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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/28787237/effect-of-body-composition-on-physiological-responses-to-cold-water-immersion-and-the-recovery-of-exercise-performance
#1
Jessica M Stephens, Shona L Halson, Joanna Miller, Gary J Slater, Dale W Chapman, Christopher D Askew
PURPOSE: To explore the influence of body composition on thermal responses to cold water immersion (CWI) and the recovery of exercise performance. METHODS: Male subjects were stratified into two groups; low fat (LF; n=10); or high fat (HF; n=10). Subjects completed a high intensity interval test (HIIT) on a cycle ergometer followed by 15 min recovery intervention (control (CON) or CWI). Core temperature (Tc), skin temperature (Tsk) and heart rate were recorded continuously...
August 8, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28787228/strengthening-the-practice-of-exercise-and-sport-science
#2
Israel Halperin, Andrew D Vigotsky, Carl Foster, David B Pyne
Exercise and sport sciences continue to grow as a collective set of disciplines by investigating a broad array of basic and applied research questions. Despite the progress, there is room for improvement. A number of problems pertaining to reliability and validity of research practices hinder advancement and the potential impact of the field. These problems include: 1) inadequate validation of surrogate outcomes, 2) too few longitudinal and 3) replication studies, 4) limited reporting of null or trivial results, and 5) insufficient scientific transparency...
August 8, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28771098/physical-preparation-recommendations-for-elite-rugby-sevens-performance
#3
Jake Schuster, Dan Howells, Julien Robineau, Anthony Couderc, Alex Natera, Nick Lumley, Tim J Gabbett, Nick Winkelman
Rugby Sevens, a new Olympic sport, features high intensity intermittent running and contact efforts over short match durations, normally six times across two to three days in a tournament format. Elite Rugby Sevens seasons often include over a dozen competitive tournaments across less than nine months, demanding deliberate and careful training-stress balance and workload management alongside development of the necessary physical qualities required for competition. Focus on running and repeated power skills, strength, and match-specific conditioning capacities is advised...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28771063/reliability-of-urinary-dehydration-markers-among-elite-youth-boxers
#4
Damir Zubac, Drazen Cular, Uros Marusic
PURPOSE: The aim of the present study was to determine the reliability and diagnostic accuracy of non-invasive urinary dehydration markers, in field-based settings on a day-to-day basis in elite adolescent amateur boxers. METHODS: Sixty-nine urine samples were collected on a day-to-day basis, from twenty-three athletes (17.3±1.9 y), during their weigh-stable phase and analyzed by field and laboratory measures of hydration status. Urine osmolality (UOSM), urine specific gravity (USG), total protein content (TPC) and body-mass (BM) stability were evaluated to determine fluid balance and hydration status...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28771061/comparison-of-performance-levels-and-sex-on-sprint-race-performance-in-the-biathlon-world-cup
#5
Harri Luchsinger, Jan Kocbach, Gertjan Ettema, Øyvind Sandbakk
Biathlon is an Olympic sport combining cross-country skiing with the skating technique and rifle shooting. The sprint (7.5 km for women and 10 km for men) includes two shootings between the three laps of skiing. The aims of the current study are to compare biathletes of different performance-levels and sex on total race time and performance-determining factors of sprint races in the biathlon World Cup. The top 10-performers (G1-10) and results within rank 21-30 (G21-30) in 47 sprint races during the 2011/2012 to 2015/2016 World Cup seasons were compared regarding total race time, course time, shooting time, range time, shooting performance (rate of hits) and penalty time...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28771051/the-role-of-the-rating-of-perceived-exertion-template-in-pacing
#6
Wouter Schallig, Tim Veneman, Dionne A Noordhof, José A Rodríguez-Marroyo, John P Porcari, Jos J de Koning, Carl Foster
The rating of perceived exertion (RPE) template is thought to regulate pacing and has been shown to be very robust in different circumstances. PURPOSE: The primary purpose was to investigate whether the RPE template can be manipulated by changing the race distance during the course of a time trial. The secondary purpose was to study how athletes cope with this manipulation, especially in terms of the RPE template. METHODS: Trained male subjects (N=10) performed three cycling time trials: a 10 km (TT10), a 15 km (TT15) and a manipulated 15 km (TTman)...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28771050/prediction-of-the-maximum-number-of-repetitions-and-repetitions-in-reserve-from-barbell-velocity
#7
Amador García-Ramos, Alejandro Torrejón, Belén Feriche, Antonio J Morales-Artacho, Alejandro Pérez-Castilla, Paulino Padial, Guy Gregory Haff
PURPOSE: This study aimed to provide two general equations to estimate (1) the maximum possible number of repetitions (XRM) from the mean velocity (MV) of the barbell, and (2) the MV associated with a given number of repetitions in reserve, as well as (3) to determine the between-sessions reliability of the MV associated with each XRM. METHODS: After the determination of the bench press one-repetition maximum (1RM: 1.15±0.21 kg·kg(-1) body mass), 21 men (age: 23...
August 3, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714774/small-sided-games-in-elite-soccer-does-one-size-fits-all
#8
Mathieu Lacome, Ben M Simpson, Yannick Cholley, Philippe Lambert, Martin Buchheit
PURPOSE: To compare the peak intensity of typical Small Sided Games (SSGs) with those of official matches in terms of running demands and mechanical work over different rolling average durations and playing positions. METHOD: Data were collected in 21 players (25±5 y, 181±7 cm, 77±7 kg) belonging to an elite French football team. SSG data were collected over two seasons during typical training sessions (249 files, 12±4 per player) and official matches (n=12)...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714767/comparison-of-methods-of-calculating-dynamic-strength-index
#9
Paul Comfort, Christopher Thomas, Thomas Dos'Santos, Paul A Jones, Timothy J Suchomel, John J McMahon
PURPOSE: To determine the reliability and variability of dynamic strength index (DSI) calculated from squat jump (SJ) (DSI-SJ) versus countermovement jump (CMJ) (DSI-CMJ) peak force (PF) and to compare DSI values between methods. METHODS: Male youth soccer and rugby league players (n = 27; age = 17.2 ± 0.7 years; height = 173.9 ± 5.7 cm; body mass = 71.1 ± 7.2 kg) performed 3 trials of the SJ, CMJ and isometric mid-thigh pull (IMTP), on two separate days. DSI was calculated by dividing the PF during each jump by the IMTP PF...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714760/houston-we-still-have-a-problem
#10
Martin Buchheit
Apollo 13 was initially looking like it would be the smoothest flight ever. After the explosion of an oxygen tank however, the astronauts were close to spending the rest of their lives in rotation around the planet. I wished to use this well-known incident to discuss further the link, or lack thereof, between sport sciences research and current field practices. There is a feeling that the academic culture and its publishing requirements have created a bit of an Apollo 13-like orbiting world (e.g., journals and conferences) that is mostly disconnected from the reality of elite performance...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714752/differences-in-the-load-velocity-profile-between-four-bench-press-variants
#11
Amador García-Ramos, Francisco Luis Pestaña-Melero, Alejandro Pérez-Castilla, Francisco Javier Rojas, Guy Gregory Haff
PURPOSE: This study aimed to compare the load-velocity relationship between four variants of the bench press (BP) exercise. METHODS: The full load-velocity relationship of 30 men were evaluated by means of an incremental loading test starting at 17 kg progressing to the individual one-repetition maximum (1RM) in four BP variants: concentric-only BP, concentric-only bench press throw (BPT), eccentric-concentric BP, and eccentric-concentric BPT. RESULTS: A strong and fairly linear relationship between mean velocity (MV) and %1RM was observed for the four BP variants (r(2) > 0...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714750/-hand-in-glove-using-qualitative-methods-to-connect-research-and-practice
#12
Liam D Harper, Robert McCunn
Recent work has espoused the idea that within applied sporting environments, 'fast' working practitioners should work together with 'slow' working researchers. However, due to economical and logistical constraints, such a coupling may not always be practical. Therefore, alternative means of combining research and applied practice are needed. A particular methodology, which has been utilized in recent years, is qualitative research. Examples of qualitative methods include the use of online surveys, one-on-one interviews, and focus groups...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714746/age-related-changes-in-endurance-performance-vary-between-modes-of-locomotion-in-men-an-analysis-of-master-world-records
#13
Romuald Lepers, Paul J Stapley, Thomas Cattagni
BACKGROUND: Age-related declines in sport performance are characteristic of all endurance and sprinting disciplines. However, it is not known if the mode of locomotion (i.e. swimming, cycling or running) influences the age-related decline in sport performance in sprinting and endurance events. METHODS: To examine the age-related decline in three different modes of locomotion (i.e. swimming, cycling and running) for endurance and sprint events, the world best performances achieved for males in the age-groups 18-39 years, 40-44 years, 45-49 years, 50-54 years, 55-59 years, 60-64 years, 65-69 years, 70-74 years, 75-79 years and 80-84 years, were compared in swimming (1500-m and 50-m), cycling (1-h and 200-m) and running (10-km and 100-m)...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714744/marathon-pace-control-in-masters-athletes
#14
Derek Breen, Michelle Norris, Robin Healy, Ross Anderson
PURPOSE: Pacing strategies are key to overall performance outcome in distance running events. Presently, no literature has examined pacing strategies utilised by masters athletes, of all running levels, during a competitive marathon. Therefore, this study aimed to examine masters athletes' pacing strategies, categorised by gender, age and performance level. METHODS: Data were retrieved from the 2015 TSC New York City Marathon for 31,762 masters athletes (20,019 men and 11,743 women)...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714743/an-alternate-test-of-tackling-ability-in-rugby-league-players
#15
Michael JAJ Speranza, Tim J Gabbett, David A Greene, Rich D Johnston, Andrew D Townshend, Brett O'Farrell
This study investigated the relationship between two tests of tackling ability, muscular strength and power in semi-professional rugby league players. Thirty-one players, 19 first grade and 12 second grade underwent tests of muscular strength (1 repetition maximum bench press, chin-up, and squat) and power (plyometric push-up and countermovement jump). Tackling ability was assessed via video analysis of under-the-ball and over-the-ball tackle drills. The first grade players had significantly greater scores in both the under-the-ball (P = 0...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714739/relationships-between-model-predicted-and-actual-match-performance-in-professional-australian-footballers-during-an-in-season-training-macrocycle
#16
Stuart R Graham, Stuart Cormack, Gaynor Parfitt, Roger Eston
PURPOSE: To assess and compare the validity of internal and external Australian Football (AF) training load measures for predicting match exercise intensity (MEI.min(-1)) and player rank score (PR(Score)) using a variable dose-response model. METHODS: 25 professional AF players (23 ± 3 y, 188.3 ± 7.2 cm and 87.7 ± 8.4 kg) completed a 24-week in-season macrocycle. In-season internal training and match load was quantified using session-RPE (sRPE) and external load from satellite and accelerometer data...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28657854/differences-between-relative-and-absolute-speed-and-metabolic-thresholds-in-rugby-league
#17
Tannath J Scott, Heidi R Thornton, Macfarlane T U Scott, Ben J Dascombe, Grant M Duthie
PURPOSE: This study compared relative and absolute speed and metabolic thresholds for quantifying match output in elite rugby league. METHODS: Twenty-six professional players competing in the National Rugby League (NRL) were monitored with global positioning systems (GPS) across a rugby league season. Absolute speed [moderate-intensity running (MIRTh >3.6 m·s(-1)); high intensity running (HIRTh > 5.2 m·s(-1))] and metabolic (>20 W·kg(-1)) thresholds were compared to individualised ventilatory [first (VT1IFT), and second (VT2IFT)] thresholds estimated from the 30-15 intermittent fitness test (30-15IFT), as well as the metabolic threshold associated with VT2IFT (HPmetVT2), to examine difference in match-play demands...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28657853/racing-an-opponent-alters-pacing-performance-and-muscle-force-decline-but-not-rpe
#18
Marco J Konings, Jordan Parkinson, Inge Zijdewind, Florentina J Hettinga
PURPOSE: Performing against a virtual opponent has been shown to invite a change in pacing and improve time trial (TT) performance. This study explored how this performance improvement is established by assessing changes in pacing, neuromuscular function and perceived exertion. METHODS: After a peak power output test and a familiarization TT, twelve trained cyclists completed two 4-km TTs in randomized order on a Velotron cycle ergometer. Time trial conditions were riding alone (NO), and riding against a virtual opponent (OP)...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28657821/a-scientific-approach-to-improve-physiological-capacity-of-an-elite-cyclist
#19
Bent R Rønnestad, Joar Hansen
Previous studies in endurance athletes has indicated that block periodization (BP) can be a good alternative to the more traditional organization of training despite the total volume and intensity of the training being similar. However, these studies usually last only 4-12 weeks. The aim of the present single-case study was to investigate the consequences of 58 weeks with systematic BP of low intensity training (LIT), moderate intensity training (MIT) and high intensity interval training (HIT) including incorporation of heavy strength training...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28657812/combined-prior-exercise-and-fast-start-improves-vo2-kinetics-and-cycling-performance
#20
Kirsty Brock, Prokopios Antonellis, Matthew I Black, Fred J DiMenna, Anni Vanhatalo, Andrew M Jones, Stephen J Bailey
PURPOSE: To investigate whether oxygen uptake (V̇o2) kinetics and simulated 4-km cycling performance are synergistically improved by prior 'priming' exercise and an all-out starting strategy. METHODS: Nine males completed four target work trials (114 ± 17 kJ) to assess V̇o2 kinetics and cycling performance in a repeated-measures, cross-over experimental design. Trials were initiated with either a 12-s all-out start or a self-selected start and preceded by prior severe-intensity (70%Δ) priming exercise or no priming exercise...
June 28, 2017: International Journal of Sports Physiology and Performance
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