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Journal of Sports Sciences

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https://www.readbyqxmd.com/read/28143359/the-role-of-blood-flow-restriction-training-for-applied-practitioners-a-questionnaire-based-survey
#1
Stephen D Patterson, Christopher R Brandner
The purpose of the study was to investigate the current use of blood flow restriction (BFR) by practitioners during exercise/training. A questionnaire was developed and data were obtained from 250 participants, with 115 stating that they had prescribed BFR as an intervention. The most common exercise intervention used in combination with BFR was resistance exercise (99/115), followed by during passive (30/115) conditions, and during aerobic exercise (22/115). The main outcome measure for using the technique was to increase muscle mass (32...
February 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28143367/does-a-resistance-exercise-session-with-continuous-or-intermittent-blood-flow-restriction-promote-muscle-damage-and-increase-oxidative-stress
#2
Gabriel R Neto, Jefferson S Novaes, Verônica P Salerno, Michel M Gonçalves, Gilmário R Batista, Maria S Cirilo-Sousa
The aim of this study was to compare the effect of low-load resistance exercise (LLRE) with continuous and intermittent blood flow restriction (BFR) on the creatine kinase (CK), lactate dehydrogenase (LDH), protein carbonyl (PC), thiobarbituric acid-reactive substance (TBARS) and uric acid (UA) levels in military men. The study included 10 recreationally trained men aged 19 ± 0.82 years who underwent the following experimental protocols in random order on separate days (72-96 h): 4 LLRE sessions at a 20% 1RM (one-repetition maximum [1RM]) with continuous BFR (LLRE + CBFR); 4 LLRE sessions at 20% 1RM with intermittent BFR (LLRE + IBFR) and 4 high-intensity resistance exercise (HIRE) sessions at 80% 1RM...
January 31, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28134013/effects-of-knowing-the-task-duration-on-players-pacing-patterns-during-soccer-small-sided-games
#3
Ricardo Ferraz, Bruno Gonçalves, Roland Van Den Tillaar, Sergio Jiménez Sáiz, Jaime Sampaio, Mário Cardoso Marques
The aim of this study was to identify the influence of prior knowledge of exercise duration on players' pacing patterns during soccer small-sided games. Twenty semi-professional male soccer players participated in this study. In the first game scenario, players were not informed how long they would be required to play the small-sided game and the activity was terminated after 20 min (Unknown Condition). In the second game scenario, players were told that they would play the small-sided game for 10 min, but immediately after completing the 10-min game, they were asked to complete another 10 min (Partially Condition)...
January 30, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28134001/psychometric-properties-of-the-talent-development-environment-questionnaire-with-chinese-talented-athletes
#4
Chunxiao Li, Russell Martindale, Yandan Wu, Gangyan Si
The development of talented athletes is a priority for many countries across the world, including China. A validated Chinese 5-factor Talent Development Environment Questionnaire (TDEQ-5) would go some way in helping researchers and practitioners investigate talent development systems within China from an evidence-based perspective. For this purpose, the 25-item English TDEQ-5 was translated to Chinese through a standardised process. The translated scale was then administered to 538 talented Chinese youth athletes...
January 30, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28125339/classification-of-playing-position-in-elite-junior-australian-football-using-technical-skill-indicators
#5
Carl T Woods, James Veale, Job Fransen, Sam Robertson, Neil French Collier
​In team sport, classifying playing position based on a players' expressed skill sets can provide a guide to talent identification by enabling the recognition of performance attributes relative to playing position. Here, elite junior Australian football players were a priori classified into 1 of 4 common playing positions; forward, midfield, defence, and ruck. Three analysis approaches were used to assess the extent to which 12 in-game skill performance indicators could classify playing position. These were a linear discriminant analysis (LDA), random forest, and a PART decision list...
January 26, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28125330/effects-of-bilateral-and-non-dominant-practices-on-the-lateral-preference-in-judo-matches
#6
Eliseo Iglesias-Soler, Xian Mayo, Xurxo Dopico, Miguel Fernández-Del-Olmo, Eduardo Carballeira, Juan Fariñas, Sergio Fernández-Uribe
This study analysed the effects of bilateral and non-dominant practice on novice practitioners' lateral preference for judo skills in a combat context (i.e., randori). Thirty sports sciences students (22 men and 8 women; mean age 19 ± 1 years) with right hand, foot, and counterclockwise rotation preferences were divided into 3 groups: bilateral (BG; n = 8), non-dominant (NDG; n = 11), and control (CG; n = 11). Participants received 8 weeks of training at a rate of 3 days per week. The NDG was trained to perform judo skills exclusive with their non-dominant side, while the BG performed every task symmetrically...
January 26, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28112577/the-impact-phase-of-drop-punt-kicking-for-maximal-distance-and-accuracy
#7
James Peacock, Kevin Ball, Simon Taylor
Impact is an important aspect of the kicking skill. This study examined foot and ball motion during impact and compared distance and accuracy punt kicks. Two-dimensional high-speed video (4000 Hz) captured data of the shank, foot and ball through impact of 11 elite performers kicking for maximal distance and towards a target 20 m in distance. Four phases were identified during impact, with an overall reduction in foot velocity of 5.0 m · s(-1) (± 1.1 m · s(-1)) and increase in ball velocity of 22.7 m · s(-1) (± 2...
January 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28103737/a-multidimensional-approach-to-performance-prediction-in-olympic-distance-cross-country-mountain-bikers
#8
Andrew R Novak, Kyle J M Bennett, Job Fransen, Ben J Dascombe
This study adopted a multidimensional approach to performance prediction within Olympic distance cross-country mountain biking (XCO-MTB). Twelve competitive XCO-MTB cyclists (VO2max 60.8 ± 6.7 ml · kg(-1)( )· min(-1)) completed an incremental cycling test, maximal hand grip strength test, cycling power profile (maximal efforts lasting 6-600 s), decision-making test and an individual XCO-MTB time-trial (34.25 km). A hierarchical approach using multiple linear regression analyses was used to develop predictive models of performance across 10 circuit subsections and the total time-trial...
January 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28102105/pitching-form-determines-probabilistic-structure-of-errors-in-pitch-location
#9
Masahiro Shinya, Shinji Tsuchiya, Yousuke Yamada, Kimitaka Nakazawa, Kazutoshi Kudo, Shingo Oda
According to recent motor control studies, it is important to know probabilistic structure of his/her own motor errors to choose an optimal motor plan (i.e., where you aim at) to maximise the expected gain. In this study, we questioned if pitching form determines the probabilistic structure of pitching errors in baseball pitchers. Eighteen collegiate baseball pitchers with various pitching forms including right- and left-handed overarm, sidearm and underarm throwers threw 100 pitches aiming at a target located 90 cm above the ground...
January 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28097928/validity-and-reliability-of-a-novel-iphone-app-for-the-measurement-of-barbell-velocity-and-1rm-on-the-bench-press-exercise
#10
Carlos Balsalobre-Fernández, David Marchante, Mario Muñoz-López, Sergio L Jiménez
The purpose of this study was to analyse the validity and reliability of a novel iPhone app (named: PowerLift) for the measurement of mean velocity on the bench-press exercise. Additionally, the accuracy of the estimation of the 1-Repetition maximum (1RM) using the load-velocity relationship was tested. To do this, 10 powerlifters (Mean (SD): age = 26.5 ± 6.5 years; bench press 1RM · kg(-1) = 1.34 ± 0.25) completed an incremental test on the bench-press exercise with 5 different loads (75-100% 1RM), while the mean velocity of the barbell was registered using a linear transducer (LT) and Powerlift...
January 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28095747/effects-of-roller-massager-on-muscle-recovery-after-exercise-induced-muscle-damage
#11
Nuno Casanova, Joana F Reis, João R Vaz, Rita Machado, Bruno Mendes, Duane C Button, Pedro Pezarat-Correia, Sandro R Freitas
Two experiments (n = 10) were conducted to determine the effects of roller massager (RM) on ankle plantar flexor muscle recovery after exercise-induced muscle damage (EIMD). Experiment 1 examined both functional [i.e., ankle plantar flexion maximal isometric contraction and submaximal (30%) sustained force; ankle dorsiflexion maximal range of motion and resistance to stretch; and medial gastrocnemius pain pressure threshold] and morphological [cross-sectional area, thickness, fascicle length, and fascicle angle] variables, before and immediately, 1, 24, 48, and 72 h after an EIMD stimulus...
January 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28094682/development-implementation-and-assessment-of-a-concussion-education-programme-for-high-school-student-athletes
#12
Jeffrey G Caron, Scott Rathwell, J Scott Delaney, Karen M Johnston, Alain Ptito, Gordon A Bloom
Although experts have noted that adolescent athletes should be educated about concussions to improve their safety, there is no agreement on the most effective strategy to disseminate concussion education. The purpose of this study was to develop, implement and assess a concussion education programme. More precisely, four interactive oral presentations were delivered to high school student-athletes (N = 35, Mage = 15.94, SD = 0.34) in a large urban centre. Participants completed a questionnaire at three time-points during the season to measure changes in their knowledge (CK) and attitudes (CA) of concussions, and focus group interviews were conducted following the concussion education programme...
January 17, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28092217/development-construct-validity-and-test-retest-reliability-of-a-field-based-wheelchair-mobility-performance-test-for-wheelchair-basketball
#13
Annemarie M H de Witte, Marco J M Hoozemans, Monique A M Berger, Rienk M A van der Slikke, Lucas H V van der Woude, Dirkjan H E J Veeger
The aim of this study was to develop and describe a wheelchair mobility performance test in wheelchair basketball and to assess its construct validity and reliability. To mimic mobility performance of wheelchair basketball matches in a standardised manner, a test was designed based on observation of wheelchair basketball matches and expert judgement. Forty-six players performed the test to determine its validity and 23 players performed the test twice for reliability. Independent-samples t-tests were used to assess whether the times needed to complete the test were different for classifications, playing standards and sex...
January 16, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28092208/the-effects-of-mental-fatigue-on-cricket-relevant-performance-among-elite-players
#14
Darren Veness, Stephen David Patterson, Owen Jeffries, Mark Waldron
This study investigated the effects of a mentally fatiguing test on physical tasks among elite cricketers. In a cross-over design, 10 elite male cricket players from a professional club performed a cricket run-two test, a Batak Lite reaction time test and a Yo-Yo-Intermittent Recovery Level 1 (Yo-Yo-IR1) test, providing a rating of perceived exertion (RPE) after completing a 30-min Stroop test (mental fatigue condition) or 30-min control condition. Perceived fatigue was assessed before and after the two conditions and motivation was measured before testing...
January 16, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28078945/influences-of-population-size-and-density-on-birthplace-effects
#15
David J Hancock, Patrícia Coutinho, Jean Côté, Isabel Mesquita
Contextual influences on talent development (e.g., birthplace effects) have become a topic of interest for sport scientists. Birthplace effects occur when being born in a certain city size leads to participation or performance advantages, typically for those born in smaller or mid-sized cities. The purpose of this study was to investigate birthplace effects in Portuguese volleyball players by analysing city size, as well as population density - an important but infrequently used variable. Participants included 4062 volleyball players (Mage = 33), 53...
January 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28075766/corrigendum
#16
(no author information available yet)
No abstract text is available yet for this article.
January 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28065123/observations-of-youth-football-training-how-do-coaches-structure-training-sessions-for-player-development
#17
Donna O'Connor, Paul Larkin, A Mark Williams
We used systematic observation tools to explore the structure (i.e., activity and inactivity) and sequencing (i.e., the types of activities used) of football coaching sessions in Australia following the implementation of a new National Curriculum. Youth soccer coaches (n = 34), coaching within the Skill Acquisition (U11-U13 n = 19) and Game Training (U14-U17 n = 15) phases of the Football Federation Australia National Curriculum participated. Participants were filmed during a regular coaching session, with systematic observation of the session undertaken to provide a detailed analysis of the practice activities and coach behaviours...
January 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28058989/coordination-of-hitting-movement-revealed-in-baseball-tee-batting
#18
Hiromu Katsumata, Keita Himi, Tenpei Ino, Kyohei Ogawa, Takehiro Matsumoto
Baseball batters must react to pitches delivered to different locations within the strike zone by modulating their movements. In tee-batting practice, such batters place a ball on a tee stand at a location, where they intend to hit the ball, assuming a particular pitch's trajectory. In the present study, we analysed three-dimensional movements in tee-batting to identify characteristics of the batters' intended impact locations across the strike zone, thereby investigating spatiotemporal features of movement modulation...
January 6, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28058976/laterality-related-to-the-successive-selection-of-dutch-national-youth-soccer-players
#19
Jan Verbeek, Marije T Elferink-Gemser, Laura Jonker, Barbara C H Huijgen, Chris Visscher
In the general population, estimates of left-foot preference are around 20%. In soccer, specific tasks create positional demands, requiring 40% of the players to be left-footed. Whether and how this is related to the selection of players is unknown. To examine the successive selection of soccer players for Dutch national youth teams in relation to foot preference, 280 youth players (age = 16.2 ± 1.08 years) were monitored from the U16 through the U19 teams over the last 5 years. No difference in successive selection between left- and right-footed players was found (p < 0...
January 6, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28054499/contribution-of-uncertainty-in-estimation-of-active-drag-using-assisted-towing-method-in-front-crawl-swimming
#20
Pendar Hazrati, Peter James Sinclair, Wayne Spratford, René Edouard Ferdinands, Bruce Robert Mason
Active drag force in swimming can be calculated from a function of five different variables: swim velocity, tow velocity, belt force, power output and exponent of velocity. The accuracy of the drag force value is dependent on the accuracy of each variable, and on the contribution of each variable to drag estimation. To calculate uncertainty in drag value, first the derivatives of the active drag equation with respect to each variable were obtained. Second, these were multiplied by the uncertainty of that variable...
January 5, 2017: Journal of Sports Sciences
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