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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
#1
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/28327503/beetroot-juice-supplementation-improves-high-intensity-intermittent-type-exercise-performance-in-trained-soccer-players
#2
Jean Nyakayiru, Kristin L Jonvik, Jorn Trommelen, Philippe J M Pinckaers, Joan M Senden, Luc J C van Loon, Lex B Verdijk
It has been shown that nitrate supplementation can enhance endurance exercise performance. Recent work suggests that nitrate ingestion can also increase intermittent type exercise performance in recreational athletes. We hypothesized that six days of nitrate supplementation can improve high-intensity intermittent type exercise performance in trained soccer players. Thirty-two male soccer players (age: 23 ± 1 years, height: 181 ± 1 m, weight: 77 ± 1 kg, playing experience: 15.2 ± 0.5 years, playing in the first team of a 2nd or 3rd Dutch amateur league club) participated in this randomized, double-blind cross-over study...
March 22, 2017: Nutrients
https://www.readbyqxmd.com/read/28315285/effects-of-plyometric-training-on-physical-fitness-in-prepuberal-soccer-athletes
#3
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/28306393/circannual-rhythm-of-plasmatic-vitamin-d-levels-and-the-association-with-markers-of-psychophysical-stress-in-a-cohort-of-italian-professional-soccer-players
#4
Giovanni Lombardi, Jacopo Antonino Vitale, Sergio Logoluso, Giovanni Logoluso, Nino Cocco, Giulio Cocco, Antonino Cocco, Giuseppe Banfi
Adequate plasmatic Vitamin D levels are crucial to maintain calcium homeostasis and bone metabolism both in the general population and in athletes. Correct dietary supply and a regular sun exposure are fundamental for allowing the desired and effective fitness level. Past studies highlighted a scenario of Vitamin D insufficiency among professional soccer players in several countries, especially in North Europe, whilst a real deficiency in athletes is rare. The typical seasonal fluctuations of Vitamin D are wrongly described transversally in athletes belonging to teams that play at different latitudes and a chronobiologic approach studying the Vitamin D circannual rhythm in soccer players has not been described yet...
March 17, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28301441/predictors-of-linear-and-multidirectional-acceleration-in-elite-soccer-players
#5
Northeast Jonathan, M Russell, D Shearer, C Cook, L Kilduff
Linear and multidirectional acceleration underpins success in professional soccer match-play. However, the physical qualities that determine these performance indicators are poorly understood in elite players. English Premier League players (n=26) performed isometric mid-thigh pulls (IMTP), bilateral and unilateral drop jumps (DJ; from 40 and 20 cm, respectively), bilateral and unilateral countermovement jumps (CMJ) and assessments of linear (5-, 10-, 20-m) and multidirectional (left/right pre-planned and reactive) acceleration...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28298059/groin-problems-in-male-soccer-players-are-more-common-than-previously-reported
#6
Joar Harøy, Ben Clarsen, Kristian Thorborg, Per Hölmich, Roald Bahr, Thor Einar Andersen
BACKGROUND: The majority of surveillance studies in soccer have used a time-;loss injury definition, and many groin problems result from overuse, leading to gradually increasing pain and/or reduced performance without necessarily causing an absence from soccer training or match play. Thus, the magnitude of groin problems in soccer has probably been underestimated in previous studies based on traditional injury surveillance methods. PURPOSE: To investigate the prevalence of groin problems among soccer players of both sexes and among male soccer players at different levels of play through a new surveillance method developed to capture acute and overuse problems...
February 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28290931/prophylactic-ankle-bracing-in-military-settings-a-review-of-the-literature
#7
Thomas M Newman, Michael R Gay, W E Buckley
BACKGROUND: Within athletics and the military, ankle sprains are one of the most common injuries with the potential for long-term functional deficits. Incidence rates for ankle sprains within the military are one of the leading causes of limited duty days, especially during basic combat training, parachute training exercises, and in cadet populations. In 2008, the Department of Defense U.S. Army Center for Health Promotion and Preventative Medicine report recommended that military personnel should wear semirigid ankle braces during parachuting, basketball, soccer, and other similar high-risk activities to reduce ankle sprain injuries...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28277432/physiological-factors-associated-with-declining-repeated-sprint-performance-in-hypoxia
#8
Hannes Gatterer, Verena Menz, Christian Untersteiner, Kultida Klarod, Martin Burtscher
Performance loss in hypoxia might not only be caused by reduced oxygen availability, but might also be influenced by other factors, as for example oxidative stress, perceived exertion or breathing patterns. This study aimed to investigate the influence of these factors on running performance during hypoxic and normoxic shuttle-run sprinting. Eight male amateur soccer players performed shuttle-run sprints in hypoxia (FiO2∼14.8%) and normoxia (random order). Each session comprised 3-sets of 5x10s back and forth sprints (4...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28271801/pediatric-aerobic-fitness-and-trainability
#9
Neil Armstrong
Three papers which between them raise controversial issues, apply laboratory measures to sport performance, and expose gaps in knowledge were selected for commentary. The first paper (Sports Med. 2016;46:1451-1460) reviews the literature on peak V̇O2 in relation to body size and recommends that peak V̇O2 in youth is best expressed via allometric scaling of lean body mass. The second paper (Pediatr Exerc Sci. 2016;28:456-465) reports that maturity status has no effect on peak V̇O2, respiratory compensation point, or ventilatory threshold in youth soccer players once data have been allometrically normalized by lower limb muscle volume...
February 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28254746/what-strategies-can-be-used-to-effectively-reduce-the-risk-of-concussion-in-sport
#10
REVIEW
Carolyn A Emery, Amanda M Black, Ash Kolstad, German Martinez, Alberto Nettel-Aguirre, Lars Engebretsen, Karen Johnston, James Kissick, David Maddocks, Charles Tator, Mark Aubry, Jiří Dvorák, Shinji Nagahiro, Kathryn Schneider
AIM OR OBJECTIVE: To examine the effectiveness of concussion prevention strategies in reducing concussion risk in sport. DESIGN: Systematic review according to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis) guidelines. DATA SOURCES: Eleven electronic databases searched and hand-search of references from selected studies. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: The following were the study inclusion criteria: (1) contained original human research data; (2) investigated an outcome of concussion or head impact; (3) evaluated a concussion prevention intervention; (4) included sport participants; (5) analytical study designand (6) peer-reviewed...
March 2, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28253059/are-injuries-more-common-with-crossfit-training-than-other-forms-of-exercise
#11
Chelsey Klimek, Christopher Ashbeck, Alexander J Brook, Chris Durall
Clinical Scenario: CrossFit is a form of exercise that incorporates rapid and successive high-intensity, ballistic movements. As CrossFit becomes an increasingly popular fitness option, it is important to determine how rates of injury compare to more traditional forms of exercise. This review was conducted to ascertain the incidence of injury with CrossFit relative to other forms of exercise. Focused Clinical Question: Are injuries more common with CrossFit training than other forms of exercise? Summary of Key Findings The literature was searched for studies that compared injury rates among individuals who participated in CrossFit fitness programs to participants in other exercise programs The search initially yielded >100 results which was narrowed down to three level 2b retrospective cohort studies that was deemed to have met inclusion/exclusion criteria In all three reviewed studies, the reported incidences of injuries associated with CrossFit training programs were comparable or lower than rates of injury in Olympic weightlifting, distance running, track and field, rugby, or gymnastics...
March 2, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28253057/sport-specific-outdoor-rehabilitation-in-a-group-setting-do-the-intentions-match-actual-training-load
#12
Jeroen de Bruijn, Henk van der Worp, Mark Korte, Astrid J de Vries, Rick Nijland
CONTEXT: Previous research has shown a weak relationship between intended and actual training load in various sports. Due to variety in group and content, this relationship is expected to be even weaker during group rehabilitation. OBJECTIVE: The goal of our study was to examine the relationship between intended and actual training load during sport-specific rehabilitation in a group setting. DESIGN: Observational study. SETTING: We performed this study during three outdoor rehabilitation sessions...
March 2, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28253042/monitoring-elite-soccer-players-external-loads-using-real-time-data
#13
Steve Barrett
PURPOSE: The principle aim of the study was to assess the validity of measuring locomotor activities and PlayerLoad using Real-Time (RT) data collection during soccer training. METHODS: Twenty-nine (n=29) English soccer players participated. Each player wore the same MEMS device (S5, Optimeye, CatapultSports, Melbourne, Australia) during twenty-one training sessions (n= 331 data sets) in the 2015/2016 and 2016/2017 season. A Real-Time receiver (TRX, Catapultsports, Melbourne, Australia) was used to collect the locomotor activities and PlayerLoad data in RT and compared with the post-event downloaded (PED) data...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253025/long-sprint-abilities-in-soccer-ball-vs-running-drills
#14
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/28250243/changes-in-body-composition-and-bone-of-female-collegiate-soccer-players-through-the-competitive-season-and-off-season
#15
M M Minett, T B Binkley, L A Weidauer, B L Specker
OBJECTIVES: To assess body composition and bone changes pre- to post-season (pre-post) and post- to off-season (post-off) in female soccer athletes (SC). METHODS: Outcomes were assessed using DXA and pQCT in 23 SC and 17 controls at three times throughout season. RESULTS: SC, non-starters in particular, lost lean mass pre-post (-0.9±0.2 kg, p<0.01; not different from controls, p=0.2) and gained fat mass post-off (1.4±0.3 kg, p<0.01; differed from controls, p=0...
March 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28240711/a-self-paced-team-sport-match-simulation-results-in-reductions-in-voluntary-activation-and-modifications-to-biological-perceptual-and-performance-measures-at-half-time-and-for-up-to-96-hours-post-match
#16
Paul Tofari, Justin Kemp, Stuart Cormack
Assessing responses to soccer match-play is limited by match variability or unrealistic simulations. To address this, the biological, perceptual, and performance response were assessed using a self-paced, simulated soccer match protocol using a non-motorized treadmill. Twelve male team-sport athletes performed the 90-min simulation. Match activity; quadriceps twitch interpolation [voluntary activation (%VA) and potentiated twitch (POT)]; biochemical markers; strength and power performance; rating of perceived exertion (RPE) and self-report wellness were collected pre-, half-time, post-, and 2, 24, 48, 72 and 96-h post-match...
February 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28236839/lack-of-eye-discipline-during-headers-in-high-school-girls-soccer-a-possible-mechanism-for-increased-concussion-rates
#17
Joseph F Clark, Hagar T Elgendy-Peerman, Jon G Divine, Robert E Mangine, Kimberly A Hasselfeld, Jane C Khoury, Angelo J Colosimo
The sport of soccer is the fastest growing and most popular sport worldwide. With this growth and popularity, attention needs to be given to this athletic population. Sports related concussions is a topic that has gained attention both in the media and by governmental organizations, with growing initiatives in diagnosis, prevention and treatment. The act of soccer heading is thought to contribute to increased concussion incidence. Current evidence reveals that within the high school soccer athletic population, female athletes incur a higher concussion rate than males...
March 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28229576/hormonal-responses-during-two-different-concurrent-training-trials-in-youth-elite-soccer-players-does-changing-the-organisation-of-training-impact-the-hormonal-response-to-concurrent-exercise
#18
Kevin Enright, James Morton, John Iga, Barry Drust
BACKGROUND: There are no data describing the acute hormonal responses to concurrent- training programmes in youth elite soccer players. Therefore, the aim of this study was to describe the total testosterone (T), cortisol (C), and growth hormone (hGH) responses during two same-day concurrent-training (CT) trials in elite soccer players. METHODS: n=13 youth elite players (age: 17.0±0.2 yrs; height, 1.80±0.07 m; body mass, 73.1±5.7 kg; VO2 max, 64.4±4.8ml-1.kg-1...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229570/the-periodization-of-resistance-training-in-soccer-players-changes-in-maximal-strength-lower-extremity-power-body-composition-and-muscle-volume
#19
Amir Barjaste, Bahman Mirzaei
BACKGROUND: The purpose of this study was to investigate the effect of 12-weeks traditional periodized resistance training on some physical capacities of soccer players. METHODS: Eighteen amateur soccer players with very little experience in resistance training voluntarily participated in this study. Subjects were assigned into two groups; Experimental (EX) group (n: 10) that conducted a traditional linear periodized resistance training program and a control (C) group (n: 8) that did not participate in any resistance training...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229569/nonlinear-sprint-performance-differentiates-professional-from-young-soccer-players
#20
Maithe Cardoso de Araújo, Christian Baumgart, Jürgen Freiwald, Matthias W Hoppe
BACKGROUND: Linear and nonlinear sprinting activities are relevant physical capacities in soccer. This study aimed (1) to compare linear and nonlinear sprint performance between professional and young soccer players and (2) to investigate relationships between both sprint types. METHODS: Sixty-eight German male elite field soccer players were grouped based on age as professional (PRO, n = 20), under-23 (U23, n = 16), under-19 (U19, n = 18), and under-17 (U17, n = 14)...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
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