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International Journal of Sports Physiology and Performance

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https://www.readbyqxmd.com/read/30427251/joint-level-analyses-of-the-back-squat-with-and-without-intra-set-rest
#1
Jason D Stone, Adam C King, Shiho Goto, John D Mata, Joseph Hannon, James C Garrison, James Bothwell, Andrew R Jagim, Margaret T Jones, Jonathan M Oliver
PURPOSE: To provide a joint level analysis of traditional (TS) and cluster (CS) set structure during the back squat exercise. METHODS: Eight men (24±3 y; 177.3±7.9 cm; 82.7±11.0 kg; 11.9±3.5 %bodyfat; 150.3±23.0 kg one-repetition maximum [1RM]) performed the back squat exercise (80%1RM) using TS (4 x 6, 2 min inter-set rest) and CS (4 x [2 x 3], 30-sec intra-set rest, 90-sec inter-set rest), randomly. Lower limb kinematics were collected by motion capture as well as kinetic data via bilateral force platforms...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427249/the-within-subject-correlation-between-salivary-iga-and-measures-of-training-load-in-elite-football-players
#2
Pedro Figueiredo, George P Nassis, João Brito
PURPOSE: To quantify the association between salivary secretory immunoglobulin A (sIgA) and training load in elite football players. METHODS: Data were obtained in four consecutive days during the preparation camp for the Rio 2016 Olympic Games. Saliva samples of 18 elite male football players were collected prior to breakfast. The session rating of perceived exertion (s-RPE) and external training load metrics from GPS were recorded. Within-subject correlation coefficients between training load and sIgA concentration, and magnitude of relationships were calculated...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427248/peripheral-muscle-function-during-repeated-changes-of-direction-in-basketball
#3
Davide Ferioli, Ermanno Rampinini, Andrea Bosio, Antonio La Torre, Nicola A Maffiuletti
PURPOSE: To examine differences between adult male basketball players of different competitive levels (study 1) and changes over a basketball season (study 2) of knee extensor peripheral muscle function during a multi-stage changes of direction exercise (MCODE). METHODS: In study 1, 111 players from 4 different divisions completed the MCODE during the regular season. In study 2, the MCODE was performed before (T1) and after (T2) the preparation period and during the competitive season (T3) by 32 players from division I, II and III...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427247/snp-panel-population-genetics-approach-based-in-1000genomes-and-elite-soccer-players
#4
Gustavo Monnerat, Alex S Maior, Marcio Tannure, Lia K F C Back, Caleb G M Santos
PURPOSE: Soccer is one of the most popular sport worldwide, a physical activity of great physiological demand and complexity. Currently, numerous trials involving physiological responses such as hypertrophy, energy expenditure, vasodilation, cardiac output, VO2 max, and recovery supported the possibility of genomic predictors affecting performance. In a complementary way to association studies with SNPs, the objective was evaluate if the use of population genetics data from human genomics databases can provide information for a better understanding of relationship between heritability and sports performance...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427246/no-effect-of-beetroot-juice-supplementation-on-100-m-and-200-m-swimming-performance-in-moderately-trained-swimmers
#5
Ozcan Esen, Ceri Nicholas, Mike Morris, Stephen J Bailey
PURPOSE: Dietary nitrate supplementation has been reported to improve performance in kayaking and rowing exercise which mandate significant recruitment of the upper body musculature. Since the effect of dietary nitrate supplementation on swimming performance is unclear, the purpose of this study was to assess the effect of dietary nitrate supplementation on 100-m and 200-m swimming freestyle time-trial (TT) performance. METHODS: In a double blind, randomized crossover design, ten moderately-trained swimmers underwent two separate 3-day supplementation periods, with a daily dose of either 140 mL nitrate-rich (BRJ; ~800 mg/d nitrate) or nitrate-depleted (PLA) BRJ...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427245/physical-load-in-soccer-strengths-and-limitations-of-three-different-methods
#6
Karin Fischer-Sonderegger, Wolfgang Taube, Martin Rumo, Markus Tschopp
PURPOSE: This study investigates the strengths and limitations of different indicators to measure physical load. Furthermore, indicators were evaluated for discrimination between performance levels and playing positions. METHODS: Ninety positional match files from 70 elite players and 91 match files from 69 sub-elite players were collected during 14 official under-18 matches using a local position measurement system. Indicators are calculated from either speed, absolute acceleration (acc-abs), or percentage acceleration (acc-%)...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427244/reducing-aerodynamic-drag-by-adopting-a-novel-road-cycling-sprint-position
#7
Paul F J Merkes, Paolo Menaspà, Chris R Abbiss
PURPOSE: To assess the influence of a seated, standing, and forward standing cycling sprint position on aerodynamic drag CdA and the reproducibility of a field test of CdA calculated in these different positions. METHODS: Eleven recreational male road cyclists rode 250 m in two directions at around 25, 32, and 40 km·h-1 and in each of the three positions, resulting in a total of 18 efforts per participant. Riding velocity, power output, wind direction and velocity, road gradient, temperature, relative humidity, and barometric pressure were measured and used to calculate CdA use regression analysis...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427243/impaired-heat-adaptation-from-combined-heat-training-and-live-high-train-low-hypoxia
#8
Erin L McCleave, Katie M Slattery, Rob Duffield, Philo U Saunders, Avish P Sharma, Stephen Crowcroft, Aaron J Coutts
PURPOSE: To determine whether combining training in heat with 'Live High, Train Low' hypoxia (LHTL) further improves thermoregulatory and cardiovascular responses to a heat tolerance test compared to independent heat training. METHODS: Twenty-five trained runners (VO2peak = 64.1 ±8.0 ml·min·kg-1 ) completed three-weeks training in one of three conditions: 1) Heat training combined with LHTL (H+H; FiO2 =14.4% (3000 m), 13 h·day-1 ; train at <600 m, 33°C, 55% RH); 2) heat training (HOT; live and train <600 m, 33°C, 55% RH); 3) temperate training (CONT; live and train <600 m, 13°C, 55% RH)...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427242/the-influence-of-hamstring-muscle-peak-torque-and-rate-of-torque-development-for-sprinting-performance-in-football-players-a-cross-sectional-study
#9
Lasse Ishøi, Per Aagaard, Mathias F Nielsen, Kasper B Thornton, Kasper K Krommes, Per Hölmich, Kristian Thorborg
PURPOSE: This cross-sectional study aimed to investigate the association between hamstring muscle peak torque and rapid force capacity (rate of torque development: RTD) versus sprint performance in elite youth football players. METHODS: Thirty elite academy youth football players (16.75 ± 1.1 years, 176.9 ± 6.7 cm, 67.1 ± 6.9 kg) were included. Isometric peak torque (Nm/kg) and early (0-100 ms) and late (0-200 ms) phase RTD (RTD100 , RTD200 ) (Nm/s/kg) of the hamstring muscles were obtained as independent predictor variables...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427241/understanding-the-impact-of-trunk-and-arm-impairment-on-wheelchair-rugby-performance-during-competition
#10
Barry S Mason, Viola C Altmann, Victoria L Goosey-Tolfrey
PURPOSE: To determine the effect of trunk and arm impairment on physical and technical performance during wheelchair rugby (WR) competition. METHODS: Thirty-one highly trained WR players grouped according to their trunk (no trunk [NT]; some trunk [T] function) and arm impairment (poor [PAF]; moderate [MAF]; good [GAF] arm function) participated in 5 WR matches. Player's physical (wheelchair mobility) and technical (ball handling) activities were analysed using an indoor tracking system and video analysis respectively...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427240/training-load-and-baseline-characteristics-associated-with-new-injury-pain-within-an-endurance-sporting-population-a-prospective-study
#11
Richard Johnston, Roisin Cahalan, Laura Bonnett, Matthew Maguire, Alan Nevill, Philip Glasgow, Kieran O'Sullivan, Thomas Comyns
PURPOSE: To determine the association between training load (TL) factors, baseline characteristics and new injury and/or pain (IP) risk within an endurance sporting population (ESP). METHODS: Ninety-five endurance sporting participants from running, triathlon, swimming, cycling and rowing disciplines. Participants initially completed a questionnaire capturing baseline characteristics. TL and IP data was submitted weekly over a 52-week study period. Cumulative TL factors, Acute:Chronic Workload Ratios (ACWR) and Exponentially Weighted Moving Averages (EWMA) were calculated...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427238/circulation-cell-free-dna-for-monitoring-player-load-in-professional-football
#12
Nils Haller, Tobias Ehlert, Sebastian Schmidt, David Ochmann, Björn Sterzing, Franz Grus, Perikles Simon
PURPOSE: Player monitoring in elite sports settings is becoming increasingly important. Beside questionnaire based methods, biomarkers, such as circulating, cell-free DNA (cfDNA) are sug-gested for load monitoring. cfDNA concentrations were shown to increase dependent on total distance covered in football and was associated with overtraining in weightlifters. Thus, the objective of this study was to examine whether cfDNA is feasible as a monitoring tool in elite football players. METHODS: We collected capillary blood samples from 22 male elite football players over 4 months of a regular season...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427237/a-12-year-cohort-study-of-doc-stoppage-professional-mixed-martial-arts
#13
Bianca Miarka, Fábio Dal Bello, José Ciro Brito, Fabrício Boscolo Del Vecchio, John Amtmann, Karim Chamari
PURPOSES: This research sought to determine actions during bouts which generate serious enough injury to stop the bout, verifying the injury incidence, types, and prevalence of doctor stoppages (doc-stoppage), and identify potential risk factors by analyzing technical-tactical profiles for injury in sanctioned mixed martial arts (MMA) bouts taking place over a 12-year period. METHODS: The research analyzed 440 paired MMA matches separated by doc-stoppage (n=220) and no doc-stoppage (n=220) from 2002-2014...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427236/individual-factors-affecting-rugby-sevens-match-performance
#14
Mitchell J Henderson, Job Fransen, Jed J McGrath, Simon K Harries, Nick Poulos, Aaron J Coutts
PURPOSE: To examine the collective independent influence of a range of individual characteristics on physical and technical match performance during international rugby sevens matches. METHODS: Data was collected from 20 international rugby sevens players from one team across one season. Activity profiles were measured using wearable microtechnology devices, and technical performance measures were collected from match video analysis. Subjective wellbeing measures were collected using a wellbeing questionnaire completed in the morning of main training days, and groin squeeze assessments at 0° and 60° knee flexion were also conducted using a sphygmomanometer...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427235/caffeine-supplementation-ergogenic-in-both-high-and-low-caffeine-responders
#15
Andreas Apostolidis, Vassilis Mougios, Ilias Smilios, Johanna Rodosthenous, Marios Hadjicharalambous
PURPOSE: Inconsistent results among studies examining the effects of caffeine on exercise performance are potentially due to inter-individual variability in biological responses to caffeine ingestion. The aims, therefore, of the present study were to identify high and low caffeine responders and compare the influence of caffeine on exercise performance and biological responses between groups during a simulated soccer-game protocol on treadmill. METHODS: Well-trained soccer-players were distinguished as high (n = 11) and low (n = 9) caffeine responders based on resting blood pressure, plasma glycerol, non-esterified fatty acid and epinephrine responses to caffeine...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427234/repeated-menthol-spray-application-enhances-exercise-capacity-in-the-heat
#16
Martin J Barwood, Joe Kupusarevic, Stuart Goodall
PURPOSE: Exercise performance is impaired in the heat and a contributing factor to this decrement is thermal discomfort. Menthol-spraying of skin is one means of alleviating thermal discomfort but has yet to be shown to be ergogenic using single spray applications. We examined whether repeated menthol-spraying could relieve thermal discomfort, reduce perception of exertion and improve exercise performance in hot (35ºC), dry (22% RH) conditions; we hypothesised it would. METHOD: Eight trained cyclists completed two separate conditions of fixed intensity (FI) cycling (50% PMax ) for 45-minutes before a test to exhaustion (TTE; 70% PMax ) with 100 mL of menthol-spray (0...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427233/case-study-assessment-of-energy-expenditure-of-a-professional-goalkeeper-from-the-english-premier-league-using-the-doubly-labeled-water-method
#17
Liam Anderson, Graeme L Close, Ryland Morgans, Catherine Hambly, John Roger Speakman, Barry Drust, James P Morton
PURPOSE: To better understand the energy and carbohydrate (CHO) requirements of a professional goalkeeper (GK) in elite soccer, we quantified physical loading, energy expenditure (EE) and energy intake (EI) during a two game per week in-season micro-cycle. METHODS: Daily training and match loads were assessed in a professional GK |(age, 26 years; height, 191 cm; body mass, 86.1 kg) from the English Premier League using global positioning systems (GPS) and ProZone® , respectively...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427232/ingesting-a-bitter-solution-the-sweet-touch-to-increasing-short-term-cycling-performance
#18
Naroa Etxebarria, Megan L Ross, Brad Clark, Louise M Burke
PURPOSE: We investigated the potential benefit of ingesting 2 mM of quinine (bitter tastant) on 3000 m cycling time-trial (TT) performance. METHODS: Nine well-trained male cyclists (maximal aerobic power 386 ± 38 W; mean ± SD) performed a maximal incremental cycling ergometer test, three 3000 m familiarization TT and four 3000 m intervention TT (~4 min) on consecutive days. The four interventions were: 1) 25 ml of Placebo, 2) a 25 ml Sweet solution, and 3) and 4) repeat 25 ml of 2 mM quinine solutions (Bitter1 and Bitter2), 30 seconds prior to each trial...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427230/comparison-of-critical-speed-and-d-derived-from-2-or-3-maximal-tests
#19
Mehdi Kordi, Campbell Menzies, Andy Galbraith
PURPOSE: The hyperbolic distance-time relationship can be used to profile running performance and establish critical speed (CS) and D'. Typically, to establish these parameters multiple (3+) performance trials are required, which can be highly fatiguing and limit the usability of such protocols in a single training session. This study aimed to compare CS and D' calculated from a two-trial (2-point model) and a three-trial (3-point model) method. METHODS: 14 male distance runners completed three fixed-distance (3600, 2400, 1200 m) time trials on a 400 m outdoor running track, separated by a 30-minute recovery...
November 14, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30427229/force-velocity-power-profiling-during-weighted-vest-sprinting-in-soccer
#20
Jorge Carlos-Vivas, Elena Marín-Cascales, Tomás T Freitas, Jorge Perez-Gomez, Pedro E Alcaraz
PURPOSE: To describe the load-velocity relationship and the effects of increasing loads on spatio-temporal and derived kinetics variables of sprinting using weighted vest (WV) in soccer players and determining the load that maximized power output. METHODS: Twenty-three soccer players (age: 20.8±1.5 years) performed ten maximal 30-m sprints wearing a WV, with five different loads (0, 10, 20, 30 and 40% body mass (BM). Sprint velocity and time were collected using a radar device and wireless photocells...
November 14, 2018: International Journal of Sports Physiology and Performance
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