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https://www.readbyqxmd.com/read/29671383/sport-specific-biomechanical-responses-to-an-acl-injury-prevention-programme-a-randomised-controlled-trial
#1
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament (ACL) injury prevention programmes have not been as successful at reducing injury rates in women's basketball as in soccer. This randomised controlled trial (ClinicalTrials.gov #NCT02530333) compared biomechanical adaptations in basketball and soccer players during jump-landing activities after an ACL injury prevention programme. Eighty-seven athletes were cluster randomised into intervention (6-week programme) and control groups. Three-dimensional biomechanical analyses of drop vertical jump (DVJ), double- (SAG-DL) and single-leg (SAG-SL) sagittal, and double- (FRONT-DL) and single-leg (FRONT-SL) frontal plane jump landing tasks were tested before and after the intervention...
April 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29658521/ratios-of-torques-of-antagonist-muscle-groups-in-female-soccer-players
#2
Artur Struzik, Adam Siemieński, Tadeusz Bober, Bogdan Pietraszewski
PURPOSE: An increase in the value of the hamstring-to-quadriceps (H/Q) ratio with an increase in angular velocity may effectively prevent injuries of the back of the thigh. Previous studies have found that the conventional H/Q ratio was unaltered along with an increasing angular velocity in females. Therefore, this study aimed to investigate the relationships between the conventional H/Q ratio and angular velocity in a group of female soccer players. METHODS: The study was carried out on a group of 16 female soccer players (age: 20...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29628898/postactivation-potentiation-of-the-plantar-flexors-does-not-directly-translate-to-jump-performance-in-female-elite-young-soccer-players
#3
Olaf Prieske, Nicola A Maffiuletti, Urs Granacher
High-intensity muscle actions have the potential to temporarily improve muscle contractile properties (i.e., postactivation potentiation, PAP) thereby inducing acute performance enhancements. There is evidence that balance training can improve performance during strength exercises. Taking these findings together, the purpose of this study was to examine the acute effects of a combined balance and strength (B+S) exercise vs. a strength only (S) exercise on twitch contractile properties, maximum voluntary strength, and jump performance in young athletes...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29623764/-good-better-creative-the-influence-of-creativity-on-goal-scoring-in-elite-soccer
#4
Matthias Kempe, Daniel Memmert
This study investigated the level of creativity of goals scored in football. Therefore, all goals in the Football FIFA World Cup 2010 and 2014, as well as the Football UEFA Euro 2016 were qualitatively examined. Three Football experts evaluated the last eight actions before each goal using a creativity scale ranging from 0 to 10 (0 = not creative, 10 = highly creative) of all goals scored via open play (311 goals in 153 matches). Level of creativity was revealed using an Analysis of Variance and the frquency of high highly creative goals using a Kruskall- Wallis Test...
April 6, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29623049/specific-changes-in-young-soccer-player-s-fitness-after-traditional-bilateral-vs-unilateral-combined-strength-and-plyometric-training
#5
Rodrigo Ramirez-Campillo, Javier Sanchez-Sanchez, Oliver Gonzalo-Skok, Alejandro Rodríguez-Fernandez, Manuel Carretero, Fabio Y Nakamura
The aim of this study was to compare changes in young soccer player's fitness after traditional bilateral vs. unilateral combined plyometric and strength training. Male athletes were randomly divided in two groups; both received the same training, including strength training for knee extensors and flexors, in addition to horizontal plyometric training drills. The only difference between groups was the mode of drills technique: unilateral (UG; n = 9; age, 17.3 ± 1.1 years) vs. bilateral (TG; n = 9; age, 17...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29619795/switching-between-pitch-surfaces-practical-applications-and-future-perspectives-for-soccer-training
#6
Vincenzo Rago, João R Silva, João Brito, Daniel Barreira, Magni Mohr, Peter Krustrup, António N Rebelo
Soccer training and completion is conventionally practiced on natural grass (NG) or artificial turf (AT). Recently, AT pitches for training / competition, and of unstable surfaces for injury prevention training has increased. Therefore, soccer players are frequently exposed to variations in pitch surface during either training or competition. These ground changes may impact physical and physiological responses, adaptations as well as the injury. The aim of this review was to summarize the acute physical and physiological responses, chronic adaptations, and injury risk associated with exercising on different pitch surfaces in soccer...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29618981/influence-of-endurance-training-during-childhood-on-total-hemoglobin-mass
#7
Nicole Prommer, Nadine Wachsmuth, Ina Thieme, Christian Wachsmuth, Erica M Mancera-Soto, Andreas Hohmann, Walter F J Schmidt
Elite endurance athletes are characterized by markedly increased hemoglobin mass (Hbmass). It has been hypothesized that this adaptation may occur as a response to training at a very young age. Therefore, the aim of this study was to monitor changes in Hbmass in children aged 8-14 years following systematic endurance training. In the first study, Hbmass, VO2max, and lean body mass (LBM) were measured in 17 endurance-trained children (13 boys and 4 girls; aged 9.7 ± 1.3 years; training history 1.5±1.8 years; training volume 3...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29611771/the-effects-of-maturation-on-jumping-ability-and-sprint-adaptations-to-plyometric-training-in-youth-soccer-players
#8
Abbas Asadi, Rodrigo Ramirez-Campillo, Hamid Arazi, Eduardo Sáez de Villarreal
The aim of this study was to investigate the effects of maturation on power and sprint performance adaptations following 6 weeks of plyometric training in youth soccer players during pre-season. Sixty male soccer players were categorized into 3 maturity groups (Pre, Mid and Post peak height velocity [PHV]) and then randomly assigned to plyometric group and control group. Vertical jump, standing long jump, and 20-m sprint (with and without ball) tests were collected before- and after-intervention. After the intervention, the Pre, Mid and Post-PHV groups showed significant (P ≤ 0...
April 3, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29602887/proximal-tibiofibular-joint-dislocation-treated-using-flexible-and-permanent-syndesmosis-fixation
#9
Antonio Carlos Moscon, Ana Luiza Cabrera Martimbianco, Aires Duarte Junior, Guilherme Conforto Gracitelli
We present the case of a 40-year-old man who suffered an isolated proximal tibiofibular dislocation of the left knee after a trauma during a soccer game. Physical examination and radiographic imaging revealed an anterolateral dislocation of the proximal fibula. The diagnosis was confirmed by MRI. The treatment choice was open reduction and internal fixation under direct visualisation using flexible and permanent internal fixation. Postoperative treatment includes knee immobilisation during the first week, and partial weight was allowed for 2 weeks progressing to full weight bearing over 4 weeks...
March 30, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29601106/skin-temperature-in-youth-soccer-players-with-functional-equinus-and-non-equinus-condition-after-running
#10
David Rodriguez Sanz, Marta Elena Losa Iglesias, Ricardo Becerro de Bengoa Vallejo, Patricia Palomo Lopez, Hector Beltran Alacreu, Cesar Calvo Lobo, Emmanuel Navarro Flores, Daniel Lopez Lopez
OBJECTIVES: To check how a thermal-IR camera can check skin temperature in Gastrocnemius-soleus Equinus condition and Non-Gastrocnemius-Soleus condition in youth soccer players and thus detect association between the extensibility of the triceps-surae (with Gastrocnemius-Soleus Equinus and Non-Gastrocnemius-Soleus Equinus) and the muscle temperature pattern. DESIGN: A Cross Sectional Study Secundary level of care. METHODS: Sample from an elite soccer academy in Madrid (Spain) 35 healthy male subjects (youth soccer-players) age 12...
March 30, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29599862/fatigue-responses-in-various-muscle-groups-in-well-trained-competitive-male-players-after-a-simulated-soccer-game
#11
Dan Fransson, Jeppe Foged Vigh-Larsen, Ioannis G Fatouros, Peter Krustrup, Magni Mohr
We examined the degree of post-game fatigue and the recovery pattern in various leg and upper-body muscle groups after a simulated soccer game. Well-trained competitive male soccer players (n = 12) participated in the study. The players completed the Copenhagen Soccer Test, a 2 x 45 min simulated soccer protocol, following baseline measures of maximal voluntary contractions of multiple muscle groups and systemic markers of muscle damage and inflammation at 0, 24 and 48 h into recovery. All muscle groups had a strength decrement ( p ≤ 0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599860/can-supplementation-of-vitamin-d-improve-aerobic-capacity-in-well-trained-youth-soccer-players
#12
Maria Jastrzębska, Mariusz Kaczmarczyk, Małgorzata Michalczyk, Łukasz Radzimiński, Piotr Stępień, Joanna Jastrzębska, Dorota Wakuluk, Arturo Díaz Suárez, Guillermo Felipe López Sánchez, Paweł Cięszczyk, Piotr Godlewski, Paweł Król, Zbigniew Jastrzębski
There is no clear evidence that vitamin D effectively improves physical capacity in high-level athletes. The aim of this study was to confirm that vitamin D supplementation of soccer players during eight-week high-intensity training would have a significant effect on their aerobic capacity. The subjects were divided into two groups: the experimental one that was supplemented with vitamin D (SG, n = 20), and the placebo group (PG, n = 16), not supplemented with vitamin D. All the players were subjected to the same soccer training described as High-Intensity Interval Training (HIIT)...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599725/validity-and-reliability-of-10-hz-global-positioning-system-to-assess-in-line-movement-and-change-of-direction
#13
Pantelis T Nikolaidis, Filipe M Clemente, Cornelis M I van der Linden, Thomas Rosemann, Beat Knechtle
The objectives of the present study were to examine the validity and reliability of the 10 Hz Johan GPS unit in assessing in-line movement and change of direction. The validity was tested against the criterion measure of 200 m track-and-field (track-and-field athletes, n = 8) and 20 m shuttle run endurance test (female soccer players, n = 20). Intra-unit and inter-unit reliability was tested by intra-class correlation coefficient (ICC) and coefficient of variation (CV), respectively. An analysis of variance examined differences between the GPS measurement and five laps of 200 m at 15 km/h, and t -test examined differences between the GPS measurement and 20 m shuttle run endurance test...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29594958/change-of-direction-speed-toward-a-strength-training-approach-with-accentuated-eccentric-muscle-actions
#14
Helmi Chaabene, Olaf Prieske, Yassine Negra, Urs Granacher
There is growing evidence that eccentric strength training appears to have benefits over traditional strength training (i.e., strength training with combined concentric and eccentric muscle actions) from muscular, neuromuscular, tendinous, and metabolic perspectives. Eccentric muscle strength is particularly needed to decelerate and stabilize the body during the braking phase of a jump exercise or during rapid changes of direction (CoD) tasks. However, surprisingly little research has been conducted to elucidate the effects of eccentric strength training or strength training with accentuated eccentric muscle actions on CoD speed performance...
March 28, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29585730/musculoskeletal-screening-tests-and-bony-hip-morphology-cannot-identify-male-professional-soccer-players-at-risk-of-groin-injuries-a-2-year-prospective-cohort-study
#15
Andrea B Mosler, Adam Weir, Andreas Serner, Rintje Agricola, Cristiano Eirale, Abdulaziz Farooq, Arnhild Bakken, Kristian Thorborg, Rod J Whiteley, Per Hölmich, Roald Bahr, Kay M Crossley
BACKGROUND: Musculoskeletal hip/groin screening tests are commonly performed to detect at-risk individuals. Bony hip morphology is considered a potential intrinsic risk factor but has not been examined prospectively. PURPOSE: To evaluate the association between intrinsic risk factors identified from musculoskeletal and radiographic screening tests and hip/groin injuries leading to time loss from training and/or match play in professional male soccer players. STUDY DESIGN: Prospective cohort study; Level of evidence, 2...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29584523/brain-behavior-mechanisms-for-the-transfer-of-neuromuscular-training-adaptions-to-simulated-sport-initial-findings-from-the-train-the-brain-project
#16
Dustin R Grooms, Adam W Kiefer, Michael A Riley, Jonathan D Ellis, Staci Thomas, Katie Kitchen, Christopher DiCesare, Scott Bonnette, Brooke Gadd, Kim D Barber Foss, Weihong Yuan, Paula Silva, Ryan Galloway, Jed Diekfuss, James Leach, Kate Berz, Gregory D Myer
CONTEXT: A limiting factor for reducing anterior cruciate ligament (ACL) injury risk is ensuring that the movement adaptions made during the prevention program transfer to sport-specific activity. Virtual reality provides a mechanism to assess transferability and neuroimaging provides a means to assay the neural processes allowing for such skill transfer. OBJECTIVE: To determine the neural mechanisms for injury risk reducing biomechanics transfer to sport after ACL injury prevention training...
March 27, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29584462/effects-of-caffeinated-gum-on-a-battery-of-soccer-specific-tests-in-trained-university-standard-male-soccer-players
#17
Mayur K Ranchordas, George King, Mitchell Russell, Anthony Lynn, Mark Russell
The purpose of this study was to determine whether caffeinated gum influenced performance in a battery of soccer-specific tests used in the assessment of performance in soccer players. In a double blind, randomised, cross-over design, ten male university-standard soccer players (age 19 ± 1 y, stature 1.80 ± 0.10 m, body mass 75.5 ± 4.8 kg) masticated a caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum on two separate occasions. After a standardised warm-up, gum was chewed for 5 min and subsequently expectorated 5 min before players performed a maximal countermovement jump, a 20 m sprint test and the Yo-Yo intermittent recovery test level 1 (Yo-YoIR1)...
March 27, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29570599/increased-leg-bone-mineral-density-and-content-during-the-initial-years-of-college-sport
#18
John J Scerpella, Bjoern Buehring, Scott J Hetzel, Bryan C Heiderscheit
Scerpella, JJ, Buehring, B, Hetzel, SJ, and Heiderscheit, BC. Increased leg bone mineral density and content during the initial years of college sport. J Strength Cond Res 32(4): 1123-1130, 2018-Bone mineral density (BMD) and bone mineral content (BMC) data are useful parameters for evaluating how training practices promote bone health. We used dual-energy X-ray absorptiometry (DXA) to longitudinally assess sport-specific growth in leg and total body BMD/BMC over the initial 2 years of collegiate training. Eighty-five Division 1 collegiate basketball, hockey, and soccer athletes (50 males and 35 females; age 19...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29570578/evaluation-of-seasonal-changes-in-fitness-anthropometrics-and-body-composition-in-collegiate-division-ii-female-soccer-players
#19
Ashley N Peart, Clayton R Nicks, Michael Mangum, Brian M Tyo
The purpose of this study was to investigate anthropometrics, body composition, aerobic and anaerobic fitness of collegiate Division II female soccer players throughout a calendar year. Eighteen (20 ± 0.9y) NCAA division II female soccer players from the same team participated in the study. Anthropometrics and body composition variables were assessed in addition to the Counter Movement Jump (CMJ), Wingate Anaerobic Test (WAT), and peak oxygen uptake (VO2peak). Data were collected over five time points: end of competitive seasons (ECS1 and ECS2), beginning of off-season (BOS), end of off-season (EOS), and pre-season (PS)...
March 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29570574/sequencing-effects-of-plyometric-training-applied-before-or-after-regular-soccer-training-on-measures-of-physical-fitness-in-young-players
#20
Rodrigo Ramirez-Campillo, Cristian Alvarez, Paulo Gentil, Irineu Loturco, Javier Sanchez-Sanchez, Mikel Izquierdo, Jason Moran, Fabio Y Nakamura, Helmi Chaabene, Urs Granacher
To compare the effects of short-term (i.e., 7 week) plyometric training applied before (PJT-B) or after (PJT-A) soccer practice on components of physical fitness in young soccer players, a single-blind randomized controlled trial was conducted. Post-pubertal boys aged 17.0±0.5 years were allocated to three groups: PJT-B (n=12), PJT-A (n=14), and control (CON; n=12). The outcome measures included tests to evaluate 20-m speed, standing long jump [SLJ], squat jump [SJ], countermovement jump [CMJ], and drop jump [DJ], 20-m multistage shuttle running speed [MSSRT], and Illinois change of direction speed [ICODT]...
March 22, 2018: Journal of Strength and Conditioning Research
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