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Peak velocity height

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https://www.readbyqxmd.com/read/29327129/quantification-of-osteoblastic-activity-in-epiphyseal-growth-plates-by-quantitative-bone-spect-ct
#1
Tomohiko Yamane, Ichiei Kuji, Akira Seto, Ichiro Matsunari
OBJECTIVE: Quantifying the function of the epiphyseal plate is worthwhile for the management of children with growth disorders. The aim of this retrospective study was to quantify the osteoblastic activity at the epiphyseal plate using the quantitative bone SPECT/CT. MATERIALS AND METHODS: We enrolled patients under the age of 20 years who received Tc-99m hydroxymethylene diphosphonate bone scintigraphy acquired by a quantitative SPECT/CT scanner. The images were reconstructed by ordered subset conjugate-gradient minimizer, and the uptake on the distal margin of the femur was quantified by peak standardized uptake value (SUVpeak)...
January 11, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29324575/the-relationship-between-tennis-serve-velocity-and-select-performance-measures
#2
Matthew J Hayes, Dirk R Spits, David G Watts, Vincent G Kelly
The purpose of this study was to determine if there was a relationship between tennis serve speed and isometric mid-thigh pull (IMTP) kinetic variables; countermovement jump height (CMJ Height), shoulder internal and external rotation strength and anthropometric measures in elite adolescent tennis players. Twenty-one elite junior tennis players from the Tennis Australia National Academy were recruited for this study (male, n = 12, female, n = 9). Correlations between the performance variables and peak tennis serve speed were calculated using a Pearson's product-moment correlation coefficient...
January 10, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29300147/relationships-between-highly-skilled-golfers-clubhead-velocity-and-force-producing-capabilities-during-vertical-jumps-and-an-isometric-mid-thigh-pull
#3
Jack E T Wells, Andrew C S Mitchell, Laura H Charalambous, Iain M Fletcher
Whilst previous research has highlighted significant relationships between golfers' clubhead velocity (CHV) and their vertical jump height and maximum strength, these field-based protocols were unable to measure the actual vertical ground reaction force (vGRF) variables that may correlate to performance. The aim of this study was to investigate relationships between isometric mid-thigh pull (IMTP), countermovement jump (CMJ), squat jump (SJ) and drop jump (DJ) vGRF variables and CHV in highly skilled golfers...
January 4, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29277059/influence-of-handrail-height-and-fall-direction-on-center-of-mass-control-and-the-physical-demands-of-reach-to-grasp-balance-recovery-reactions
#4
Vicki Komisar, Konika Nirmalanathan, Alison C Novak
The ability to maintain and recover center of mass (COM) and trunk control after a destabilization is critical for avoiding falls and fall-related injuries. Handrails can significantly enhance a person's ability to recover from large destabilizations, by enabling the person to grasp and apply high forces to the rail to stabilize their COM. However, the influence of handrail height and falling direction on COM control and the demands of grasping are unknown. We investigated the effect of handrail height (34, 38, 42 in...
December 14, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29276855/assessing-differences-in-cardiorespiratory-fitness-with-respect-to-maturity-status-in-highly-trained-youth-soccer-players
#5
Greg Doncaster, John Iga, Viswanath Unnithan
PURPOSE: The purpose of the study was to examine differences in measures of cardiorespiratory fitness and determinants of running economy with respect to maturity status in a group of highly trained youth soccer players. METHODS: A total of 21 highly trained youth soccer players participated in this study. On separate visits, players' peak oxygen uptake (VO2peak), running economy at 3 different speeds [8 km·h-1, 80% gaseous exchange threshold (GET), and 95% GET], and pulmonary oxygen uptake (VO2) kinetics were determined...
December 23, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29241366/accuracy-of-dental-development-for-estimating-the-pubertal-growth-spurt-in-comparison-to-skeletal-development-a-systematic-review-and-meta-analysis
#6
Marcos Av Bittencourt, Graziela O Cericato, Ademir Franco, Rafaela S Girão, Anderson Pb Lima, Luiz R Paranhos
OBJECTIVES: This study aimed to search for scientific evidence concerning the accuracy of dental development for estimating the pubertal growth spurt. METHODS: It was conducted according to the statements of PRISMA. An electronic search was performed in six databases, including the grey literature. The PICOS strategy was used to define the eligibility criteria and only observational studies were selected. RESULTS: Out of 1,416 identified citations, ten papers fulfilled the criteria and were included in this systematic review...
December 15, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29239993/hypoxia-during-resistance-exercise-does-not-affect-physical-performance-perceptual-responses-or-neuromuscular-recovery
#7
Brendan R Scott, Katie M Slattery, Dean V Sculley, Ben J Dascombe
This study aimed to determine whether performing resistance exercise in hypoxia affects markers of physical performance, perceptual responses, and neuromuscular function. Fourteen male subjects (age: 24.6 ± 2.7 yr; height: 179.7 ± 5.9 cm; body mass: 84.6 ± 11.6 kg) with >2 years resistance training experience performed moderate-load resistance exercise in two conditions; normoxia (FIO2 = 0.21) and hypoxia (FIO2 = 0.16). Resistance exercise comprised 3 sets of 10 repetitions of back squats and deadlifts at 60% of 1RM, with 60s inter-set rest...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29238730/interaction-of-pubertal-development-and-metabolic-control-in-adolescents-with-type-1-diabetes-mellitus
#8
M Plamper, B Gohlke, J Woelfle, K Konrad, T Rohrer, S Hofer, W Bonfig, K Fink, R W Holl
Background: In T1DM, delayed pubertal development and reduced final height are associated with inadequate metabolic control. Objective: To assess whether T1DM affects pubertal growth spurt and whether metabolic control during puberty is gender-related. Methods: Using a large multicentre database, longitudinal data from 1294 patients were analysed. Inclusion criteria: complete records of height and HbA1c from the age of seven to 16 years. Exclusion criteria: other significant chronic diseases and medications, T1DM duration less than three months, and initial BMI < 3rd or >97th percentile...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/29214820/weight-management-behaviors-among-mexican-american-youth-cross-sectional-variation-by-timing-of-growth-and-maturation
#9
Jennifer L Gay, Eva V Monsma, Katie Darby Hein
PURPOSE: To assess the association between growth and maturation with weight management behaviors (WMBs) among Mexican American youth. DESIGN: A cross-sectional design was used to measure timing of growth and maturation as well as WMBs. SAMPLE: Students were recruited through physical education classes in south Texas schools. The sample included 623 participants (52.3% female; 49.8% with weight ≥85th percentile) in grades 4 through 12. Students in middle school were purposely oversampled to examine questions around timing of growth and maturation...
January 1, 2017: American Journal of Health Promotion: AJHP
https://www.readbyqxmd.com/read/29196711/the-uniform-pattern-of-growth-and-skeletal-maturation-during-the-human-adolescent-growth-spurt
#10
James O Sanders, Xing Qiu, Xiang Lu, Dana L Duren, Raymond W Liu, Debbie Dang, Mariano E Menendez, Sarah D Hans, David R Weber, Daniel R Cooperman
Humans are one of the few species undergoing an adolescent growth spurt. Because children enter the spurt at different ages making age a poor maturity measure, longitudinal studies are necessary to identify the growth patterns and identify commonalities in adolescent growth. The standard maturity determinant, peak height velocity (PHV) timing, is difficult to estimate in individuals due to diurnal, postural, and measurement variation. Using prospective longitudinal populations of healthy children from two North American populations, we compared the timing of the adolescent growth spurt's peak height velocity to normalized heights and hand skeletal maturity radiographs...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29194185/does-maturity-status-affect-the-relationship-between-anaerobic-speed-reserve-and-multiple-sprints-sets-performance-in-young-soccer-players
#11
Mohamed Amin Selmi, Badriya Al-Haddabi, Mohamed Haj Yahmed, Radhouane Haj Sassi
The purpose of this study is to examine the relationship between repeated-sprint sets (RSS) performance indices and anaerobic speed reserve (ASR) in young soccer players of different maturity status. One hundred and seventy nine young male soccer players (11.1 to 17.8 years) classified as pre- (n=50), circum- (n=60), or post- (n=69) peak height velocity (PHV) performed multi-stage shuttle run test (MRST) to measure maximal aerobic speed (MAS), 30-m sprint with 10-m splits to estimate maximal anaerobic speed (MAnS), and RSS test...
November 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29177722/a-cross-sectional-study-on-the-mechanical-properties-of-the-achilles-tendon-with-growth
#12
Yasuyoshi Mogi, Suguru Torii, Yasuo Kawakami, Toshimasa Yanai
PURPOSE: This study aimed to elucidate growth pattern of mechanical properties of the Achilles tendon and to examine if imbalance between growth of bone and muscle-tendon unit occurs during adolescence. METHODS: Fourteen elementary school boys, 30 junior high school boys, 20 high school boys and 15 male adults participated in this study. Based on estimated age at peak height velocity (PHV), junior high school boys were separated into two groups (before or after PHV)...
November 24, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29175714/the-effect-of-additional-activation-of-the-plantar-intrinsic-foot-muscles-on-foot-dynamics-during-gait
#13
Kazunori Okamura, Shusaku Kanai, Masaki Hasegawa, Akira Otsuka, Sadaaki Oki
BACKGROUND: The plantar intrinsic foot muscles (PIFMs) contribute to support the medial longitudinal arch. But the functional role of the PIFMs during dynamic activities is not clear. The purpose of this study was to examine the change in the foot dynamics during gait accompanied with the change in the PIFMs activity to determine the functional role of the PIFMs during gait. METHODS: Twenty healthy male subjects were randomly assigned to the electrical stimulation group (ESG) or control group (CG)...
August 18, 2017: Foot
https://www.readbyqxmd.com/read/29172453/sample-concentration-of-charged-small-molecules-and-peptides-in-capillary-electrophoresis-by-micelle-to-cyclodextrin-stacking
#14
Joselito P Quirino, Wojciech Grochocki, Michal J Markuszewski
A stacking approach in capillary electrophoresis based on the reversal of the analytes' effective electrophoretic velocities at a dynamic stacking boundary formed between charged micelles (i.e., from long chain ionic surfactants) and neutral cyclodextrins (i.e., native λ-, β-or γ-cyclodextrin) is presented. The approach was demonstrated by the long injection of samples in a micellar solution followed by injection of a cyclodextrin solution zone, and then separation by co-electroosmotic flow capillary zone electrophoresis...
November 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29165377/a-novel-3d-pedestrian-navigation-method-for-a-multiple-sensors-based-foot-mounted-inertial-system
#15
Wei Yang, Chundi Xiu, Jianmin Zhang, Dongkai Yang
In this paper, we present a novel method for 3D pedestrian navigation of foot-mounted inertial systems by integrating a MEMS-IMU, barometer, and permanent magnet. Zero-velocity update (ZUPT) is a well-known algorithm to eliminate the accumulated error of foot-mounted inertial systems. However, the ZUPT stance phase detector using acceleration and angular rate is threshold-based, which may cause incorrect stance phase estimation in the running gait pattern. A permanent magnet-based ZUPT detector is introduced to solve this problem...
November 22, 2017: Sensors
https://www.readbyqxmd.com/read/29147571/a-surprising-treatment-response-in-a-patient-with-rare-isolated-growth-hormone-deficiency-type-ib
#16
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
#17
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/29129395/echocardiographic-nomograms-for-upper-abdominal-aorta-doppler-systolic-wave-values-and-systo-diastolic-diameters-variations-in-children
#18
Massimiliano Cantinotti, Raffaele Giordano, Iuri Corsini, Carlo Dani, Marco Scalese, Bruno Murzi, Nadia Assanta, Isabella Spadoni, Sabrina Molinaro, Shelby Kutty, Giorgio Iervasi, Eliana Franchi
BACKGROUND: Abdominal aorta pulsatility and blood flow patterns are important diagnostic indicators in congenital heart disease. Reference values for these indexes are lacking. METHODS: We prospectively studied abdominal aorta pulsed-wave Doppler systolic peak velocity, deceleration time, and wave duration, and two-dimensional vessel diameters in systole and diastole in healthy Caucasian children. Heteroscedasticity was accounted for by White or Breusch-Pagan test...
November 9, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29127942/attenuation-measurements-with-ultrasonic-diffraction-grating-show-dependence-upon-particle-size-of-slurry-and-viscosity-of-base-liquid
#19
Margaret Stautberg Greenwood
How can using an ultrasonic diffraction grating lead to slurry characterization? The diffraction grating, which is formed by machining triangular grooves on the flat surface of an aluminum unit, has send and receive transducers fastened to the unit at an angle of 30°. The ultrasonic beam strikes the back of the grating, in contact with the slurry, and reflects a beam to the receive transducer; m = 0 and m = 1 beams are transmitted into the slurry. The angle of the m = 1 beam changes with frequency and, at the critical frequency fCR, it reaches 90°...
October 5, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29113497/modelling-height-in-adolescence-a-comparison-of-methods-for-estimating-the-age-at-peak-height-velocity
#20
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
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