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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/27632836/ankle-position-during-the-nordic-curl-does-not-affect-muscle-activity-of-the-biceps-femoris-and-medial-gastrocnemius
#3
Paul Comfort, Amy Regan, Lee Herrington, Chris Thomas, John McMahon, Paul Jones
CONTEXT: Regular performance (~2 x week) of Nordic curls has been shown to increase hamstring strength and reduce the risk of hamstring strain injury, although no consensus on ankle position has been provided. OBJECTIVE: The aim of this study was to compare the effects of performing Nordic curls, with the ankle in a dorsiflexed (DF) or plantar flexed (PF) position, on muscle activity of the biceps femoris (BF) and medial gastrocnemius (MG). PARTICIPANTS: Fifteen (age 22...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27583444/mri-based-regional-muscle-use-during-hamstring-strengthening-exercises-in-elite-soccer-players
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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/27075962/hamstring-strength-and-flexibility-after-hamstring-strain-injury-a-systematic-review-and-meta-analysis
#10
REVIEW
Nirav Maniar, Anthony J Shield, Morgan D Williams, Ryan G Timmins, David A Opar
OBJECTIVE: To systematically review the evidence base related to hamstring strength and flexibility in previously injured hamstrings. DESIGN: Systematic review and meta-analysis. DATA SOURCES: A systematic literature search was conducted of PubMed, CINAHL, SPORTDiscus, Cochrane Library, Web of Science and EMBASE from inception to August 2015. INCLUSION CRITERIA: Full-text English articles which included studies which assessed at least one measure of hamstring strength or flexibility in men and women with prior hamstring strain injury within 24 months of the testing date...
August 2016: British 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
#11
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/26797043/ankle-position-during-the-nordic-curl-does-not-affect-muscle-activity-of-the-biceps-femoris-and-medial-gastrocnemius
#12
Paul Comfort, Amy Regan, Lee Herrington, Chris Thomas, John McMahon, Paul Jones
CONTEXT: Regular performance (~2 x week) of Nordic curls has been shown to increase hamstring strength and reduce the risk of hamstring strain injury, although no consensus on ankle position has been provided. OBJECTIVE: The aim of this study was to compare the effects of performing Nordic curls, with the ankle in a dorsiflexed (DF) or plantar flexed (PF) position, on muscle activity of the biceps femoris (BF) and medial gastrocnemius (MG). PARTICIPANTS: Fifteen (age 22...
January 18, 2016: Journal of Sport Rehabilitation
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
#13
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
#14
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
#15
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/26170726/muscle-and-intensity-based-hamstring-exercise-classification-in-elite-female-track-and-field-athletes-implications-for-exercise-selection-during-rehabilitation
#16
Panagiotis Tsaklis, Nikos Malliaropoulos, Jurdan Mendiguchia, Vasileios Korakakis, Kyriakos Tsapralis, Debasish Pyne, Peter Malliaras
BACKGROUND: Hamstring injuries are common in many sports, including track and field. Strains occur in different parts of the hamstring muscle but very little is known about whether common hamstring loading exercises specifically load different hamstring components. The purpose of this study was to investigate muscle activation of different components of the hamstring muscle during common hamstring loading exercises. METHODS: Twenty elite female track and field athletes were recruited into this study, which had a single-sample, repeated-measures design...
2015: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/26105015/hamstring-injuries-prevention-and-treatment-an-update
#17
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
#18
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
#19
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
#20
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
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