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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/29952669/putting-the-i-back-in-team
#1
Patrick Ward, Aaron J Coutts, Ricard Pruna, Alan McCall
There is a common expression in sports that "there is no 'I' in team." However, collectively, there is actually a very important "I" in sport teams-the individual athlete/player. Each player has his or her own unique characteristics including physical, physiological, and psychological traits. Due to these unique characteristics, each player requires individual provision-whether it be an injury risk profile and targeted prevention strategy or treatment/rehabilitation for injury, dietary regimen, recovery, or psychological intervention...
September 17, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29431595/wheelchair-mobility-performance-enhancement-by-changing-wheelchair-properties-what-is-the-effect-of-grip-seat-height-and-mass
#2
Rienk M A van der Slikke, Annemarie M H de Witte, Monique A M Berger, Daan J J Bregman, Dirk Jan H E J Veeger
PURPOSE: To provide insight on the effect of wheelchair settings on wheelchair mobility performance (WMP). METHODS: Twenty elite wheelchair basketball athletes of low (n = 10) and high classification (n = 10) were tested in a wheelchair-basketball-directed field test. Athletes performed the test in their own wheelchairs, which were modified for 5 additional conditions regarding seat height (high-low), mass (central-distributed), and grip. The previously developed inertial-sensor-based WMP monitor was used to extract wheelchair kinematics in all conditions...
September 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29431556/the-fit-matters-influence-of-accelerometer-fitting-and-training-drill-demands-on-load-measures-in-rugby-league-players
#3
Blake D McLean, Cloe Cummins, Greta Conlan, Grant Duthie, Aaron J Coutts
PURPOSE: To determine the relationship between drill type and accelerometer-derived loads during various team-sport activities and examine the influence of unit fitting on these loads. METHODS: Sixteen rugby league players were fitted with microtechnology devices in either manufacturer vests or playing jerseys before completing standardized running, agility, and tackling drills. Two-dimensional (2D) and 3-dimensional (3D) accelerometer loads (BodyLoad™) per kilometer were compared across drills and fittings (ie, vest and jersey)...
September 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29431548/impact-of-energy-availability-health-and-sex-on-hemoglobin-mass-responses-following-live-high-train-high-altitude-training-in-elite-female-and-male-distance-athletes
#4
Ida A Heikura, Louise M Burke, Dan Bergland, Arja L T Uusitalo, Antti A Mero, Trent Stellingwerff
PURPOSE: The authors investigated the effects of sex, energy availability (EA), and health status on the change in hemoglobin mass (ΔHbmass) in elite endurance athletes over ∼3-4 wk of live-high-train-high altitude training in Flagstaff, AZ (2135 m; n = 27 women; n = 21 men; 27% 2016 Olympians). METHODS: Precamp and postcamp Hbmass (optimized carbon monoxide rebreathing method) and iron status were measured, EA was estimated via food and training logs, and a Low Energy Availability in Females Questionnaire (LEAFQ) and a general injury/illness questionnaire were completed...
September 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29466065/physical-preparation-factors-that-influence-technical-and-physical-match-performance-in-professional-australian-football
#5
Samuel Ryan, Aaron J Coutts, Joel Hocking, Patrick A Dillon, Anthony Whitty, Thomas Kempton
OBJECTIVES: To examine the collective influence of a range of physical preparation elements on selected performance measures during Australian football match play. DESIGN: Prospective and longitudinal. METHODS: Data were collected from 34 professional Australian football players from the same club during the 2016 Australian Football League competition season. Match activity profiles and acute (7-d) and chronic (3-wk) training loads were collected using global positioning system devices...
September 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29466027/effect-of-cold-water-immersion-on-handgrip-performance-in-rock-climbers
#6
Jan Kodejška, Jiří Baláš, Nick Draper
PURPOSE: To determine the effect of 2 cold-water-immersion (CWI) temperatures (15°C and 8°C) on repeat handgrip performance to failure. METHODS: A total of 32 participants completed 3 intermittent trials to failure on a climbing-specific handgrip dynamometer on 3 laboratory visits. For each visit, a different recovery strategy was employed: passive (PAS) recovery, CWI at 8°C (CW8), or CWI at 15°C (CW15). The force time integral (FTI: time of contraction multiplied by the force of contraction) was determined to assess handgrip performance...
September 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29431538/the-use-of-microtechnology-to-monitor-collision-performance-in-professional-rugby-union
#7
Simon J MacLeod, Chris Hagan, Mikel Egaña, Jonny Davis, David Drake
PURPOSE: To determine if microtechnology-derived collision loads discriminate between collision performance and compare the physical and analytical components of collision performance between positional groups. METHODS: Thirty-seven professional male rugby union players participated in this study. Collision events from 11 competitive matches were coded using specific tackle and carry classifications based on the ball-carrier's collision outcome. Collisions were automatically detected using 10 Hz microtechnology units...
September 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204530/the-influence-of-pleasure-and-attentional-focus-on-performance-and-pacing-strategies-in-elite-individual-time-trials
#8
Theo Ouvrard, Alain Groslambert, Frederic Grappe
Recent psychophysiological models of endurance performance explained that pacing strategies and exercise intensity regulation influence cyclists' ability to produce high mean power output (PO) during time-trial. However, the relationships between these pacing strategies and psychological parameters of the athletes remain unknown. PURPOSE: The aims of this study were to 1) determine the impact of pacing strategies on cyclists' mean PO during an elite time-trial championship and 2) identify the relationships between these pacing strategies and psychological parameters...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204529/inter-unit-reliability-and-effect-of-data-processing-methods-of-global-positioning-systems
#9
Heidi R Thornton, André R Nelson, Jace A Delaney, Fabio R Serpiello, Grant M Duthie
PURPOSE: To establish the inter-unit reliability of a range of Global Positioning System (GPS)-derived movement indicators, determine the variation between manufacturers, and investigate the difference between software-derived and raw data. METHODS: A range of movement variables were obtained from 27 GPS units from three manufacturers (GPSports EVO; 10 Hz, n = 10: STATSports Apex; 10 Hz, n = 10: and Catapult S5; 10 Hz, n = 7) that measured the same team-sports simulation session while positioned on a sled...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204528/validity-of-session-rating-of-perceived-exertion-assessed-via-the-cr100%C3%A2-scale-to-track-internal-load-in-elite-youth-football-players
#10
Sharna A Naidu, Maurizio Fanchini, Adam Cox, Joshua Smeaton, Will G Hopkins, Fabio R Serpiello
PURPOSE: To assess the convergent validity of the Borg CR100® scale to track internal training load (TL) in youth football players. METHODS: Nineteen youth football players (age 15 ± 1 y, height 175.9 ± 12.3 cm, body mass 69 ± 15.4 kg) were monitored for 27 sessions, including training and games. Internal training load was assessed via session rating of perceived exertion (sRPE) and two heart rate (HR)-based methods; Banister's training impulse (TRIMP) and Edwards' TL...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204523/higher-vs-lower-intensity-strength-training-taper-effects-on-neuromuscular-performance
#11
Hayden J Pritchard, Matthew J Barnes, Robin J Stewart, Justin W Keogh, Michael R McGuigan
PURPOSE: To investigate the effects of strength training tapers of different intensities, but equal volume reductions, on neuromuscular performance. METHODS: Eleven strength-trained males (21.3±3.3 years, 92.3±17.6 kg, relative 1RM deadlift 1.9±0.2 times bodyweight) completed a crossover study. Specifically, two four-week strength training blocks were followed by a taper week with reduced volume (~70%) involving either an increased (5.9%) or decreased (-8.5%) intensity...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204520/effects-of-plyometric-and-directional-training-on-physical-fitness-parameters-in-youth-soccer-players
#12
Yiannis Michailidis, Alexandros Tabouris, Thomas Metaxas
PURPOSE: The aim of this study is to investigate whether the combination of a soccer training session, plyometric training (PT) and change of direction (COD) exercises would enhance soccer ability to a greater extent than training on its own in youth soccer players. METHODS: Thirty-one youth players participated in this study (age 12±0.8 years). Players were randomly separated into 2 groups: control group (CG, n=14) and intervention group (INTG) which performed extra PT and COD exercises (INTG, n=17)...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204518/improvement-of-kinetic-kinematic-and-qualitative-performance-variables-of-the-power-clean-with-the-hook-grip
#13
Dustin J Oranchuk, Eric J Drinkwater, Riki S Lindsay, Eric R Helms, Eric T Harbour, Adam G Storey
PURPOSE: The power clean (PC) and other weightlifting movements are commonly used in the development of muscular power. However, there is a paucity of research examining the use of the hook-grip (HG) in weightlifting performance. Therefore the purpose of this study was to compare one repetition maximum (1RM) and kinetic, kinematic, and qualitative variables across a range of loads (75-100%) during PC performance with a HG and a closed-grip (CG). METHODS: Eleven well-trained males (PC 1RM = 113...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204517/presleep-casein-protein-ingestion-acceleration-of-functional-recovery-in-professional-soccer-players
#14
William Abbott, Adam Brett, Emma Cockburn, Tom Clifford
PURPOSE: This study examined whether consuming casein protein (CP) before sleep would enhance recovery after a night-time soccer match in professional players. METHODS: In a randomized, crossover design, ten professional soccer players from the reserve squad of a team in the highest tier of English soccer consumed 40 g of CP or 40 g of carbohydrates (CON) 30 min pre-sleep after a soccer match (kick off 19:00). To assess recovery, countermovement jump (CMJ) height, reactive strength index (RSI), muscle soreness (MS), and the adapted Brief Assessment of Mood Questionnaire (BAM+) were measured before, 12, 36 and 60 h after each match...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204516/caffeine-and-sprint-cycling-performance-effects-of-torque-factor-and-sprint-duration
#15
Mark Glaister, Colin Towey, Owen Jeffries, Daniel Muniz-Pumares, Paul Foley, Gillian McInnes
PURPOSE: The aim of this study was to investigate the influence of torque factor and sprint duration on the effects of caffeine on sprint cycling performance. METHODS: Using a counterbalanced, randomized, double-blind, placebo-controlled design, 13 men completed nine trials. In Trial 1, participants completed a series of 6 s sprints at increasing torque factors, to determine the torque factor, for each individual, which elicited the highest (TOPTIMAL ) peak power output (PPO)...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204514/the-reproducibility-and-external-validity-of-a-modified-rugby-league-movement-simulation-protocol-for-interchange-players
#16
Jonathan P Norris, Jamie Highton, Craig Twist
PURPOSE: The study assessed the reliability and external validity of a rugby league movement simulation protocol for interchange players that was adapted to include physical contact between participants. METHODS: Eighteen rugby players performed two trials of a modified rugby league movement simulation protocol for interchange players (RLMSP-i), seven days apart. The simulation was conduced outdoors on artificial turf with movement speeds controlled using an audio signal...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204512/determining-the-relationship-between-internal-load-markers-and-non-contact-injuries-in-young-elite-soccer-players
#17
Javier Raya-González, Fabio Yuzo Nakamura, Daniel Castillo, Javier Yanci, Maurizio Fanchini
PURPOSE: To examine the association and predictive ability of internal load markers with regards to non-contact injuries in young elite soccer players. METHODS: Twenty-two soccer players (18.6 ± .6 years) who competed in the Spanish U19 League participated in the study. During a full season, non-contact injuries were recorded and, using session rating of perceived exertion (s-RPE), internal weekly load (sum of load of all training sessions and matches for each week) and acute:chronic workload ratio (typically, acute = current week and chronic = rolling 4 week average) were calculated...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204509/load-velocity-relationship-in-national-paralympic-powerlifters-a-case-study
#18
Irineu Loturco, Lucas A Pereira, Ciro Winckler, Weverton L Santos, Ronaldo Kobal, Michael McGuigan
PURPOSE: This study examined the relationships between different loading intensities and movement velocities in the bench-press exercise (BP) in Paralympic powerlifters. METHODS: Seventeen National Paralympic powerlifters performed maximum dynamic strength tests to determine their BP one-repetition maximum (1RM) in a Smith-machine device. A linear position transducer was used to measure the movement velocity over a comprehensive range of loads. Linear regression analysis was performed to establish the relationships between the different bar-velocities and the distinct percentages of 1RM (%1RM)...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204507/effects-of-concentric-and-eccentric-strength-training-on-fatigue-induced-by-concentric-and-eccentric-exercise
#19
Eduardo Lusa Cadore, Miriam González-Izal, Rafael Grazioli, Igor Setuain, Ronei Silveira Pinto, Mikel Izquierdo
PURPOSE: This study compared the concentric and eccentric training effects on fatigue induced by eccentric and concentric protocols. METHODS: Twenty-two men and women (22 ± 3.6 years) were assigned to concentric (GCON, n=11) or eccentric training (GECC, n=11). The concentric (CON) and eccentric (ECC) protocols were composed of 4 sets of 20 knee extension/flexion repetitions. Force losses were analysed by comparing 10 repetitions' mean torques during the protocols and verifying the maximal voluntary contraction (MVC) and rate of torque development (RTD) before and after the protocols...
September 11, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30204506/the-difference-in-neuromuscular-fatigue-and-workload-during-competition-and-training-in-elite-cricketers
#20
Kieran Cooke, Tom Outram, Raph Brandon, Mark Waldron, Will Vickery, James Keenan, Jamie Tallent
PURPOSE: To firstly, assess changes in neuromuscular function via alterations in the countermovement jump strategy, after training and two forms of competition. Secondly, to compare the relationship between workloads and fatigue in seam bowlers and non-seam bowlers. METHODS: Twenty-two professional cricketers' neuromuscular function was assessed at baseline, immediately post and +24 h post-training, as well as after multi-day and one-day cricket events. In addition, perceptual (rating of perceived exertion; RPE and soreness) measures and external loads (Player LoadTM , number of sprints, total distance, overs) were monitored across all formats...
September 11, 2018: International Journal of Sports Physiology and Performance
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