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https://www.readbyqxmd.com/read/28445224/impact-of-6-consecutive-days-of-sprint-training-in-hypoxia-on-performance-in-competitive-sprint-runners
#1
Nobukazu Kasai, Sahiro Mizuno, Sayuri Ishimoto, Etsuko Sakamoto, Misato Maruta, Toshiyuki Kurihara, Yuko Kurosawa, Kazushige Goto
The purpose of the present study was to determine the effects of 6 successive days of repeated sprint training in moderate hypoxia on anaerobic capacity in 100-200-m sprint runners. Eighteen male sprint runners (age, 20.0 ± 0.3 years; height, 175.9 ± 1.1 cm; body mass, 65.0 ± 1.2 kg) performed repeated cycling sprints for 6 consecutive days in either normoxic (NOR; fraction of inspired oxygen [FiO2], 20.9%; n = 9) or hypoxic conditions (HYPO; FiO2, 14.5%; n = 9). The repeated sprint ability (10 × 6-s sprints), 30-s maximal sprint ability, maximal oxygen uptake (VO2max), and 60-m running time on the track were measured before and after the training period...
April 18, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28349727/six-weeks-of-%C3%AE-alanine-supplementation-did-not-enhance-repeated-sprint-ability-or-technical-performances-in-young-elite-basketball-players
#2
Fabio Milioni, Paulo E Redkva, Fabio A Barbieri, Alessandro M Zagatto
Supplementation with β-alanine plays an important role as a precursor of carnosine, the most effective intramuscular buffer, and has been seen as a potential ergogenic aid, especially for high-intensity modalities such as basketball. Thus, the aim of the present study was to investigate the effects of 6 weeks of β-alanine supplementation on repeated sprint ability (RSA) and technical performances in young elite Brazilian basketball players. In total, 27 young basketball players (17±1 years) were randomized into a β-alanine group (Gβ - 6...
January 1, 2017: Nutrition and Health
https://www.readbyqxmd.com/read/28349034/repeated-sprint-ability-is-not-enhanced-by-caffeine-arginine-and-branched-chain-amino-acids-in-moderately-trained-soccer-players
#3
Andrea Ermolao, Tobia Zanotto, Nicolò Carraro, Tommaso Fornasier, Marco Zaccaria, Daniel Neunhaeuserer, Marco Bergamin
The aim was to investigate the effect of a dietary supplementation on the repeated sprint ability (RSA) performance in recreationally trained team sports athletes. Twelve young men underwent a RSA exercise protocol in five trials, in which participants ingested carbohydrates (CHO) plus caffeine (Caf), CHO plus arginine (Arg), CHO plus branched-chain amino acids (BCAA), CHO plus Caf, Arg, and BCAA (ALL), and CHO only. Heart rate, oxygen saturation, hematic lactate, ratings of perceived exertion, average sprint time, total time, best sprint time, peak power, and average power were taken...
February 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28344734/aerobic-capacity-is-related-to-repeated-sprint-ability-with-sprint-distances-less-than-40-meters
#4
Gabriel J Sanders, Zachary Turner, Brian Boos, Corey A Peacock, Willard Peveler, Alar Lipping
Research is inconclusive regarding the association between aerobic fitness (objectively measured VO2max) and repeated sprint performance when the sprints are less than 40 meters. Soccer athletes must be able to repeat sprints without significant decreases in speed and strength and conditioning coaches need to better understand if aerobic fitness is related to repeated sprint ability (RSA). Twenty (10 male, 10 female) Division I soccer athletes first completed a graded maximal treadmill test to measure VO2max...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28344456/caffeine-ingestion-improves-repeated-freestyle-sprints-in-elite-male-swimmers
#5
Paul S R Goods, Grant Landers, Sacha Fulton
The purpose of this investigation was to determine the efficacy of a moderate dose of caffeine to improve repeat-sprint performance in elite freestyle sprinters. Nine highly trained male swimmers performed 6 x 75 m freestyle sprints on two occasions 1-h after consuming either 3 mg·kg(-1) caffeine (CAF), or placebo, in a cross-over manner. Capillary blood samples for the analysis of blood lactate concentration and pH were collected after the 1(st), 3(rd), and 5(th) sprint, while heart rate and perceived exertion (RPE) were collected after every sprint...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28343577/effects-of-pregnancy-on-body-temperature-and-locomotor-performance-of-velvet-geckos
#6
Buddhi Dayananda, Nora Ibargüengoytía, Martin J Whiting, Jonathan K Webb
Pregnancy is a challenging period for egg laying squamates. Carrying eggs can encumber females and decrease their locomotor performance, potentially increasing their risk of predation. Pregnant females can potentially reduce this handicap by selecting higher temperatures to increase their sprint speed and ability to escape from predators, or to speed up embryonic development and reduce the period during which they are burdened with eggs ('selfish mother' hypothesis). Alternatively, females might select more stable body temperatures during pregnancy to enhance offspring fitness ('maternal manipulation hypothesis'), even if the maintenance of such temperatures compromises a female's locomotor performance...
April 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28338355/the-potential-for-a-targeted-strength-training-programme-to-decrease-asymmetry-and-increase-performance-a-proof-of-concept-in-sprinting
#7
Scott R Brown, Erin R Feldman, Matt R Cross, Eric R Helms, Bruno Marrier, Pierre Samozino, Jean-Benoît Morin
The global application of horizontal force (FH) via hip extension is related to improvements in sprint performance (e.g. maximal velocity [vmax] and power [Pmax]). Little is known regarding the contribution of individual-leg FH and how a difference between the legs (asymmetry) might subsequently affect sprint performance. We assessed a single male athlete for pre-post outcomes of a targeted hip extension training programme on FH asymmetry and sprint performance metrics. An instrumented non-motorised treadmill was used to obtain individual-leg and global sprint kinetics and determine the athlete's strong and weak leg, with regards to the ability to produce FH while sprinting...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28332025/endurance-aerobic-high-intensity-and-repeated-sprint-cycling-performance-is-unaffected-by-normobaric-live-high-train-low-a-double-blind-placebo-controlled-cross-over-study
#8
Jacob Bejder, Andreas Breenfeldt Andersen, Rie Buchardt, Tanja Hultengren Larsson, Niels Vidiendal Olsen, Nikolai Baastrup Nordsborg
The aim was to investigate whether 6 weeks of normobaric "Live High-Train Low" (LHTL) using altitude tents affect highly trained athletes incremental peak power, 26-km time-trial cycling performance, 3-min all-out performance, and 30-s repeated sprint ability. In a double-blinded, placebo-controlled cross-over design, seven highly trained triathletes were exposed to 6 weeks of normobaric hypoxia (LHTL) and normoxia (placebo) for 8 h/day. LHTL exposure consisted of 2 weeks at 2500 m, 2 weeks at 3000 m, and 2 weeks at 3500 m...
May 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28328713/the-effect-of-standard-strength-vs-contrast-strength-training-on-the-development-of-sprint-agility-repeated-change-of-direction-and-jump-in-junior-male-soccer-players
#9
Mehréz Hammami, Yassine Negra, Roy J Shephard, Mohamed Souhaiel Chelly
Hammami, M, Negra, Y, Shephard, RJ, and Chelly, MS. The effect of standard strength vs. contrast strength training on the development of sprint, agility, repeated change of direction, and jump in junior male soccer players. J Strength Cond Res 31(4): 901-912, 2017-The aim was to compare the impact of 2 differing strength training (ST) programs on the athletic performance of junior male soccer players at a critical phase during their competitive season. Participants aged 16.0 ± 0.5 years were randomly assigned between control (C, n = 12), standard ST (n = 16), and contrast strength training (CST, n = 16), each performed twice a week...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28315285/effects-of-plyometric-training-on-physical-fitness-in-prepuberal-soccer-athletes
#10
Yassine Negra, Helmi Chaabene, Senda Sammoud, Raja Bouguezzi, Mohamed Aymen Abbes, Younés Hachana, Urs Granacher
This study aimed at examining the effects of plyometric training on stable (SPT) vs. unstable (UPT) surfaces on physical fitness in prepuberal soccer players. Male athletes were randomly assigned to SPT (n=18; age=12.7±0.2 years) or UPT (n=16; age=12.2±0.5 years). Both groups conducted 3 regular soccer training sessions per week combined with either 2 SPT or UPT sessions. Assessment of jumping ability (countermovement jump [CMJ], and standing long jump [SLJ]), speed (10-m, 20-m, 30-m sprint), agility (Illinois agility test [IAT]), and balance (stable [SSBT], unstable [USBT] stork balance test; stable [SYBT], unstable [UYBT] Y balance test) was conducted pre-and post-training...
March 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28269975/effects-of-detraining-on-neuromuscular-performance-in-a-selected-group-of-elite-women-pole-vaulters-a-case-study
#11
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Henrique C Martins, Katia Kitamura, Cesar C Abad, Fabio Y Nakamura
The aim of this paper was to determine the effects of 28 days of inactivity on neuromuscular performance of elite women pole-vaulters. Four athletes undertook measurements of rate of force development (RFD), unloaded and loaded vertical jump tests, drop jumps and a 45 m sprint test before and after a transition period of planned inactivity. The RFD, the ability to accelerate over very short distances (5 m) and sprinting capacity improved after training cessation. Acceleration over longer distances (5-45 m) was impaired, while unloaded and loaded vertical jump tests suffered trivial to small changes...
April 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28253025/long-sprint-abilities-in-soccer-ball-vs-running-drills
#12
Carlo Castagna, Lorenzo Francini, Susana Cristina Araújo Póvoas, Stefano D'Ottavio
PURPOSE: To examine the acute effects of generic (Running Drills, RD) and specific (Small-Sided Games, SSG) Long Sprint Ability (LSA) drills on internal and external load of male soccer-players. METHODS: Fourteen academy-level soccer-players (mean±SD; age 17.6±0.61 years, height 1.81±0.63 m, body-mass 69.53±4.65 kg) performed four 30s LSA bouts for maintenance (work:rest, 1:2) and production (1:5) with RD and SSG drills. Players' external-load was tracked with GPS technology (20Hz) and heart-rate (HR), blood-lactate concentrations (BLc) and rate of perceived exertion (RPE) were used to characterize players' internal-load...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28246078/return-to-play-criteria-after-hamstring-muscle-injury-in-professional-football-a-delphi-consensus-study
#13
Mattia Zambaldi, Ian Beasley, Alison Rushton
BACKGROUND: Hamstring muscle injury (HMI) is the most common injury in professional football and has a high re-injury rate. Despite this, there are no validated criteria to support return to play (RTP) decisions. AIM: To use the Delphi method to reach expert consensus on RTP criteria after HMI in professional football. METHODS: All professional football clubs in England (n=92) were invited to participate in a 3-round Delphi study. Round 1 requested a list of criteria used for RTP decisions after HMI...
February 28, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28225522/effects-of-three-different-resistance-training-frequencies-on-jump-sprint-and-repeated-sprint-ability-performance-in-professional-futsal-players
#14
Adrián Paz-Franco, Ezequiel Rey, Roberto Barcala-Furelos
The aim of this study was to examine the effect of 3 different resistance training frequencies (one strength training session per week (1W), two strength training sessions per week (2W) or one strength training session every second week (0.5W)) on jump, sprint and repeated sprint performance (RSA) in professional futsal players. Thirty-five futsal players were randomized into 1 of 3 groups, the 1W group (n= 12), 2W group (n= 12), or the 0.5W group (n= 11). The players performed the same resistance training during 6 weeks and only training frequency differed between the groups...
February 21, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28223938/hypoxic-repeat-sprint-training-improves-rugby-player-s-repeated-sprint-but-not-endurance-performance
#15
Michael J Hamlin, Peter D Olsen, Helen C Marshall, Catherine A Lizamore, Catherine A Elliot
This study aims to investigate the performance changes in 19 well-trained male rugby players after repeat-sprint training (six sessions of four sets of 5 × 5 s sprints with 25 s and 5 min of active recovery between reps and sets, respectively) in either normobaric hypoxia (HYP; n = 9; FIO2 = 14.5%) or normobaric normoxia (NORM; n = 10; FIO2 = 20.9%). Three weeks after the intervention, 2 additional repeat-sprint training sessions in hypoxia (FIO2 = 14.5%) was investigated in both groups to gauge the efficacy of using "top-up" sessions for previously hypoxic-trained subjects and whether a small hypoxic dose would be beneficial for the previously normoxic-trained group...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28222582/anthropometric-and-performance-measures-to-study-talent-detection-in-youth-volleyball
#16
Giovanni Melchiorri, Valerio Viero, Tamara Triossi, Giuseppe Annino, Elvira Padua, Virginia Tancredi
BACKGROUND: The aim of this work was to study anthropometric and performance measurements in 60 young male volleyball players (YV) and 60 youth not active in the sport (YNA) to assess which of these would be more useful to study the characteristics of potential performers. METHODS: Eight measures to assess anthropometric characteristics, six performance measures and two tests for joint mobility were used. Also relative age and level of maturation were assessed. RESULTS: The anthropometric variables, relative age and level of maturation measured did not show statistically significant differences between groups...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28222579/effects-of-a-small-sided-game-based-training-programme-on-repeated-sprint-and-change-of-direction-abilities-in-recreationally-trained-football-players
#17
Pascual Bujalance-Moreno, Felipe García-Pinillos, Pedro Á Latorre-Román
BACKGROUND: To examine the effects of 6-week periodized small-sided game (SSG) training intervention on change of direction [COD], sprint and repeated sprint ability [RSA] in recreational male football players. METHODS: Twenty-three young football players (age: 20.86 years) were randomized in a control group (n = 11) and an experimental group (n = 12). The SSG programme was included in the experimental group's training sessions. The players completed two variations of a SSG (i...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28222573/soccer-related-performance-in-eumenorrheic-tunisian-high-level-soccer-players-effects-of-menstrual-cycle-phase-and-moment-of-day
#18
Mohamed Tounsi, Hamdi Jaafar, Asma Aloui, Nizar Souissi
BACKGROUND: This study aimed to examine the combined effects of menstrual cycle phase and moment of day on female soccer players' performances in the five-jump test (5JT), the repeated shuttle- sprint ability test (RSSA), and the Yo-Yo intermittent recovery test level 1 (YYIRT1). METHODS: Eleven eumenorrheic Tunisian high-level soccer players volunteered to participate. Each subject individually participated in three testing periods: one in the early follicular phase (menses), one in the late follicular phase, and another in the luteal phase...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28211843/performance-and-metabolic-demand-of-a-new-repeated-sprint-ability-test-in-basketball-players-does-the-number-of-changes-of-direction-matter
#19
Alessandro M Zagatto, Luca P Ardigò, Fabio A Barbieri, Fabio Milioni, Antonio Dello Iacono, Bruno H F Camargo, Johnny Padulo
This study compared two repeated-sprint ability tests in basketball players. Both tests included 10×30-m sprints, with the difference that the previously validated test (RSA2COD) featured two changes of direction (COD) per sprint, while the experimental test (RSA5COD) featured five CODs per sprint. Tests` performances and metabolic demands were specifically assessed in 20 basketball players. Firstly, RSA5COD test-retest reliability was investigated. Then RSA2COD, RSA5COD sprint times, peak speeds, oxygen uptake (VO2) and post-test blood lactate concentration [La] were measured...
November 5, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28199402/short-or-long-rest-intervals-during-repeated-sprint-training-in-soccer
#20
F Marcello Iaia, Matteo Fiorenza, Luca Larghi, Giampietro Alberti, Grégoire P Millet, Olivier Girard
The present study compared the effects of two repeated-sprint training (RST) programs, differing in duration of the between-sprint rest intervals, on various soccer-related exercise performances. For 5 weeks during the competitive season, twenty-nine young trained male soccer players either replaced two of their habitual fitness conditioning sessions with RST characterized by short (5-15; n = 9) or long (5-30; n = 10) rest intervals, or served as control (n = 10). The 5-15 and 5-30 protocols consisted of 6 repetitions of 30-m (~5 s) straight-line sprints interspersed with 15 s or 30 s of passive recovery, respectively...
2017: PloS One
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