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Peak height velocity

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https://www.readbyqxmd.com/read/28523517/body-size-of-male-youth-soccer-players-1978-2015
#1
REVIEW
Robert M Malina, António J Figueiredo, Manuel J Coelho-E-Silva
BACKGROUND: Studies of the body size and proportions of athletes have a long history. Comparisons of athletes within specific sports across time, though not extensive, indicate both positive and negative trends. OBJECTIVE: To evaluate secular variation in heights and weights of male youth soccer players reported in studies between 1978 and 2015. METHODS: Reported mean ages, heights, and weights of male soccer players 9-18 years of age were extracted from the literature and grouped into two intervals: 1978-99 and 2000-15...
May 18, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28509763/achilles-tendon-load-is-progressively-increased-with-reductions-in-walking-speed
#2
Torsten Brauner, Philippe Pourcelot, Nathalie Crevier-Denoix, Thomas Horstmann, Scott C Wearing
INTRODUCTION: Achilles tendon rehabilitation protocols commonly recommend a gradual increase in walking speed to progressively intensify tendon loading. This study used transmission-mode ultrasound to evaluate the influence of walking speed on loading of the human Achilles tendon in vivo. METHODS: Axial transmission speed of ultrasound was measured in the right Achilles tendon of 33 adults (mean ± SD; age, 29 ± 3 years; height, 1.725 ± 0.069 m; weight, 71.4 ± 19...
May 15, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28482269/skeletal-growth-and-bone-mineral-acquisition-in-type-1-diabetic-children-abnormalities-of-the-gh-igf-1-axis
#3
REVIEW
Manish Raisingani, Brar Preneet, Brenda Kohn, Shoshana Yakar
Type 1 diabetes mellitus (T1DM) is one of the most common chronic diseases diagnosed in childhood. Childhood and adolescent years are also the most important period for growth in height and acquisition of skeletal bone mineral density (BMD). The growth hormone (GH)/insulin like growth factor -1 (IGF-1) axis which regulates growth, is affected by T1DM, with studies showing increased GH and decreased IGF-1 levels in children with T1DM. There is conflicting data as to whether adolescents with TIDM are able to achieve their genetically-determined adult height...
April 28, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/28479496/effect-of-early-life-physical-growth-on-midlife-vertebral-dimensions-the-northern-finland-birth-cohort-1966-study
#4
Petteri Oura, Markus Paananen, Marja Ojaniemi, Juha Auvinen, Juho-Antti Junno, Jaro Karppinen, Jaakko Niinimäki
Small vertebral size is an independent risk factor for osteoporotic vertebral fractures. Physical growth in early life is related to bone health in later life, but the relationship of early growth versus vertebral size has been inconclusively studied. Utilizing the Northern Finland Birth Cohort 1966 with a 47-year follow-up, we investigated how physical growth in early life is associated with midlife vertebral dimensions. We obtained several physical growth parameters of 1) birth (gestational age, length, weight, BMI), 2) infancy and childhood (peak height velocity (PHV), peak weight velocity (PWV), adiposity peak (AP), adiposity rebound (AR)), and 3) puberty (BMI at growth spurt take-off (TO), PHV, height change)...
May 4, 2017: Bone
https://www.readbyqxmd.com/read/28456838/theoretical-study-of-molecular-transport-through-a-permeabilized-cell-membrane-in-a-microchannel
#5
Masoumeh Mahboubi, Saeid Movahed, Reza Hosseini Abardeh, Vahid Hoshyargar
A two-dimensional model is developed to study the molecular transport into an immersed cell in a microchannel and to investigate the effects of finite boundary (a cell is suspended in a microchannel), amplitude of electric pulse, and geometrical parameter (microchannel height and size of electrodes) on cell uptake. Embedded electrodes on the walls of the microchannel generate the required electric pulse to permeabilize the cell membrane, pass the ions through the membrane, and transport them into the cell. The shape of electric pulses is square with the time span of 6 ms; their intensities are in the range of 2...
April 29, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28437358/integrated-multidimensional-maturity-assessments-predicting-the-high-risk-occurrence-of-peak-angle-velocity-during-puberty-in-progressive-female-idiopathic-scoliosis
#6
Benlong Shi, Saihu Mao, Leilei Xu, Xu Sun, Zezhang Zhu, Bangping Qian, Zhen Liu, Jack Chun Yiu Cheng, Yong Qiu
STUDY DESIGN: A consecutive and prospective longitudinal study. OBJECTIVE: To propose an integrated multidimensional maturity assessment that was designated as forming a reliable system precisely predicting the high-risk occurrence of peak angle velocity (PAV) in a group of progressive braced female idiopathic scoliosis (IS). SUMMARY OF BACKGROUND DATA: Scoliosis deterioration is believed to keep pace with the evolution of skeletal maturity during puberty...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28430896/evidence-of-secular-trend-in-mandibular-pubertal-growth
#7
Raphael Patcas, Daniel B Wiedemeier, Goran Markic, Philipp Beit, Heidi Keller
Background: During puberty, mandibular growth follows a growth curve comparable to somatic growth. This study aimed to review the relationship between mandibular pubertal peak height velocity (PHV) and skeletal age, and to investigate the possibility of a secular trend. Methods: Retrospective analysis was performed of two historical craniofacial growth studies (Denver Growth Study; observational time: 1943-1965, and Zurich Growth Study; observational time: 1982-1984) of healthy untreated subjects...
April 20, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28424312/archer-fish-jumping-prey-capture-kinematics-and-hydrodynamics
#8
Anna M Shih, Leah Mendelson, Alexandra H Techet
Smallscale archer fish, Toxotes microlepis, are best known for spitting jets of water to capture prey, but also hunt by jumping out of the water to heights of up to 2.5 body lengths. In this study, high-speed imaging and particle image velocimetry were used to characterize the kinematics and hydrodynamics of this jumping behavior. Jumping used a set of kinematics distinct from those of in-water feeding strikes and was segmented into three phases: (1) hovering to sight prey at the surface, (2) rapid upward thrust production and (3) gliding to the prey once out of the water...
April 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28424059/insight-into-human-pubertal-growth-by-applying-the-qeps-growth-model
#9
Anton Holmgren, Aimon Niklasson, Lars Gelander, A Stefan Aronson, Andreas F M Nierop, Kerstin Albertsson-Wikland
BACKGROUND: Computerized mathematical models describing absolute and relative individual growth during puberty in both cm and standard deviation (SD)-scores are lacking. The present study aimed to fill this gap, by applying the QEPS-model that delineates mathematically the specific pubertal functions of the total growth curve. METHODS: Study population used was the individual growth curves of the longitudinally followed cohort GrowUp1974 Gothenburg (n = 2280)...
April 19, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28416037/birth-weight-biological-maturation-and-obesity-in-adolescents-a-mediation-analysis
#10
A O Werneck, D R P Silva, P J Collings, R A Fernandes, E R V Ronque, M J Coelho-E-Silva, L B Sardinha, E S Cyrino
This study was aimed to investigate associations between birth weight and multiple adiposity indicators in youth, and to examine potential mediating effects by biological maturation. This was a school-based study involving 981 Brazilian adolescents aged between 10 and 17 years. Birth weight was reported retrospectively by mothers. Maturation was estimated by age of peak height velocity. Adiposity indicators included body mass index (BMI), waist circumference and percent body fat estimated from triceps and subscapular skinfolds...
April 18, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28401310/the-efficacy-of-periodised-resistance-training-on-neuromuscular-adaptation-in-older-adults
#11
Jenny A Conlon, Robert U Newton, James J Tufano, Luis E Peñailillo, Harry G Banyard, Amanda J Hopper, Ashley J Ridge, G Gregory Haff
PURPOSE: This study compared the effect of periodised versus non-periodised (NP) resistance training on neuromuscular adaptions in older adults. METHODS: Forty-one apparently healthy untrained older adults (female = 21, male = 20; 70.9 ± 5.1 years; 166.3 ± 8.2 cm; 72.9 ± 13.4 kg) were recruited and randomly stratified to an NP, block periodised (BP), or daily undulating periodised (DUP) training group. Outcome measures were assessed at baseline and following a 22-week resistance training intervention (3 day week(-1)), including: muscle cross-sectional area (CSA), vertical jump performance, isometric and isokinetic peak torque, isometric rate of force development (RFD), and muscle activation...
April 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28396902/progressive-skeletal-benefits-of-physical-activity-when-young-as-assessed-at-the-midshaft-humerus-in-male-baseball-players
#12
S J Warden, A M Weatherholt, A S Gudeman, D C Mitchell, W R Thompson, R K Fuchs
Physical activity benefits the skeleton, but there is contrasting evidence regarding whether benefits differ at different stages of growth. The current study demonstrates that physical activity should be encouraged at the earliest age possible and be continued into early adulthood to gain most skeletal benefits. INTRODUCTION: The current study explored physical activity-induced bone adaptation at different stages of somatic maturity by comparing side-to-side differences in midshaft humerus properties between male throwing athletes and controls...
April 10, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28394831/progression-in-youth-soccer-selection-and-identification-in-youth-soccer-players-aged-13-15-years
#13
Iraia Bidaurrazaga-Letona, José Antonio Lekue, Markos Amado, Susana Maria Gil
The aim of this study was to identify the factors which are important for the identification and selection of young soccer players. Ninety four adolescent soccer players from the Under-13 (U13; age=12.3 ± 0.3 years; n=50) and Under-15 (U15; age=14.0 ± 0.2 years; n=44) categories belonging to a professional club participated in the study. Anthropometric measurements, physical tests (sprint, agility, endurance and jump) and maturity status (age at peak height velocity) were recorded over four seasons. Comparisons were performed amongst new players joining the club (Enter players, n=15), players progressing to the next age category (Club players, n=54) and players leaving the club (Deselected players, n=25)...
April 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28387142/preece-baines-model-1-to-estimate-height-and-knee-height-growth-in-boys-and-girls-from-merida-mexico
#14
Sudip Datta Banik, Sedigheh Mirzaei Salehabadi, Federico Dickinson
BACKGROUND: Height and body segments in children have differential pubertal growth characteristics. Lower leg length is a sensitive indicator of child's nutritional status. OBJECTIVE: The purpose of this study was to estimate differential timing and tempo of height and knee height (KH) growth in 9- to 17-year-old boys (n = 475) and girls (n = 500) from Merida, Mexico. METHODS: In this cross-sectional study, the Preece-Baines growth curves-model 1 (PB 1) was fitted to the anthropometric data for height and KH...
January 1, 2017: Food and Nutrition Bulletin
https://www.readbyqxmd.com/read/28376674/effect-of-6-weeks-wbvt-on-the-behaviour-of-the-lower-limb-muscle-fibres-during-vertical-jumping
#15
Jacobo Ángel Rubio-Arias, Domingo Jesús Ramos-Campo, Paula Esteban, Fernando Martínez, José Fernando Jiménez
The purpose of the current study was to examine the effect of 6 weeks of whole body vibration training (WBVT) on body composition, muscle activity of the gastrocnemius and vastus lateralis, gastrocnemius muscle architecture (static and dynamic) and ground reaction forces (performance jump) during the take-off phase of a countermovement jump in young healthy adult males. A total of 33 men (23.31 ± 5.62 years) were randomly assigned to a whole body vibration group (experimental group, EGWBVT: n = 17; 22...
April 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28372537/a-biomechanical-comparison-of-successful-and-unsuccessful-power-clean-attempts
#16
Kristof Kipp, Carolyn Meinerz
Although the power clean is an almost ubiquitous exercise in the strength and conditioning setting, relatively little is known about the biomechanics of successful and unsuccessful power clean lift attempts. The purpose of this study was to determine biomechanical differences between successful and unsuccessful power clean lift attempts in male collegiate athletes. Fifteen male lacrosse players (Age: 20.1 ± 1.2; Height: 1.78 ± 0.07 m; Body mass: 80.4 ± 8.1 kg; Relative one-repetition maximum power clean: 1...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28355412/influence-of-work-pace-on-upper-extremity-kinematics-and-muscle-activity-in-a-short-cycle-repetitive-pick-and-place-task
#17
Tessy Luger, Svend Erik Mathiassen, Divya Srinivasan, Tim Bosch
Objectives: This study investigated the extent to which controlled changes in work pace in a cyclic pick-and-place task influence upper extremity kinematics and muscle activity, and whether an effect depends on working height. Methods: Thirteen participants performed the task for 4 min at each of five work paces ranging from 8 to 12 cycles·min-1 in each of two experimental conditions where the hand was moved horizontally with an average upper arm elevation of 30° and 50°, respectively...
February 10, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28345999/variance-associated-with-walking-velocity-during-force-platform-gait-analysis-of-a-heterogeneous-sample-of-clinically-normal-dogs
#18
Alexander M Piazza, Emily E Binversie, Lauren A Baker, Brett Nemke, Susannah J Sample, Peter Muir
OBJECTIVE To determine whether walking at specific ranges of absolute and relative (V*) velocity would aid efficient capture of gait trial data with low ground reaction force (GRF) variance in a heterogeneous sample of dogs. ANIMALS 17 clinically normal dogs of various breeds, ages, and sexes. PROCEDURES Each dog was walked across a force platform at its preferred velocity, with controlled acceleration within 0.5 m/s(2). Ranges in V* were created for height at the highest point of the shoulders (withers; WHV*)...
April 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28326606/physical-activity-sedentary-time-and-bone-strength-from-childhood-to-early-adulthood-a-mixed-longitudinal-hr-pqct-study
#19
Leigh Gabel, Heather M Macdonald, Lindsay Nettlefold, Heather A McKay
Bone strength is influenced by bone geometry, density, and bone microarchitecture, which adapt to increased mechanical loads during growth. Physical activity (PA) is essential for optimal bone strength accrual; however, less is known about how sedentary time influences bone strength and its determinants. Thus, our aim was to investigate the prospective associations between PA, sedentary time, and bone strength and its determinants during adolescence. We used HR-pQCT at distal tibia (8% site) and radius (7% site) in 173 girls and 136 boys (aged 9 to 20 years at baseline)...
March 22, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28316257/acute-kinematic-and-kinetic-adaptations-to-wearable-resistance-during-vertical-jumping
#20
Paul Macadam, Kim D Simperingham, John B Cronin, Grace Couture, Chloe Evison
One variation of vertical jump (VJ) training is resisted or weighted jump training, where wearable resistance (WR) enables jumping to be overloaded in a movement specific manner. A two-way analysis of variance with Bonferroni post hoc contrasts was used to determine the acute changes in VJ performance with differing load magnitudes and load placements. Kinematic and kinetic data were quantified using a force plate and contact mat. Twenty sport active subjects (age: 27.8 ± 3.8 years; body mass (BM): 70...
March 19, 2017: European Journal of Sport Science
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