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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/28095083/physiological-capacity-and-training-routines-of-elite-cross-country-skiers-approaching-the-upper-limits-of-human-endurance
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28095067/pacing-strategies-and-metabolic-responses-during-4-minute-running-time-trials
#10
Jonathan Watkins, Simon Platt, Erik Andersson, Kerry McGawley
PURPOSE: The aim of the current study was to investigate pacing strategies and the distribution of physiological resources in best versus worst performances during a series of 4-minute, self-paced running time-trials (RunTTs). METHODS: Five male and five female recreational runners (age 32 ± 7 years) completed a sub-maximal ramp test and five RunTTs on a motor-driven treadmill fitted with a speed-controlling laser system. The supramaximal V̇O2 demand was estimated by linear extrapolation from the sub-maximal relationship between V̇O2 and speed, enabling computation of the accumulated oxygen deficit (AOD)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095065/monitoring-fatigue-status-in-elite-team-sport-athletes-implications-for-practice
#11
Robin T Thorpe, Greg Atkinson, Barry Drust, Warren Gregson
The increase in competition demands in elite team sports over recent years has prompted much attention from researchers and practitioners into the monitoring of adaptation and fatigue in athletes. Monitoring of fatigue and gaining an understanding of athlete status may also provide insights and beneficial information pertaining to player availability, injury and illness risk. Traditional methods used to quantify recovery and fatigue in team sports such as maximal physical performance assessments may not be feasible in order to detect variations in fatigue status throughout competitive periods...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095061/methods-of-monitoring-training-load-and-their-relationships-to-changes-in-fitness-and-performance-in-competitive-road-cyclists
#12
Dajo Sanders, Grant Abt, Matthijs K Hesselink, Tony Myers, Ibrahim Akubat
PURPOSE: The aim of this study was to assess the dose-response relationships between different training load methods and aerobic fitness and performance in competitive road cyclists. METHOD: Training data from 15 well-trained competitive cyclists were collected during a 10-week (December - March) pre-season training period. Before and after the training period, participants underwent a laboratory incremental exercise test with gas exchange and lactate measures and a performance assessment using an 8-min time trial (8MT)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051345/how-does-interval-training-prescription-impact-physiological-and-perceptual-responses
#13
Stephen Seiler, Øystein Sylta
The purpose of this study was to compare physiological responses and perceived exertion among well trained cyclists (n=63) performing three different high intensity interval training (HIIT) prescriptions differing in work bout duration and accumulated duration, but all prescribed with maximal session effort. Data are presented as mean(Standard Deviation). Subjects (male, 38(8) y, VO2peak 62(6) mL.kg(-1) min(-1)) completed up to 24 HIIT sessions over 12 weeks as part of a training intervention study. Sessions were prescribed as 4x16 min, 4x8 min, or 4x4 min with 2 min recovery periods (8 sessions of each prescription, balanced over time)...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051343/methodological-considerations-when-quantifying-high-intensity-efforts-in-team-sport-using-global-positioning-system-technology
#14
Matthew C Varley, Arne Jaspers, Werner F Helsen, James J Malone
Purpose Sprints and accelerations are popular performance indicators in applied sport. The methods used to define these efforts using athlete tracking technology could affect the number of efforts reported. The study aimed to determine the influence of different techniques and settings for detecting high-intensity efforts using Global Positioning System (GPS) data. Methods Velocity and acceleration data of a professional soccer match was recorded via 10-Hz GPS. Velocity data was filtered using either a median or exponential filter...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051341/effects-of-compression-garment-pressure-on-recovery-from-strenuous-exercise
#15
Jessica Hill, Glyn Howatson, Ken van Someren, David Gaze, Hayley Legg, Jack Lineham, Charles Pedlar
Compression garments are frequently used to facilitate recovery from strenuous exercise. Purpose To identify the effects of two different grades of compression garment on recovery indices following strenuous exercise. Methods Forty five recreationally active participants (n=26 males and n=19 females) completed an eccentric exercise protocol consisting of 100 drop jumps. Following the exercise protocol participants were matched for body mass and randomly but equally assigned to either a high (HI) compression pressure group, a low (LOW) compression pressure group, or a sham ultrasound group (SHAM)...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051335/managing-the-training-load-in-adolescent-athletes
#16
Andrew Murray
While historically adolescents were removed from their parents to prepare to become warriors, this process repeats itself in modern times but with the outcome being athletic performance. This review considers the process of developing athletes and managing load against the backdrop of differing approaches of conserving and maximizing the talent available. It acknowledges the typical training 'dose' that adolescent athletes receive across a number of sports and the typical 'response' when it is excessive or not managed appropriately...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051333/optimal-loading-for-maximising-power-during-sled-resisted-sprinting
#17
Matt R Cross, Matt Brughelli, Pierre Samozino, Scott R Brown, Jean-Benoit Morin
Purpose We sought to ascertain whether force-velocity-power relationships could be compiled from a battery of sled-resisted over-ground sprints, and to clarify and compare the optimal loading conditions for maximising power production for different athlete cohorts. Methods Recreational mixed-sport athletes (n=12) and sprinters (n=15) performed multiple trials of maximal sprints unloaded and towing a selection of sled masses (20-120% body-mass). Velocity data were collected by sports radar, and kinetics at peak velocity were quantified using friction coefficients and aerodynamic drag...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28051327/are-there-potential-safety-issues-concerning-the-safe-usage-of-electronic-personal-tracking-devices-the-experience-of-a-multi-sport-elite-club
#18
Daniel Medina, Eduard Pons, Antonio Gomez, Marc Guitart, Andres Martin, Jairo Vazquez-Guerrero, Ismael Camenforte, Berta Carles, Roger Font
Despite approval of the use of electronic personal tracking devices (EPTD) during competition by the International Football Association Board (IFAB), other team sport organizations and leagues have banned its use due to "safety concerns", with no evidence to support this assertion. The aim of the current brief report is to provide empirical evidence to support the wide-spread usage across all sports by examining safety issues concerning the use of EPTD in a multi-team sports club. A total of 5 outdoor football teams (first team, second team, under 19, under 18 and first team female) and 3 indoor multi-sport (basketball, futsal and handball) teams have been monitored; accounting for a total of 63...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27967337/peak-running-intensity-of-international-rugby-implications-for-training-prescription
#19
Jace A Delaney, Heidi R Thornton, John F Pryor, Andrew M Stewart, Ben J Dascombe, Grant M Duthie
PURPOSE: To quantify the duration and position-specific peak running intensities of international rugby union, for the prescription and monitoring of specific training methodologies. METHODS: Global positioning systems (GPS) were used to assess the activity profile of 67 elite-level rugby union players from two separate nations, across 33 international matches. A moving average approach was used to identify the peak relative distance (m∙min(-1)), average acceleration/deceleration (AveAcc; m∙s(-2)) and average metabolic power (Pmet) for a range of durations (1-10 min)...
December 14, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27967334/identification-of-sensitive-measures-of-recovery-following-external-load-from-football-match-play
#20
Amber E Rowell, Robert J Aughey, William G Hopkins, Andrew M Stewart, Stuart J Cormack
: Objective measures of recovery from football match-play could be useful for assessing athletes' readiness to train, if sensitive to preceding match load. PURPOSE: To identify the sensitivity of countermovement-jump (CMJ) performance and concentration of salivary testosterone and cortisol relative to elite football match load. METHODS: CMJ performance and salivary hormones were measured in 18 elite football players before (27-, 1-h) and after (0...
December 14, 2016: International Journal of Sports Physiology and Performance
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