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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/28290730/qualitative-video-analysis-of-track-cycling-team-pursuit-in-world-class-athletes
#1
Samuel Sigrist, Thomas Maier, Raphael Faiss
PURPOSE: Track cycling team pursuit (TP) is a highly technical effort involving 4 athletes completing 4 km from a standing start often in less than 240 s. Transitions between athletes leading the team are obviously of utmost importance. The aim of this study is to perform qualitative video analyses of transitions of world-class athletes in team pursuit competitions. METHODS: Videos captured at 100 Hz were recorded for 77 races (including 96 different athletes) in 5 international track cycling competitions (e...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290725/staying-out-of-range-increasing-attacking-distance-in-fencing
#2
Anthony N Turner, Geoff Marshall, Angelo Noto, Shyam Chavda, Nathan Atlay, David Kirby
To avoid being hit, fencers typically adopt an out of range position, which was hypothesized to be governed by body- and action-scaled affordances. This theory was measured in elite and national level junior (u20) fencers. Associations between "reachability" of lunging and step-lunging attacks, was assessed against height, arm-span, leg-span, body mass and lower-body power, and then compared across level. Reachability was determined as the distance covered by fencers during these attacks and was reported as actual and estimated distances...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290720/comparison-of-heart-rate-variability-recording-with-smart-phone-photoplethysmographic-polar-h7-chest-strap-and-electrocardiogram-methods
#3
Daniel J Plews, Ben Scott, Marco Altini, Matt Wood, Andrew E Kilding, Paul B Laursen
PURPOSE: To establish the validity of smartphone photoplethysmography (PPG) and heart rate sensor in the measurement of heart rate variability (HRV). METHODS: 29 healthy subjects were measured at rest during 5 min of guided breathing (GB) and normal breathing (NB) using Smartphone PPG, heart rate chest strap and electrocardiography (ECG). The root mean sum of the squared differences between R-R intervals (rMSSD) was determined from each device. RESULTS: Compared to ECG, the technical error of estimate (TEE) was acceptable for all conditions (average TEE CV% (90% CI) = 6...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290718/assessments-of-mechanical-stiffness-and-relationships-to-performance-determinants-in-middle-distance-runners
#4
Simon A Rogers, Chris S Whatman, Simon N Pearson, Andrew E Kilding
PURPOSE: This study aimed to examine relationships between methods of lower-limb stiffness and their associations with running economy (RE) and maximal velocity (vmax) in middle-distance (MD) runners. METHODS: Eleven highly-trained male MD runners performed a series of mechanical and physiological tests to determine maximal overground sprint speed, RE and V̇O2peak. Achilles tendon stiffness (kT) was estimated using ultrasonography during maximal isometric ankle plantarflexion...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290716/cycling-vs-uphill-walking-impact-on-locomotor-muscle-fatigue-and-running-exercise
#5
Benjamin Pageaux, Jean Theurel, Romuald Leper
PURPOSE: To describe the effects of uphill walking versus cycling exercises on knee extensors (KE) neuromuscular properties and subsequent running exercise. METHODS: Nine athletes performed four different sessions (one familiarization and three experimental sessions, visit 2 to 4). Visit 2 (cycling + 10 km condition) consisted of the completion of 1-h cycling followed by a 10 km running time trial. Visit 3 consisted of the completion of 1-h uphill walking followed by a 10 km running exercise (RE)...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253043/development-of-1500m-pacing-behavior-in-junior-speed-skaters-a-longitudinal-study
#6
Rikstje Wiersma, Inge K Stoter, Chris Visscher, Florentina J Hettinga, Marije T Elferink-Gemser
PURPOSE: Providing insight in the development of pacing behavior in junior speed skaters and analyse possible differences between elite, sub-elite, and non-elite juniors. METHODS: 1500m season best times (SBT) and corresponding pacing behavior were obtained longitudinally for 104 Dutch male speed skaters at age 13-14(U15), 15-16(U17), and 17-18(U19) years. Based on their U19 SBT, skaters were divided into elite(n=17), sub-elite(n=64), and non-elite(n=23) groups...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253042/monitoring-elite-soccer-players-external-loads-using-real-time-data
#7
Steve Barrett
PURPOSE: The principle aim of the study was to assess the validity of measuring locomotor activities and PlayerLoad using Real-Time (RT) data collection during soccer training. METHODS: Twenty-nine (n=29) English soccer players participated. Each player wore the same MEMS device (S5, Optimeye, CatapultSports, Melbourne, Australia) during twenty-one training sessions (n= 331 data sets) in the 2015/2016 and 2016/2017 season. A Real-Time receiver (TRX, Catapultsports, Melbourne, Australia) was used to collect the locomotor activities and PlayerLoad data in RT and compared with the post-event downloaded (PED) data...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253041/load-force-and-power-velocity-relationships-in-the-prone-pull-up-exercise
#8
Mario Muñoz-López, David Marchante, Miguel A Cano-Ruiz, José López Chicharro, Carlos Balsalobre-Fernández
PURPOSE: To analyze the load, force and power-velocity relationships, as well as to determine the load that optimizes power output on the pull-up exercise. METHODS: Eighty-two resistance trained males (Age = 26.8 ± 5.0 yrs.; Pull-up 1RM - normalized per kg of body mass- = 1.5 ± 0.34) performed two repetitions with 4 incremental loads (ranging 70-100%1-RM) in the pull-up exercise while mean propulsive velocity (MPV), force (MPF) and power (MPP) were measured using a linear transducer...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253040/demands-of-world-cup-competitions-in-elite-women-road-cycling
#9
Paolo Menaspà, Marco Sias, Gene Bates, Antonio La Torre
PURPOSE: Describing the demand of recent World Cup (WC) races comparing Top 10 (T10) and non-Top 10 (N-T10) performances using power data. METHODS: Race data were collected in 1-day World Cup races during the 2012-2015 road cycling seasons. Seven female cyclists completed 49 WC races, finishing 25 times in T10 and 24 times N-T10. Peak power (1 s) and Maximal Mean Power (MMP) for durations of 5, 10, 20 and 30 s and 1, 2, 5, 10, 20, 30 and 60 min expressed as power to weight ratio were analysed in T10 and N-T10...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253038/monitoring-training-loads-the-past-the-present-and-the-future
#10
Carl Foster, Jose A Rodriguez-Marroyo, Jos J de Koning
Training monitoring is about keeping track of what athletes accomplish in training, for the purpose of improving the interaction between coach and athlete. Over history there have been several basic schemes of training monitoring. In the earliest days training monitoring was about observing the athlete during standard workouts. However, difficulty in standardizing the conditions of training made this process unreliable. With the advent of interval training, monitoring became more systematic. However, imprecision in the measurement of HR evolved interval training toward index workouts, where the main monitored parameter was average time required to complete index workouts...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253034/playing-experience-and-position-influence-injury-risk-among-ncaa-division-i-collegiate-footballers
#11
Robert McCunn, Hugh H K Fullagar, Sean Williams, Travis J Halseth, John A Sampson, Andrew Murray
PURPOSE: American football is widely played by collegiate student-athletes throughout the United States; however, the associated injury risk is greater than in other team sports. Numerous factors likely contribute to this risk yet research identifying these risk factors is limited. The present study sought to explore the relationship between playing experience and position on injury risk within NCAA Division I collegiate footballers. METHODS: Seventy-six male collegiate student athletes within the American football program of an NCAA Division I university participated...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253031/the-relationship-between-training-load-and-injury-in-men-s-professional-basketball-players
#12
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/28253028/scoring-analysis-of-manoeuvres-performed-in-elite-male-professional-surfing-competitions
#13
James R Forsyth, Ryan de la Harpe, Diane L Riddiford-Harland, John W Whitting, Julie R Steele
PURPOSE: Our primary aim was to investigate the influence of turns, tube rides and aerial manoeuvres on the scores awarded in elite male professional surfing competitions. We also investigated the successful completion rate and scores associated with different aerial variations. METHODS: Video recordings from all 11 events of the 2015 Men's World Championship Tour were viewed to classify manoeuvres performed by the competitors on each wave as turns, tube rides and aerials...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253027/wingate-test-is-a-strong-predictor-of-1500m-performance-in-elite-speed-skaters
#14
Nico Hofman, Jac Orie, Marco J M Hoozemans, Carl Foster, Jos J de Koning
Wingate test scores are strongly associated with anaerobic capacity in athletes involved in speed-endurance sports. In speed skating Wingate results are known to predict performance cross-sectionally, but have not been investigated relative to their ability to predict performance longitudinally. PURPOSE: To investigate whether Wingate tests performed during summer training are predictive of 1500m speed skating performance the subsequent winter in elite speed skaters. METHODS: Wingate test results from the summer training periods and 1500m performances during the subsequent winter were analyzed over a 3-year period, in 5 female and 8 male elite (Olympic, World Championship and World Cup medalists) speed skaters...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253026/training-intensity-distribution-in-road-cyclists-objective-versus-subjective-measures
#15
Dajo Sanders, Tony Myers, Ibrahim Akubat
PURPOSE: This study aims to evaluate training intensity distribution using different intensity measures based on session rating of perceived exertion (sRPE), heart rate (HR) and power output (PO) in well-trained cyclists. METHODS: Fifteen road cyclists participated in the study. Training data was collected during a 10-week training period. Training intensity distribution was quantified using HR, PO and sRPE categorized in a 3-zone training intensity model. Three zones for HR and PO were based around a first and second lactate threshold...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253025/long-sprint-abilities-in-soccer-ball-vs-running-drills
#16
Carlo Castagna, Lorenzo Francini, Susana Cristina Araújo Póvoas, Stefano D'Ottavio
PURPOSE: To examine the acute effects of generic (Running Drills, RD) and specific (Small-Sided Games, SSG) Long Sprint Ability (LSA) drills on internal and external load of male soccer-players. METHODS: Fourteen academy-level soccer-players (mean±SD; age 17.6±0.61 years, height 1.81±0.63 m, body-mass 69.53±4.65 kg) performed four 30s LSA bouts for maintenance (work:rest, 1:2) and production (1:5) with RD and SSG drills. Players' external-load was tracked with GPS technology (20Hz) and heart-rate (HR), blood-lactate concentrations (BLc) and rate of perceived exertion (RPE) were used to characterize players' internal-load...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182523/monitoring-hitting-load-in-tennis-using-inertial-sensors-and-machine-learning
#17
David Whiteside, Olivia Cant, Molly Connolly, Machar Reid
PURPOSE: Quantifying external workload is fundamental to training prescription in sport. In tennis, global positioning data are imprecise and fail to capture hitting loads. The current gold standard (manual notation) is time intensive and often not possible given players' heavy travel schedules. The aim of this study was to develop an automated stroke classification system to help quantify hitting load in tennis. METHODS: 18 athletes wore an inertial measurement unit (IMU) on their wrist during 66 video-recorded training sessions...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182511/confirming-the-value-of-adolescent-swimming-performance-models
#18
Shilo J Dormehl, Samuel J Robertson, Alan R Barker, Craig A Williams
PURPOSE: To evaluate the efficacy of existing performance models to assess the progression of male and female adolescent swimmers through a quantitative and qualitative mixed-methods approach. METHODS: Fourteen published models were tested using retrospective data from an independent sample of Dutch junior national-level swimmers from when they were between 12 and 18 years of age (n=13). The degree of association by Pearson's correlations were compared between the calculated differences from the models and quadratic functions derived from the Dutch junior national qualifying times...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182510/the-effect-of-plyometric-training-volume-in-prepubertal-male-soccer-players-athletic-performance
#19
Helmi Chaabene, Yassine Negra
PURPOSE: The aim of this study was to assess and to compare the effects of 8-weeks in-season (2 sessions per-week) low and high-volume plyometric training (PT) on measures of physical fitness in prepubertal male soccer players. METHODS: A total of twenty-five soccer players were randomly assigned to low-volume plyometric training group (LPT; n=13; age = 12.68 ± 0.23 years; age at peak height velocity (APHV) = 14.25 ± 0.29 years, maturity-offset = -1.57 ± 0.29 years) and high-volume plyometric training group (HPT; n=12; age = 12...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182509/knowledge-of-task-end-point-influences-pacing-and-performance-during-simulated-rugby-league-match-play
#20
Jamie Highton, Thomas Mullen, Craig Twist
PURPOSE: To examine the influence of knowledge of exercise duration on pacing and performance during simulated rugby league match-play. METHODS: Thirteen male university rugby players completed three simulated rugby league matches (RLMSP-i) on separate days in a random order. In a control trial, participants were informed that they would be performing 2 x 23 min bouts (separated by 20 min) of the RLMSP-i (CON). In a second trial, participants were informed that they would be performing 1 x 23 min bout of the protocol, but were then asked to perform another 23 min bout (DEC)...
February 9, 2017: International Journal of Sports Physiology and Performance
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