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Hamstring Strain

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https://www.readbyqxmd.com/read/28322596/motor-imagery-during-action-observation-increases-eccentric-hamstring-force-an-acute-non-physical-intervention
#1
Matthew Scott, Stephen Taylor, Paul Chesterton, Stefan Vogt, Daniel Lloyd Eaves
PURPOSE: Rehabilitation professionals typically use motor imagery (MI) or action observation (AO) to increase physical strength for injury prevention and recovery. Here we compared hamstring force gains for MI during AO (AO + MI) against two pure MI training groups. MATERIALS AND METHODS: Over a 3-week intervention physically fit adults imagined Nordic hamstring exercises in both legs and synchronized this with a demonstration of the same action (AO + MI), or they purely imagined this action (pure MI), or imagined upper-limb actions (pure MI-control)...
March 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28282673/five-strand-versus-four-strand-hamstring-tendon-graft-technique-for-anterior-cruciate-ligament-reconstruction-a-biomechanical-comparison
#2
Eric R Vaillant, Brent G Parks, Lyn M Camire, Richard Y Hinton
The aim of this article is to compare diameter and stiffness, displacement, and strain in a five-strand versus four-strand hamstring graft for anterior cruciate ligament reconstruction. Eight matched pairs of lower extremities underwent four-strand or five-strand hamstring graft reconstruction. Diameter was significantly higher in the five-strand versus the four-strand construct (p = 0.002). No significant difference was found between the groups in construct displacement or stiffness. Significantly higher strain was observed in the inner limb versus the outer limb in the four-strand construct (p = 0...
March 10, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28280975/the-effect-of-nordic-hamstring-strength-training-on-muscle-architecture-stiffness-and-strength
#3
Kayla D Seymore, Zachary J Domire, Paul DeVita, Patrick M Rider, Anthony S Kulas
PURPOSE: Hamstring strain injury is a frequent and serious injury in competitive and recreational sports. While Nordic hamstring (NH) eccentric strength training is an effective hamstring injury-prevention method, the protective mechanism of this exercise is not understood. Strength training increases muscle strength, but also alters muscle architecture and stiffness; all three factors may be associated with reducing muscle injuries. The purpose of this study was to examine the effects of NH eccentric strength training on hamstring muscle architecture, stiffness, and strength...
March 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28267537/intra-and-interrater-reliability-of-three-different-mri-grading-and-classification-systems-after-acute-hamstring-injuries
#4
Arnlaug Wangensteen, Johannes L Tol, Frank W Roemer, Roald Bahr, H Paul Dijkstra, Michel D Crema, Abdulaziz Farooq, Ali Guermazi
OBJECTIVE: To assess and compare the intra- and interrater reliability of three different MRI grading and classification systems after acute hamstring injury. METHODS: Male athletes (n=40) with clinical diagnosis of acute hamstring injury and MRI ≤5days were selected from a prospective cohort. Two radiologists independently evaluated the MRIs using standardised scoring form including the modified Peetrons grading system, the Chan acute muscle strain injury classification and the British Athletics Muscle Injury Classification...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28259848/calf-muscle-strain-injuries-in-sport-a-systematic-review-of-risk-factors-for-injury
#5
REVIEW
Brady Green, Tania Pizzari
OBJECTIVE: To systematically review the literature to identify risk factors for calf strain injury, and to direct future research into calf muscle injuries. DESIGN: Systematic review DATA SOURCES: Database searches conducted for Medline, CINAHL, EMBASE, AMED, AUSPORT, SportDiscus, PEDro and Cochrane Library. Manual reference checks, ahead of press searches, citation tracking. From inception to June 2016. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Studies evaluating and presenting data related to intrinsic or extrinsic risk factors for sustaining future calf injury...
March 4, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28207979/a-comparison-of-injuries-in-elite-male-and-female-football-players-a-5-season-prospective-study
#6
Jon Larruskain, Jose A Lekue, Nerea Diaz, Adrian Odriozola, Susana M Gil
The aim was to compare the epidemiology of injuries between elite male and female football players from the same club. Injuries and individual exposure time in a male team and a female team, both playing in the Spanish first division, were prospectively recorded by the club's medical staff for five seasons (2010-2015) following the FIFA consensus statement. Total, training and match exposure hours per player-season were 20% higher for men compared to women (P < 0.01). Total, training and match injury incidence were 30-40% higher in men (P ≤ 0...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28190999/higher-drop-in-speed-during-a-repeated-sprint-test-in-soccer-players-reporting-former-hamstring-strain-injury
#7
Ola D Røksund, Morten Kristoffersen, Bård E Bogen, Alexander Wisnes, Merete S Engeseth, Ann-Kristin Nilsen, Vegard V Iversen, Silje Mæland, Hilde Gundersen
Aim: Hamstring strain injury is common in soccer. The aim of this study was to evaluate the physical capacity of players who have and have not suffered from hamstring strain injury in a sample of semi-professional and professional Norwegian soccer players in order to evaluate characteristics and to identify possible indications of insufficient rehabilitation. Method: Seventy-five semi-professional and professional soccer players (19 ± 3 years) playing at the second and third level in the Norwegian league participated in the study...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28161749/cohen-s-mri-scoring-system-has-limited-value-in-predicting-return-to-play
#8
Bruce Hamilton, Arnlaug Wangensteen, Rod Whiteley, Emad Almusa, Liesel Geertsema, Stephen Targett, Johannes L Tol
PURPOSE: Numerous authors have hypothesised that MRI scoring systems provide a valid means of predicting return to play duration following an acute hamstring muscle strain. The purpose is to prospectively investigate the predictive value of the MRI scoring system of Cohen for return to sport (RTS), following an acute hamstring injury. METHODS: Male football (soccer) players (n = 139) with acute onset posterior thigh pain underwent standardised clinical and MRI examinations within 5 days after injury...
February 4, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28149364/evaluating-injury-risk-in-first-and-second-league-professional-portuguese-soccer-muscular-strength-and-asymmetry
#9
Alberto Carvalho, Scott Brown, Eduardo Abade
Strength imbalances between the hamstrings and quadriceps are an essential predictor for hamstring strain in soccer. The study aimed to investigate and compare the muscle strength imbalances of professional soccer players of different performance levels. One hundred and fifty nine senior male professional soccer players from first (n = 75) and second league (n = 84) Portuguese clubs participated in this study. Muscle strength was evaluated with a REV9000 isokinetic dynamometer. Maximal peak torque data were used to calculate quadriceps and hamstrings strength during concentric and eccentric actions, bilateral asymmetry, conventional strength ratios and dynamic control ratios...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28075493/joint-stability-after-canine-cranial-cruciate-ligament-graft-reconstruction-varies-among-femoral-fixation-sites
#10
Louisa K Ho-Eckart, Masahiro Seki, Lindsey M Luizza, Michael T Kearney, Mandi J Lopez
OBJECTIVE: To quantify stability in cranial cruciate ligament (CrCL) deficient canine stifles with hamstring grafts affixed at 3 femoral locations. STUDY DESIGN: Canine stifle motion study using a multi-cohort, repeated measures design. SAMPLE POPULATION: 27 canine cadaver stifles. METHODS: Hamstring grafts (HG) were affixed at the gracilis-semitendinosus insertion and on the lateral femur (1) proximal trochlear ridge (TR), (2) craniodistal to fabella (F), or (3) condyle center (CC)...
February 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28035586/criteria-for-progressing-rehabilitation-and-determining-return-to-play-clearance-following-hamstring-strain-injury-a-systematic-review
#11
REVIEW
Jack T Hickey, Ryan G Timmins, Nirav Maniar, Morgan D Williams, David A Opar
BACKGROUND: Rehabilitation progression and return-to-play (RTP) decision making following hamstring strain injury (HSI) can be challenging for clinicians, owing to the competing demands of reducing both convalescence and the risk of re-injury. Despite an increased focus on the RTP process following HSI, little attention has been paid to rehabilitation progression and RTP criteria, and subsequent time taken to RTP and re-injury rates. OBJECTIVE: The aim of this systematic review is to identify rehabilitation progression and RTP criteria implemented following HSI and examine the subsequent time taken to RTP and rates of re-injury...
December 29, 2016: Sports Medicine
https://www.readbyqxmd.com/read/28008292/incidence-and-prevalence-of-elite-male-cricket-injuries-using-updated-consensus-definitions
#12
John W Orchard, Alex Kountouris, Kevin Sims
BACKGROUND: T20 (Twenty20 or 20 over) cricket has emerged in the last decade as the most popular form of cricket (in terms of spectator attendances). International consensus cricket definitions, first published in 2005, were updated in 2016 to better reflect the rise to prominence of T20 cricket. METHODS: Injury incidence and prevalence rates were calculated using the new international methods and units for elite senior male Australian cricketers over the past decade (season 2006-2007 to season 2015-2016 inclusive)...
2016: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/27884865/running-exposure-is-associated-with-the-risk-of-hamstring-strain-injury-in-elite-australian-footballers
#13
Joshua D Ruddy, Christopher W Pollard, Ryan G Timmins, Morgan D Williams, Anthony J Shield, David A Opar
BACKGROUND: To investigate the association between running exposure and the risk of hamstring strain injury (HSI) in elite Australian footballers. METHODS: Elite Australian footballers (n=220) from 5 different teams participated. Global positioning system (GPS) data were provided for every athlete for each training session and match for the entire 2015 season. The occurrences of HSIs throughout the study period were reported. Receiver operator characteristic curve analyses were performed and the relative risk (RR) of subsequent HSI was calculated for absolute and relative running exposure variables related to distance covered above 10 and 24 km/hour in the preceding week/s...
November 24, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/27870698/risk-factors-for-injury-among-japanese-collegiate-players-of-american-football-based-on-performance-test-results
#14
Junta Iguchi, Yuya Watanabe, Misaka Kimura, Yoshihiko Fujisawa, Tatsuya Hojo, Yasuhiro Yuasa, Shinsuke Higashi, Kenji Kuzuhara
Iguchi, J, Watanabe, Y, Kimura, M, Fujisawa, Y, Hojo, T, Yuasa, Y, Higashi, S, and Kuzuhara, K. Risk factors for injury among Japanese collegiate players of American football based on performance test results. J Strength Cond Res 30(12): 3405-3411, 2016-The purpose of this study was to identify how risk factors for injury during American football are related to players' physical strength as determined using typical performance tests. One hundred 53 Japanese collegiate players of American football were recruited for this study...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27739112/the-functional-significance-of-hamstrings-composition-is-it-really-a-fast-muscle-group
#15
Pavlos E Evangelidis, Garry J Massey, Richard A Ferguson, Patrick C Wheeler, Matthew T G Pain, Jonathan P Folland
Hamstrings muscle fiber composition may be predominantly fast-twitch and could explain the high incidence of hamstrings strain injuries. However, hamstrings muscle composition in vivo, and its influence on knee flexor muscle function, remains unknown. We investigated biceps femoris long head (BFlh) myosin heavy chain (MHC) composition from biopsy samples, and the association of hamstrings composition and hamstrings muscle volume (using MRI) with knee flexor maximal and explosive strength. Thirty-one young men performed maximal (concentric, eccentric, isometric) and explosive (isometric) contractions...
October 13, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27737287/thigh-injuries-in-american-football
#16
REVIEW
Joseph D Lamplot, Matthew J Matava
Quadriceps and hamstring injuries occur frequently in football and are generally treated conservatively. While return to competition following hamstring strains is relatively quick, a high rate of injury recurrence highlights the importance of targeted rehabilitation and conditioning. This review describes the clinical manifestations of thigh-related soft-tissue injuries seen in football players. Two of these-muscle strains and contusions-are relatively common, while a third condition-the Morel-Lavallée lesion-is a rare, yet relevant injury...
September 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/27676859/interest-of-acl-grafts-compliance-assessments-in-the-first-2-months-after-surgery-adaptation-of-clinical-protocols-according-to-results
#17
Stéphane Nouveau
OBJECTIVE: The goal of this study was to assess ACL grafts compliance (equal inverse of stiffness) after surgery (D-1, 30, 90, 180, 1Y). MATERIAL/PATIENTS AND METHODS: Fifty-three patients (15F, 38M) were tested with GNRB laximeter (Genourob company, France) during 1 year. We analysed the slope of the curves during the first year of ligamentisation (It's a more objective parameter than just the laxity at one force): operated side/healthy side (O/H). It was the same surgeon and the same surgery (hamstrings tendon transplant) for all patients...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27639576/why-do-we-suffer-more-acl-injuries-in-the-cold-a-pilot-study-into-potential-risk-factors
#18
Robert Csapo, Ramona Folie, Simona Hosp, Michael Hasler, Werner Nachbauer
OBJECTIVES: This study aimed to investigate temperature-related changes in different neuro-muscular parameters, to elucidate the reasons for the increased likeliness of injuries of the anterior cruciate ligament under cold environmental conditions. DESIGN: Repeated measures study design. METHODS: To induce peripheral cooling of the knee joint and thigh muscles, ten healthy, female subjects underwent 30 min of exposure to a cold environment...
January 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/27632842/rehabilitation-after-hamstring-strain-injury-emphasizing-eccentric-strengthening-at-long-muscle-lengths-results-of-long-term-follow-up
#19
Timothy F Tyler, Brandon M Schmitt, Stephen J Nicholas, Malachy McHugh
CONTEXT: Hamstring strain injuries have a high recurrence rate. OBJECTIVE: To determine if a protocol emphasizing eccentric strength training with the hamstrings in a lengthened position resulted in a low recurrence rate. DESIGN: Longitudinal cohort study Setting: Sports medicine physical therapy clinic. PARTICIPANTS: 50 athletes with hamstring strain injury (age 36±16 yo; 30 men, 20 women; 3 G1, 43 G2, 4 G3; 25 recurrent injuries) followed a 3-phase rehabilitation protocol emphasizing eccentric strengthening with the hamstrings in a lengthened position...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27632836/ankle-position-during-the-nordic-curl-does-not-affect-muscle-activity-of-the-biceps-femoris-and-medial-gastrocnemius
#20
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
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