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https://www.readbyqxmd.com/read/27918658/countermovement-jump-phase-characteristics-of-senior-and-academy-rugby-league-players
#1
John J McMahon, Shannon Murphy, Sophie J E Rej, Paul Comfort
PURPOSE: Gross measures of countermovement jump (CMJ) performance are commonly used to track maturational changes in neuromuscular function within rugby league (RL). The purpose of this study was to conduct both a gross and a more detailed temporal phase analysis of the CMJ performances of senior and academy RL players, to provide greater insight into how neuromuscular function differs between these groups. METHODS: Twenty senior and fourteen academy (under-19) male RL players performed three maximal effort CMJs on a force platform with forward dynamics subsequently employed to allow gross performance measures and entire kinetic and kinematic-time curves to be compared between groups...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27916268/extended-dissipative-state-estimation-for-uncertain-discrete-time-markov-jump-neural-networks-with-mixed-time-delays
#2
Qian Li, Qingxin Zhu, Shouming Zhong, Fuli Zhong
This paper is concerned with the problem of extended dissipativity-based state estimation for uncertain discrete-time Markov jump neural networks with finite piecewise homogeneous Markov chain and mixed time delays. The aim of this paper is to present a Markov switching estimator design method, which ensures that the resulting error system is extended stochastically dissipative. A triple-summable term is introduced in the constructed Lyapunov function and the reciprocally convex approach is utilized to bound the forward difference of the triple-summable term...
December 1, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27904796/functional-hop-tests-and-tuck-jump-assessment-scores-between-female-division-i-collegiate-athletes-participating-in-high-versus-low-acl-injury-prone-sports-a-cross-sectional-analysis
#3
Philipp Hoog, Meghan Warren, Craig A Smith, Nicole J Chimera
BACKGROUND: Although functional tests including the single leg hop (SLH), triple hop (TH), cross over hop (COH) for distance, and the tuck jump assessment (TJA) are used for return to play (RTP) criteria for post anterior cruciate ligament (ACL) injury, sport-specific baseline measurements are limited. PURPOSE: The purpose of this study was to examine differences in SLH, TH, and COH distance and limb symmetry index (LSI), as well as total scores, number of jumps, and individual flaws of the TJA in 97 injury-free Division I (DI) collegiate female student athletes participating in ACL injury prone vs...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27806003/fitness-profiles-of-elite-adolescent-irish-rugby-union-players
#4
Daniel J Wood, Garrett Coughlan, Eamonn Delahunt
Rugby unions throughout the world are implementing player development models in order to prepare young players to meet the demands of professional rugby union. An example of this is the Irish Rugby Football Union Long Term Player Development model. The purpose of the present study was to provide normative data relating to the physical fitness of elite adolescent Irish rugby union players and determine the differences in the physical capacities between players in the forward and back units, as well as providing descriptive data for the position categorizations within these units for this unique population...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27789035/the-effect-of-increasing-strength-and-approach-velocity-on-triple-jump-performance
#5
Sam J Allen, M R Fred Yeadon, Mark A King
The triple jump is an athletic event comprising three phases in which the optimal phase ratio (the proportion of each phase to the total distance jumped) is unknown. This study used a planar whole body torque-driven computer simulation model of the ground contact parts of all three phases of the triple jump to investigate the effect of strength and approach velocity on optimal performance. The strength and approach velocity of the simulation model were each increased by up to 30% in 10% increments from baseline data collected from a national standard triple jumper...
October 19, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27764544/association-of-plasma-25-hydroxyvitamin-d-with-physical-performance-in-physically-active-children
#6
Ikram Bezrati, Raouf Hammami, Mohamed Kacem Ben Fradj, Domenico Martone, Johnny Padulo, Moncef Feki, Anis Chaouachi, Naziha Kaabachi
Vitamin D is thought to regulate skeletal muscle function and boost physical performance. The aim of this study was to assess the relationship between vitamin D and physical performance in physically active children. This cross-sectional study included 125 children who practice football as a leisure activity. Plasma 25-hydroxyvitamin D (25-OHD) was assessed using a chemiluminescence immunoassay method. Vitamin D inadequacy was defined as 25-OHD < 20 ng/mL. Physical performance testing included measurements of muscle strength (maximal isometric contraction), jumping ability (vertical jump, standing broad jump, triple hop test), linear sprint (10 m and 20 m), and agility (9 × 4-m shuttle run)...
July 13, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27740500/an-improved-result-on-dissipativity-and-passivity-analysis-of-markovian-jump-stochastic-neural-networks-with-two-delay-components
#7
Gnaneswaran Nagamani, Thirunavukkarasu Radhika, Quanxin Zhu
In this paper, we investigate the dissipativity and passivity of Markovian jump stochastic neural networks involving two additive time-varying delays. Using a Lyapunov-Krasovskii functional with triple and quadruple integral terms, we obtain delay-dependent passivity and dissipativity criteria for the system. Using a generalized Finsler lemma (GFL), a set of slack variables with special structure are introduced to reduce design conservatism. The dissipativity and passivity criteria depend on the upper bounds of the discrete time-varying delay and its derivative are given in terms of linear matrix inequalities, which can be efficiently solved through the standard numerical software...
October 10, 2016: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/27698148/multiscale-implementation-of-infinite-swap-replica-exchange-molecular-dynamics
#8
Tang-Qing Yu, Jianfeng Lu, Cameron F Abrams, Eric Vanden-Eijnden
Replica exchange molecular dynamics (REMD) is a popular method to accelerate conformational sampling of complex molecular systems. The idea is to run several replicas of the system in parallel at different temperatures that are swapped periodically. These swaps are typically attempted every few MD steps and accepted or rejected according to a Metropolis-Hastings criterion. This guarantees that the joint distribution of the composite system of replicas is the normalized sum of the symmetrized product of the canonical distributions of these replicas at the different temperatures...
October 18, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27437712/prolonged-use-of-kinesiotaping-does-not-enhance-functional-performance-and-joint-proprioception-in-healthy-young-males-randomized-controlled-trial
#9
Igor Magalhães, Martim Bottaro, João R Freitas, Jake Carmo, João P C Matheus, Rodrigo L Carregaro
OBJECTIVES: The aim of this study was to investigate the effects of continuous (48-hour) use of Kinesiotaping (KT) on functional and proprioceptive performance in healthy, physically active men. METHOD: Twenty-six healthy, physically active men (21.8±2.2 years old) were randomly allocated into two groups: 1) Kinesiotaping group (KG, tape applied with 40% tension for rectus femoris activation); 2) Control (CG, tape applied over rectus femoris without additional tension)...
March 18, 2016: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/27391410/change-of-direction-ability-in-young-elite-soccer-players-determining-factors-vary-with-angle-variation
#10
Mehdi Rouissi, Moktar Chtara, Adam Owen, Angus Burnett, Karim Chamari
BACKGROUND: The ability to change direction is considered of paramount importance in team sports. Currently there is a lack of consensus regarding the most important physical factors that determine change of direction (COD) ability. Therefore, the aim of this study was to examine the relationship strength and explosive power. METHODS: 31 young elite soccer players (mean±SD, age=17.4±0.6year, height=177±0.5cm; leg length=96.9±3.3cm, body-mass=69.0±6.2kg) were recruited...
July 8, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27144955/sequencing-effects-of-balance-and-plyometric-training-on-physical-performance-in-youth-soccer-athletes
#11
Raouf Hammami, Urs Granacher, Issam Makhlouf, David G Behm, Anis Chaouachi
Hammami, R, Granacher, U, Makhlouf, I, Behm, DG, and Chaouachi, A. Sequencing effects of balance and plyometric training on physical performance in youth soccer athletes. J Strength Cond Res 30(12): 3278-3289, 2016-Balance training may have a preconditioning effect on subsequent power training with youth. There are no studies examining whether the sequencing of balance and plyometric training has additional training benefits. The objective was to examine the effect of sequencing balance and plyometric training on the performance of 12- to 13-year-old athletes...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27100316/difference-in-agility-strength-and-flexibility-in-competitive-figure-skaters-based-on-level-of-expertise-and-skating-discipline
#12
Lindsay V Slater, Melissa Vriner, Peter Zapalo, Kat Arbour, Joseph M Hart
Slater, LV, Vriner, M, Zapalo, P, Arbour, K, and Hart, JM. Difference in agility, strength, and flexibility in competitive figure skaters based on level of expertise and skating discipline. J Strength Cond Res 30(12): 3321-3328, 2016-Figure skating is an extremely difficult sport that requires a combination of grace, artistry, flexibility, speed, and power. Although many skaters are involved with strength and conditioning programs, there is no current information about differences in off-ice performance measures based on skating discipline and level...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27097322/compromised-vitamin-d-status-negatively-affects-muscular-strength-and-power-of-collegiate-athletes
#13
Rachel A Hildebrand, Bridget Miller, Aric Warren, Deana Hildebrand, Brenda J Smith
Increasing evidence indicates that compromised vitamin D status, as indicated by serum 25-hydroxyvitamin D (25-OH D), is associated with decreased muscle function. The purpose of this study was to determine the vitamin D status of collegiate athletes residing in the southern U.S. and its effects on muscular strength and anaerobic power. Collegiate athletes (n=103) from three separate NCAA athletic programs were recruited for the study. Anthropometrics, vitamin D and calcium intake, and sun exposure data were collected along with serum 25-OH D and physical performance measures (Vertical Jump Test, Shuttle Run Test, Triple Hop for Distance Test and the 1 Repetition Maximum Squat Test) to determine the influence of vitamin D status on muscular strength and anaerobic power...
August 24, 2016: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/27056690/worse-self-reported-outcomes-but-no-limitations-in-performance-based-measures-in-patients-with-long-standing-hip-and-groin-pain-compared-with-healthy-controls
#14
Tobias Wörner, Haraldur B Sigurðsson, Anders Pålsson, Ioannis Kostogiannis, Eva Ageberg
PURPOSE: This study aimed to evaluate patient-reported outcomes as well as lower extremity and trunk muscle function in patients with long-standing hip and groin pain, in comparison with matched, healthy controls. It was hypothesized that patients with long-standing hip and groin pain would report more deficiency on the Copenhagen Hip and Groin Outcome Score (HAGOS) and have worse outcomes on performance-based measures than healthy controls. METHODS: Nineteen patients with long-standing hip and groin pain and 19 healthy, activity level-, age-, gender-, and weight-matched controls were assessed with the HAGOS for self-reported outcomes, and a parallel squat (w/kg), single-leg triple jump (cm), single-leg rise (n), barbell roll-out (% of height), and plank test (s) for performance-based measures...
April 7, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27007020/prolonged-use-of-kinesiotaping-does-not-enhance-functional-performance-and-joint-proprioception-in-healthy-young-males-randomized-controlled-trial
#15
Igor Magalhães, Martim Bottaro, João R Freitas, Jake Carmo, João P C Matheus, Rodrigo L Carregaro
Objectives The aim of this study was to investigate the effects of continuous (48-hour) use of Kinesiotaping (KT) on functional and proprioceptive performance in healthy, physically active men. Method Twenty-six healthy, physically active men (21.8±2.2 years old) were randomly allocated into two groups: 1) Kinesiotaping group (KG, tape applied with 40% tension for rectus femoris activation); 2) Control (CG, tape applied over rectus femoris without additional tension). Subjects attended the laboratory on five separate occasions: 1) familiarization; 2) baseline measurement without tape (BL); 3) immediately post-tape application (T0); 4) 24h (T24); and 5) 48h (T48) post-tape application...
March 18, 2016: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/26895356/influence-of-children-s-foot-type-on-their-physical-motor-performance
#16
Juan Francisco Arévalo-Mora, Maria Reina-Bueno, Pedro V Munuera
BACKGROUND: This cross-sectional study aimed to determine whether normal, flat, or high-arched feet corresponded to better performance of certain motor tests in children. METHODS: One hundred eighty-seven children (mean ± SD age, 11.15 ± 1.24 years) were recruited and divided into three groups: 96 with normal feet, 54 with high-arched feet, and 37 with low-arched feet. Nine motor trials were selected to assess motor performance: standing long jump, standing triple jump from each foot, standing vertical jump, shuttle run 10 × 5 m, standing-start 20-m sprint, static balance, dynamic balance on a beam of an inverted gym bench, and agility circuit...
January 2016: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/26796417/optimisation-of-phase-ratio-in-the-triple-jump-using-computer-simulation
#17
Sam J Allen, Mark A King, M R Fred Yeadon
The triple jump is an athletic event comprising three phases in which the optimal proportion of each phase to the total distance jumped, termed the phase ratio, is unknown. This study used a whole-body torque-driven computer simulation model of all three phases of the triple jump to investigate optimal technique. The technique of the simulation model was optimised by varying torque generator activation parameters using a Genetic Algorithm in order to maximise total jump distance, resulting in a hop-dominated technique (35...
April 2016: Human Movement Science
https://www.readbyqxmd.com/read/26703915/the-effect-of-a-motor-skills-training-program-in-the-improvement-of-practiced-and-non-practiced-tasks-performance-in-children-with-developmental-coordination-disorder-dcd
#18
Faiçal Farhat, Ines Hsairi, Hamza Baati, B C M Smits-Engelsman, Kaouthar Masmoudi, Radhouane Mchirgui, Chahnez Triki, Wassim Moalla
The purpose of the present study was to examine the effect of a group-based task oriented skills training program on motor and physical ability for children with DCD. It was also investigated if there was an effect on fine motor and handwriting tasks that were not specifically practiced during the training program. Forty-one children aged 6-10years took part in this study. Children were assigned to three groups: an experimental training group consisting of 14 children with DCD, a control non-training group consisted of 13 children with DCD and a control non-training group consisting of 14 typically developed children...
April 2016: Human Movement Science
https://www.readbyqxmd.com/read/26490640/identification-of-preferred-landing-leg-in-athletes-previously-injured-and-uninjured-a-brief-report
#19
Kevin R Ford, Laura C Schmitt, Timothy E Hewett, Mark V Paterno
BACKGROUND: The preferred or dominant limb is often subjectively defined by self-report. The purpose was to objectively classify preferred landing leg during landing in athletes previously injured and uninjured. METHODS: Subjects with a history of anterior cruciate ligament reconstruction (n=101) and uninjured controls (n=57) participated. Three trials of a drop vertical jump were collected. Leg dominance was defined as the leg used to kick a ball while landing leg preference was calculated as the leg which landed first during landing trials...
January 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/26434025/kinematic-dynamic-and-emg-analysis-of-drop-jumps-in-female-elite-triple-jump-athletes
#20
Milan Čoh, Zlatko Matjačić, Stanislav Peharec, Petar Bačić, Nikola Rausavjević, Krzysztof Maćkala
The purpose of the study was a biodynamic analysis of the kinematic, dynamic and EMG parameters of two types of drop jumps (heights of 25 cm and 45 cm). The sample of measured subjects included four female elite triple jump athletes, with their best results varying from 13.33 to 15.06 meters. The kinematic and dynamic parameters were calculated with the use of a bipedal tensiometric force plate, which was synchronized with nine CCD cameras. A 16-channel electromyography (BTS Pocket, Myolab) was used to analyze the EMG activation of the following muscles: m...
July 2015: Collegium Antropologicum
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