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"Nordic hamstring"

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https://www.readbyqxmd.com/read/27752982/effect-of-injury-prevention-programs-that-include-the-nordic-hamstring-exercise-on-hamstring-injury-rates-in-soccer-players-a-systematic-review-and-meta-analysis
#1
Wesam Saleh A Al Attar, Najeebullah Soomro, Peter J Sinclair, Evangelos Pappas, Ross H Sanders
BACKGROUND: Hamstring injuries are among the most common non-contact injuries in sports. The Nordic hamstring (NH) exercise has been shown to decrease risk by increasing eccentric hamstring strength. OBJECTIVE: The purpose of this systematic review and meta-analysis was to investigate the effectiveness of the injury prevention programs that included the NH exercise on reducing hamstring injury rates while factoring in athlete workload. METHODS: Two researchers independently searched for eligible studies using the following databases: the Cochrane Central Register of Controlled Trials via OvidSP, AMED (Allied and Complementary Medicine) via OvidSP, EMBASE, PubMed, MEDLINE, SPORTDiscus, Web of Science, CINAHL and AusSportMed, from inception to December 2015...
October 17, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27660368/impact-of-the-nordic-hamstring-and-hip-extension-exercises-on-hamstring-architecture-and-morphology-implications-for-injury-prevention
#2
Matthew N Bourne, Steven J Duhig, Ryan G Timmins, Morgan D Williams, David A Opar, Aiman Al Najjar, Graham K Kerr, Anthony J Shield
BACKGROUND: The architectural and morphological adaptations of the hamstrings in response to training with different exercises have not been explored. PURPOSE: To evaluate changes in biceps femoris long head (BFLH) fascicle length and hamstring muscle size following 10-weeks of Nordic hamstring exercise (NHE) or hip extension (HE) training. METHODS: 30 recreationally active male athletes (age, 22.0±3.6 years; height, 180.4±7 cm; weight, 80...
September 22, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/27583444/mri-based-regional-muscle-use-during-hamstring-strengthening-exercises-in-elite-soccer-players
#3
Alberto Mendez-Villanueva, Luis Suarez-Arrones, Gil Rodas, Rodrigo Fernandez-Gonzalo, Per Tesch, Richard Linnehan, Richard Kreider, Valter Di Salvo
The present study examined site-specific hamstring muscles use with functional magnetic resonance imaging (MRI) in elite soccer players during strength training. Thirty-six players were randomized into four groups, each performing either Nordic hamstring, flywheel leg-curl, Russian belt or the hip-extension conic-pulley exercise. The transverse relaxation time (T2) shift from pre- to post-MRI were calculated for the biceps femoris long (BFl) and short (BFs) heads, semitendinosus (ST) and semimembranosus (SM) muscles at proximal, middle and distal areas of the muscle length...
2016: PloS One
https://www.readbyqxmd.com/read/27536252/hamstring-architectural-and-functional-adaptations-following-long-vs-short-muscle-length-eccentric-training
#4
Kenny Guex, Francis Degache, Cynthia Morisod, Matthieu Sailly, Gregoire P Millet
Most common preventive eccentric-based exercises, such as Nordic hamstring do not include any hip flexion. So, the elongation stress reached is lower than during the late swing phase of sprinting. The aim of this study was to assess the evolution of hamstring architectural (fascicle length and pennation angle) and functional (concentric and eccentric optimum angles and concentric and eccentric peak torques) parameters following a 3-week eccentric resistance program performed at long (LML) vs. short muscle length (SML)...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27467517/effects-of-a-10-week-nordic-hamstring-exercise-and-russian-belt-training-on-posterior-lower-limb-muscle-strength-in-elite-junior-soccer-players
#5
Ezequiel Rey, Álvaro Paz-Domínguez, David Porcel-Almendral, Víctor Paredes-Hernández, Roberto Barcala-Furelos, Cristian Abelairas-Gómez
The purpose of this study was to assess the effect of two eccentric hamstring training exercises, Nordic hamstring (NHE) and Russian belt (RB), on lower limb strength and bilateral asymmetry using the Single Leg Hamstring Bridge (SLHB) test. Forty-seven elite junior soccer players (age 17.7±0.5 years, height 175.3±3.6 cm, body mass 68.1±7.4 kg) were randomized into one of three groups, the NHE group (n= 16), RB group (n= 15), or the control group (CG) (n= 16). The eccentric training intervention consisted of 27 supervised training sessions over 10 weeks...
July 26, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27467123/impact-of-exercise-selection-on-hamstring-muscle-activation
#6
Matthew N Bourne, Morgan D Williams, David A Opar, Aiman Al Najjar, Graham K Kerr, Anthony J Shield
OBJECTIVE: To determine which strength training exercises selectively activate the biceps femoris long head (BFLongHead) muscle. METHODS: We recruited 24 recreationally active men for this two-part observational study. Part 1: We explored the amplitudes and the ratios of lateral (BF) to medial hamstring (MH) normalised electromyography (nEMG) during the concentric and eccentric phases of 10 common strength training exercises. Part 2: We used functional MRI (fMRI) to determine the spatial patterns of hamstring activation during two exercises which (1) most selectively and (2) least selectively activated the BF in part 1...
May 13, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/27267402/acute-neuromuscular-and-performance-responses-to-nordic-hamstring-exercises-completed-before-or-after-football-training
#7
Ric Lovell, Jason C Siegler, Michael Knox, Scott Brennan, Paul W M Marshall
The optimal scheduling of Nordic Hamstring exercises (NHEs) relative to football training sessions is unknown. We examined the acute neuromuscular and performance responses to NHE undertaken either before (BT) or after (AT) simulated football training. Twelve amateur players performed six sets of five repetitions of the NHE either before or after 60 min of standardised football-specific exercise (SAFT(60)). Surface electromyography signals (EMG) of the hamstring muscles were recorded during both the NHE, and maximum eccentric actions of the knee flexors (0...
June 6, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27116347/individual-muscle-use-in-hamstring-exercises-by-soccer-players-assessed-using-functional-mri
#8
R Fernandez-Gonzalo, P A Tesch, R M Linnehan, R B Kreider, V Di Salvo, L Suarez-Arrones, X Alomar, A Mendez-Villanueva, G Rodas
This study used functional magnetic resonance imaging (fMRI) to compare individual muscle use in exercises aimed at preventing hamstring injuries. Thirty-six professional soccer players were randomized into 4 groups, each performing either Nordic hamstring, flywheel leg curl, Russian belt or conic-pulley exercise. MRIs were performed before and immediately after a bout of 4 sets of 8 repetitions. Pre-post exercise differences in contrast shift (T2) were analyzed for the long (BFLh) and short head (BFSh) of biceps femoris, semitendinosus (ST), semimembranosus (SM) and gracilis (GR) muscles...
June 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/26925310/comparisons-of-eccentric-knee-flexor-strength-and-asymmetries-across-elite-sub-elite-and-school-level-cricket-players
#9
Wade J Chalker, Anthony J Shield, David A Opar, Justin W L Keogh
Background. There has been a continual increase in injury rates in cricket, with hamstring strain injuries (HSIs) being the most prominent. Eccentric knee flexor weakness and bilateral asymmetries are major modifiable risk factors for future HSIs. However, there is a lack of data relating to eccentric hamstring strength in cricket at any skill level. The objective of this study was to compare eccentric knee flexor strength and bilateral asymmetries in elite, sub-elite and school level cricket players; and to determine if playing position and limb role influenced these eccentric knee flexor strength indices...
2016: PeerJ
https://www.readbyqxmd.com/read/26638728/the-effect-of-body-mass-on-eccentric-knee-flexor-strength-assessed-with-an-instrumented-nordic-hamstring-device-nordbord-in-football-players
#10
Martin Buchheit, Yannick Cholley, Mark Nagel, Nicholas Poulos
PURPOSE: The aims of the present study were to 1) examine the effect of body mass (BM) on eccentric knee flexor strength using the Nordbord, and 2) offer simple guidelines to control for effect of BM on knee flexors strength. METHODS: Data from 81 soccer players (U17, U19, U21, senior 4th French division and professionals) and 41 Australian Football League (AFL) players were used for analysis. They all performed one set of three maximal repetitions of the bilateral Nordic hamstring exercise, with the greatest strength measure used for analysis...
December 2, 2015: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26429732/biceps-femoris-architecture-and-strength-in-athletes-with-a-previous-anterior-cruciate-ligament-reconstruction
#11
Ryan G Timmins, Matthew N Bourne, Anthony J Shield, Morgan D Williams, Christian Lorenzen, David A Opar
PURPOSE: This study aimed to determine whether limbs with a history of anterior cruciate ligament (ACL) injury reconstructed from the semitendinosus display different biceps femoris long head (BFlh) architecture and eccentric strength, assessed during the Nordic hamstring exercise, compared with the contralateral uninjured limb. METHODS: The architectural characteristics of the BFlh were assessed at rest and at 25% of a maximal voluntary isometric contraction (MVIC) in the control group (n = 52) and in the group who had previous ACL injury (n = 15) using two-dimensional ultrasonography...
March 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/26337245/eccentric-knee-flexor-strength-and-risk-of-hamstring-injuries-in-rugby-union-a-prospective-study
#12
Matthew N Bourne, David A Opar, Morgan D Williams, Anthony J Shield
BACKGROUND: Hamstring strain injuries (HSIs) represent the most common cause of lost playing time in rugby union. Eccentric knee flexor weakness and between-limb imbalance in eccentric knee flexor strength are associated with a heightened risk of HSIs in other sports; however, these variables have not been explored in rugby union. PURPOSE: To determine if lower levels of eccentric knee flexor strength or greater between-limb imbalance in this parameter during the Nordic hamstring exercise are risk factors for HSIs in rugby union...
November 2015: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/26105015/hamstring-injuries-prevention-and-treatment-an-update
#13
Peter Brukner
Despite increased knowledge of hamstring muscle injuries, the incidence has not diminished. We now know that not all hamstring injuries are the same and that certain types of injuries require prolonged rehabilitation and return to play. The slow stretch type of injury and injuries involving the central tendon both require longer times to return to play. A number of factors have been proposed as being indicators of time taken to return to play, but the evidence for these is conflicting. Recurrence rates remain high and it is now thought that strength deficits may be an important factor...
October 2015: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/26059634/muscle-activation-patterns-in-the-nordic-hamstring-exercise-impact-of-prior-strain-injury
#14
M N Bourne, D A Opar, M D Williams, A Al Najjar, A J Shield
This study aimed to determine: (a) the spatial patterns of hamstring activation during the Nordic hamstring exercise (NHE); (b) whether previously injured hamstrings display activation deficits during the NHE; and (c) whether previously injured hamstrings exhibit altered cross-sectional area (CSA). Ten healthy, recreationally active men with a history of unilateral hamstring strain injury underwent functional magnetic resonance imaging of their thighs before and after six sets of 10 repetitions of the NHE. Transverse (T2) relaxation times of all hamstring muscles [biceps femoris long head (BFlh); biceps femoris short head (BFsh); semitendinosus (ST); semimembranosus (SM)] were measured at rest and immediately after the NHE and CSA was measured at rest...
June 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/25995308/evidence-based-hamstring-injury-prevention-is-not-adopted-by-the-majority-of-champions-league-or-norwegian-premier-league-football-teams-the-nordic-hamstring-survey
#15
Roald Bahr, Kristian Thorborg, Jan Ekstrand
BACKGROUND: The Nordic hamstring (NH) exercise programme was introduced in 2001 and has been shown to reduce the risk of acute hamstring injuries in football by at least 50%. Despite this, the rate of hamstring injuries has not decreased over the past decade in male elite football. AIM: To examine the implementation of the NH exercise programme at the highest level of male football in Europe, the UEFA Champions League (UCL), and to compare this to the Norwegian Premier League, Tippeligaen, where the pioneer research on the NH programme was conducted...
November 2015: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/25886019/hamstring-fatigue-and-muscle-activation-changes-during-six-sets-of-nordic-hamstring-exercise-in-amateur-soccer-players
#16
Paul W M Marshall, Ric Lovell, Michael F Knox, Scott L Brennan, Jason C Siegler
The Nordic hamstring exercise (NHE) is a bodyweight movement commonly prescribed to increase eccentric hamstring strength and reduce the incidence of strain injury in sport. This study examined hamstring fatigue and muscle activation responses throughout 6 sets of 5 repetitions of the NHE. Ten amateur-level soccer players performed a single session of 6 sets of 5 repetitions of NHE. Maximal eccentric and concentric torque output (in newton meters) was measured after every set. Hamstrings electromyograms (EMG) were measured during all maximal contractions and exercise repetitions...
November 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25794868/the-preventive-effect-of-the-nordic-hamstring-exercise-on-hamstring-injuries-in-amateur-soccer-players-a-randomized-controlled-trial
#17
RANDOMIZED CONTROLLED TRIAL
Nick van der Horst, Dirk-Wouter Smits, Jesper Petersen, Edwin A Goedhart, Frank J G Backx
BACKGROUND: Hamstring injuries are the most common muscle injuries in soccer, and they have a high rate of recurrence. Eccentric hamstrings strength is recognized as an important modifiable risk factor. This led to the development of prevention exercises such as the nordic hamstring exercise (NHE). The effectiveness of the NHE on hamstring injury prevention has never been investigated in amateur soccer. PURPOSE: To investigate the preventive effect of the NHE on the incidence and severity of hamstring injuries in male amateur soccer players...
June 2015: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/25606859/the-validity-of-the-nordic-hamstring-lower-for-a-field-based-assessment-of-eccentric-hamstring-strength
#18
Emma Sconce, Paul Jones, Ellena Turner, Paul Comfort, Philip Graham-Smith
CONTEXT: Hamstring injury-risk assessment has primarily been investigated using isokinetic dynamometry. However, practical issues such as cost and availability limit the widespread application of isokinetics for injury-risk assessment; thus, field-based alternatives for assessing eccentric hamstring strength are needed. OBJECTIVE: The aim of this study was to investigate the validity of the angle achieved during Nordic hamstring lowers (break-point angle) as a field-based test for eccentric hamstring strength...
February 2015: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/25398244/the-effect-of-previous-hamstring-strain-injuries-on-the-change-in-eccentric-hamstring-strength-during-preseason-training-in-elite-australian-footballers
#19
David A Opar, Morgan D Williams, Ryan G Timmins, Jack Hickey, Steven J Duhig, Anthony J Shield
BACKGROUND: Hamstring strain injuries (HSIs) are the most common injury type in Australian football, and the rate of recurrence has been consistently high for a number of years. Long-lasting neuromuscular inhibition has been noted in previously injured athletes, but it is not known if this influences the athlete's adaptive response to training. PURPOSE: To determine if elite Australian footballers with a prior unilateral HSI (previously injured group) display less improvement in eccentric hamstring strength during preseason training compared with athletes without a history of HSIs (control group)...
February 2015: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/25137368/eccentric-hamstring-strength-and-hamstring-injury-risk-in-australian-footballers
#20
David A Opar, Morgan D Williams, Ryan G Timmins, Jack Hickey, Steven J Duhig, Anthony J Shield
PURPOSE: Are eccentric hamstring strength and between-limb imbalance in eccentric strength, measured during the Nordic hamstring exercise, risk factors for hamstring strain injury (HSI)? METHODS: Elite Australian footballers (n = 210) from five different teams participated. Eccentric hamstring strength during the Nordic exercise was obtained at the commencement and conclusion of preseason training and at the midpoint of the season. Injury history and demographic data were also collected...
April 2015: Medicine and Science in Sports and Exercise
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