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Peak height velocity

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https://www.readbyqxmd.com/read/28062981/body-size-from-birth-through-adolescence-in-relation-to-risk-of-benign-breast-disease-in-young-women
#1
Catherine S Berkey, Bernard Rosner, Rulla M Tamimi, Walter C Willett, Martha Hickey, Adetunji Toriola, A Lindsay Frazier, Graham A Colditz
PURPOSE: Body size, from birth throughout adulthood, is associated with breast cancer risk, but few studies have investigated early-life body size and benign breast disease (BBD), a well-established breast cancer risk factor. We consider whether prenatal factors and size at birth, 10, 18 year, and intervening growth, are related to BBD risk. METHODS: The Growing Up Today Study includes 9032 females who completed questionnaires annually from 1996 to 2001, then 2003, 2005, 2007, 2010, and 2013...
January 6, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/28054492/match-running-performance-and-skill-execution-improves-with-age-but-not-the-number-of-disposals-in-young-australian-footballers
#2
Paul B Gastin, Christie Tangalos, Lorena Torres, Sam Robertson
This study investigated age-related differences in maturity, physical and functional characteristics and playing performance in youth Australian Football (AF). Young male players (n = 156) were recruited from 12 teams across 6 age groups (U10-U15) of a recreational AF club. All players were tested for body size, maturity and fitness. Player performance was assessed during a match in which disposals (kicks and handballs) and their effectiveness were coded from a video recording and match running performance measured using Global Positioning System...
January 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28031761/physiological-responses-during-the-time-limit-at-100-of-the-peak-velocity-in-the-carminatti-s-test-in-futsal-players
#3
Leandro Teixeira Floriano, Juliano Fernandes da Silva, Anderson Santiago Teixeira, Paulo Cesar do Nascimento Salvador, Naiandra Dittrich, Lorival José Carminatti, Lucas Loyola Nascimento, Luiz Guilherme Antonacci Guglielmo
The aim of this study was to investigate the physiological responses during the time limit at the intensity of the peak velocity of the Carminatti's test (T-CAR). Ten professional futsal players (age, 27.4 ± 5.8 years, body mass, 78.8 ± 8.5 kg, body height, 175.8 ± 6.8 cm, body fat mass, 14.1 ± 2.6%) took part in the study. The players performed three tests, with an interval of at least 48 hours, as follows: the T-CAR to determine the peak velocity and the maximal heart rate; an incremental treadmill protocol to determine the maximal physiological responses; and a time limit running test at the peak velocity reached in the T-CAR...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28026207/impact-sports-and-bone-fractures-among-adolescents
#4
Kyle R Lynch, Han C G Kemper, Bruna Turi-Lynch, Ricardo R Agostinete, Igor H Ito, Rafael Luiz-De-Marco, Mario A Rodrigues-Junior, Rômulo A Fernandes
The objective of the present study was to investigate the effects of different sports on stress fractures among adolescents during a 9-month follow-up period. The sample was composed of 184 adolescents divided into three groups (impact sports [n = 102]; swimming [n = 35]; non-sports [n = 47]). The occurrence of stress fracture was reported by participants and coaches. As potential confounders we considered age, sex, resistance training, body composition variables and age at peak of height velocity. There were 13 adolescents who reported fractures during the 9-month period...
December 27, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27999718/the-effects-of-instrument-assisted-soft-tissue-mobilization-on-lower-extremity-muscle-performance-a-randomized-controlled-trial
#5
Nicole MacDonald, Russell Baker, Scott W Cheatham
BACKGROUND: Instrument-Assisted Soft Tissue Mobilization (IASTM) is a non-invasive therapeutic technique used to theoretically aid in scar tissue breakdown and absorption, fascial mobilization, and improved tissue healing. Researchers have hypothesized that utilizing IASTM will improve muscular efficiency and performance; yet previous Investigations has been focused on treating injury. OBJECTIVE: The purpose of this investigation was to explore the effects of IASTM on muscle performance to assess if typical treatment application affected measures of muscular performance...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27973380/reference-data-for-jumping-mechanography-in-canadian-children-adolescents-and-young-adults
#6
L Gabel, H M Macdonald, L Nettlefold, D Race, H A McKay
OBJECTIVES: To provide age- and sex-specific reference data for mechanography-derived parameters of muscle function in Canadian children and youth using the single two-legged jump (S2LJ) with hands-on-waist. METHODS: Our sample included 2017 observations from 715 participants (9-21 years; 338 girls). Participants performed three S2LJ with hands-on-waist on a force platform (Leonardo Mechanograph, Novotec). Outcomes were maximum peak power (Pmax), Pmax/mass, peak force/body weight (Fmax/BW), force efficiency, maximum jump height (Hmax), and velocity (Vmax)...
December 14, 2016: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/27966039/magnetic-resonance-tissue-phase-mapping-demonstrates-altered-left-ventricular-diastolic-function-in-children-with-chronic-kidney-disease
#7
Charlotte Gimpel, Bernd A Jung, Sabine Jung, Johannes Brado, Daniel Schwendinger, Barbara Burkhardt, Martin Pohl, Katja E Odening, Julia Geiger, Raoul Arnold
BACKGROUND: Echocardiographic examinations have revealed functional cardiac abnormalities in children with chronic kidney disease. OBJECTIVE: To assess the feasibility of MRI tissue phase mapping in children and to assess regional left ventricular wall movements in children with chronic kidney disease. MATERIALS AND METHODS: Twenty pediatric patients with chronic kidney disease (before or after renal transplantation) and 12 healthy controls underwent tissue phase mapping (TPM) to quantify regional left ventricular function through myocardial long (Vz) and short-axis (Vr) velocities at all 3 levels of the left ventricle...
December 13, 2016: Pediatric Radiology
https://www.readbyqxmd.com/read/27941173/long-term-response-to-growth-hormone-therapy-in-a-patient-with-short-stature-caused-by-a-novel-heterozygous-mutation-in-npr2
#8
Gabriela A Vasques, Alfonso Hisado-Oliva, Mariana F A Funari, Antonio M Lerario, Elisangela P S Quedas, Paulo Solberg, Karen E Heath, Alexander A L Jorge
BACKGROUND: Heterozygous loss-of-function mutations in the natriuretic peptide receptor B gene (NPR2) are responsible for short stature in patients without a distinct phenotype. Some of these patients have been treated with recombinant human growth hormone (rhGH) therapy with a variable response. CASE PRESENTATION: The proband was a healthy boy who presented at the age of 5.1 years with familial short stature (height SDS of -3.1). He had a prominent forehead, a depressed nasal bridge, centripetal fat distribution and a high-pitched voice resembling that of children with GH deficiency...
January 1, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/27934120/accurate-drift-time-determination-by-traveling-wave-ion-mobility-spectrometry-the-concept-of-the-diffusion-calibration
#9
Christopher Kune, Johann Far, Edwin De Pauw
Ion mobility spectrometry (IMS) is a gas phase separation technique, which relies on differences in collision cross section (CCS) of ions. Ionic clouds of unresolved conformers overlap if the CCS difference is below the instrumental resolution expressed as CCS/ΔCCS. The experimental arrival time distribution (ATD) peak is then a superimposition of the various contributions weighted by their relative intensities. This paper introduces a strategy for accurate drift time determination using traveling wave ion mobility spectrometry (TWIMS) of poorly resolved or unresolved conformers...
December 6, 2016: Analytical Chemistry
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
#10
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 body mass index (BMI) at IP and AR and later weight status. SUBJECTS AND METHODS: In 4744 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 (Identification and Prevention of Dietary- and Lifestyle-Induced Health Effects in Children and Infants)/I...
December 20, 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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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...
January 2017: 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
#19
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 separation approach over another. Here we present a plotting approach more appropriate for determining how to use chromatography most efficiently in one's own laboratory...
December 6, 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
#20
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
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