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https://www.readbyqxmd.com/read/29683770/athletes-perceptions-of-coaching-competency-and-team-conflict-in-sport-teams-a-multilevel-analysis
#1
I González-Ponce, F M Leo, R Jiménez, D Sánchez-Oliva, H Sarmento, A Figueiredo, T García-Calvo
The purpose of this study was to examine the relationship between coaching competency and team conflict, at individual and team levels, over the season. The participants were professional female and male soccer players, who participated in the First and Second Division. A longitudinal study was performed. At Time 1, the sample of participants consisted of 581 soccer players aged between 15 and 39 years. At Time 2, 549 players were recruited from the original sample aged between 15 and 37 years. Finally, at Time 3, the sample comprised 576 players aged between 15 and 37 years...
April 23, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29667867/excelling-at-youth-level-in-competitive-track-and-field-athletics-is-not-a-prerequisite-for-later-success
#2
Philip E Kearney, Philip R Hayes
Enhancing our understanding of athlete development would be valuable for coaches, parents and administrators to set realistic performance expectations and to advance youth sport policy. To this end, a database of track and field performances was examined. Records of 134,313 performances by athletes aged between 12 and 35 years in sprinting, throwing, jumping and middle distance events were analysed. Results revealed that a minority (Male, 9%; Female, 13%) of top 20 ranked senior athletes were also ranked in the top 20 at Under 13 (U13)...
April 18, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29666879/-muscle-injuries-in-professional-football-treatment-and-rehabilitation
#3
REVIEW
H Riepenhof, R Del Vescovo, J-N Droste, S McAleer, A Pietsch
BACKGROUND: Muscle injuries are common in professional sports, especially in football. Recent epidemiological studies showed that muscle injuries account for more than 30% of professional football injuries (1.8-2.2/1000 h exposure); however, even though there are significant differences within a European comparison, a single professional football team diagnosed on average 12 muscle injuries per season, corresponding to more than 300 availability days lost. OBJECTIVE: The aim of this work is to present the diagnosis, general treatment and comprehensive management of muscle injuries in professional football...
April 17, 2018: Der Unfallchirurg
https://www.readbyqxmd.com/read/29643277/the-characteristics-of-coaches-that-verbally-or-physically-abuse-young-athletes
#4
Yutaka Yabe, Yoshihiro Hagiwara, Takuya Sekiguchi, Haruki Momma, Masahiro Tsuchiya, Kaoru Kuroki, Kenji Kanazawa, Masashi Koide, Nobuyuki Itaya, Shinichiro Yoshida, Yasuhito Sogi, Toshihisa Yano, Eiji Itoi, Ryoichi Nagatomi
Verbal or physical abuse from coaches has a negative impact on young athletes. To prevent abuse against young athletes, it is important to know the characteristics of abusive coaches. This study aimed to elucidate the characteristics of coaches who commit verbal or physical abuse in youth sports teams. A cross-sectional study was conducted with coaches of youth sport teams in Miyagi prefecture, Japan (n = 1,283), using a self-reported questionnaire (response rate was 24.0%). Multivariate logistic regression models were used for analyses...
April 2018: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29629182/psychosocial-stress-factors-including-the-relationship-with-the-coach-and-their-influence-on-acute-and-overuse-injury-risk-in-elite-female-football-players
#5
Anne Marte Pensgaard, Andreas Ivarsson, Agnethe Nilstad, Bård Erlend Solstad, Kathrin Steffen
Background: The relationship between specific types of stressors (eg, teammates, coach) and acute versus overuse injuries is not well understood. Objective: To examine the roles of different types of stressors as well as the effect of motivational climate on the occurrence of acute and overuse injuries. Methods: Players in the Norwegian elite female football league (n=193 players from 12 teams) participated in baseline screening tests prior to the 2009 competitive football season...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29627093/engineering-and-technology-in-wheelchair-sport
#6
REVIEW
Rory A Cooper, Yetsa A Tuakli-Wosornu, Geoffrey V Henderson, Eleanor Quinby, Brad E Dicianno, Kalai Tsang, Dan Ding, Rosemarie Cooper, Theresa M Crytzer, Alicia M Koontz, Ian Rice, Adam W Bleakney
Technologies capable of projecting injury and performance metrics to athletes and coaches are being developed. Wheelchair athletes must be cognizant of their upper limb health; therefore, systems must be designed to promote efficient transfer of energy to the handrims and evaluated for simultaneous effects on the upper limbs. This article is brief review of resources that help wheelchair users increase physiologic response to exercise, develop ideas for adaptive workout routines, locate accessible facilities and outdoor areas, and develop wheelchair sports-specific skills...
May 2018: Physical Medicine and Rehabilitation Clinics of North America
https://www.readbyqxmd.com/read/29619801/evaluation-of-somatotype-in-artistic-gymnastics-competitors-a-meta-analytical-approach
#7
Katarzyna Sterkowicz-Przybycien, Emanuela Gualdi-Russo
INTRODUCTION: Studies on the anthropometric characteristics of athletes have a long history, but there are no published reviews on the somatotype of artistic gymnasts. Practitioners and professional coaches can gain guidance from improved understanding of the ideal body constitution and the impact of high-intensity training since preadolescence on body build. The present review is designed to provide this information. EVIDENCE ACQUISITION: Academic Search Complete, SPORTDiscus, Medline, Google Scholar, and ResearchGate were searched in January 2017...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29618228/shoulder-and-elbow-injuries-in-soccer-goalkeepers-versus-field-players-in-the-national-collegiate-athletic-association-2009-2010-through-2013-2014
#8
Avi D Goodman, Christine Etzel, Jeremy E Raducha, Brett D Owens
OBJECTIVES: Examination of the incidence of shoulder and elbow injuries in the collegiate soccer player population is limited, as is comparison between goalkeepers and field players. We hypothesized that goalkeepers would have a higher incidence of shoulder and elbow injuries than field players. Furthermore, we sought to determine the incidence of shoulder and elbow injuries among National Collegiate Athletic Association (NCAA) soccer players, and to determine injury risk factors. METHODS: The NCAA Injury Surveillance Program database was analyzed for injuries to NCAA men's and women's soccer players during the 2009-2010 through 2013-2014 academic years...
April 4, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29609507/biomechanical-characterization-of-the-junzuki-karate-punch-indexes-of-performance
#9
Martina Rinaldi, Yasmen Nasr, Ghada Atef, Fabiano Bini, Tiwana Varrecchia, Carmela Conte, Giorgia Chini, Alberto Ranavolo, Francesco Draicchio, Francesco Pierelli, Mokhtar Amin, Franco Marinozzi, Mariano Serrao
The aims of this study were: (i) to determine kinematic, kinetic, and electromyographic characteristics of Junzuki karate punch in professional karate athletes; (ii) to identify biomechanical parameters that correlate with punch force and lead to a higher punching performance; (iii) to verify the presence of muscle co-activation in the upper limb, trunk, and lower limb muscles. Data were collected from nine experienced karatekas from the Accademia Italiana Karate e Arti Marziali during the execution of the specific punch...
April 3, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29599876/competition-field-perceptions-of-table-tennis-athletes-and-their-performance
#10
Ying-Chieh Liu, Ming-Yueh Wang, Chi-Yueh Hsu
The distinction between positive and negative perceptions is fundamental in perception models. The purpose of this study was to investigate the correlation between field perceptions of table tennis players and the outcome (net result) during the matches in a competition. Experimental data were collected from 10 elite table tennis players and analysed. The results addressed the following three competition field perceptions: (1) before the service, the player's positive perceptions had significant effect on the positive outcome (winning rate) of that service; (2) the perception after the net result of the previous service increased the positive outcome of the next service, and (3) the player's positive/negative perception during the matches affected the win/loss outcome of that competition...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599725/validity-and-reliability-of-10-hz-global-positioning-system-to-assess-in-line-movement-and-change-of-direction
#11
Pantelis T Nikolaidis, Filipe M Clemente, Cornelis M I van der Linden, Thomas Rosemann, Beat Knechtle
The objectives of the present study were to examine the validity and reliability of the 10 Hz Johan GPS unit in assessing in-line movement and change of direction. The validity was tested against the criterion measure of 200 m track-and-field (track-and-field athletes, n = 8) and 20 m shuttle run endurance test (female soccer players, n = 20). Intra-unit and inter-unit reliability was tested by intra-class correlation coefficient (ICC) and coefficient of variation (CV), respectively. An analysis of variance examined differences between the GPS measurement and five laps of 200 m at 15 km/h, and t -test examined differences between the GPS measurement and 20 m shuttle run endurance test...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29594958/change-of-direction-speed-toward-a-strength-training-approach-with-accentuated-eccentric-muscle-actions
#12
Helmi Chaabene, Olaf Prieske, Yassine Negra, Urs Granacher
There is growing evidence that eccentric strength training appears to have benefits over traditional strength training (i.e., strength training with combined concentric and eccentric muscle actions) from muscular, neuromuscular, tendinous, and metabolic perspectives. Eccentric muscle strength is particularly needed to decelerate and stabilize the body during the braking phase of a jump exercise or during rapid changes of direction (CoD) tasks. However, surprisingly little research has been conducted to elucidate the effects of eccentric strength training or strength training with accentuated eccentric muscle actions on CoD speed performance...
March 28, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29584461/case-studies-in-exercise-and-sport-sciences-a-powerful-tool-to-bridge-the-science-practice-gap
#13
Israel Halperin
Despite the progress made by the scientific exercise community in collaborating and communicating with non-scientist coaches, there is room for improvement. Coaches find research difficult to understand, feel that their interests are not being addressed by exercise research, and rely on peer-discussion to further their coaching knowledge base while consuming little peer-reviewed articles. One useful strategy to bridge the science-practice gap is with case-studies. In addition to furthering our understanding of the physiology, psychology, and training schedules of elite athletes, case studies can serve 1) as a useful communication channel with coaches if presented as narratives and 2) to establish and strengthen relationships between scientists and coaches leading to fruitful research collaborations...
March 27, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29582711/the-role-of-path-length-and-speed-related-factors-for-the-enhancement-of-section-performance-in-alpine-giant-slalom
#14
Jörg Spörri, Josef Kröll, Hermann Schwameder, Erich Müller
Knowing how to enhance alpine skiing performance is essential for effective coaching. The purpose of this study was to explore the role of path length- and speed-related factors for performance enhancement, while skiing on a homogeneously set/constantly inclined giant slalom course section (average gate distance: 27 m; offset: 8 m; slope inclination: 26°). During a video-based three-dimensional kinematic field-experiment, the data of six athletes who skied a two-gate section on four different types of skis were collected...
March 27, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29581995/role-of-rotational-kinematics-in-minimizing-elbow-varus-torques-for-professional-versus-high-school-pitchers
#15
Micheal J Luera, Brittany Dowling, Mitchel A Magrini, Tyler W D Muddle, Ryan J Colquhoun, Nathaniel D M Jenkins
Background: Elbow injury rates among baseball pitchers are rapidly rising. However, this increase has been most dramatic among high school (HS) pitchers. Purpose: To examine pitch velocity and the kinetic and kinematic characteristics of HS versus professional (PRO) pitchers to identify potential differences that may play a role in the increased risk of ulnar collateral ligament injury in youth pitchers. Study Design: Controlled laboratory study...
March 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29570600/the-age-of-peak-marathon-performance-in-cross-country-skiing-the-engadin-ski-marathon
#16
Beat Knechtle, Pantelis T Nikolaidis
Knechtle, B and Nikolaidis, PT. The age of peak marathon performance in cross-country skiing-the "Engadin Ski Marathon." J Strength Cond Res 32(4): 1131-1136, 2018-The age of the best endurance performance has been well investigated in flat city running marathons. However, we have no knowledge about the age of peak marathon performance in cross-country skiing, which would be of great practical value for athletes and coaches. Therefore, the aim of the present study was to examine the age of peak marathon performance in cross-country skiing...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29570580/effects-of-exercise-induced-muscle-damage-in-well-trained-cyclists-aerobic-and-anaerobic-performance
#17
Fábio C Karasiak, Luiz Guilherme A Guglielmo
This study purpose was to analyze the effect of EIMD in gross efficiency and in aerobic and anaerobic cycling performance. Nine well-trained cyclists (30.8 ± 6.4 years, cycling experience 8.4 ± 5.6 years) visited the laboratory 5 times. During the first visit, they performed a maximal incremental test on a cycle ergometer, to identify VO2max (55.2 ± 4.9 mL.kg.min) and maximum aerobic power (Pmax; 327.0 ± 28.5 watts). During the second visit (control), they cycled 5 minutes at 60% of Pmax, 5 minutes at 70% of Pmax, 5 minutes time-trial, and Wingate test...
March 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29560605/pacing-in-swimming-a-systematic-review
#18
REVIEW
Katie E McGibbon, D B Pyne, M E Shephard, K G Thompson
BACKGROUND: Pacing strategy, or how energy is distributed during exercise, can substantially impact athletic performance and is considered crucial for optimal performance in many sports. This is particularly true in swimming given the highly resistive properties of water and low mechanical efficiency of the swimming action. OBJECTIVES: The aim of this systematic review was to determine the pacing strategies utilised by competitive swimmers in competition and their reproducibility, and to examine the impact of different pacing strategies on kinematic, metabolic and performance variables...
March 20, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29560159/prevalence-and-awareness-of-anabolic-androgenic-steroids-aas-among-gymnasts-in-the-western-province-of-riyadh-saudi-arabia
#19
Khaled Abdullah Al Bishi, Ayman Afify
Background: Anabolic Androgenic Steroids (AAS) are synthetic derivatives of the male sex hormone (testosterone) that are increasingly used by athletes as performance enhancing drugs to increase muscle mass and strength. Multiple health adverse effects may be caused by its non-medical use. Several international and regional studies showed the high prevalence of AAS usage and low level of awareness of it among different populations. Objective: To estimate the prevalence of AAS and to determine the level of awareness toward it among gymnasts in the western province of Riyadh...
December 2017: Electronic Physician
https://www.readbyqxmd.com/read/29558195/immediate-removal-from-activity-after-sport-related-concussion-is-associated-with-shorter-clinical-recovery-and-less-severe-symptoms-in-collegiate-student-athletes
#20
Breton M Asken, Russell M Bauer, Kevin M Guskiewicz, Michael A McCrea, Julianne D Schmidt, Christopher C Giza, Aliyah R Snyder, Zachary M Houck, Anthony P Kontos, Thomas W McAllister, Steven P Broglio, James R Clugston, Scott Anderson, Jeff Bazarian, Alison Brooks, Thomas Buckley, Sara Chrisman, Michael Collins, John DiFiori, Stefan Duma, Brian Dykhuizen, James T Eckner, Luis Feigenbaum, April Hoy, Louise Kelly, T Dianne Langford, Laura Lintner, Gerald McGinty, Jason Mihalik, Christopher Miles, Justus Ortega, Nicholas Port, Margot Putukian, Steve Rowson, Steven Svoboda
BACKGROUND: Timely removal from activity after concussion symptoms remains problematic despite heightened awareness. Previous studies indicated potential adverse effects of continuing to participate in physical activity immediately after sustaining a concussion. Hypothesis/Purpose: The purpose was to determine the effect of timing of removal from play after concussion on clinical outcomes. It was hypothesized that immediate removal from activity after sport-related concussion (SRC) would be associated with less time missed from sport, a shorter symptomatic period, and better outcomes on acute clinical measures...
March 1, 2018: American Journal of Sports Medicine
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