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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/28182523/monitoring-hitting-load-in-tennis-using-inertial-sensors-and-machine-learning
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/28182506/accuracy-and-validity-of-commercially-available-kayak-ergometers
#5
Thiago Oliveira Borges, Nicola Bullock, David Aitken, Aaron J Coutts
This study compared three commercially available ergometers for within- and between- brand difference to a first principles calibration rig. All ergometers underestimated true mean power with errors of 27.6 ± 3.7%, 4.5 ± 3.5% and 22.5 ± 1.9% for the KayakPro(®), WEBA and Dansprint. Within-brand ergometer power differences ranged from 17 ± 9 to 22 ± 11 W for the KayakPro(®); 3 ± 4 to 4 ±4 W for the WEBA and 5 ± 3 to 5 ± 4 W for the Dansprint. The linear regression analysis showed that most kayak ergometers possess a stable CV (0...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182505/factors-affecting-match-running-performance-in-professional-australian-football
#6
Samuel Ryan, Aaron J Coutts, Joel Hocking, Thomas Kempton
PURPOSE: To examine the influence of a range of individual player characteristics and match-related factors on activity profiles during professional Australian football matches. METHODS: Global positioning system (GPS) profiles were collected from 34 professional Australian football players from the same club over 15 competition matches. GPS data were classified into relative total and high-speed running (HSR; >20 km·h(-1)) distances. Individual player aerobic fitness was determined from a two-kilometre time trial conducted during the pre-season...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182504/the-player-load-associated-with-typical-activities-in-elite-netball
#7
Jared A Bailey, Paul B Gastin, Luke Mackey, Dan B Dwyer
PURPOSE: Previous investigations of player load in netball have utilised subjective methodologies, with few utilising objective methodologies. Whilst all studies report differences in player activities or total load between playing positions, it is unclear how the differences in player activity explain differences in positional load. The aim of this study was to objectively quantify the load associated with typical activities for all positions in elite netball. METHODS: The player load of all playing positions in an elite netball team, was measured during matches using wearable accelerometers...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182503/do-glucose-and-caffeine-nasal-sprays-influence-exercise-and-or-cognitive-performance
#8
Kevin De Pauw, Bart Roelands, Jeroen Van Cutsem, Lieselot Decroix, Angelica Valente, Kim Taehee, Robert B LettanII, Andres E Carrillo, Romain Meeusen
INTRODUCTION/PURPOSE: Since nasal sprays (NAS) containing caffeine (CAF) or glucose (GLUC) activate sensory(motor) cortices, the aim of this study was to investigate the influence of CAF or GLUC-NAS on exercise and cognitive performance. METHODS: Eleven male subjects (Age: 22±2 yrs) performed a maximal cycle test, two familiarization and three experimental trials. Each trial included a 30 s Wingate test and a 30 min time-trial (TT) performance test interspersed by 15 min of rest...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182500/validity-of-various-methods-for-determining-velocity-force-and-power-in-the-back-squat
#9
Harry G Banyard, Ken Nosaka, Kimitake Sato, G Gregory Haff
PURPOSE: This investigation examined the validity of two kinematic systems for assessing mean velocity (MV), peak velocity (PV), mean force (MF), peak force (PF), mean power (MP), and peak power (PP) during the full depth free-weight back squat performed with maximal concentric effort. METHODS: Ten strength-trained men (26.1±3.0 y; 1.81±0.07 m; 82.0±10.6 kg) performed three 1-repetition maximum (1RM) trials on three separate days, encompassing lifts performed at six relative intensities including 20, 40, 60, 80, 90, and 100% of 1RM...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28121198/supercompensation-kinetics-of-physical-qualities-during-a-taper-in-team-sport-athletes
#10
Bruno Marrier, Julien Robineau, Julien Piscione, Mathieu Lacome, Alexis Peeters, Christophe Hausswirth, Jean-Benoît Morin, Yann Le Meur
PURPOSE: Peaking for major competition is considered critical for maximizing team sports performance. However, there is little scientific information available to guide coaches in prescribing efficient tapering strategies for team sports players. The aim of this study was to monitor the changes in physical performance in elite team sports players during a 3-week taper following a pre-season training camp. METHODS: Ten male international rugby sevens players were tested before (Pre) and after (Post) a 4-week pre-season training camp focusing on high-intensity training and strength training with moderate loads, and once each week during a subsequent 3-week taper (T1, T2, T3)...
January 25, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28121188/timing-effect-on-training-session-rating-of-perceived-exertion-in-top-class-soccer-referees
#11
Carlo Castagna, Mario Bizzini, Susana Cristina Araújo Póvoas, Stefano D'Ottavio
PURPOSE: To examine the effect of recall timing on training session rating of perceived exertion (S-RPE) in a population of method procedures well-familiarized athletes, during a 5-days training micro-cycle. METHODS: Fifty-one top class Field Referees (FR, age 38.4±3.3 years; height 181±5.6 cm; body mass 76.8±6.8 kg; body max index, 23.4±1.7 kg·m2; body fat 20.4±3.6%; international refereeing experience 5±3.5 years) from 43 National Football Associations worldwide, preselected by FIFA Refereeing Department for officiating during the FIFA WC 2014 Brazil volunteered for this study...
January 25, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095083/physiological-capacity-and-training-routines-of-elite-cross-country-skiers-approaching-the-upper-limits-of-human-endurance
#12
Øyvind Sandbakk, Hans-Christer Holmberg
Cross-country skiing is one of the most demanding of endurance sports, involving protracted competitions on varying terrain employing a variety of skiing techniques that require upper- and/or lower-body work to different extents. Through more effective training and extensive improvements in equipment and track preparation, the speed of cross-country ski races has increased more than that of any other winter Olympic sport and, in addition, new types of racing events have been introduced. To a certain extent this has altered the optimal physiological capacity required to win and the training routines of successful skiers have evolved accordingly...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095082/effect-of-concussion-on-performance-of-national-football-league-players
#13
Nicole Reams, Rodney A Hayward, Jeffrey S Kutcher, James F Burke
PURPOSE: Lingering neurologic injury after concussion may expose athletes to increased risk if return-to-play is premature. We explored whether on-field performance after concussion is a marker of lingering neurologic injury. METHODS: Retrospective cohort study on 1,882 skill-position players who played in the National Football League (NFL) during 2007-2010. Players with concussion based on the weekly injury report, were compared to players with other head and neck injuries (controls) on measures of on-field performance using Football Outsiders' calculation of Defense-Adjusted Yards Above Replacement (DYAR): a measure of a player's contribution controlling for game context...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095081/blood-removal-influences-pacing-during-a-4-minute-cycling-time-trial
#14
Nathan G Lawler, Chris R Abbiss, Aaron Raman, Timothy J Fairchild, Garth L Maker, Robert D Trengove, Jeremiah J Peiffer
PURPOSE: To examine the influence of manipulating aerobic contribution following whole blood removal on pacing patterns, performance and energy contribution during self-paced middle distance cycling. METHODS: Seven male cyclists (33 ± 8 y) completed an incremental cycling test followed 20 min later by a 4-min self-paced cycling time trial (4MMP) on six separate occasions over 42 d. The initial two sessions acted as a familiarisation and baseline testing after which 470 mL of blood was removed with the remaining sessions performed 24 h, 7 d, 21 d and 42 d following blood removal...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095077/running-performance-with-nutritive-and-non-nutritive-sweetened-mouth-rinses
#15
Keely H Hawkins, Sridevi Krishnan, Lara Ringos, Vanessa Garcia, Jamie A Cooper
: Mouth rinsing (MR) with carbohydrate during exercise has been shown to act as an ergogenic aid. PURPOSE: To investigate if nutritive or nonnutritive sweetened MR affect exercise performance, and to assess the influence of sweetness intensity on endurance performance during a time-trial (TT). METHODS: This randomized, single blinded study had 4 treatment conditions. 16 subjects (9 men, 7 women) completed a 12.8km TT four different times. During each TT, subjects MR and expectorated a different solution at time 0 and every 12...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095076/impaired-player-coach-perceptions-of-exertion-and-recovery-during-match-congestion
#16
Steven H Doeven, Michel S Brink, Wouter G P Frencken, Koen A P M Lemmink
: During intensified phases of competition, attunement of exertion and recovery is crucial to maintain performance. Although a mismatch between coach' and players' perceptions of training load is demonstrated, it is unknown if these discrepancies also exist for match exertion and recovery. PURPOSE: The aims of this study are to determine match exertion, subsequent recovery and to investigate to what extent the coach is able to estimate players' match exertion and recovery...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095075/a-pilot-study-using-entropy-as-a-non-invasive-assessment-of-running
#17
Andrew M Murray, Joong Hyun Ryu, John Sproule, Anthony P Turner, Phil Graham-Smith, Marco Cardinale
PURPOSE: Running performance is influenced by the interaction of biomechanical and physiological factors. Miniaturised accelerometers worn by the athlete can be used to quantify mechanical aspects of running and be used as a non-invasive tool to assess training status and progression. The aim of this study was to define and validate a method to assess running regularity and allow the estimation of an individual's V̇O2 and/or blood lactate [La]b based on data collected with accelerometers and heart rate (HR)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095074/effects-of-cycling-training-at-imposed-low-cadences-a-systematic-review
#18
Ernst A Hansen, Bent R Rønnestad
The present article reviews effects of training at low imposed cadences in cycling. We performed a systematic literature search of MEDLINE and SPORTDiscus up to April 2016 to identify potentially relevant articles. Based on the titles and abstracts of the identified articles, a subset of articles was selected for evaluation. These articles constituted original research articles on adaptation to training at different imposed cadences in cycling. Seven articles were selected for evaluation. With regard to the terminology in the present article, "low cadences" refers to cadences below the freely chosen cadence...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095070/player-responses-to-match-and-training-demands-during-an-intensified-fixture-schedule-in-professional-rugby-league-a-case-study
#19
Craig Twist, Jamie Highton, Matthew Daniels, Nathan Mill, Graeme Close
Player loads and fatigue responses were reported in 15 professional rugby league players (24.3 ± 3.8 y) during a period of intensified fixtures. Repeated measures of internal and external loads, perceived wellbeing and jump flight time were recorded across 22 days, comprising nine training sessions and matches on days 5, 12, 15 and 21 (player exposure: 3.6 ± 0.6 matches). Mean training load (session RPE x duration) between matches was 1177, 1083, 103, and 650 AU, respectively. Relative distance in Match 1 (82 m/min) and Match 4 (79 m/min) was very likely lower in Match 2 (76 m/min) and likely higher in Match 3 (86 m/min)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095069/the-evolution-of-champion-cross-country-skier-training-from-lumberjacks-to-professional-athletes
#20
Øyvind Sandbakk
Competitive cross-country (XC) skiing has traditions extending back to the mid-19th century, and was included as a men's event in the first Winter Games in 1924. Since then, tremendous improvements in equipment, track preparation, and knowledge about training have prompted greater increases in XC skiing speeds than in any other Olympic sport. In response, this commentary focuses on how the training of successful XC skiers has evolved, with interviews and training data from surviving Norwegian world and Olympic XC champions as primary sources...
January 17, 2017: International Journal of Sports Physiology and Performance
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