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Peak height velocity

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https://www.readbyqxmd.com/read/29129395/echocardiographic-nomograms-for-upper-abdominal-aorta-doppler-systolic-wave-values-and-systo-diastolic-diameters-variations-in-children
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/29076365/influence-of-trial-repetition-on-lameness-during-force-platform-gait-analysis-in-a-heterogeneous-population-of-clinically-lame-dogs-each-trotting-at-its-preferred-velocity
#4
Megan A Mickelson, Thao Vo, Alexander M Piazza, Nicola J Volstad, Brett W Nemke, Peter Muir
OBJECTIVE To determine variance effects influencing ground reaction forces (GRFs) in a heterogeneous population of lame dogs during trotting. ANIMALS 30 client-owned dogs with thoracic limb lameness and 31 dogs with pelvic limb lameness. PROCEDURES GRFs, velocity, height at the dorsal aspect of the scapulae (ie, withers), and shoulder height were obtained. Each dog was trotted across a force platform at its preferred velocity. Variance effects for 12 velocity and associated relative velocity (V*) ranges were examined...
November 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/29058111/the-effects-of-muscle-blood-flow-restriction-during-running-training-on-measures-of-aerobic-capacity-and-run-time-to-exhaustion
#5
Carl D Paton, Shalako M Addis, Lee-Anne Taylor
PURPOSE: Training with blood flow restriction (BFR) is known to enhance muscle mass and strength during resistance training activities. However, little is known about the BFR effects during aerobic training. This investigation examines the effects of running training performed with or without BFR on physiology and performance. METHOD: Sixteen subjects (age 24.9 ± 6.9 years, height 172.9 ± 7.8 cm, weight 75.1 ± 13.8 kg) were assigned to a BFR or control (CON) group for eight sessions of training...
October 20, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29045317/the-relationships-between-height-arm-length-and-leg-length-on-the-mechanics-of-the-conventional-and-high-handle-hexagonal-bar-deadlift
#6
Robert G Lockie, Matthew R Moreno, Ashley J Orjalo, Adrina Lazar, Tricia M Liu, Alyssa A Stage, Samantha A Birmingham-Babauta, John J Stokes, Dominic V Giuliano, Fabrice G Risso, DeShaun L Davis, Samuel J Callaghan
The study investigated relationships between arm (AL) and leg length (LL) and conventional deadlift (CD) and high-handle hexagonal bar deadlift (HHBD) mechanics. Twenty-three resistance-trained subjects (14 males, 9 females) completed a one-repetition maximum (1RM) CD and HHBD. A linear position transducer was used to measure: lift distance and duration; peak and mean power, velocity, and force; time to peak power and velocity; and work. Right AL and LL were measured, and AL-to-LL ratio (AL:LL) was also calculated...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29039261/one-year-follow-up-of-the-capo-kids-trial-are-physical-benefits-maintained
#7
Rossana C Nogueira, Benjamin K Weeks, Belinda Beck
PURPOSE: To determine the 12-month maintenance of a 9-month, thrice-weekly, 10-minute high-intensity exercise program, delivered in schools, on bone and other health-related performance variables in prepubertal children. METHODS: All participants (N = 311) of the CAPO kids trial (testing times T1-T2) were contacted to undergo retesting (T3) of all original measures-including weight, standing and sitting height, calcaneal broadband ultrasound attenuation (Achilles, GE), and stiffness index (Achilles, GE)-waist circumference, resting heart rate, blood pressure, vertical jump, and aerobic capacity...
October 17, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29031643/physical-fitness-and-psychological-health-in-overweight-obese-children-a-cross-sectional-study-from-the-activebrains-project
#8
M Rodriguez-Ayllon, C Cadenas-Sanchez, I Esteban-Cornejo, J H Migueles, J Mora-Gonzalez, P Henriksson, M Martín-Matillas, A Mena-Molina, P Molina-García, F Estévez-López, G M Enriquez, J C Perales, J R Ruiz, A Catena, F B Ortega
OBJECTIVES: To examine the associations of physical fitness (i.e. cardiorespiratory fitness, muscular strength, and speed/agility) with psychological distress and psychological well-being in overweight/obese pre-adolescent children. DESIGN: 110 overweight/obese children (10.0±1.1years old, 61 boys) from the ActiveBrains project (http://profith.ugr.es/activebrains) participated in this cross-sectional study. METHODS: Physical fitness was evaluated by the ALPHA battery test...
October 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28986327/anthropometrics-and-maturity-status-a-preliminary-study-of-youth-football-head-impact-biomechanics
#9
Susan W Yeargin, Payton Kingsley, Jim M Mensch, Jason P Mihalik, Eva V Monsma
CONTEXT: There is a paucity of head impact biomechanics research focusing on youth athletes. Little is known about how youth subconcussive head impact tolerances are related to physical size and maturation. OBJECTIVE: To examine the effects of age, anthropometric and maturational status variability on head impact biomechanics. DESIGN: Cross-sectional. SETTING: Outdoor youth football facilities in South Carolina. PARTICIPANTS: Thirty-four male recreational youth football players, 8 to 13yrs...
October 3, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28931173/hopping-and-landing-performance-in-male-youth-soccer-players-effects-of-age-and-maturation
#10
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Quantifying hopping and landing performances can assist coaches in identifying young male soccer players who may be at increased risk of injury. The influence of chronological age and maturation on these measures in this population is unknown. Single leg hop for distance (SLHD) and 75% horizontal hop and stick landing force (75%Hop) were examined in a cross-sectional sample (N=400) of elite male youth soccer players. Between-group differences for both chronological age (U11-U18) and stage of maturation (pre-, circa- or post-peak height velocity (PHV)) were analyzed...
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28930932/complex-training-the-effect-of-exercise-selection-and-training-status-on-postactivation-potentiation-in-rugby-league-players
#11
David J Scott, Massimiliano Ditroilo, Phil A Marshall
This study compared the postactivation 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 10 amateur rugby league players performed 2 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% 1 repetition maximum of either HBD or BS...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28912731/long-term-athletic-development-in-youth-alpine-ski-racing-the-effect-of-physical-fitness-ski-racing-technique-anthropometrics-and-biological-maturity-status-on-injuries
#12
Lisa Müller, Carolin Hildebrandt, Erich Müller, Christian Fink, Christian Raschner
Alpine ski racing is known to be a sport with a high risk of injuries. Because most studies have focused mainly on top-level athletes and on traumatic injuries, limited research exists about injury risk factors among youth ski racers. The aim of this study was to determine the intrinsic risk factors (anthropometrics, biological maturity, physical fitness, racing technique) for injury among youth alpine ski racers. Study participants were 81 youth ski racers attending a ski boarding school (50 males, 31 females; 9-14 years)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28902117/factors-influencing-spike-jump-height-in-female-college-volleyball-players
#13
Yusuke Ikeda, Yusuke Sasaki, Shingo Sorimachi, Rena Hamano
The purpose of this study was to examine factors influencing spike jump (SPJ) performance by female competitive volleyball players through comparisons of the kinematic data of SPJ with those of the standing long jump (SLJ) and vertical jump (VJ). Seventeen female competitive volleyball players were asked to perform SPJ, SLJ, and VJ. Motion data of SPJ including the approach phase were recorded. Regarding SLJ and VJ, jumping motion and ground reaction force were recorded during each performance. The results obtained showed that SPJ height correlated with vertical velocity at take-off, horizontal velocity at third step contact, and the deceleration of horizontal velocity from third step contact to take-off...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28901657/longitudinal-patterns-in-bmi-and-percent-total-body-fat-from-peak-height-velocity-through-emerging-adulthood-into-young-adulthood
#14
Erin Barbour-Tuck, Marta Erlandson, Nazeem Muhajarine, Heather Foulds, Adam Baxter-Jones
OBJECTIVES: Emerging adulthood, a potential critical period, is an understudied period of fat mass accrual. The aim of this study was to describe patterns of fat mass accrual, and weight status, from adolescence, through emerging adulthood, into young adulthood. METHODS: One-hundred-eighteen participants (59 male) were measured repeatedly for 20 years. Annual measures of height, weight, and body composition (DXA) were taken. Calculated measures included: peak height velocity (PHV), biological age (BA; years from PHV), body mass index (BMI), and percent total body fat (%TBF)...
September 13, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28895692/development-of-equations-and-proposed-reference-values-to-estimate-body-fat-mass-among-chilean-children-and-adolescents
#15
Marco Cossio-Bolaños, Miguel de Arruda, José Sulla Torres, Camilo Urra Albornoz, Rossana Gómez Campos
INTRODUCTION: The assessment of body composition is relevant to establish nutritional status and identify potential health risks. OBJETIVE: a) To develop regression equations to predict fat mass (FM) using a dual-energy X-ray absorptiometry as reference method; b) to propose reference FM values based on chronological and biological age for Chilean children and adolescents. METHODOLOGY: Cross-sectional study in children and adolescents aged 5...
October 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28895467/kinetic-and-kinematic-patterns-during-high-intensity-clean-movement-searching-for-optimal-load
#16
Achraf Ammar, Bryan L Riemann, Liwa Masmoudi, Marcel Blaumann, Osama Abdelkarim, Anita Hökelmann
The aim of the present study was to investigate loading effects on kinematic and kinetic variables among elite-weightlifters in order to identify an optimal training load to maximize power production for clean-movement. Nine elite-weightlifter (age: 24 ± 4years, body-mass: 77 ± 6.5kg, height: 176 ± 6.1cm and 1RM clean: 170 ± 5kg) performed 2 separate repetitions of the clean using 85, 90, 95% and 100%, in a randomized order, while standing on a force platform and being recorded using 3D-capture-system. Differences in kinematics (barbell displacement, velocity and acceleration) and kinetics (power, vertical ground reaction force (vGRF), rate of force development (RFD), and work) across the loads were statistically assessed...
September 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28872525/thumb-ossification-composite-index-toci-for-predicting-peripubertal-skeletal-maturity-and-peak-height-velocity-in-idiopathic-scoliosis-a-validation-study-of-premenarchal-girls-with-adolescent-idiopathic-scoliosis-followed-longitudinally-until-skeletal-maturity
#17
Alec L H Hung, W W Chau, B Shi, Simon K Chow, Fiona Y P Yu, T P Lam, Bobby K W Ng, Y Qiu, Jack C Y Cheng
BACKGROUND: Accurate skeletal maturity assessment is important to guide clinical evaluation of idiopathic scoliosis, but commonly used methods are inadequate or too complex for rapid clinical use. The objective of the study was to propose a new simplified staging method, called the thumb ossification composite index (TOCI), based on the ossification pattern of the 2 thumb epiphyses and the adductor sesamoid bone; to determine its accuracy in predicting skeletal maturation when compared with the Sanders simplified skeletal maturity system (SSMS); and to validate its interrater and intrarater reliability...
September 6, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28871900/effects-of-a-modified-ballet-class-on-strength-and-jumping-ability-in-college-ballet-dancers
#18
Aikaterini Tsanaka, Vasiliki Manou, Spiros Kellis
The ability to jump high with precision is an important component of the ballet dancer's technique. The aim of this study was to evaluate the effect of a modified ballet class on strength and jumping ability in high level female dancers. Seventeen female ballet students were divided into two groups, experimental and control, and tested before and after an 8-week, 2 times/week intervention for peak torque of knee extensors and flexors at 60°and 180°, and jumping ability (squat jump, countermovement jump, countermovement with arm swing jump, sauté in first position, and sauté in first position with port de bras)...
September 15, 2017: Journal of Dance Medicine & Science
https://www.readbyqxmd.com/read/28870146/effects-of-altering-heel-wedge-properties-on-gait-with-the-intrepid-dynamic-exoskeletal-orthosis
#19
Andrea J Ikeda, John R Fergason, Jason M Wilken
BACKGROUND: The Intrepid Dynamic Exoskeletal Orthosis is a custom-made dynamic response carbon fiber device. A heel wedge, which sits in the shoe, is an integral part of the orthosis-heel wedge-shoe system. Because the device restricts ankle movement, the system must compensate to simulate plantarflexion and allow smooth forward progression during gait. OBJECTIVES: To determine the influence of wedge height and durometer on the walking gait of individuals using the Intrepid Dynamic Exoskeletal Orthosis...
September 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28869359/monitoring-of-hemostatic-abnormalities-in-major-orthopedic-surgery-patients-treated-with-edoxaban-by-aptt-waveform
#20
M Hasegawa, H Wada, S Tone, T Yamaguchi, H Wakabayashi, M Ikejiri, M Watanabe, N Fujimoto, T Matsumoto, K Ohishi, Y Yamashita, N Katayama, A Sudo
INTRODUCTION: An analysis of the activated partial thromboplastin time (APTT) in major orthopedic surgery patients receiving edoxaban for the prevention of venous thromboembolism (VTE) was carried out. METHODS: The APTT waveform was analyzed in the above patients to monitor edoxaban administration. RESULTS: Of these 99 patients, 12 exhibited deep vein thrombosis, and 25 had massive bleeding. An increased biphasic pattern of the APTT waveform was observed after the administration of edoxaban, but there were no significant differences between the patients with and without complications...
September 4, 2017: International Journal of Laboratory Hematology
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