critical growth milestones on adult blood pressure, relative to normal or late attainment. Lifetime height and body mass index (BMI) measurements in childhood, and systolic blood pressure (SBP) and diastolic blood pressure (DBP) measurements in adulthood are taken from participants in the Fels Longitudinal Study...
September 15, 2016: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/27618715/understanding-the-mismatch-between-coaches-and-players-perceptions-of-exertion
#19
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
https://www.readbyqxmd.com/read/27617076/detection-of-early-right-ventricular-dysfunction-in-young-patients-with-thalassemia-major-using-tissue-doppler-imaging
#20
Helen Bornaun, Reyhan Dedeoglu, Kazim Oztarhan, Savas Dedeoglu, Erkan Erfidan, Muge Gundogdu, Gonul Aydogan, Dicle Cengiz
BACKGROUND: Myocardial iron overload is the most common cause of mortality in patients with thalassemia major (TM), also known as beta-thalassemia. T2* cardiovascular magnetic resonance imaging (MRI) is the best way of monitoring cardiac iron, and new echocardiographic techniques can be used to assess cardiac function. OBJECTIVES: The aim of this study was to assess the systolic and diastolic right ventricular (RV) function of patients with TM using tissue Doppler imaging (TDI) and to determine whether this echocardiographic technique is an adequate diagnostic tool for the screening and detection of subclinical cardiac dysfunction...
June 2016: Iranian Journal of Pediatrics
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