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https://www.readbyqxmd.com/read/29150270/m-biceps-femoris-a-wolf-in-sheep-s-clothing-the-downside-of-a-lower-limb-injury-prevention-training
#1
Thomas Ertelt, Thomas Gronwald
Both, hamstring and ACL injuries are among the most typical injuries, particularly in change of direction and high speed running sports. They're also difficult to treat. Therefore, in the past few years, sports medicine practitioners and exercise scientists have mainly been focusing on the development and implementation of preventive programs in order to reduce the number of lower limb injuries, mainly by improving knee alignment. A number of studies have been able to prove the success of these training interventions, which are mainly addressing sensorimotor abilities and plyometric activities...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29140909/the-effects-of-load-on-peak-power-output-fatigue-during-the-bench-throw
#2
David Boffey, Bulent Sokmen, Kurt Sollanek, Wanda Boda, Steven Winter
The ability to create power is an important variable for athletic success. No study to date has compared peak power output (PPO) fatigue across multiple sets and with different loads with the bench throw. This study aimed to begin the process of establishing empirical upper body power training guidelines for moderately strong athletes by determining how load (30%, 45%, 60% 1RM) affects PPO (Watts) dropoff during 3 sets of 10 repetitions of the bench throw. 10 resistance-trained male volunteers ((mean ± SD): age 20...
November 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29121680/effects-of-drop-height-and-surface-instability-on-jump-performance-and-knee-kinematics
#3
Melanie Lesinski, Olaf Prieske, Rainer Beurskens, David Behm, Urs Granacher
The purpose of this study was to examine the combined effects of drop-height and surface condition on drop jump (DJ) performance and knee joint kinematics. DJ performance, sagittal and frontal plane knee joint kinematics were measured in jump experienced young male and female adults during DJs on stable, unstable and highly unstable surfaces using different drop-heights (20, 40, 60 cm). Findings revealed impaired DJ performance (Δ5-16%; p<0.05; 1.43≤d≤2.82), reduced knee valgus motion (Δ33-52%; p<0...
November 9, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29112054/lower-extremity-stiffness-considerations-for-testing-performance-enhancement-and-injury-risk
#4
Jon Brazier, Sean Maloney, Chris Bishop, Paul J Read, Anthony N Turner
Brazier, J, Maloney, S, Bishop, C, Read, PJ, and Turner, AN. Lower extremity stiffness: considerations for testing, performance enhancement, and injury risk. J Strength Cond Res XX(X): 000-000, 2017-Force-deformation characteristics of the lower limb have been associated with athletic performance and may modulate the risk of injury. Despite these known associations, measurements of lower extremity stiffness are not commonly administered by strength and conditioning coaches. This review provides an overview of the available literature pertaining to the effects of lower extremity stiffness on physical performance and injury risk...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29112051/a-comparison-of-the-effects-of-short-term-plyometric-and-resistance-training-on-lower-body-muscular-performance
#5
Malcolm T Whitehead, Timothy P Scheett, Michael R McGuigan, N Z Auckland, Angel V Martin
The purpose of this study was to compare effects of short-term plyometric and resistance training on lower body muscular performance. A convenience sample of thirty males aged 21.3 ± 1.8 years, height 177.3 ± 9.4 cm, mass 80.0 ± 2.6 kg, body fat 16.1 ± 1.2 % participated in this investigation. Participants were grouped and participated in progressive plyometric (PLT) or resistance training (SRT) twice per week for eight consecutive weeks or a control (CNT) group that did not participate in any training...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023331/effects-of-plyometric-training-on-components-of-physical-fitness-in-prepuberal-male-soccer-athletes-the-role-of-surface-instability
#6
Yassine Negra, Helmi Chaabene, Senda Sammoud, Raja Bouguezzi, Bessem Mkaouer, Younés Hachana, Urs Granacher
Negra, Y, Chaabene, H, Sammoud, S, Bouguezzi, R, Mkaouer, B, Hachana, Y, and Granacher, U. Effects of plyometric training on components of physical fitness in prepuberal male soccer athletes: the role of surface instability. J Strength Cond Res XX(X): 000-000, 2017-Previous studies contrasted the effects of plyometric training (PT) conducted on stable vs. unstable surfaces on components of physical fitness in child and adolescent soccer players. Depending on the training modality (stable vs. unstable), specific performance improvements were found for jump (stable PT) and balance performances (unstable PT)...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023328/strength-and-conditioning-habits-of-competitive-distance-runners
#7
Richard C Blagrove, Nicola Brown, Glyn Howatson, Philip R Hayes
Blagrove, RC, Brown, N, Howatson, G, and Hayes, PR. Strength and conditioning habits of competitive distance runners. J Strength Cond Res XX(X): 000-000, 2017-Targeted strength and conditioning (S&C) programs can potentially improve performance and reduce injury risk factors in competitive runners. However, S&C practices of distance runners are unknown. This study aimed to explore S&C practices of competitive middle- and long-distance runners and examined whether reported frequency of injuries was influenced by training behaviors...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29019743/injury-prevention-in-male-youth-soccer-current-practices-and-perceptions-of-practitioners-working-at-elite-english-academies
#8
Paul J Read, Pablo Jimenez, Jon L Oliver, Rhodri S Lloyd
Forty-one practitioners inclusive of physiotherapists, sports scientists and strength and conditioning coaches from the academies of elite soccer clubs in the United Kingdom completed an on-line questionnaire which examined their: (1) background information; (2) perceptions of injury occurrence and risk factors; (3) screening and return to play; and (4) approach to designing and delivering injury prevention programmes with a response rate of 55% (41/75). Contact injuries were the most common mechanism reported and players between 13-16 years of age were perceived to be at the greatest risk...
October 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29018362/effects-of-unloaded-vs-loaded-plyometrics-on-speed-and-power-performance-of-elite-young-soccer-players
#9
Ronaldo Kobal, Lucas A Pereira, Vinicius Zanetti, Rodrigo Ramirez-Campillo, Irineu Loturco
The purpose of this study was to investigate the effects of loaded and unloaded plyometric training strategies on speed and power performance of elite young soccer players. Twenty-three under-17 male soccer players (age: 15.9 ± 1.2 years, height: 178.3 ± 8.1 cm, body-mass (BM): 68.1 ± 9.3 kg) from the same club took part in this study. The athletes were pair-matched in two training groups: loaded vertical and horizontal jumps using an haltere type handheld with a load of 8% of the athletes' body mass (LJ; n = 12) and unloaded vertical and horizontal plyometrics (UJ; n = 11)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28979857/osteoarthritis-action-alliance-consensus-opinion-best-practice-features-of-anterior-cruciate-ligament-and-lower-limb-injury-prevention-programs
#10
Thomas Trojian, Jeffrey Driban, Rathna Nuti, Lindsay Distefano, Hayley Root, Cristina Nistler, Cynthia LaBella
AIM: To identify best practice features of an anterior cruciate ligament (ACL) and lower limb injury prevention programs (IPPs) to reduce osteoarthritis (OA). METHODS: This consensus statement started with us performing a systematic literature search for all relevant articles from 1960 through January 2017 in PubMed, Web of Science and CINAHL. The search strategy combined the Medical Subject Heading (MeSH) and keywords for terms: (1) ACL OR "knee injury" OR "anterior cruciate ligament"; (2) "prevention and control" OR "risk reduction" OR "injury prevention" OR "neuromuscular training"; and (3) meta-analysis OR "systematic review" OR "cohort study" OR randomized...
September 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28945640/-ballistic-six-upper-extremity-plyometric-training-for-the-pediatric-volleyball-players
#11
Elif Turgut, Ozge Cinar-Medeni, Filiz F Colakoglu, Gul Baltaci
The Ballistic Six exercise program includes commonly used upper-body exercises, and the program is recommended for overhead throwing athletes. The purpose of the current study was to investigate the effects of a 12-week the Ballistic Six upper-extremity plyometric training program on upper-body explosive power, endurance, and reaction time in pediatric overhead athletes. Twenty-eight female pediatric volleyball players participated in the study. The participants were randomly divided into 2 study groups: an intervention group (upper-extremity plyometric training in addition to the volleyball training; n = 14) and a control group (the volleyball training only; n = 14)...
September 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28944722/is-strength-training-frequency-a-key-factor-to-develop-performance-adaptations-in-young-elite-soccer-players
#12
Carlos Otero-Esquina, Moisés de Hoyo Lora, Óliver Gonzalo-Skok, Sergio Domínguez-Cobo, Hugo Sánchez
The aim of this study was to analyse the effects of a combined strength-training programme (full-back squat, YoYo(TM) leg curl, plyometrics and sled towing exercises) on performance in elite young soccer players and to examine the effects when this training programme was performed one or two days per week. Thirty-six male soccer players (U-17 to U-19) were recruited and assigned to experimental groups (EXP1: 1 s w(-1); EXP2: 2 s w(-1)) or a control group (CON). Performance was assessed through a countermovement jump (CMJ) test (relative peak power [CMJPP] and CMJ height [CMJH]), a 20-m linear sprint test with split-times at 10-m, and a change of direction test (V-cut test) 1 week before starting the training programme and also 1 week after performing such training programme...
September 24, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28940037/satellite-cell-activation-and-mtor-signaling-pathway-response-to-resistance-and-combined-exercise-in-elite-weight-lifters
#13
Chang Hyun Lim, Thien Suong Luu, Le Quy Phoung, Tae Seok Jeong, Chang Keun Kim
PURPOSE: Our aim was to compare the effects of a single exercise training mode (resistance exercise) with a combined exercise training (resistance and plyometric exercise) mode on satellite cell activity and anabolic signaling at the molecular level. METHODS: Eighteen male weight lifters (20 ± 4 years, BMI 27 ± 6 kg/m(2)) were randomly assigned to either a series of resistance exercise or a series of combined exercise group. The intensity of the exercise was set at 60% of their 1 RM weight and subjects completed three sets each of six repetitions...
November 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28933713/adaptations-associated-with-an-after-school-strength-and-conditioning-program-in-middle-school-aged-boys-a-quasi-experimental-design
#14
Brennan J Thompson, Matt S Stock, Jacob A Mota, Alexander S Drusch, Ryan N DeFranco, Tyler R Cook, Matthew A Hamm
High-intensity strength and conditioning programs aimed at improving youth performance are becoming increasingly prevalent. The purpose of this study was to investigate the effects of a 16-week after-school strength and conditioning program on performance and body composition in middle-school-aged boys. Subjects in the training group (n = 16, mean age = 11.8 years) performed 90 minutes of supervised plyometric and resistance training twice weekly for 16 weeks. A group of control subjects (n = 9, age = 12.1 years) maintained their current activity levels...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930932/complex-training-the-effect-of-exercise-selection-and-training-status-on-postactivation-potentiation-in-rugby-league-players
#15
David J Scott, Massimiliano Ditroilo, Phil A Marshall
This study compared the postactivation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and 10 amateur rugby league players performed 2 experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14, and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1 repetition maximum of either HBD or BS...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900562/a-biomechanical-comparison-among-three-kinds-of-rebound-type-jumps-in-female-collegiate-athletes
#16
Miki Nariai, Naruto Yoshida, Atsushi Imai, Kazumichi Ae, Ryo Ogaki, Hirokazu Suhara, Hitoshi Shiraki
BACKGROUND: Single-legged drop jumps (SDJ), single-legged repetitive jumps (SRJ), and single-legged side hops (SSH) are often used as plyometric training and functional performance tests. Differences in the kinetics and kinematic characteristics of lower extremity joints during these jumps are unclear. HYPOTHESIS/PURPOSE: The purpose of this study was to investigate the joint motion and mechanical work of the takeoff leg from foot contact to foot-off during SDJ, SRJ, and SSH in the sagittal and frontal planes in female athletes...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28880052/effects-of-volleyball-plyometric-intervention-program-on-vertical-jumping-ability-in-male-volleyball-players
#17
Dariusz Mroczek, Krzysztof Maćkała, Adam Kawczynski, Edward Superlak, Paweł Chmura, Tomasz Seweryniak, Jan Chmura
BACKGROUND: This study aimed to investigate the effect of a 6-week plyometric exercise training program on the development of lower limb explosive power in terms of vertical jumping ability in university level volleyball players. The study involved 9 male volleyball players from the AWF Wroclaw University Sports Club, with a minimum of 5 years of training and competition experience. The program consisted of various bounds, hops, and jumps in vertical, horizontal, and mixed directions...
September 5, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28872400/what-is-the-most-effective-training-approach-for-preventing-noncontact-acl-injuries-in-high-school-aged-female-athletes
#18
Erica M Willadsen, Andrea B Zahn, Chris J Durall
CLINICAL SCENARIO: The high prevalence of noncontact anterior cruciate ligament (ACL) injuries in adolescent female athletes is thought to originate from hormonal, neuromuscular, and structural differences between sexes.(1) Although hormonal and structural factors are non-modifiable, neuromuscular control can be altered with training. A variety of training approaches have been adopted in ACL prevention programs including neuromuscular control training, core stability training, balance training, and plyometric exercise...
September 5, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28869635/assessing-the-impact-of-a-targeted-plyometric-training-on-changes-in-selected-kinematic-parameters-of-the-swimming-start
#19
Marek Rejman, Marek Bilewski, Stefan Szczepan, Andrzej Klarowicz, Daria Rudnik, Krzysztof Maćkała
PURPOSE: The aim of this study was to analyse changes taking place within selected kinematic parameters of the swimming start, after completing a six-week plyometric training, assuming that the take-off power training improves its effectiveness. METHODS: The experiment included nine male swimmers. In the pre-test the swimmers performed three starts focusing on the best performance. Next, a plyometric training programme, adapted from sprint running, was introduced in order to increase a power of the lower extremities...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28858051/long-term-changes-in-jump-performance-and-maximum-strength-in-a-cohort-of-ncaa-division-i-women-s-volleyball-athletes
#20
Ashley A Kavanaugh, Satoshi Mizuguchi, William A Sands, Michael W Ramsey, Michael H Stone
The purpose of this investigation was to quantify the magnitude of change in maximal strength and jumping abilities over approximately one, two, and three years of supervised sport and resistance training in NCAA Division I women's volleyball athletes. This was an exploratory study on a cohort of women's volleyball athletes (n=29) split into three groups based on length of time spent in a supervised resistance training program: group 1 (n=11): 0.7±0.3 yrs, group 2 (n=9): 1.6±0.2 yrs, and group 3 (n=9): 2...
August 26, 2017: Journal of Strength and Conditioning Research
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