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https://www.readbyqxmd.com/read/29239991/a-multiple-repeated-sprint-ability-test-with-four-changes-of-direction-for-badminton-players-part-2-predicting-skill-level-with-anthropometry-strength-shuttlecock-and-displacement-velocity
#1
Michael Phomsoupha, Guillaume Laffaye
The goal of this study was: (i) to assess general and specific lower and upper limb force, shuttlecock velocity, displacement ability and the anthropometric characteristics of badminton players at five skill levels, and (ii) to predict individual players' number of points. We divided 83 participants into groups of novice (n=15), intermediate (n=16), skilled (n=23), highly skilled (n=14) and elite (n=15) players. The number of points scored for each player performing tournaments (excluding novices) during the entire season was used as a continuous and dependent variable after logarithmic transformation for correlational study...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29238253/plyometric-training-improves-sprinting-jumping-and-throwing-capacities-of-high-level-female-volleyball-players-better-than-skill-based-conditioning
#2
Bahri Gjinovci, Kemal Idrizovic, Ognjen Uljevic, Damir Sekulic
There is an evident lack of studies on the effectiveness of plyometric- and skill-based-conditioning in volleyball. This study aimed to evaluate effects of 12-week plyometric- and volleyball-skill-based training on specific conditioning abilities in female volleyball players. The sample included 41 high-level female volleyball players (21.8 ± 2.1 years of age; 1.76 ± 0.06 cm; 60.8 ± 7.0 kg), who participated in plyometric- (n = 21), or skill-based-conditioning-program (n = 20). Both programs were performed twice per week...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29234284/the-efficacy-of-wrestling-style-compression-suits-to-improve-maximum-isometric-force-and-movement-velocity-in-well-trained-male-rugby-athletes
#3
Daniel T McMaster, Christopher M Beaven, Brad Mayo, Nicholas Gill, Kim Hébert-Losier
Purpose: The prevalence of compression garment (CG) use is increasing with athletes striving to take advantage of the purported benefits to recovery and performance. Here, we investigated the effect of CG on muscle force and movement velocity performance in athletes. Methods: Ten well-trained male rugby athletes wore a wrestling-style CG suit applying 13-31 mmHg of compressive pressure during a training circuit in a repeated-measures crossover design. Force and velocity data were collected during a 5-s isometric mid-thigh pull (IMTP) and repeated countermovement jump (CMJ), respectively; and time to complete a 5-m horizontal loaded sled push was also measured...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29210957/the-physiological-and-performance-effects-of-caffeine-gum-consumed-during-a-simulated-half-time-by-professional-academy-rugby-union-players
#4
Russell M, Reynolds N A, Crewther B T, Cook C J, Kilduff L
Despite the prevalence of caffeine as an ergogenic aid, few studies have examined the use of caffeinated gums, especially during half-time in team sports. The physiological (blood lactate, salivary hormone concentrations) and performance (repeated sprints, cognitive function) effects of consuming caffeine gum during a simulated half-time were examined. Professional academy rugby union players (n=14) completed this double-blind, randomized, counterbalanced study. Following pre-exercise measurements , players chewed a placebo (PL) gum for five min before a standardized warm-up and completing repeated sprint testing (RSSA1)...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29210955/comparison-between-power-off-ice-test-and-performance-on-ice-anaerobic-testing
#5
Vincent Gosselin Boucher, Andrée-Anne Parent, Fanie St-Jean Miron, Mario Leone, Alain Steve Comtois
The importance of specific testing has been shown in ice hockey performance and the understanding and connection between them may lead to adapting training and follow up in elite athletes. The aim of the present study was to compare two off-ice power tests with performances on ice with a complete professional hockey team. The broad jump test and the vertical jump test were used for the off-ice evaluations, while the SAS-40 and the repeated skate sprint modify (RSSm) tests were used as the performance variables...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29194185/does-maturity-status-affect-the-relationship-between-anaerobic-speed-reserve-and-multiple-sprints-sets-performance-in-young-soccer-players
#6
Mohamed Amin Selmi, Badriya Al-Haddabi, Mohamed Haj Yahmed, Radhouane Haj Sassi
The purpose of this study is to examine the relationship between repeated-sprint sets (RSS) performance indices and anaerobic speed reserve (ASR) in young soccer players of different maturity status. One hundred and seventy nine young male soccer players (11.1 to 17.8 years) classified as pre- (n=50), circum- (n=60), or post- (n=69) peak height velocity (PHV) performed multi-stage shuttle run test (MRST) to measure maximal aerobic speed (MAS), 30-m sprint with 10-m splits to estimate maximal anaerobic speed (MAnS), and RSS test...
November 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29192837/effects-of-the-nordic-hamstring-exercise-on-sprint-capacity-in-male-football-players-a-randomized-controlled-trial
#7
Lasse Ishøi, Per Hölmich, Per Aagaard, Kristian Thorborg, Thomas Bandholm, Andreas Serner
This assessor-blinded, randomized controlled superiority trial investigated the efficacy of the 10-week Nordic Hamstring exercise (NHE) protocol on sprint performance in football players. Thirty-five amateur male players (age: 17-26 years) were randomized to a do-as-usual control group (CG; n = 17) or to 10-weeks of supervised strength training using the NHE in-season (IG; n = 18). A repeated-sprint test, consisting of 4 × 6 10 m sprints, with 15 s recovery period between sprints and 180 s between sets, was conducted to evaluate total sprint time as the primary outcome...
December 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29189585/muscle-damage-and-metabolic-responses-to-repeated-sprint-running-with-and-without-deceleration
#8
Clare L Minahan, Daniel P Poke, Jaime Morrison, Phillip M Bellinger
This study aimed to determine whether repeated-sprint running with deceleration aggravates markers of muscle damage or delays the recovery of performance compared to repeated-sprint running without deceleration. Fourteen male team-sport athletes performed two randomly ordered testing sessions on a non-motorised treadmill with one session requiring participants to decelerate (TMd) within 4 s before stopping, or immediately step to the side of the treadmill belt at the completion of each sprint (TMa). Peak and mean velocities, speed decrement, blood lactate concentrations and oxygen uptake were monitored during the repeated-sprint running protocols...
November 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29182413/energetic-profile-of-the-basketball-exercise-simulation-test-in-junior-elite-players
#9
Richard Latzel, Olaf Hoos, Sebastian Stier, Sebastian Kaufmann, Volker Fresz, Dominik Reim, Ralph Beneke
PURPOSE: To analyze the energetic profile of the basketball exercise simulation test (BEST). METHODS: 10 male elite junior basketball players (age: 15.5±0.6yrs, height: 180±9cm, body mass: 66.1±11.2kg) performed a modified BEST (20 circuits consisting of jumping, sprinting, jogging, shuffling, and short breaks) simulating professional basketball game play. Circuit time, sprint time, sprint decrement, oxygen uptake (VO2), heart rate (HR), and blood lactate concentration (BLC) were obtained...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29163193/changes-in-muscle-and-cerebral-deoxygenation-and-perfusion-during-repeated-sprints-in-hypoxia-to-exhaustion
#10
Sarah J Willis, Laurent Alvarez, Grégoire P Millet, Fabio Borrani
During supramaximal exercise, exacerbated at exhaustion and in hypoxia, the circulatory system is challenged to facilitate oxygen delivery to working tissues through cerebral autoregulation which influences fatigue development and muscle performance. The aim of the study was to evaluate the effects of different levels of normobaric hypoxia on the changes in peripheral and cerebral oxygenation and performance during repeated sprints to exhaustion. Eleven recreationally active participants (six men and five women; 26...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29161984/the-prognostic-value-of-physiological-and-physical-characteristics-in-youth-soccer-a-systematic-review
#11
Dennis Murr, Johannes Raabe, Oliver Höner
Talent identification and selection in soccer is typically based on subjective evaluations of experienced coaches. Recently, there has been a trend to complement these subjective assessments with objective tests. However, there is currently no comprehensive overview of the prognostic relevance of objective measurements in youth soccer. Therefore, the primary purpose of the current study was to systematically review published empirical studies related to the prognostic relevance of physiological (e.g. endurance and speed) and physical characteristics (i...
November 21, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29158613/blood-pressure-heart-rate-and-perceived-enjoyment-after-small-sided-soccer-games-and-repeated-sprint-in-untrained-healthy-adolescents
#12
Amri Hammami, Sofien Kasmi, Paulo Farinatti, Taieb Fgiri, Karim Chamari, Ezdine Bouhlel
The purpose of this study was to examine systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), rating of perceived exertion (RPE) and perceived enjoyment responses to a repeated-sprint training session (RST) compared to a small-sided soccer game session (SSG) in untrained adolescents. Twelve healthy post-pubertal adolescent males (age 15.8±0.6 years, body mass 59.1±3.7 kg, height 1.7±0.1m) performed RST and SSG sessions in a randomized and counterbalanced order. Blood pressure and HR were measured at rest and at 10, 20 and 30 minutes after interventions, and RPE and enjoyment were assessed...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29140147/sprint-running-performance-and-technique-changes-in-athletes-during-periodized-training-an-elite-training-group-case-study
#13
Ian N Bezodis, David G Kerwin, Stephen-Mark Cooper, Aki I T Salo
PURPOSE: To understand how training periodization influences sprint performance and key step characteristics over an extended training period in an elite sprint training group. METHODS: Four sprinters were studied during five months of training. Step velocities, step lengths and step frequencies were measured from video of the maximum velocity phase of training sprints. Bootstrapped mean values were calculated for each athlete for each session and 139 within-athlete, between-session comparisons were made with a repeated measures ANOVA...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29120695/hypoxia-and-sprint-swimming-performance-of-juvenile-striped-bass-morone-saxatilis
#14
Krista Kraskura, Jay A Nelson
Annual hypoxia in the Chesapeake Bay has expanded to the point where Darwinian fitness of juvenile striped bass (Morone saxatilis) may depend on their ability to perform in low-oxygen environments. The locomotion they use in predator/prey dynamics relies primarily on white (type II) muscle that is powered by anaerobic metabolic pathways and has generally been thought to be immune to aquatic hypoxia. We tested the sprint performance of 15 juvenile striped bass twice under acute hypoxia (20% air saturation [AS]) 5 wk apart and once under normoxia (>85% AS) in between...
January 2018: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29117428/change-in-knee-flexor-torque-after-fatiguing-exercise-identifies-previous-hamstring-injury-in-football-players
#15
Cameron Lord, Fadi Ma'ayah, Anthony J Blazevich
PURPOSE: Muscular fatigue and inter-limb strength asymmetry are factors known to influence hamstring injury risk, however limb-specific exacerbation of knee flexor (hamstrings) torque production after fatiguing exercise has previously been ignored. To investigate changes in muscular force production before and after sport-specific (repeated-sprint) and non-specific (knee extension-flexion) fatiguing exercise, and explore the sensitivity and specificity of isokinetic endurance (i.e. muscle-specific) and single-leg vertical jump (i...
November 8, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29106812/whey-protein-hydrolysate-supplementation-accelerates-recovery-from-exercise-induced-muscle-damage-in-females
#16
Meghan A Brown, Emma J Stevenson, Glyn Howatson
A number of different forms of protein and their analogues have been investigated for their efficacy in ameliorating exercise-induced muscle damage (EIMD) and recovery. Preliminary data regarding whey protein hydrolysate (WPH) supplementation are promising. However, its efficacy beyond acute eccentric/resistance exercise bouts or longer-term training programmes are limited and all investigations have been conducted in male or mixed-sex groups. This study sought to elucidate whether the benefits of WPH previously reported can be demonstrated in females following repeated-sprint exercise...
November 6, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29091470/acute-ingestion-of-caffeinated-chewing-gum-improves-repeated-sprint-performance-of-team-sports-athletes-with-low-habitual-caffeine-consumption
#17
Mark Evans, Peter Tierney, Nicola Gray, Greg Hawe, Maria Macken, Brendan Egan
The effects of acute ingestion of caffeine on short-duration high intensity performance are equivocal, while studies of novel modes of delivery and the efficacy of low doses of caffeine are warranted. The aims of the present study were to investigate the effect of acute ingestion of caffeinated chewing gum on repeated sprint performance (RSP) in team sport athletes, and whether habitual caffeine consumption alters the ergogenic effect, if any, on RSP. Eighteen male team sports athletes undertook four RSP trials using a 40 m maximum shuttle run test (MST), which incorporates 10x40 m sprints with 30 s between the start of each sprint...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29084097/differential-effects-of-different-warm-up-protocols-on-repeated-sprints-induced-muscle-damage
#18
Che-Hsiu Chen, Xin Ye, Yi-Tse Wang, Yung-Sheng Chen, Wei-Chin Tseng
The purpose of this investigation was to examine whether adding a set of hamstring resistance exercise or dynamic stretching to a regular running-based warm-up before a bout of repeated sprints provides protective effects against the sprinting-induced muscle damage. Twelve elite tennis players participated in this study. After the familiarization, subjects completed 3 separate randomly sequenced experimental visits, during which 3 different warm-up interventions were performed before the muscle-damaging protocol (12 sets of 30-m maximal repeated sprints): 5 minutes of running (control); control with single leg slide curl (SLC); and control with active hamstring stretching (AHS)...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29084095/a-multiple-repeated-sprint-ability-test-for-badminton-players-involving-four-changes-of-direction-validity-and-reliability-part-1
#19
Michael Phomsoupha, Quentin Berger, Guillaume Laffaye
The purpose of the present study was: i) to develop a new sport-specific, repeated sprint ability test involving four changes of direction, namely, the multiple repeated sprint ability (MRSAB) test for badminton players; ii) to determine its validity by comparing the results of five different skill levels; and iii) to assess the link between the new test and neuromuscular lower limb and physiological variables. For this purpose, 42 participants were separated into five groups in order to perform the MRSAB test at the same time of day, on two occasions, separated by at least 48 hours...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29083126/exercise-to-rest-ratios-in-rsa-training-in-women-s-soccer
#20
Bruno Ruscello, Mario Esposito, Filippo Partipilo, Dalila DI Cicco, Cristoforo Filetti, Laura Pantanella, Stefano D'Ottavio
BACKGROUND: To investigate the applicability of three different exercise to rest ratios in RSA training in women's soccer players, applying those ones already adopted in male adult and young players, when performing three different sprinting modes (straight, shuttle and sprinting with changing of direction). METHODS: 15 trained female soccer players (height: 1.65 ± 0.06 m; weight: 59.3 ± 9.0 kg; BMI 21.6 ± 2.7 kg·m-2; age: 23.3±5.9 years) participated to the study...
October 27, 2017: Journal of Sports Medicine and Physical Fitness
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