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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/28422588/alterations-in-redox-homeostasis-during-recovery-from-unexplained-underperformance-syndrome-in-an-elite-international-rower
#1
Nathan A Lewis, Ann Redgrave, Mark Homer, Richard Burden, Wendy Martinson, Brian Moore, Charles R Pedlar
PURPOSE: This case study of an international rower examines a diagnosis of Unexplained Under Performance Syndrome (UUPS or Overtraining Syndrome) describing a full recovery and return to elite competition the same year. METHODS: On diagnosis and 4 and 14 months post-diagnosis, detailed assessments including physiological, nutritional, and biomarkers were made. RESULTS: Clinical examination and laboratory results for haematology, biochemistry, thyroid function, immunology, vitamins and minerals were unremarkable and did not explain the presentation and diagnosis...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422586/the-reactive-strength-index-reflects-vertical-stiffness-during-drop-jumps
#2
Kristof Kipp, Michael T Kiely, Matthew D Giordanelli, Philip J Malloy, Christopher F Geiser
The reactive strength index (RSI) is often used to quantify drop jump (DJ) performance; however, not much is known about the biomechanical determinants of the RSI. The purpose of this study was to investigate the correlations between the RSI and several biomechanical variables calculated from DJ performed with different initial drop heights. Twelve, male NCAA DI basketball players performed DJ from drop heights of 30, 45, and 60 cm. Force plates were used to calculate DJ performance parameters (i.e., DJ height, contact time, and RSI) and DJ biomechanical variables (i...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422583/game-simulation-drill-design-alters-the-speed-profiles-of-wheelchair-rugby-players
#3
James M Rhodes, Barry S Mason, Thomas A W Paulson, Victoria L Goosey-Tolfrey
PURPOSE: This study examined the speed profiles of elite wheelchair rugby (WCR) players during game-simulation training drills of differing player number and shot-clock regulations. A secondary aim was to determine whether the profiles were further influenced by players classification. METHODS: Eight elite WCR players (low-point n = 3; high-point n = 5) were monitored using a radio-frequency based, indoor tracking system during training sessions over a 5-month period...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422557/maximal-aerobic-power-in-aging-men-insights-from-1-hour-cycling-unaccompanied-record
#4
Carlo Capelli
PURPOSE: We analyzed best 1-hour unaccompanied performances of Master athletes in ages ranging from 35 to 105 years in order to estimate the decay of Maximal Aerobic Power (MAP) across the spectrum of age. METHODS: MAP at the various ages was estimated by computing the metabolic power ( RESULTS: MAP started monotonically decreasing at 47 years of age. Thereafter, it showed an average percent rate of decrease of about 14 % for decade up to 105 years of age, similarly to other classes of Master athletes...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422546/competition-sleep-is-not-compromised-compared-to-habitual-in-elite-australian-footballers
#5
Benita J Lalor, Shona L Halson, Jacquie Tran, Justin G Kemp, Stuart J Cormack
PURPOSE: To assess the impact of match start time and days relative to match compared to the habitual sleep characteristics of elite Australian Football (AF) players. METHODS: 45 elite male AF players were assessed during the pre-season (habitual) and across four home matches during the season. Players wore an activity monitor the night before (-1), night of (0), one night after (+1), and two nights (+2) after each match and completed a self-reported rating of sleep quality...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422539/the-effect-of-nitrate-supplementation-on-cycling-performance-in-the-heat-in-well-trained-cyclists
#6
Joseph A McQuillan, Julia R Casadio, Deborah K Dulson, Paul B Laursen, Andrew E Kilding
PURPOSE: The aim of this study was to determine the effect of NO3(-) consumption on measures of perception, thermoregulation and cycling performance in hot conditions. METHODS: Using a randomised, double-blind, crossover-design, 8 well-trained cyclists (mean ± SD: age: 25 ± 8 y, V̇O2peak: 64 ± 5 ml·kg(-1)·min(-1)) performed 2 separate trials, in hot (35°C, 60% relative humidity) environments, having ingested either 140 ml NO3(-)-rich beetroot juice ~8 mmol NO3(-) (NIT), or placebo (PLA), daily for 3-days with a 7-day washout period separating trials...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422525/soccer-match-play-represents-an-important-component-of-the-power-training-stimulus-in-premier-league-players
#7
Ryland Morgans, Rocco Di Michele, Barry Drust
PURPOSE: Competitive match-play is a dominant component of the physical load completed by soccer players within a training micro-cycle. Characterising the temporal disruption in homeostasis that follows exercise may provide some insight into the potential for match-play to elicit an adaptive response. METHODS: Countermovement jump (CMJ) performance was characterised 3 days post-match for 15 outfield players from an English Premier League soccer team (age: 25.8 ± 4...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422524/straight-line-and-change-of-direction-intermittent-running-in-professional-soccer-players
#8
Mohamed S Fessi, Fayçal Farhat, Alexandre Dellal, James J Malone, Wassim Moalla
PURPOSE: The present study aimed to investigate the difference between straight-line (STL) and change of direction (COD) intermittent running exercises in soccer players. METHODS: Seventeen male professional soccer players performed the agility T-test and 6 intermittent running exercises: 10s at 130% of maximal aerobic speed (MAS) alternated with 10s of rest (10-10), 15s at 120% of MAS alternated with 15s of rest (15-15) and 30s at 110% of MAS alternated with 30s of rest (30-30) both in STL and with COD...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422523/can-the-lamberts-submaximal-cycle-test-reflect-overreaching-in-professional-cyclists
#9
Lieselot Decroix, Robert P Lamberts, Romain Meeusen
PURPOSE: The Lamberts and Lambert Submaximal Cycle Test (LSCT) consists of 3 stages during which cyclist's cycle for 6 minutes at 60%, 6 minutes at 80% and 3 minutes at 90% of their maximal heart rate, followed by one-minute recovery. It was the aim of this study to determine if the LSCT is able to reflect a state of functional overreaching in professional female cyclists during an 8-day training camp and the following recovery days. METHODS: Six professional female cyclists performed an LSCT on day 1, day 5 and day 8 of the training camp and 3 days after the training camp...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28422520/low-level-laser-therapy-improves-performance-and-reduces-fatigue-in-competitive-cyclists
#10
Fábio J Lanferdini, Rodrigo R Bini, Bruno M Baroni, Kelli D Klein, Felipe P Carpes, Marco A Vaz
Evidence supports that low-level laser therapy (LLLT) minimizes fatigue effects on muscle performance. However, the ideal LLLT dosage to improve athletes' performance during sports activities, such as cycling, is still unclear. Therefore, the goal of this study was to investigate the effects of different LLLT dosages on cyclists' performance in time-to-exhaustion tests. In addition, we looked at the effects of LLLT on the frequency content of the EMG signals to assess fatigue mechanisms. Twenty male competitive cyclists participated in a crossover, randomized, double-blind and placebo-controlled trial...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338378/validation-of-a-maximal-incremental-skating-test-performed-on-a-slide-board-comparison-with-treadmill-skating
#11
Tatiane Piucco, Fernando Diefenthaeler, Rogério Soares, Juan M Murias, Guillaume Y Millet
PURPOSE: the aim of this study was to investigate the criterion validity of a maximal incremental skating test performed on a slide board (SB). METHODS: Twelve sub-elite speed skaters performed a maximal skating test on a treadmill and on a SB. Gas exchange threshold (GET), respiratory compensation point (RCP) and maximal variables were determined. RESULTS: oxygen uptake (V̇O2) (31.0 ± 3.2 and 31.4 ± 4.1 mL∙min(-1)∙kg(-1)), percentage of maximal oxygen uptake (V̇O2max) (66...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338375/an-updated-review-of-the-applied-physiology-of-american-collegiate-football-the-physical-demands-strength-conditioning-nutritional-considerations-and-injury-characteristics-of-america-s-favourite-game
#12
Hugh H K Fullagar, Robert McCunn, Andrew Murray
Whilst there are various avenues for performance improvement within collegiate American football (AF), there is no comprehensive evaluation of the collective array of resources around performance, physical conditioning and injury and training/game characteristics to guide future research and inform practitioners. Accordingly, the aim of the present review was to provide a current examination of these areas within collegiate AF. Recent studies show that there is a wide range of body compositions and strength characteristics between players, which appear to be influenced by playing position, level of play, training history/programming and time of season...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338371/reliability-and-seasonal-changes-of-submaximal-variables-to-evaluate-professional-cyclists
#13
Jose A Rodríguez-Marroyo, Raúl Pernía, José G Villa, Carl Foster
PURPOSE: The aim of this study was to determine the reliability and validity of several submaximal variables that can be easily obtained by monitoring cyclists' performance. METHODS: Eighteen professional cyclists participated in this study. In a first part (n=15) the test-retest reliability of HR and RPE during a progressive maximal test was measured. Derived submaximal variables based on HR, RPE and power output (PO) responses were analyzed. In a second part (n=7) the pattern of the submaximal variables according to cyclists' training status was analyzed...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338366/effects-of-bout-duration-on-players-internal-and-external-loads-during-small-sided-games-in-young-soccer-players
#14
Yusuf Köklü, Utku Alemdaroğlu, Hamit Cihan, Del P Wong
PURPOSE: This study investigated the effects of different bout durations on internal and external loads of young soccer players during different small-sided games (SSGs). METHOD: Fifteen male young soccer players (average age 17 ± 1 years) participated in 2 vs 2, 3 vs 3 and 4 vs 4 SSGs. All games lasted 12 min playing time in total, but each SSG format further consisted of four bout durations: continuous (CON: 1 bout x 12 min) or interval with short (SBD: 6 bouts x 2 min), medium (MBD: 3 bouts x 4 min) or long (LBD: 2 bouts x 6 min) bout durations...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338365/movement-velocity-as-indicator-of-relative-intensity-and-level-of-effort-attained-during-the-set-in-pull-up-exercise
#15
Miguel Sánchez-Moreno, David Rodríguez-Rosell, Fernando Pareja-Blanco, Ricardo Mora-Custodio, Juan José González-Badillo
PURPOSE: to analyze the relationship between movement velocity and relative load (%1RM) in the pull-up exercise (PU), and to determine the pattern of repetition velocity loss during a single set to failure in pulling one's own body mass. METHODS: Fifty-two men (age = 26.5 ± 3.9 years, body mass = 74.3 ± 7.2 kg) performed a first evaluation (T1) consisting of an one-repetition maximum test (1RM), and a test of maximum number of repetitions to failure pulling one's own body mass (MNR) in the PU exercise...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338363/decrement-in-professional-cyclists-performance-after-a-grand-tour
#16
Jose A Rodríguez-Marroyo, José G Villa, Raúl Pernía, Carl Foster
PURPOSE: The aim of this study was to analyze professional cyclists' performance decline after, and the exercise demands during, a Grand Tour. METHOD: Seven professional cyclists performed two incremental exercise tests, 1-week before and the day after the Vuelta España. During the race the exercise demands were analyzed on the basis of the HR. Three intensity zones were established according to reference HR values corresponding to the ventilatory (VT) and respiratory compensation (RCT) thresholds determined during the pre-race test...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338362/the-effects-of-caffeine-taurine-or-caffeine-taurine-co-ingestion-on-repeat-sprint-cycling-performance-and-physiological-responses
#17
Rory Warnock, Owen Jeffries, Stephen Patterson, Mark Waldron
PURPOSE: This study investigated the effects of caffeine (C), taurine (T), caffeine and taurine co-ingestion (C+T) or placebo (P) on repeated Wingate cycling performance and associated physiological responses. METHODS: Seven male team sports players participated in a randomised, single-blind, cross-over study, where they completed three Wingate tests, each separated by 2-min, an hour after ingesting: C (5 mg/kg BM), T (50 mg/kg BM), C+T (5 mg/kg BM + 50 mg/kg BM) or P (5 mg/kg BM) in a gelatine capsule...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338361/method-induced-differences-of-energy-contributions-in-adolescent-female-kayaking
#18
Yongming Li, Margot Niessen, Xiaoping Chen, Ulrich Hartmann
Purpose Different relative aerobic energy contribution (WAER%) has been reported for the two female Olympic kayaking disciplines (i.e. 200 and 500m). The purpose of this study was to investigate whether the adopted method of energy calculation influenced the value of WAER% during the kayaking time trials. Methods Eleven adolescent female kayakers (age 14±1 yrs, height 172±4 cm, body mass 65.4±4.2 kg, VO2peak 42.6±4.9 ml·min(-1)·kg(-1), training experience 1.5±0.3 yrs) volunteered to participate in one incremental exercise test and two time trials (40s and 120s) on the kayak ergometer...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338359/optimizing-the-team-for-required-power-during-track-cycling-team-pursuit
#19
Levi Heimans, Wouter R Dijkshoorn, Marco J M Hoozemans, Jos J de Koning
PURPOSE: Since the aim of the men's team pursuit in time trial track cycling is to accomplish a distance of 4000m as fast as possible, optimizing aerodynamic drag can contribute to achieving this goal. The aim of this study is to determine the drafting effect in second, third and fourth position during the team pursuit in track cycling as a function of the team members' individual frontal areas in order to minimize the required power. METHOD: Eight experienced track cyclists of the Dutch national selection performed 39 trials of 3-km in different teams of four cyclists at a constant velocity of 15...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28338357/neuromuscular-fatigue-after-repeated-jumping-with-concomitant-electrical-stimulation
#20
Daria Neyroud, Jimmy Samararatne, Bengt Kayser, Nicolas Place
PURPOSE: We evaluated the etiology and extent of neuromuscular fatigue induced by fifty squat jumps performed with and without neuromuscular electrical stimulation (NMES) of the knee extensors. METHODS: Nine healthy recreationally active males (24 ± 2 years old) took part in two experiments. These consisted of fifty squat jumps performed with stimulation (NMES) or without (CON). Maximal voluntary contraction (MVC) force, maximal voluntary activation level (VAL) and forces evoked by single and double (10 and 100 Hz) stimulations were recorded before and after the fifty jumps...
March 24, 2017: International Journal of Sports Physiology and Performance
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