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Peak velocity height

Sylvia Moeskops, Jon L Oliver, Paul J Read, John B Cronin, Gregory D Myer, G Gregory Haff, Rhodri S Lloyd
To investigate the within- and between-session reliability of the isometric mid-thigh pull (IMTP) in pre- and post-peak height velocity (PHV) female athletes. Nineteen pre- and nineteen post-PHV athletes performed bilateral IMTPs using a custom-designed isometric testing system. Participants attended three separate testing-sessions, and performed three trials within each session. Peak force, relative peak force, force at 30, 50, 90, 100, 150, 200, and 250 milliseconds, rate of force development (RFD) within time-specific bands, time to peak force (TPF), and time to peak rate of force development (TPRFD) were obtained for analysis...
March 15, 2018: Journal of Strength and Conditioning Research
Karsten Königstein, Denis Infanger, Christopher Klenk, Timo Hinrichs, Anja Rossmeissl, Sandra Baumann, Benjamin Hafner, Henner Hanssen, Arno Schmidt-Trucksäss
BACKGROUND AND AIMS: Higher cardiorespiratory fitness is associated with lower pulse wave velocity and arterial stiffness in normal weight individuals, and this has not been examined in obese individuals. It is unclear whether an altered body composition acts as a modifier of the association between cardiorespiratory fitness and arterial stiffness. We examined the association between peak oxygen uptake and brachial-ankle pulse wave velocity and analysed whether body composition attenuates this association in obese middle-aged individuals...
March 8, 2018: Atherosclerosis
David Bender, Jeremy R Townsend, William Vantrease, Autumn C Marshall, Ruth N Henry, Stephen Heffington, Kent D Johnson
The purpose of this study was to examine the effects of acute beetroot juice (BR) administration on repeated sprint performance and isometric force production in adolescent males. Twelve male adolescents (16.8 ± 1.0 yrs; 178.8 ± 9.2 cm; 74.8 ± 12.5 kg; peak height velocity: 2.53 ± 1.2 yrs) participated in this double-blind, placebo-controlled, crossover designed study. Participants consumed 2 x 70 mL of BR (~12.9 mmol NO3¯; Beet It Sport®) or a nitrate-depleted placebo (PL) 2.5 hours prior to performing isometric mid-thigh pulls (IMTP) and four repeated 20-second Wingate sprints (S1-S4) interspersed with 4 minutes of rest...
March 10, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Gregory J Tierney, Christopher Richter, Karl Denvir, Ciaran K Simms
There is mounting evidence of reduced long-term cognitive ability in rugby players, even in those without a reported history of concussion. The tackle height law is an area of controversy. However, little is known about the effects of repetitive inertial head loading in rugby. Furthermore, the magnitude and influencing factors for head kinematics are generally unknown. In this exploratory study, 45 multibody front-on shoulder tackles simulated with the MADYMO pedestrian model and 20 staged rugby tackles executed by professional rugby players in a marker-based 3D motion laboratory were used to assess the effect of tackle height on ball carrier head kinematics...
February 27, 2018: Journal of Biomechanics
Sumana Chatterjee, Lucy Shapiro, Stephen J Rose, Talat Mushtaq, Peter E Clayton, Svetlana Ten, Amrit Bhangoo, Uma Kumbattae, Renuka Dias, Martin O Savage, Louise A Metherell, Helen L Storr
BACKGROUND: Patients with homozygous intronic pseudoexon GH receptor(GHR) mutations(6Ψ) have growth hormone Insensitivity(GHI) (growth failure, IGF1 deficiency and normal/elevated serum GH). We report 9 patients in addition to previously described 11 GHR 6Ψ patients and their responses to rhIGF1 therapy. METHODS: 20 patients (12 males, 11 families, mean age 4.0±2.2yrs) were diagnosed genetically in our centre. Phenotypic data and responses to rhIGF1 treatment were provided by referring clinicians...
March 2, 2018: European Journal of Endocrinology
Elham Z Movassagh, Adam D G Baxter-Jones, Saija Kontulainen, Susan Whiting, Michael Szafron, Hassan Vatanparast
BACKGROUND: The amount of bone accrued during adolescence is an important determinant of later osteoporosis risk. Little is known about the influence of dietary patterns (DPs) on the bone during adolescence and their potential long-term implications into adulthood. We examined the role of adolescent DPs on adolescent and young adult bone and change in DPs from adolescence to young adulthood. METHODS: We recruited participants from the Saskatchewan Pediatric Bone Mineral Accrual Study (1991-2011)...
February 28, 2018: Nutrition Journal
Mark De Ste Croix, Abigail Priestley, Rhodri Lloyd, Jon Oliver
PURPOSE: Fatigue negatively alters dynamic knee control, and the functional hamstring/quadriceps ratio (H/QFUNC ) plays an important role in stabilizing the joint. The aim of this study was to investigate the influence of soccer-specific exercise on H/QFUNC in under (U) 13-, U15-, and U17-year-old female soccer players. METHODS: A total of 36 female players performed concentric and eccentric actions of the hamstrings at 60°, 120°, and 180°/s before and after an age group-specific field-based soccer protocol...
February 27, 2018: Pediatric Exercise Science
Manuel J Coelho-E-Silva, Ricardo Rebelo-Gonçalves, Diogo Martinho, Alexis Ahmed, Leonardo G O Luz, João P Duarte, Vítor Severino, Rafael C Baptista, João Valente-Dos-Santos, Vasco Vaz, Rui S Gonçalves, Antonio Tessitore, António J Figueiredo
The current study aimed to examine the reproducibility of estimated peak power and estimated pedal velocity in a multi-trial 10-s all-out cycling test among adult athletes (n = 22; aged 23.50±4.73 years). Stature, sitting height and body mass were measured. Leg length was estimated as stature minus sitting height. Body volume was obtained from air displacement plethysmography and was subsequently used to calculate body density. Fat mass and fat-free mass were derived. The short-term power outputs were assessed from the force-velocity test (FVT), using a friction-braked ergometer on two separated occasions...
2018: PloS One
Mellissa Harden, Alex Wolf, Mark Russell, Kirsty M Hicks, Duncan French, Glyn Howatson
High intensity eccentric exercise is a potent stimulus for neuromuscular adaptation. A greater understanding of the mechanical stimuli afforded by this exercise will aid the prescription of future eccentric training regimes. This study sought to investigate the mechanical characteristics of supramaximally loaded eccentric exercise when using a custom-built leg press machine. Using a within subject, repeated measures design, 15 strength trained subjects (age 31 ± 7 years; height 180.0 ± 6.8 cm; body mass 81...
February 20, 2018: Journal of Strength and Conditioning Research
Mariana Del Pino, Virginia Fano, Paula Adamo
BACKGROUND: Achondroplasia is the most common form of inherited disproportionate short stature. Cross-sectional design studies of height show that, during childhood, height standard deviation scores (SDS) declines steadily and reaches a mean adult height at -6.42 and -6.72 SDS. However, there is a lack of knowledge about longitudinal growth and biological variables during puberty for children with achondroplasia. Here we report the growth velocity and biological parameters during puberty in children with achondroplasia...
February 21, 2018: Journal of Pediatric Endocrinology & Metabolism: JPEM
Heita Goto, John G Morris, Mary E Nevill
The aim of this study was to examine the influence of biological maturity on match performance in elite youth male soccer players. The participants were 80 Premier League Academy outfield players (8-16 years old). Biological maturity was determined by calculating estimated chronological age at peak height velocity. The U9 and U10 squads played 6-a-side and the U11-U16 squads played 11-a-side inter-academy matches. All matches were analyzed using a 1 Hz Global Positioning System (SPI elite, GPSport, Australia) with squad specific speed zones which were calculated based on 5 m flying sprint speed in the last 5 m of 10 m sprint test...
February 14, 2018: Journal of Strength and Conditioning Research
M R Garcia, A D Nicholson, A M Nduaguba, J O Sanders, R W Liu, D R Cooperman
Purpose: There are multiple skeletal maturity grading systems, but none of them utilizes the phalanges of the foot. To minimize radiation, it would be ideal if one could assess the skeletal maturity of a foot based on bones seen on routine foot radiographs, if guided growth is being considered as a treatment option. We developed a system that correlates changes of the appearance of the foot phalanges to peak height velocity (PHV) and the recently described calcaneal apophyseal ossification grading system...
February 1, 2018: Journal of Children's Orthopaedics
A D Nicholson, J O Sanders, R W Liu, D R Cooperman
Purpose: We investigate the thenar and plantar sesamoids as markers of skeletal maturity, and grade appearance using two scales, a binary system (absent or present), and an analogue system that relies upon judging regular changes in morphological appearance. Methods: We studied 94 healthy children (49 female and 45 male patients) between ages three and 18 years who had approximately 700 serially acquired sets of radiographs and physical examinations. The children had at least annual radiographs taken of the left hand and left foot...
February 1, 2018: Journal of Children's Orthopaedics
Emile S Farag, Pim van Ooij, R Nils Planken, Kayleigh C P Dukker, Frederiek de Heer, Berto J Bouma, Danielle Robbers-Visser, Maarten Groenink, Aart J Nederveen, Bas A J M de Mol, Jolanda Kluin, S Matthijs Boekholdt
BACKGROUND: Use of 4-dimensional flow magnetic resonance imaging (4D-flow MRI) derived wall shear stress (WSS) heat maps enables identification of regions in the ascending aorta with increased WSS. These regions are subject to dysregulation of the extracellular matrix and elastic fiber degeneration, which is associated with aortic dilatation and dissection. PURPOSE: To evaluate the effect of the presence of aortic valve stenosis and the aortic diameter on the peak WSS and surface area of increased WSS in the ascending aorta...
February 16, 2018: Journal of Magnetic Resonance Imaging: JMRI
Haruna Katayama, Takeshi Matsumoto, Hideo Wada, Naoki Fujimoto, Junki Toyoda, Yasunori Abe, Kohshi Ohishi, Yoshiki Yamashita, Makoto Ikejiri, Koji Habe, Naoyuki Katayama
The usefulness of the waveform of activated partial thromboplastin time (APTT) in various diseases has been evaluated in recent years. The APTT waveform was examined in patients with hemophilia and patients positive for lupus anticoagulant (LA). The correlation with the FVIII activity was highest for the height of acceleration peak. The peak time of acceleration, velocity, and ½ fibrin formation, and the width of acceleration and velocity were significantly long and the height of acceleration was significantly low in patients with hemophilia...
January 1, 2018: Clinical and Applied Thrombosis/hemostasis
Jackie D Zehr, Danielle R Carnegie, Timothy N Welsh, Tyson A C Beach
PURPOSE: To compare the effects of object handled and handgrip used on lumbar spine motion and loading during occupational lifting task simulations. METHODS: Eight male and eight female volunteers performed barbell and crate lifts with a pronated (barbell) and neutral (crate) handgrip. The mass of barbells/crates lifted was identical across the objects and fixed at 11.6 kg and 9.3 kg for men and women, respectively. The initial heights of barbells/crates were individualized to mid-shank level...
February 13, 2018: International Journal of Occupational Safety and Ergonomics: JOSE
Qing Ye, Jun Cheng, Wangbiao Guo, Junchen Xu, Ke Li, Junhu Zhou
A novel serial lantern-shaped draft tube (LDT) that generates vortices is proposed to increase radial velocity between dark and light regions for improving CO2 fixation with microalgae in a gas-lift circumflux column (GCC) photobioreactor. Clockwise vortices are generated in the downflow outerloop of the GCC photobioreactor with LDT. Radial velocity was improved from 1.50 to 4.35 × 10-2 m/s, thereby decreased liquid cycle period between dark and light regions by 1.9 times. Mixing time decreased by 21%, and mass transfer coefficient increased by 26% with LDT...
January 31, 2018: Bioresource Technology
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study examined the post-activation potentiation (PAP) response of two conditioning activities (CA), the hexbar deadlift (HBD) and back squat (BS), combined with accommodating resistance; this adds a percentage of the total resistance during the exercise. Twenty amateur rugby league players performed two experimental trials and a control trial without a CA. Participants performed a countermovement jump (CMJ) before and 30, 90, and 180 seconds after one set of three repetitions of each CA at 70% 1 repetition maximum (RM), with up to an additional 23% 1RM from accommodating resistance...
February 1, 2018: Journal of Strength and Conditioning Research
Jason Pui Yin Cheung, Prudence Wing Hang Cheung, Dino Samartzis, Keith Dip-Kei Luk
BACKGROUND: Determining the peak growth velocity of a patient with adolescent idiopathic scoliosis (AIS) is important for timely treatment to prevent curve progression. It is important to be able to predict when the curve-progression risk is greatest to maximize the benefits of any intervention for AIS. The distal radius and ulna (DRU) classification has been shown to accurately predict skeletal growth. However, its utility in predicting curve progression and the rate of progression in AIS is unknown...
February 2018: Clinical Orthopaedics and related Research
Vipul Gupta, Parvez Mahbub, Pavel N Nesterenko, Brett Paull
A new polymer flow-cell for chemiluminescence detection (CLD) has been designed and developed by diverging multiple linear channels from a common centre port in a radial arrangement. The fabrication of radial flow-cell by 3D PolyJet printing and fused deposition modeling (FDM) has been evaluated, and compared with a similarly prepared spiral flow-cell design commonly used in chemiluminescence detectors. The radial flow-cell required only 10 h of post-PolyJet print processing time as compared to ca. 360 h long post-PolyJet print processing time required for the spiral flow-cell...
April 16, 2018: Analytica Chimica Acta
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