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International Journal of Sports Physiology and Performance

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February 15, 2019: International Journal of Sports Physiology and Performance
Ted Polglaze, Matthias W Hoppe
The ability of the "metabolic power" model to assess the demands of team-sport activity has been the subject of some interest-and much controversy-in team-sport research. Because the cost of acceleration depends on the initial speed and the costs of acceleration and deceleration are not "equal and opposite," changes in speed must be accounted for when evaluating variable-speed locomotion. The purpose of this commentary is to address some of the misconceptions regarding "metabolic power," acknowledge its limitations, and highlight some of the benefits that energetic analysis offers over alternative approaches to quantifying the demands of team sports...
February 7, 2019: International Journal of Sports Physiology and Performance
Farid Farhani, Hamid Rajabi, Raoof Negaresh, Ajmol Ali, Sadegh Amani Shalamzari, Julien S Baker
PURPOSE: This study examined the validity and reliability of a novel futsal special performance test (FSPT) as a measure of futsal performance and skills. METHODS: Thirty six futsal players with different levels of experience were recruited and divided into two groups (elite and non-elite). Players participated in four sessions (at least 7 days apart); a) familiarization session, b) anaerobic power (Wingate test), c) FSPT trial 1, and d) FSPT trial 2. The FSPT was carried out on a futsal court (wooden sprung floor) and examined skills such as dribbling, rotation, long and short passing and shooting...
January 31, 2019: International Journal of Sports Physiology and Performance
Tiago Turnes, Rafael Penteado Dos Santos, Rafael Alves De Aguiar, Thiago Loch, Leonardo Trevisol Possamai, Fabrizio Caputo
PURPOSE: The present study aimed to compare the intensity and physiological responses of deoxygenated hemoglobin breaking-point ([HHb]BP) and anaerobic threshold (AnT) during incremental test and to verify its association with 2000-m rowing ergometer performance in well-trained rowers. METHODS: Thirteen male rowers (mean ± SD, age: 24 ± 11 years; V̇O2 peak: 63.7 ± 6.1 mL.Kg.min-1 ) performed a step incremental test. Gas exchange, vastus lateralis [HHb] and blood lactate concentration were collected...
January 31, 2019: International Journal of Sports Physiology and Performance
Thomas Reeve, Ralph Gordon, Paul B Laursen, Jason K W Lee, Christopher J Tyler
PURPOSE: To investigate the effects of short-term, high-intensity interval training (HIIT) on heat acclimation (HA). METHODS: Male cyclists/triathletes were assigned into either an HA (n = 13) or a comparative (COMP, n = 10) group. HA completed 3 cycling heat-stress tests to exhaustion (60% Wmax ) (HST1, pre-HA; HST2, post-HA; HST3, 7 d post-HA). HA consisted of 30-min bouts of HIIT cycling (6 min at 50% Wmax then 12 x 1 min 100%-Wmax bouts with 1 min rest between bouts) on 5 consecutive days...
January 31, 2019: International Journal of Sports Physiology and Performance
Luana T Rossato, Camila T M Fernandes, Públio F Vieira, Flávia M S de Branco, Paula C Nahas, Guilherme M Puga, Erick P de Oliveira
BACKGROUND: Carbohydrate (CHO) mouth rinse has been used as an ergogenic strategy due to its central effect; however, the effects of this intervention in short and high-intensity exercises are not fully understood. PURPOSE: We aimed to investigate the effect of CHO mouth rinse on time to exhaustion in a short and high-intensity exercise performed on a treadmill. METHODS: A randomized double-blind, placebo-controlled, and crossover study was conducted with 10 (24...
January 31, 2019: International Journal of Sports Physiology and Performance
Filip Sabol, Jozo Grgic, Pavle Mikulic
PURPOSE: To examine the acute effects of three doses of caffeine on upper- and lower-body ballistic exercise performance, and to explore if habitual caffeine intake impacts the acute effects of caffeine ingestion on ballistic exercise performance. METHODS: Twenty recreationally active male participants completed medicine ball throw and vertical jump tests under four experimental conditions (placebo, 2, 4, and 6 mg·kg-1 of caffeine). RESULTS: One-way repeated measures ANOVA with subsequent post hoc analyses indicated that performance in the medicine ball throw test improved, compared to placebo, only with a 6 mg·kg-1 dose of caffeine (P=0...
January 31, 2019: International Journal of Sports Physiology and Performance
Dennis van Erck, Eric J Wenker, Koen Levels, Carl Foster, Jos J de Koning, Dionne A Noordhof
PURPOSE: To investigate the effect of altitude on GE at the same relative exercise intensity and the same absolute power output (PO). Additionally, we sought to determine the effect of altitude on the change in GE during high-intensity exercise. METHODS: Twenty-one trained males performed three maximal incremental tests and five GE-tests, at sea level, 1500 m and 2500 m of acute simulated altitude. The GE-tests at altitude were performed once at the same relative exercise intensity and once at the same absolute PO as at sea level...
January 31, 2019: International Journal of Sports Physiology and Performance
Daniel G Hursh, Marissa N Baranauskas, Chad C Wiggins, Shane Bielko, Timothy D Mickleborough, Robert F Chapman
PURPOSE: To determine whether chronic IMT improves submaximal exercise performance with acute hypoxic exposure. METHODS: Fourteen endurance-trained men completed a 20km cycling time trial (TT) in normobaric hypoxia (FI O2 =0.16) before and after either 6wk of an IMT protocol consisting of inspiratory loads equivalent to 80% of sustained maximal inspiratory pressure ((SMIP); n=9), or a SHAM protocol (30% of SMIP; n=5). RESULTS: In the IMT group, 20km TT performance significantly improved by 1...
January 31, 2019: International Journal of Sports Physiology and Performance
Brian J McMorrow, Massimiliano Ditroilo, Brendan Egan
PURPOSE: Resisted sled sprinting (RSS) is an effective tool for improving sprint performance over short distances, but the effect on change-of-direction (COD) performance is largely unknown. The present study investigated the effect of heavy RSS training during the competitive season on sprint and COD performance in professional soccer players. METHODS: Over six weeks in-season, a RSS training group (n=6) performed RSS at a sled load of 30% of body mass for a total programme running distance of 800 m, while an unresisted sprint (URS) training group (n=7) performed the same distance of unresisted sprinting...
January 31, 2019: International Journal of Sports Physiology and Performance
Francisco J Amaro-Gahete, Lucas Jurado-Fasoli, Alejandro R Triviño, Guillermo Sanchez-Delgado, Alejandro de la O, Jørn W Helge, Jonatan R Ruiz
PURPOSE: To analyze the diurnal variation of maximal fat oxidation (MFO) and the intensity that elicit MFO (Fatmax ) in trained male athletes. METHODS: A total of 12 endurance-trained male athletes aged 24.7±4.1 participated in the study. We measured MFO, Fatmax , maximum oxygen uptake (VO2 max) and oxygen uptake percentage at ventilatory threshold 2 (VT2) with a graded exercise protocol performed on two days separated by one week. One test was performed in the morning and the other in the afternoon...
January 31, 2019: International Journal of Sports Physiology and Performance
Iñigo Mujika, Luis Villanueva, Marijke Welvaert, David B Pyne
PURPOSE: To quantify the pattern of change in performance between season best qualifying time and the major championships of the year, and assess the influence of time between performance peaks, ranking at the major events, stroke, event distance, sex, age, and country. METHODS: A total of 7,832 official competition times recorded at 4 FINA World Championships and 2 Olympic Games between 2011 and 2017 were compared with each swimmer's season best time prior to the major event of the year...
January 31, 2019: International Journal of Sports Physiology and Performance
Patrick Ward, Johann Windt, Thomas Kempton
The application of scientific principles to inform practice has become increasingly common in professional sports, with increasing numbers of sport scientists operating in this area. We believe that in addition to domain specific expertise, effective sport scientists working in professional sport should be able to develop systematic analysis frameworks to enhance performance within their organisation. While statistical analysis is critical to this process, it depends on proper data collection, integration and storage...
January 31, 2019: International Journal of Sports Physiology and Performance
Gareth N Sandford, Simon A Rogers, Avish P Sharma, Andrew E Kilding, Angus Ross, Paul B Laursen
PURPOSE: The anaerobic speed reserve (ASR) defined as the speed range from vVO2 max to maximal sprint speed (MSS) has recently been shown to be an important tool for middle-distance coaches to meet event surge demands and inform on the complexity of athlete profiles. To enable field application of ASR, the relationship between gun-to tape 1500 m average speed (1500v ) and the velocity associated with maximal oxygen uptake (vVO2 max) for the determination of lower landmark of the ASR was assessed in elite middle-distance runners...
January 31, 2019: International Journal of Sports Physiology and Performance
Carolina F Wilke, Felipe Augusto P Fernandes, Flávio Vinícius C Martins, Anísio M Lacerda, Fabio Y Nakamura, Samuel P Wanner, Rob Duffield
PURPOSE: To investigate the classification of faster vs slower recovery profiles in elite futsal players and factors that distinguish between them. METHODS: Twenty-two male futsal players were evaluated for the time-course of post-training recovery in countermovement jump (CMJ), 10m sprint, creatine kinase concentration (CK), total quality recovery (TQR) and Brunel Mood Scale (fatigue and vigor) before, post, 3, 24 and 48h after a high-intensity training session...
January 31, 2019: International Journal of Sports Physiology and Performance
Nick Dobbin, Jamie Highton, Samantha L Moss, Craig Twist
PURPOSE: To assess a standardised testing battery's ability to differentiate anthropometric and physical qualities between youth, academy and senior rugby league players, and determine the discriminant validity of the battery. METHODS: A total of 729 rugby league players from multiple clubs within England categorised as youth (n = 235), academy (n = 362) and senior (n = 132) players completed a standardised testing battery that included the assessment of anthropometric and physical characteristics during preseason...
January 31, 2019: International Journal of Sports Physiology and Performance
Arne Jaspers, Tim Op De Beéck, Michel S Brink, Wouter G P Frencken, Filip Staes, Jesse J Davis, Werner F Helsen
PURPOSE: The influence of preceding load and perceived wellness on the future perceived wellness of professional soccer players is unexamined. This paper simultaneously evaluates the external and internal load for different time frames in combination with pre-session wellness to predict future perceived wellness using machine learning techniques. METHODS: Training and match data were collected from a professional soccer team. The external load was measured using global positioning system technology and accelerometry...
January 31, 2019: International Journal of Sports Physiology and Performance
Thomas Dos'Santos, Paul A Jones, Jonathan Kelly, John J McMahon, Paul Comfort, Christopher Thomas
PURPOSE: Skeletal-muscle function can be evaluated using force-times curves generated via the isometric midthigh pull (IMTP). Various sampling frequencies (500-1000 Hz) have been used for IMTP assessments; however, no research has investigated the influence of sampling frequency on IMTP kinetics. Therefore, the purpose of this study was to investigate the influence of sampling frequency on kinetic variables during the IMTP, including peak force, time-specific force values (100, 150, and 200 ms), and rate of force development (RFD) at 3 time bands (0-100, 0-150, 0-200 ms)...
January 25, 2019: International Journal of Sports Physiology and Performance
Lachlan Jg Mitchell, Ben Rattray, Paul Wu, Philo U Saunders, David B Pyne
PURPOSE: Critical speed (CS) and supra-CS distance capacity (D') are useful metrics for monitoring changes in swimmers' physiological and performance capacities. However, the utility of these metrics across a season has not been systematically evaluated in high level swimmers. METHODS: Twenty-seven swimmers (18 female; age 19.1 ± 2.9 y, 9 male; 19.5 ± 1.9 y, mean ± SD) completed the 12x25m swimming test multiple times (4 ± 3 tests/swimmer) across a two-year period...
January 24, 2019: International Journal of Sports Physiology and Performance
David Rodríguez-Osorio, Oliver Gonzalo-Skok, Fernando Pareja-Blanco
PURPOSE: to compare the effects of resisted change of direction (COD) movements, using several relative loads, on soccer players' physical performance. METHODS: Fifty-four male soccer players were randomly assigned to one of the following 3 groups, which differed only in the magnitude of the external load used during the COD training: COD training without external load (COD-0; n = 16); COD training with a 12.5% body mass (BM) external load (COD-12.5; n = 19); and COD training with a 50% BM external load (COD-50; n = 19)...
January 24, 2019: International Journal of Sports Physiology and Performance
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