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Sports competition and performance

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https://www.readbyqxmd.com/read/28319679/evaluation-of-body-composition-with-bioimpedence-a-comparison-between-athletic-and-non-athletic-children
#1
Domenico Meleleo, Nicola Bartolomeo, Liliana Cassano, Alessandro Nitti, Giovanna Susca, Giuseppina Mastrototaro, Umberto Armenise, Annapaola Zito, Fiorella Devito, Pietro Scicchitano, Marco Matteo Ciccone
PURPOSE: Conventional Bioelectrical Impedance Analysis (BIA) or Bioelectrical Impedance Vector Analysis (BIVA) can provide direct evaluations of body composition. The purpose of this study was to evaluate lean and fat mass (FM), and hydration of children involved in daily competitive sports. METHODS: 190 non-athletic [8.2-10.5 years] and 29 competitive children [8.0-10.5 years] were enrolled. They were evaluated: at baseline (t0), 6 months (t1) and one year (t2)...
March 20, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28316263/individualised-dietary-strategies-for-olympic-combat-sports-acute-weight-loss-recovery-and-competition-nutrition
#2
Reid Reale, Gary Slater, Louise M Burke
Olympic combat sports separate athletes into weight divisions, in an attempt to reduce size, strength, range and/or leverage disparities between competitors. Official weigh-ins are conducted anywhere from 3 and up to 24 h prior to competition ensuring athletes meet weight requirements (i.e. have 'made weight'). Fighters commonly aim to compete in weight divisions lower than their day-to-day weight, achieved via chronic and acute manipulations of body mass (BM). Although these manipulations may impair health and absolute performance, their strategic use can improve competitive success...
March 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28291764/delayed-effects-of-a-low-volume-power-type-resistance-exercise-session-on-explosive-performance
#3
Athanasios Tsoukos, Panagiotis Veligekas, Lee E Brown, Gerasimos Terzis, Gregory C Bogdanis
This study examined the delayed effects of a power type training session on explosive performance. Seventeen well-trained male power and team sport athletes (age: 22.7±5.5 y, height: 181±8 cm, body mass: 80.7±8.6 kg, body fat: 9.2±1.7 %, 1-RM half-squat: 163±29 kg) performed four sessions (2 experimental and 2 control) one week apart in a randomized and counterbalanced order. Explosive performance was assessed before, 24 and 48 h following a low-volume, power-type training session (5 x 4 jump squats at 40% 1RM with 3 min rest), as well as before and after 24 and 48 h of rest (control)...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28287684/the-value-of-sleep-on-athletic-performance-injury-and-recovery-in-the-young-athlete
#4
Elizabeth A Copenhaver, Alex B Diamond
Adequate sleep can easily become compromised as student-athletes try to balance the multiple demands on their time. People with sleep deficiency are at increased risk for acute illnesses, traumatic sports injuries, and development of chronic diseases. Training sessions or competitions during extremely early or late hours can interfere with circadian and homeostatic rhythms. Adjusting the training schedule to improve sleep duration has a significantly positive impact on several aspects of athletic performance...
March 1, 2017: Pediatric Annals
https://www.readbyqxmd.com/read/28282752/discovering-frequently-recurring-movement-sequences-in-team-sport-athlete-spatiotemporal-data
#5
Alice J Sweeting, Robert J Aughey, Stuart J Cormack, Stuart Morgan
Athlete external load is typically analysed from predetermined movement thresholds. The combination of movement sequences and differences in these movements between playing positions is also currently unknown. This study developed a method to discover the frequently recurring movement sequences across playing position during matches. The external load of 12 international female netball athletes was collected by a local positioning system during four national-level matches. Velocity, acceleration and angular velocity were calculated from positional (X, Y) data, clustered via one-dimensional k-means and assigned a unique alphabetic label...
February 9, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28280975/the-effect-of-nordic-hamstring-strength-training-on-muscle-architecture-stiffness-and-strength
#6
Kayla D Seymore, Zachary J Domire, Paul DeVita, Patrick M Rider, Anthony S Kulas
PURPOSE: Hamstring strain injury is a frequent and serious injury in competitive and recreational sports. While Nordic hamstring (NH) eccentric strength training is an effective hamstring injury-prevention method, the protective mechanism of this exercise is not understood. Strength training increases muscle strength, but also alters muscle architecture and stiffness; all three factors may be associated with reducing muscle injuries. The purpose of this study was to examine the effects of NH eccentric strength training on hamstring muscle architecture, stiffness, and strength...
March 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28261142/gender-differences-in-motor-skills-of-the-overarm-throw
#7
Michael Gromeier, Dirk Koester, Thomas Schack
In this cross-sectional study, the qualitative and quantitative throwing performance of male and female athletes (6 to 16 years of age) was analyzed. The goal of this study was to assess whether there were gender based qualitative and quantitative differences in throwing performance of young athletes, throughout three different age bands (childhood, pubescence, and adolescence). Furthermore, we explored whether all components of the throwing movement are equally affected by gender differences. Focus was placed on five essential components of action: trunk, forearm, humerus, stepping, and backswing...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28253031/the-relationship-between-training-load-and-injury-in-men-s-professional-basketball-players
#8
Kaitlyn J Weiss, Sian V Allen, Mike R McGuigan, Chris S Whatman
PURPOSE: To establish the relationship between the acute:chronic workload ratio and lower extremity overuse injuries in professional basketball players over the course of a competitive season. METHODS: The acute:chronic workload ratio was determined by calculating the sum of the current week's session rate of perceived exertion (sRPE) training load (acute load) and dividing it by the average weekly training load over the previous four weeks (chronic load). All injuries were recorded weekly using a self-reported injury questionnaire (Oslo Sports Trauma Research Centre Injury Questionnaire(20)) Workload ratios were modelled against injury data using a logistic regression model with unique intercepts for each player...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28231435/impact-of-a-competition-with-two-consecutive-matches-in-a-day-on-physical-performance-in-young-tennis-players
#9
Cesar Gallo-Salazar, Juan Del Coso, David Barbado, Alejandro Lopez-Valenciano, Francisco Javier Santos-Rosa, David Sanz-Rivas, Manuel Moya, Jaime Fernandez-Fernandez
The purpose of this study was to analyze the effects of playing two tennis matches on the same day on physical performance in young tennis players. Twelve well-trained young tennis players took part in a simulated tennis competition consisting of two tennis matches on the same day (morning and afternoon sessions). Before and the day after the competition, physical performance was measured using a battery of countermovement jumps (CMJ), a 10-m sprint, the 5-0-5 agility test, hip, grip and shoulder maximal isometric strength, shoulder range of motion (ROM) and a serve velocity test...
February 23, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28228697/influence-of-posture-cuing-shirt-on-tennis-serve-kinematics-in-division-iii-tennis-players
#10
Joseph Zappala, Carolina Orrego, Emily Boe, Heather Fechner, Derek Salminen, Daniel J Cipriani
OBJECTIVE: The purpose of this study was to evaluate the influence of a posture-cuing shirt on internal rotation velocity of the shoulder during a tennis swing and to determine this influence on shoulder external rotation position. METHODS: Nine healthy competitive college tennis players from a Division III college participated in this study. High-speed motion capture allowed for 3-dimensional analysis of shoulder kinematics during a tennis serve. Two conditions were evaluated while the athletes performed a high-velocity tennis serve: a standard tennis shirt and a posture-cuing shirt...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28222049/optimal-load-and-power-spectrum-during-jerk-and-back-jerk-in-competitive-weightlifters
#11
Francisco Javier Flores, Silvia Sedano, Juan C Redondo
Flores, FJ, Sedano, S, and Redondo, JC. Optimal load and power spectrum during jerk and back jerk in competitive weightlifters. J Strength Cond Res 31(3): 809-816, 2017-Although the ability to develop high levels of power is considered as a key component of success in many sporting activities, the optimal load (Pmax load) that maximizes power output (Pmax) remains controversial mainly during weightlifting movements. The aim of the present study was to determine Pmax load and optimal power spectrum (OPS) required to elicit Pmax by comparing jerk and back jerk exercises in competitive weightlifters...
March 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28219598/physical-activity-among-organ-recipients-data-collected-from-the-latin-american-transplant-games
#12
A N Atamañuk, J P Ortiz Fragola, M Casonu, C Lirio, V Graziano, F Cicora
BACKGROUND: Cardiovascular complications after transplantation are an important cause of non-transplant-related deaths. Depression and anxiety are not unusual among organ recipients. Physical activity reduces cardiovascular risk and promotes a sensation of well-being. The aims of the study were to examine how exercise affects psychological well-being sensation in organ recipients and to describe the physician's role in promoting and controlling safe sport training in transplanted patients...
March 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28219093/-impact-of-vitamin-d-in-sports-does-vitamin-d-insufficiency-compromise-athletic-performance
#13
Sebastian Butscheidt, Tim Rolvien, Peter Ueblacker, Michael Amling, Florian Barvencik
Introduction Vitamin D is essential for calcium homeostasis and regulates the expression of over 900 genes. It thereby influences musculoskeletal health and function. Additionally, multiple other effects were observed through the detection of vitamin D receptors (VDR) in numerous tissues of the human body. Material and Methods We reviewed the literature regarding evidence of the impact of vitamin D on musculoskeletal health and peak athletic performance. Results and Discussion It is well known that there is a high prevalence of vitamin D deficiency in the average European population...
February 20, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28214966/anomalous-coronary-arteries-and-myocardial-bridges-risk-stratification-in-children-using-novel-cardiac-catheterization-techniques
#14
Hitesh Agrawal, Silvana Molossi, Mahboob Alam, S Kristen Sexson-Tejtel, Carlos M Mery, E Dean McKenzie, Charles D Fraser, Athar M Qureshi
The evaluation of the vast majority of children with anomalous aortic origin of a coronary artery (AAOCA) and/or myocardial bridges is performed with non-invasive testing. However, a subset of these patients may benefit from invasive testing for risk stratification. All patients included in the Coronary Anomalies Program (CAP) at Texas Children's Hospital who underwent cardiac catheterization were included. Techniques included selective coronary angiograms (SCA), intravascular ultrasound (IVUS), and fractional flow reserve (FFR) measurements with provocative testing using adenosine and/or dobutamine infusions...
February 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28210349/a-comparison-of-serve-speed-and-motor-coordination-between-elite-and-club-level-tennis-players
#15
Mustafa Söğüt
The purpose of this study was to compare the serve speed and motor coordination of elite and club level junior tennis players aged 11-14 years. Participants (n=35) were assigned to one of the two groups according to their experience, weekly training volume and competition level. Serve speed was assessed with a sports radar gun. Motor coordination was evaluated by means of the Körperkoordinationstest für Kinder. The main results revealed that serve speed and motor coordination performance levels of the elite group were significantly higher than those of the club group...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28197801/team-sports-performance-analysed-through-the-lens-of-social-network-theory-implications-for-research-and-practice
#16
João Ribeiro, Pedro Silva, Ricardo Duarte, Keith Davids, Júlio Garganta
This paper discusses how social network analyses and graph theory can be implemented in team sports performance analyses to evaluate individual (micro) and collective (macro) performance data, and how to use this information for designing practice tasks. Moreover, we briefly outline possible limitations of social network studies and provide suggestions for future research. Instead of cataloguing discrete events or player actions, it has been argued that researchers need to consider the synergistic interpersonal processes emerging between teammates in competitive performance environments...
February 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28195976/self-reported-measures-of-strength-and-sport-specific-skills-distinguish-ranking-in-an-international-online-fitness-competition
#17
Paul R Serafini, Yuri Feito, Gerald T Mangine
To determine if self-reported performance measures could distinguish ranking during the 2016 CrossFit Open, data from three thousand male (n=1500; 27.2±8.4 y; 85.2±7.9 kg; 177.0±6.5 cm) and female (n=1500, 28.7±4.9 y; 63.7±5.8 kg; 163.7±6.6 cm) competitors was used for this study. Competitors were split by gender and grouped into quintiles (Q1-Q5) based upon their final ranking. Quintiles were compared for one-repetition maximum (1RM) squat, deadlift, clean and jerk (CJ), snatch, 400-m sprint, 5,000-m run, and benchmark workouts (Fran, Helen, Grace, Filthy-50, and Fight-gone-bad)...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28194734/physical-and-physiological-profiles-of-brazilian-jiu-jitsu-athletes-a-systematic-review
#18
REVIEW
Leonardo Vidal Andreato, Francisco Javier Díaz Lara, Alexandro Andrade, Braulio Henrique Magnani Branco
BACKGROUND: Brazilian jiu-jitsu is a grappling combat sport that has intermittency as its core element; in other words, actions of high, moderate and low intensity are interspersed during matches, requiring a high level of conditioning to support optimal levels of performance for the total match time. The athletes perform from four to six matches during a day of competition, and this number may increase if the open-class competition, which is held parallel to the competition by weight class, is considered...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28186497/agility-in-young-athletes-is-it-a-different-ability-from-speed-and-power
#19
Yassine Negra, Helmi Chaabene, Mehréz Hammami, Samiha Amara, Senda Sammoud, Bessem Mkaouer, Younés Hachana
Negra, Y, Chaabene, H, Hammami, M, Amara, S, Sammoud, S, Mkaouer, B, and Hachana, Y. Agility in young athletes: is it a different ability from speed and power? J Strength Cond Res 31(3): 727-735, 2017-Agility is an important physical attribute for successful participation in team sports events. Illinois agility test (IAT) and T-test have been widely used within adult team sports players to assess agility performance. The purposes of this investigation are (a) to study the reliability and the sensitivity of both IAT and T-test scores and (b) to explore to what extend the agility is an independent physical ability from speed time and jumping ability...
March 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28181208/individual-environment-interactions-in-swimming-the-smallest-unit-for-analysing-the-emergence-of-coordination-dynamics-in-performance
#20
Brice Guignard, Annie Rouard, Didier Chollet, John Hart, Keith Davids, Ludovic Seifert
Displacement in competitive swimming is highly dependent on fluid characteristics, since athletes use these properties to propel themselves. It is essential for sport scientists and practitioners to clearly identify the interactions that emerge between each individual swimmer and properties of an aquatic environment. Traditionally, the two protagonists in these interactions have been studied separately. Determining the impact of each swimmer's movements on fluid flow, and vice versa, is a major challenge. Classic biomechanical research approaches have focused on swimmers' actions, decomposing stroke characteristics for analysis, without exploring perturbations to fluid flows...
February 8, 2017: Sports Medicine
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