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https://www.readbyqxmd.com/read/29431546/the-trainability-of-adolescent-soccer-players-to-brief-periodized-complex-training
#1
Athanasios Chatzinikolaou, Konstantinos Michaloglou, Alexandra Avloniti, Diamanda Leontsini, Chariklia K Deli, Dimitris Vlachopoulos, Luis Gracia-Marco, Sotirios Arsenis, Ioannis Athanailidis, Dimitrios Draganidis, Athanasios Z Jamurtas, Craig A Williams, Ioannis G Fatouros
PURPOSE: Τo investigate the effect of a complex, short-term strength/power training protocol on performance and body composition of elite early-adolescent soccer players. METHODS: Twenty-two players (14-15 years) were randomly assigned to (a) an experimental (EG, n=12, participated in a 5-week training protocol with traditional multi-joint power resistance exercises, Olympic-style lifts, plyometric drills and speed work, four times/week) or (b) a control group (CG, n=10)...
February 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29420150/adaptations-in-muscle-oxidative-capacity-fiber-size-and-oxygen-supply-capacity-after-repeated-sprint-training-in-hypoxia-combined-with-chronic-hypoxic-exposure
#2
Stephan van der Zwaard, Franck Brocherie, Bengt L G Kom, Grégoire P Millet, Louise Deldicque, Willem J van der Laarse, Olivier Girard, Richard T Jaspers
In this study, we investigate adaptations in muscle oxidative capacity, fiber size and oxygen supply capacity in team-sport athletes after six repeated-sprint sessions in normobaric hypoxia or normoxia combined with 14 days of chronic normobaric hypoxic exposure. Lowland elite field hockey players resided at simulated altitude ({greater than or equal to}14 h∙d-1 at 2800-3000 m) and performed regular training plus six repeated-sprint sessions in normobaric hypoxia (3000 m; LHTLH; n=6) or normoxia (0 m, LHTL; n=6) or lived at sea level with regular training only (LLTL; n=6)...
February 8, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29412076/repeated-sprint-performance-and-plasma-responses-following-beetroot-juice-supplementation-do-not-differ-between-recreational-competitive-and-elite-sprint-athletes
#3
K L Jonvik, J Nyakayiru, J W van Dijk, K Maase, S B Ballak, J M G Senden, L J C van Loon, L B Verdijk
PURPOSE: There is an ongoing debate whether highly trained athletes are less responsive to the ergogenic properties of nitrate. We assessed the effects of nitrate supplementation on plasma nitrate and nitrite concentrations and repeated-sprint performance in recreational, competitive and elite sprint athletes. METHODS: In a randomized double-blinded cross-over design, recreational cyclists (n = 20), national talent speed-skaters (n = 22) and Olympic-level track cyclists (n = 10) underwent two 6-day supplementation periods; 140 mL/d nitrate-rich (BR; ∼800 mg/d) and nitrate-depleted (PLA; ∼0...
February 7, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29408911/effect-of-repeated-sprints-on-the-reliability-of-short-term-parasympathetic-reactivation
#4
Matteo Bonato, Andrea Meloni, Giampiero Merati, Antonio La Torre, Luca Agnello, Gianluca Vernillo
This study determined the reliability of post-exercise heart rate recovery (HRR) and vagal-related HR variability (HRV) after repeated-sprints (RSs), and contrasted it with the smallest worthwhile change (SWC) of these indices. Fourteen healthy male participants performed on four occasions, separated by 7 days, five 30-m sprints interspersed by 25-s of recovery. Post-exercise HR during 10 min of seated rest was measured. HRR during the first 60-s of recovery was computed (HRR60s). HRV indices were calculated in time and frequency domains during the last 5-min of the recovery...
2018: PloS One
https://www.readbyqxmd.com/read/29400616/repeated-sprint-training-in-hypoxia-induced-by-voluntary-hypoventilation-improves-running-repeated-sprint-ability-in-rugby-players
#5
Charly Fornasier-Santos, Grégoire P Millet, Xavier Woorons
PURPOSE: The goal of this study was to determine the effects of repeated-sprint training in hypoxia induced by voluntary hypoventilation at low lung volume (VHL) on running repeated-sprint ability (RSA) in team-sport players. METHODS: Twenty-one highly trained rugby players performed, over a 4-week period, seven sessions of repeated 40-m sprints either with VHL (RSH-VHL, n = 11) or with normal breathing (RSN, n = 10). Before (Pre-) and after training (Post-), performance was assessed with an RSA test (40-m all-out sprints with a departure every 30 s) until task failure (85% of the reference velocity assessed in an isolated sprint)...
February 5, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29389467/the-effect-of-massage-on-acceleration-and-sprint-performance-in-track-field-athletes
#6
Ryan N Moran, John M Hauth, Robert Rabena
PURPOSE: To examine the acute effects of pre-competition massage on acceleration and sprint performance in collegiate track and field athletes. METHODS: Seventeen collegiate male (n = 9) and female (N = 8) track and field athletes participated in the study. Athletes were assigned to a counterbalanced, repeated measures designed experiment testing four treatment conditions of a pre-competition massage, dynamic warm-up, combination of a massage and warm-up, and a placebo ultrasound...
February 2018: Complementary Therapies in Clinical Practice
https://www.readbyqxmd.com/read/29385007/alcohol-after-resistance-exercise-does-not-affect-muscle-power-recovery
#7
Danielle E Levitt, Nosakhare O Idemudia, Carianne M Cregar, Anthony A Duplanty, David W Hill, Jakob L Vingren
The purpose of this study was to investigate the effect of alcohol consumed after heavy eccentric resistance exercise on measures of muscle power. After familiarization and an initial eccentric exercise bout to control for the "repeated-bout effect," ten recreationally resistance-trained men completed two identical heavy eccentric squat bouts (4 sets of 10 repetitions at 110% of concentric 1-repetition maximum) one week apart. Each exercise bout was followed by ingestion of a beverage containing either alcohol (1...
January 29, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29374581/self-confidence-and-affect-responses-to-short-term-sprint-interval-training
#8
Walid Selmi, Haithem Rebai, Mokhtar Chtara, Abdelmajid Naceur, Sonia Sahli
The study aimed to investigate the effects of repeated sprint (RS) training on somatic anxiety (SA), cognitive anxiety (CA), self-confidence (SC), rating of perceived exertion (RPE) and repeated sprint ability (RSA) indicators in elite young soccer players. Thirty elite soccer players in the first football league (age: 17.8±0.9years) volunteered to participate in this study. They were randomly assigned to one of two groups: a repeated sprint training group (RST-G; n=15) and a control group (CON-G; n=15). RST-G participated in 6weeks of intensive training based on RS (6×(20+20m) runs, with 20s passive recovery interval between sprints, 3 times/week)...
January 25, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29373205/a-20%C3%A3-20m-repeated-sprint-field-test-replicates-the-demands-of-wheelchair-rugby
#9
Cameron M Gee, Melissa A Lacroix, Christopher R West
OBJECTIVES: To assess the physiological responses to, and the agreement between, a 20×20m repeated sprint field test and wheelchair rugby game play, as well as the reliability of the test. DESIGN: Cross-sectional and longitudinal. METHODS: Heart rate (HR), blood lactate ([La-]B), and ratings of perceived exertion (RPE) were collected in nineteen elite wheelchair rugby athletes before, during, and after a 20×20m repeated sprint field test and game play...
December 16, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29370268/circulating-cell-free-dna-as-a-marker-for-exercise-load-in-intermittent-sports
#10
Nils Haller, Susanne Helmig, Pascal Taenny, Julian Petry, Sebastian Schmidt, Perikles Simon
BACKGROUND: Attempts to establish a biomarker reflecting individual player load in intermittent sports such as football have failed so far. Increases in circulating DNA (cfDNA) have been demonstrated in various endurance sports settings. While it has been proposed that cfDNA could be a suitable marker for player load in intermittent sports, the effects on cfDNA of repeated sprinting as an essential feature in intermittent sports are unknown. For the first time, we assessed both alterations of cfDNA due to repeated maximal sprints and due to a professional football game...
2018: PloS One
https://www.readbyqxmd.com/read/29368182/administration-of-caffeine-in-alternate-forms
#11
REVIEW
Kate A Wickham, Lawrence L Spriet
There has been recent interest in the ergogenic effects of caffeine delivered in low doses (~ 200 mg or ~ 3 mg/kg body mass) and administered in forms other than capsules, coffee and sports drinks, including chewing gum, bars, gels, mouth rinses, energy drinks and aerosols. Caffeinated chewing gum is absorbed quicker through the buccal mucosa compared with capsule delivery and absorption in the gut, although total caffeine absorption over time is not different. Rapid absorption may be important in many sporting situations...
January 24, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29366354/dietary-habits-and-energy-balance-in-an-under-21-male-international-soccer-team
#12
Dorianne Bonnicci, Ibrahim Akubat, Matthew Greig, Andy Sparks, Lars R Mc Naughton
Soccer presents a metabolic challenge which is not necessarily matched by players' habitual dietary intake. To examine the effects of a bespoke diet, 22 players completed the Ball Sport Endurance and Sprint Test (BEAST90mod) protocol, followed by 4 days of regulated nutritional intake. The diet consisted of 10 g∙kg-1 body mass (BM) and 1.7 g∙kg-1 BM of carbohydrate and protein, respectively. On day 5, players followed a prematch nutritional strategy of 7 g∙kg-1 BM of carbohydrate and 1 g∙kg-1 BM of protein divided into three meals and then repeated the BEAST90mod...
January 25, 2018: Research in Sports Medicine
https://www.readbyqxmd.com/read/29365286/effect-of-cluster-set-warm-up-configurations-on-sprint-performance-in-collegiate-male-soccer-players
#13
Brett S Nickerson, Gerald T Mangine, Tyler D Williams, Ismael A Martinez
The purpose of this study was to determine if back squat cluster sets (CS) with varying inter-repetition rest periods would potentiate greater sprint performance compared to a traditional set parallel back squat in collegiate soccer players. Twelve collegiate male soccer players (21.0 ± 2.0 years; 180.0 ± 9.0 cm; 79.0 ± 9.5 kg) performed a 20-meter sprint prior to (PRE) a potentiation complex and at 1-, 4-, 7-, and 10-minutes post-exercise on three separate, randomized occasions. On each occasion, the potentiation complex consisted of 1 set of 3 repetitions at 85% one-repetition maximum (1RM) for the traditional parallel back squat...
January 24, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29345532/ischemic-pre-conditioning-does-not-influence-maximal-sprint-acceleration-performance
#14
Kyle M A Thompson, Alanna K Whinton, Shane Ferth, Lawrence L Spriet, Jamie F Burr
Ischemic pre-conditioning (IPC) was initially developed to protect the myocardium from ischemia through altered cardiocyte metabolism. Due to the observed effects on metabolism and oxygen kinetics, IPC gained interest as a potential ergogenic aid in sport. Limited research evaluating the effects of IPC on maximal short-duration activities has been performed and of the existing literature, mixed outcomes resulting from intra-subject variation may have clouded the efficacy of this technique for enhancing sprint performance...
January 18, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29345173/effects-of-3-day-serial-sodium-bicarbonate-loading-on-performance-and-physiological-parameters-during-a-simulated-basketball-test-in-female-university-players
#15
Anne Delextrat, Sinead MacKessy, Luis Arceo-Rendon, Aaron Scanlan, Roger Ramsbottom, Julio Calleja-González
The aim of this study was to investigate the effect of 3-day serial sodium bicarbonate ingestion on repeated sprint and jump performance. Fifteen female university basketball players (23.3±3.4 years; 173.1±5.8 cm; 65.8±6.3 kg; 23.6±4.9% body fat) ingested 0.4 g·kg-1 of body mass of sodium bicarbonate or placebo for 3 days (split in 3 equal daily doses), before completing a simulated basketball exercise. Sprint and circuit times, jump heights, performance decrements and gastrointestinal (GI) side effects were recorded during the test and blood lactate concentration was measured pre- and post-test...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29339993/functional-and-muscle-size-effects-of-flywheel-resistance-training-with-eccentric-overload-in-professional-handball-players
#16
Sergio Maroto-Izquierdo, David García-López, José A de Paz
The aim of the study was to analyse the effects of 6 week (15 sessions) flywheel resistance training with eccentric-overload (FRTEO) on different functional and anatomical variables in professional handball players. Twenty-nine athletes were recruited and randomly divided into two groups. The experimental group (EXP, n = 15) carried out 15 sessions of FRTEO in the leg-press exercise, with 4 sets of 7 repetitions at a maximum-concentric effort. The control group (CON, n = 14) performed the same number of training sessions including 4 sets of 7 maximum repetitions (7RM) using a weight-stack leg-press machine...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339990/high-intensity-small-sided-games-versus-repeated-sprint-training-in-junior-soccer-players
#17
Niyazi Eniseler, Çağatay Şahan, Ilker Özcan, Kıvanç Dinler
The aim of this study was to compare the effects of high-intensity small-sided games training (SSGT) versus repeated-sprint training (RST) on repeated-sprint ability (RSA), soccer specific endurance performance and short passing ability among junior soccer players. The junior soccer players were recruited from of a professional team (age 16.9 ± 1.1 years). The tests included the repeated-shuttle-sprint ability test (RSSAT), Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1) and Loughborough Soccer Passing Test (LSPT)...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29337832/comparison-of-step-by-step-kinematics-in-repeated-30m-sprints-in-female-soccer-players
#18
Roland van den Tillaar
The aim of this study was to compare kinematics in repeated 30m sprints in female soccer players. Seventeen subjects performed seven 30m sprints every 30s in one session. Kinematics were measured with an infrared contact mat and laser gun, and running times with an electronic timing device. The main findings were that sprint times increased in the repeated sprint ability test. The main changes in kinematics during the repeated sprint ability test were increased contact time and decreased step frequency, while no change in step length was observed...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337831/the-acute-effects-of-a-caffeine-containing-supplement-on-anaerobic-power-and-subjective-measurements-of-fatigue-in-recreationally-active-males
#19
Chelsea J Hahn, Andrew R Jagim, Clayton L Camic, Matthew J Andre
Studies show mixed results for the effects of caffeine on performance, warranting further investigation. The purpose of this study was to examine the acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue during resisted sprinting on males. Fourteen recreationally-active males [N=14; (mean±SD), age: 21.0±0.7 yrs., height: 178.5±5.1 cm, weight: 77.3±9.6 kg, percent body fat: 12.6±4.8%] participated in a double-blind, placebo controlled, within-subjects crossover design study...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324580/the-relationship-between-skating-economy-and-performance-during-a-repeated-shift-test-in-elite-and-sub-elite-ice-hockey-players
#20
Nicholas R Lamoureux, Grant R Tomkinson, Benjamin J Peterson, John S Fitzgerald
The purpose of this study was to determine the importance of skating economy to fatigue during repeated high-intensity efforts of a simulated ice hockey shift. Forty-five collegiate and Junior A male ice hockey players (aged 18-24 years) performed a continuous graded exercise test using a skate treadmill. Breath-by-breath data for oxygen consumption (V[Combining Dot Above]O2) and respiratory exchange ratio were collected and used to derive energy expenditure (EE) averaged over the final 10 seconds of each stage...
January 5, 2018: Journal of Strength and Conditioning Research
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