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Hamstring eccentrics

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https://www.readbyqxmd.com/read/29143379/region-dependent-hamstrings-activity-in-nordic-hamstring-exercise-and-stiff-leg-deadlift-defined-with-high-density-emg
#1
András Hegyi, Annamária Péter, Taija Finni, Neil J Cronin
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activity were recorded with high-density electromyography (HD-EMG)...
November 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29143267/hamstring-injury-prevention-practices-in-elite-sport-evidence-for-eccentric-strength-vs-lumbo-pelvic-training
#2
REVIEW
Anthony J Shield, Matthew N Bourne
Hamstring strain injuries are endemic in running-based sports. Given the economic and performance implications of these injuries, a significant body of research has emerged in recent years in an attempt to identify risk factors and develop or optimise injury prevention strategies. Surveys of injury prevention practices among medical and conditioning staff in elite sport suggest that many sporting clubs invest significant efforts in eccentric hamstring conditioning and lumbo-pelvic or trunk stability programmes...
November 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29116573/an-evidence-based-framework-for-strengthening-exercises-to-prevent-hamstring-injury
#3
REVIEW
Matthew N Bourne, Ryan G Timmins, David A Opar, Tania Pizzari, Joshua D Ruddy, Casey Sims, Morgan D Williams, Anthony J Shield
Strength training is a valuable component of hamstring strain injury prevention programmes; however, in recent years a significant body of work has emerged to suggest that the acute responses and chronic adaptations to training with different exercises are heterogeneous. Unfortunately, these research findings do not appear to have uniformly influenced clinical guidelines for exercise selection in hamstring injury prevention or rehabilitation programmes. The purpose of this review was to provide the practitioner with an evidence-base from which to prescribe strengthening exercises to mitigate the risk of hamstring injury...
November 7, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29076959/effects-of-pre-competitive-preparation-period-on-the-isokinetic-muscular-characteristics-in-world-class-handball-players
#4
Olivier Maurelli, Pierre Louis Bernard, Romain Dubois, Said Ahmaidi, Jacques Prioux
The aim of this study was to describe the effects of eight weeks of pre-competitive period preparation (Pc2P) on the isokinetic muscular characteristics in world-class handball players. Nineteen male professional players (age: 26.6 ± 5.4 years) participated in the study. Two bilateral isokinetic tests of knee joint flexors (H; Hamstring) and extensors (Q; Quadriceps) were performed before and after Pc2P to determine the peak torque (PT), the mean power (MP) and the ratios (agonist/antagonist, dominant/non-dominant and combined)...
October 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29073840/a-novel-apparatus-measuring-knee-flexor-strength-during-various-hamstring-exercises-a-reliability-and-retrospective-study
#5
Jack T Hickey, Peter F Hickey, Nirav Maniar, Ryan G Timmins, Morgan D Williams, Christian A Pitcher, David A Opar
Study Design Reliability and case-control injury study. Background Knee flexor strength is a key variable when dealing with hamstring strain injury (HSI) and methodologies of objective measurement are often limited to single exercises. Objectives To establish test re-test reliability of a novel apparatus measuring knee flexor strength during various hamstring exercises; to investigate whether these measures detect between-leg differences in males with and without history of unilateral HSI. Methods Twenty males without and ten males with previous unilateral HSI participated...
October 26, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29072027/effect-of-stretching-based-rehabilitation-on-pain-flexibility-and-muscle-strength-in-dancers-with-hamstring-injury-a-single-blind-prospective-randomized-clinical-trial
#6
Giwon Kim, Hyangsun Kim, Woo K Kim, Junesun Kim
BACKGROUND: Hamstring injuries commonly occur in mainstream sports and occupations that involve physical activity. We evaluated the effect of a stretching-based rehabilitation program on pain, flexibility, and strength in dancers with hamstring injuries. METHODS: Sixteen Korean traditional dancers with unilateral hamstring injuries were included and randomly assigned to a rehabilitation or control group. The rehabilitation group received stretching-based rehabilitation for 8 weeks, which comprised simple static stretches and basic range of motion (ROM) exercises, such as static and active stretching, concentric and eccentric ROM training, and trunk stabilization exercises...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29019743/injury-prevention-in-male-youth-soccer-current-practices-and-perceptions-of-practitioners-working-at-elite-english-academies
#7
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/28954794/the-effectiveness-of-extracorporeal-shockwave-therapy-in-common-lower-limb-conditions-a-systematic-review-including-quantification-of-patient-rated-pain-reduction
#8
REVIEW
Vasileios Korakakis, Rodney Whiteley, Alexander Tzavara, Nikolaos Malliaropoulos
OBJECTIVE: To evaluate extracorporeal shockwave therapy (ESWT) in treating Achilles tendinopathy (AT), greater trochanteric pain syndrome (GTPS), medial tibial stress syndrome (MTSS), patellar tendinopathy (PT) and proximal hamstring tendinopathy (PHT). DESIGN: Systematic review. ELIGIBILITY CRITERIA: Randomised and non-randomised studies assessing ESWT in patients with AT, GTPS, MTSS, PT and PHT were included. Risk of bias and quality of studies were evaluated...
September 27, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28923589/an-investigation-into-the-immediate-effects-of-pelvic-taping-on-hamstring-eccentric-force-in-an-elite-male-sprinter-a-case-report
#9
Ben Macdonald
BACKGROUND: Hamstring Injuries commonly cause missed training and competition time in elite sports. Injury surveillance studies have demonstrated high injury and re-injury rates, which have not improved across sports despite screening and prevention programmes being commonplace. The most commonly suggested intervention for hamstring prevention and rehabilitation is eccentric strength assessment and training. CASE DESCRIPTION: This case study describes the management of an elite sprinter with a history of hamstring injury...
November 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28912650/the-effects-combining-cryocompression-therapy-following-an-acute-bout-of-resistance-exercise-on-performance-and-recovery
#10
William H DuPont, Brek J Meuris, Vincent H Hardesty, Emily C Barnhart, Landon H Tompkins, Morricia J P Golden, Clayton J Usher, Paul A Spence, Lydia K Caldwell, Emily M Post, Matthew K Beeler, William J Kraemer
Compression and cold therapy used separately have shown to reduce negative effects of tissue damage. The combining compression and cold therapy (cryocompression) as a single recovery modality has yet to be fully examined. To examine the effects of cryocompression on recovery following a bout of heavy resistance exercise, recreationally resistance trained men (n =16) were recruited, matched, and randomly assigned to either a cryocompression group (CRC) or control group (CON). Testing was performed before and then immediately after exercise, 60 minutes, 24 hours, and 48 hours after a heavy resistance exercise workout (barbell back squats for 4 sets of 6 reps at 80% 1RM, 90 sec rest between sets, stiff legged deadlifts for 4 sets of 8 reps at 1...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28886473/strategies-for-injury-prevention-in-brazilian-football-perceptions-of-physiotherapists-and-practices-of-premier-league-teams
#11
Maurício Couto Meurer, Marcelo Faria Silva, Bruno Manfredini Baroni
OBJECTIVES: To describe the physiotherapists perceptions and the current practices for injury prevention in elite football (soccer) clubs in Brazil. DESIGN: Cross-sectional study. SETTING: Group of Science in Sports & Exercise, Federal University of Healthy Sciences of Porto Alegre (Brazil). PARTICIPANTS: 16 of the 20 football clubs involved in the Brazilian premier league 2015. MAIN OUTCOME MEASURES: Physiotherapists answered a structured questionnaire...
November 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28884093/hamstring-injuries-update-article
#12
Lucio Ernlund, Lucas de Almeida Vieira
Hamstring (HS) muscle injuries are the most common injury in sports. They are correlated to long rehabilitations and have a great tendency to recur. The HS consist of the long head of the biceps femoris, semitendinosus, and semimembranosus. The patient's clinical presentation depends on the characteristics of the lesion, which may vary from strain to avulsions of the proximal insertion. The most recognized risk factor is a previous injury. Magnetic resonance imaging is the method of choice for the injury diagnosis and classification...
June 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28830536/the-preventive-effect-of-the-bounding-exercise-programme-on-hamstring-injuries-in-amateur-soccer-players-the-design-of-a-randomized-controlled-trial
#13
S Van de Hoef, B M A Huisstede, M S Brink, N de Vries, E A Goedhart, F J G Backx
BACKGROUND: Hamstring injuries are the most common muscle injury in amateur and professional soccer. Most hamstring injuries occur in the late swing phase, when the hamstring undergoes a stretch-shortening cycle and the hamstring does a significant amount of eccentric work. The incidence of these injuries has not decreased despite there being effective injury prevention programmes focusing on improving eccentric hamstring strength. As this might be because of poor compliance, a more functional injury prevention exercise programme that focuses on the stretch-shortening cycle might facilitate compliance...
August 22, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28827499/intrarater-reliability-of-muscle-strength-and-hamstring-to-quadriceps-strength-imbalance-ratios-during-concentric-isometric-and-eccentric-maximal-voluntary-contractions-using-the-isoforce-dynamometer
#14
Anett Mau-Moeller, Martin Gube, Sabine Felser, Frank Feldhege, Matthias Weippert, Florian Husmann, Thomas Tischer, Rainer Bader, Sven Bruhn, Martin Behrens
OBJECTIVE: To determine intrasession and intersession reliability of strength measurements and hamstrings to quadriceps strength imbalance ratios (H/Q ratios) using the new isoforce dynamometer. DESIGN: Repeated measures. SETTING: Exercise science laboratory. PARTICIPANTS: Thirty healthy subjects (15 females, 15 males, 27.8 years). MAIN OUTCOME MEASURES: Coefficient of variation (CV) and intraclass correlation coefficients (ICC) were calculated for (1) strength parameters, that is peak torque, mean work, and mean power for concentric and eccentric maximal voluntary contractions; isometric maximal voluntary torque (IMVT); rate of torque development (RTD), and (2) H/Q ratios, that is conventional concentric, eccentric, and isometric H/Q ratios (Hcon/Qcon at 60 deg/s, 120 deg/s, and 180 deg/s, Hecc/Qecc at -60 deg/s and Hiso/Qiso) and functional eccentric antagonist to concentric agonist H/Q ratios (Hecc/Qcon and Hcon/Qecc)...
August 17, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28806100/including-the-copenhagen-adduction-exercise-in-the-fifa-11-provides-missing-eccentric-hip-adduction-strength-effect-in-male-soccer-players-a-randomized-controlled-trial
#15
Joar Harøy, Kristian Thorborg, Andreas Serner, André Bjørkheim, Linn E Rolstad, Per Hölmich, Roald Bahr, Thor Einar Andersen
BACKGROUND: The FIFA 11+ was developed as a complete warm-up program to prevent injuries in soccer players. Although reduced hip adduction strength is associated with groin injuries, none of the exercises included in the FIFA 11+ seem to specifically target hip adduction strength. PURPOSE: To investigate the effect on eccentric hip adduction strength of the FIFA 11+ warm-up program with or without the Copenhagen adduction exercise. STUDY DESIGN: Randomized controlled trial; Level of evidence, 1...
November 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28761699/high-intensity-flywheel-exercise-and-recovery-of-atrophy-after-90-days-bed-rest
#16
Daniel L Belavý, Hiroshi Ohshima, Jörn Rittweger, Dieter Felsenberg
AIMS: To investigate differential muscle atrophy during bed-rest, the impact of a high-intensity concentric-eccentric (flywheel) resistance exercise countermeasure and muscle recovery after bed-rest. METHODS: Twenty-five healthy male subjects underwent 90 dayshead-down tilt bed-rest. Volume of individual lower-limb muscles was measured via MRI before, twice during and four times up to 1 year after bed-rest. Subjects were either inactive (n=16) or performed flywheel exercise every third day of bed-rest (n=9)...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/28756392/a-comprehensive-strength-testing-protocol-offers-no-clinical-value-in-predicting-risk-of-hamstring-injury-a-prospective-cohort-study-of-413-professional-football-players
#17
Nicol van Dyk, Roald Bahr, Angus F Burnett, Rod Whiteley, Arnhild Bakken, Andrea Mosler, Abdulaziz Farooq, Erik Witvrouw
BACKGROUND: Hamstring injuries remain prevalent across a number of professional sports. In football, the incidence has even increased by 4% per year at the Champions League level over the last decade. The role of muscle strength or strength ratios and their association with risk of hamstring injury remain restricted by small sample sizes and inconclusive results. PURPOSE: The purpose of this study is to identify risk factors for hamstring injury in professional football players in an adequately powered, prospective cohort study...
July 29, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28713460/effects-of-an-elastic-hamstring-assistance-device-during-downhill-running
#18
Randy L Aldret, Brittany A Trahan, Greggory Davis, Brian Campbell, David M Bellar
The purpose of this study was to determine the appropriateness of using an elastic hamstring assistance device to reduce perceived levels of soreness, increase isometric strength, increase passive range of motion, and decrease biomarkers of muscle damage after eccentric exercise, specifically, downhill running This study was conducted in a university exercise physiology laboratory placing sixteen apparently healthy males (X = 21.6 ± 2.5 years) into two groups using a pre-test/post-test design. Pre-intervention measures taken included participants' body height, body mass, body fat, capillary blood samples, VO2max, isometric hamstring strength at 45 and 90 degrees of flexion and passive hamstring range of motion...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28704309/effect-of-three-different-muscle-action-training-protocols-on-knee-strength-ratios-and-performance
#19
Cassio V Ruas, Lee E Brown, Camila D Lima, Pablo B Costa, Ronei S Pinto
Hamstring to quadriceps (H:Q) ratios are often used to assess strength imbalances. The aims of this study were to compare three different muscle action training protocols on H:Q strength balance and functional performance. Forty untrained males (age: 22.87 ± 2.28 y, mass: 70.66 ± 11.049 kg, ht: 174.29 ± 6.90 cm) performed 6 weeks of training on an isokinetic dynamometer. They were randomly assigned to one of 4 groups; concentric quadriceps and concentric hamstring (CON/CON), eccentric quadriceps and eccentric hamstring (ECC/ECC), concentric quadriceps and eccentric hamstring (CON/ECC), or no training (CNTRL)...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28630577/effects-of-high-velocity-elastic-band-versus-heavy-resistance-training-on-hamstring-strength-activation-and-sprint-running-performance
#20
Donatas Janusevicius, Audrius Snieckus, Albertas Skurvydas, Viktoras Silinskas, Eugenijus Trinkunas, Joan Aureli Cadefau, Sigitas Kamandulis
Hamstring muscle injuries occur during high-speed activities, which suggests that muscular strength at high velocities may be more important than maximal strength. This study examined hamstring adaptations to training for maximal strength and for strength at high velocities. Physically active men (n = 25; age, 23.0 ± 3.2 years) were randomly divided into: (1) a resistance training (RT, n = 8) group, which performed high-load, low-velocity concentric-eccentric hamstring contractions; (2) a resistance training concentric (RTC; n = 9) group, which performed high-load, low-velocity concentric-only hamstring contractions; and (3) a high-velocity elastic band training (HVT, n = 8) group, which performed low-load, high-velocity concentric-eccentric hamstring contractions...
June 2017: Journal of Sports Science & Medicine
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