502 results match your criteria Hamstring Strain


Effect of Weekly Training Frequency With the Nordic Hamstring Exercise on Muscle-Strain Risk Factors in Football Players: A Randomized Trial.

Int J Sports Physiol Perform 2020 Jun 24:1-8. Epub 2020 Jun 24.

Purpose: To examine the differences between performing Nordic hamstring exercises once or twice a week on hamstring eccentric strength and other muscle-strain risk factors in high-level football players.

Methods: In this randomized trial, 32 football players (18-23 y old) completed an 8-week Nordic hamstring exercise training program in 1 of 2 experimental groups: group 1 (once a week; n = 15) and group 2 (twice a week; n = 17). Knee-flexor/extensor peak torques and biceps femoris long-head muscle architecture were assessed through isokinetic dynamometry and ultrasonography, respectively, before and after the training programs. Read More

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http://dx.doi.org/10.1123/ijspp.2018-0780DOI Listing

MAPPING TENDERNESS TO PALPATION PREDICTS RETURN TO PLAY FOLLOWING ACUTE HAMSTRING STRAIN.

Int J Sports Phys Ther 2020 May;15(3):421-428

MOTION PT, New York, NY.

Introduction/purpose: Currently there is little evidence supporting the use of objective tests, measures, or imaging to help predict time to return to sport (RTS) following a hamstring strain. The purpose of this study is to investigate the predictive value of tenderness to palpation (TTP) as measured by area and location following hamstring strain.

Study Design: Case Series. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7297001PMC

Non-uniform distribution of passive muscle stiffness within hamstring.

Scand J Med Sci Sports 2020 Jun 3. Epub 2020 Jun 3.

National Institute of Fitness and Sports in Kanoya, Kagoshima, Japan.

Limited information is available on whether stiffness is different within and between the constituents of the hamstring, that is, the biceps femoris long head (BFlh), semitendinosus (ST), and semimembranosus (SM). Therefore, understanding of hamstring injuries and stretching effect on hamstring stiffness is difficult. The present study primarily aimed to identify whether passive muscle stiffness differs between the BFlh, ST, and SM and between the proximal, middle, and distal sites within each muscle. Read More

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http://dx.doi.org/10.1111/sms.13732DOI Listing

Incidence of Lower Extremity Injury in the National Football League: 2015 to 2018.

Am J Sports Med 2020 Jun 2:363546520922547. Epub 2020 Jun 2.

Bellin Health Titletown Sports Medicine and Orthopedics, Green Bay, Wisconsin, USA.

Background: Lower extremity injuries are the most common injuries in professional sports and carry a high burden to players and teams in the National Football League (NFL). Injury prevention strategies can be refined by a foundational understanding of the occurrence and effect of these injuries on NFL players.

Purpose: To determine the incidence of specific lower extremity injuries sustained by NFL players across 4 NFL seasons. Read More

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http://dx.doi.org/10.1177/0363546520922547DOI Listing

Mechanisms of Hamstring Strain Injury: Interactions between Fatigue, Muscle Activation and Function.

Sports (Basel) 2020 May 18;8(5). Epub 2020 May 18.

UCAM Research Center for High Performance Sport, Catholic University San Antonio, 30830 Murcia, Spain.

Isolated injury to the long head of biceps femoris is the most common type of acute hamstring strain injury (HSI). However, the precise hamstring injury mechanism (i.e. Read More

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http://dx.doi.org/10.3390/sports8050065DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7281534PMC

Concurrent Anterior Cruciate Ligament and Medial Patellofemoral Ligament Reconstruction: A Case Report and Literature Review.

Cureus 2020 Apr 18;12(4):e7717. Epub 2020 Apr 18.

Orthopaedics, Ortho One Orthopaedic Speciality Centre, Coimbatore, IND.

Anterior cruciate ligament (ACL) insufficiency in combination with patellar instability are rare occurrences and are difficult to treat. Failure to address patellar instability in such cases may place excessive strain on ACL graft leading to graft rupture. We present three such cases treated by concurrent ACL and medial patellofemoral ligament (MPFL) reconstruction with hamstring tendon autografts. Read More

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http://dx.doi.org/10.7759/cureus.7717DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7234004PMC

CrossFit-related hip and groin injuries: a case series.

J Hip Preserv Surg 2020 Jan 30;7(1):109-115. Epub 2020 Jan 30.

Department of Orthopaedics, The Ohio State University, Sports Medicine Research Institute, 2835 Fred Taylor Drive, Columbus, OH 43202, USA.

To provide descriptive data on injury presentation and treatment and to identify risk factors for requiring surgical treatment for athletes presenting with CrossFit-related hip and groin injuries. CrossFit-related injuries ( = 982) were identified within a single hospital system from 2010 to 2017, with 83 (8.5% of total) identified hip or groin injuries. Read More

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http://dx.doi.org/10.1093/jhps/hnz072DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7195938PMC
January 2020

Strong and stringent hamstring strain science: trials and error!

Br J Sports Med 2020 Apr 23. Epub 2020 Apr 23.

Sports Orthopaedic Research Center-Copenhagen (SORC-C), Arthroscopic Center, Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Denmark, Amager-Hvidovre Hospital, Hvidovre, Copenhagen, Denmark.

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http://dx.doi.org/10.1136/bjsports-2020-102213DOI Listing

Recalibrating the risk of hamstring strain injury (HSI) - A 2020 systematic review and meta-analysis of risk factors for index and recurrent HSI in sport.

Br J Sports Med 2020 Apr 16. Epub 2020 Apr 16.

La Trobe Sport and Exercise Medicine Research Centre, La Trobe University, Melbourne, Victoria, Australia.

Objective: To systematically review risk factors for hamstring strain injury (HSI).

Design: Systematic review update.

Data Sources: Database searches: (1) inception to 2011 (original), and (2) 2011 to December 2018 (update). Read More

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http://dx.doi.org/10.1136/bjsports-2019-100983DOI Listing

AN EXPLORATORY CASE SERIES ANALYSIS OF THE USE OF PRIMAL REFLEX RELEASE TECHNIQUE™ TO IMPROVE SIGNS AND SYMPTOMS OF HAMSTRING STRAIN.

Int J Sports Phys Ther 2020 Apr;15(2):263-273

California State University Dominguez Hills in Carson, California, USA.

Background/purpose: Hamstring strain (HS), a common condition found among the injured physically active population, is often treated with rest, stretching, and modalities. Primal Reflex Release Technique™ (PRRT™) is a manual therapy technique used to treat pain caused by over-stimulation of the body's primal reflexes. The purpose of this case series was to explore the immediate effects of PRRT™ for treating hamstring strains. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7134355PMC

Treatment of patellar and hamstring tendinopathy with platelet-rich plasma in varsity collegiate athletes: A case series.

J Orthop 2020 Mar-Apr;18:91-94. Epub 2019 Oct 31.

Department of Orthopaedic Surgery, Northwestern University, 259 East Erie Street, Chicago, IL, 60611, USA.

Patellar and hamstring tendinopathy are common injuries among elite athletes. Platelet-rich plasma (PRP) has emerged as a promising new therapy for accelerating healing and shortening recovery in patients with these conditions. We present 15 cases of PRP injection used for either patellar or hamstring tendinopathy in varsity collegiate athletes at a single institution. Read More

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http://dx.doi.org/10.1016/j.jor.2019.10.007DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7068016PMC
October 2019

Eccentric knee flexor strength of professional football players with and without hamstring injury in the prior season.

Eur J Sport Sci 2020 Mar 26:1-9. Epub 2020 Mar 26.

Graduate Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre (UFCSPA), Porto Alegre, Brazil.

Both injury history and eccentric knee flexor strength have been associated with risk of football players sustaining hamstring strain injury (HSI). However, it remains unclear whether football players who sustained HSIs in the prior season present persistent eccentric strength deficits. Therefore, the aim of the present study was to verify the eccentric knee flexor strength of professional male football players with and without history of HSI in the prior season. Read More

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http://dx.doi.org/10.1080/17461391.2020.1743766DOI Listing

Voluntary Activation and Reflex Responses following Hamstring Strain Injury.

Med Sci Sports Exerc 2020 Feb 25. Epub 2020 Feb 25.

School of Exercise and Nutrition Sciences and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.

Introduction: There is a lack of definitive evidence supporting deficits in voluntary activation in participants with prior hamstring injury, moreover it remains unknown if spinal mechanisms contribute to suspected deficits.

Purpose: To determine the effect of prior hamstring strain injury on knee flexor concentric and eccentric strength, voluntary activation, surface electromyographic activity (sEMG), stretch and tendon reflex amplitudes.

Methods: Twenty-five participants were recruited, twelve with a history of unilateral hamstring strain injury of at least moderate severity. Read More

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http://dx.doi.org/10.1249/MSS.0000000000002327DOI Listing
February 2020

The Relationship between Vitamin D Levels, Injury and Muscle Function in Adolescent Dancers.

Int J Sports Med 2020 Jun 14;41(6):360-364. Epub 2020 Feb 14.

Laboratory of Musculoskeletal Research, Universidade Estadual de Goiás, Anapolis, Brazil.

Vitamin D has been shown to benefit a diverse range of health functions including muscle function. The aim of the present study was to identify serum 25(OH)D3 levels in a sample of adolescent dancers and compare them to muscle function and injury incidence. We incorporated a cross-sectional design to study 49 pre-professional male and female dancers (17±4. Read More

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http://dx.doi.org/10.1055/a-1087-2130DOI Listing

Bilateral differences in hamstring coordination in previously injured elite athletes.

J Appl Physiol (1985) 2020 Mar 6;128(3):688-697. Epub 2020 Feb 6.

Laboratory Sport, Expertise and Performance (EA 7370), French Institute of Sport, Paris, France.

Hamstring strain injuries (HSIs) involve tissue disruption and pain, which can trigger long-term adaptations of muscle coordination. However, little is known about the effect of previous HSIs on muscle coordination and in particular, after the completion of rehabilitation and in the absence of symptoms. This study aimed to determine if elite athletes with a prior unilateral HSI have bilateral differences in coordination between the hamstring muscle heads after returning to sport. Read More

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http://dx.doi.org/10.1152/japplphysiol.00411.2019DOI Listing

Fifteen-week window for recurrent muscle strains in football: a prospective cohort of 3600 muscle strains over 23 years in professional Australian rules football.

Br J Sports Med 2020 Feb 5. Epub 2020 Feb 5.

School of Public Health, University of Sydney Medical School, Sydney, New South Wales, Australia.

Objectives: To determine the rates of muscle strain injury recurrence over time after return to play in Australian football and to quantify risk factors.

Methods: We analysed Australian Football League player data from 1992 to 2014 for rates of the four major muscle strain injury types (hamstring, quadriceps, calf and groin) diagnosed by team health professionals. Covariates for analysis were: recent history (≤8 weeks) of each of the four muscle strains; non-recent history (>8 weeks) of each; history of hip, knee anterior cruciate ligament, knee cartilage, ankle sprain, concussion or lumbar injury; age; indigenous race; match level and whether a substitute rule was in place. Read More

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http://dx.doi.org/10.1136/bjsports-2019-100755DOI Listing
February 2020

Pain-Free Versus Pain-Threshold Rehabilitation Following Acute Hamstring Strain Injury: A Randomized Controlled Trial.

J Orthop Sports Phys Ther 2020 Feb;50(2):91-103

Objective: The primary aim was to compare time from acute hamstring strain injury (HSI) to return-to-play (RTP) clearance following a standardized rehabilitation protocol performed within either pain-free or pain-threshold limits. Secondary aims were to compare isometric knee flexor strength, biceps femoris long head (BFLH) fascicle length, fear of movement, and reinjury occurrence at the 6-month follow-up between pain-free and pain-threshold groups.

Design: Randomized controlled trial. Read More

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http://dx.doi.org/10.2519/jospt.2020.8895DOI Listing
February 2020

Effects of low-level laser therapy on hamstring strain injury rehabilitation: A randomized controlled trial.

Phys Ther Sport 2020 Mar 10;42:124-130. Epub 2020 Jan 10.

Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil. Electronic address:

Objectives: To evaluate the effects of low-level laser therapy (LLLT) on functional rehabilitation following hamstring strain injury (HSI) in amateur athletes treated with an exercise-based rehabilitation program.

Design: Randomized controlled trial.

Methods: Male athletes (18-40 years old) who sustained HSI were randomized in LLLT or placebo groups. Read More

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http://dx.doi.org/10.1016/j.ptsp.2020.01.006DOI Listing

Rapid hamstrings to quadriceps ratio at long muscle lengths in professional football players with previous hamstring strain injury.

Eur J Sport Sci 2020 Jan 21:1-9. Epub 2020 Jan 21.

Faculty of Human Kinetics, Neuromuscular Research Lab, University of Lisbon, Lisbon, Portugal.

Hamstring strain injuries (HSI) are the most common injury in male professional football and are potentially a primary risk factor to re-injury. Although the isokinetic strength ratios have often been used to identify strength imbalances that can augment the risk of injury in football players, the rate of torque development hamstring to quadriceps ratio (RTD H/Q) has rarely been considered in previous reports. Furthermore, little consideration has been given to selective hamstring lengths (30° of knee flexion) and its influence on torque production. Read More

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http://dx.doi.org/10.1080/17461391.2020.1714741DOI Listing
January 2020

Improvements in Match-Related Physical Performance of Professional Soccer Players After the Application of an on-Field Training Program for Hamstring Injury Rehabilitation.

J Sport Rehabil 2019 Dec 22. Epub 2019 Dec 22.

Context: Although there are multiple, validated return-to-play programs following hamstring strain injuries, no studies have evaluated their changes in match performance parameters.

Objectives: The aim of this study was twofold as follows: (1) to determine the changes in match-based physical performance parameters in professional soccer players before and after sustaining a hamstring strain injury and undergoing a soccer-specific rehabilitation program and (2) to observe the progress of these performance parameters 6 to 10 weeks after the player returned from injury.

Design: Prospective, quasi-experimental longitudinal study. Read More

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http://dx.doi.org/10.1123/jsr.2019-0033DOI Listing
December 2019

Anteromedial Portal Double-Bundle Anterior Cruciate Ligament Reconstruction Yields Similar Outcomes to Non-AMP Femoral Drilling Double-Bundle Techniques: A Systematic Review of Comparative Studies.

Orthop J Sports Med 2019 Dec 11;7(12):2325967119888140. Epub 2019 Dec 11.

Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada.

Background: Biomechanical studies have shown double-bundle (DB) anterior cruciate ligament reconstruction (ACLR) to have increased anterior and rotational stability as compared with single-bundle ACLR. Various techniques exist to drill the femoral tunnel, such as anteromedial portal (AMP), outside-in (OI), and transtibial (TT) drilling. However, it is unclear whether one drilling technique is superior to others when a DB graft is used. Read More

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http://dx.doi.org/10.1177/2325967119888140DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6906356PMC
December 2019

High-velocity elastic-band training improves hamstring muscle activation and strength in basketball players.

J Sports Med Phys Fitness 2020 Mar 5;60(3):380-387. Epub 2019 Dec 5.

Lithuanian Sports University, Kaunas, Lithuania.

Background: The aim of this study was use surface EMG activity to assess changes in co-activation of knee flexors and extensors muscle groups during elastic-band exercise after 5 weeks of high-velocity elastic-band training in basketball players.

Methods: College male basketball players (N.=18) were randomly divided into one of two groups: 1) the elastic-band training group performed low-load and high-velocity - lying prone - hamstring curls training three times per week; 2) the control group did not do any training. Read More

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http://dx.doi.org/10.23736/S0022-4707.19.10244-7DOI Listing

ACCURACY OF THE FUNCTIONAL MOVEMENT SCREEN (FMS) ACTIVE STRAIGHT LEG RAISE TEST TO EVALUATE HAMSTRING FLEXIBILITY IN SOCCER PLAYERS.

Int J Sports Phys Ther 2019 Dec;14(6):877-884

Federal University of Health Sciences of Porto Alegre, Rio Grande do Sul, Brazil.

Background: Poor flexibility is considered a risk factor for the hamstring strain injury, and the active straight leg raise (ASLR) test proposed as a part of the Functional Movement Screen™ (FMS™) has been used to assess athletes hamstring flexibility. However, the accuracy of this screening test remains undescribed.

Purpose: To examine the accuracy of the FMS™ ASLR test for assessment of hamstring flexibility in soccer players. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6878869PMC
December 2019

Hamstring muscle-tendon unit lengthening and activation in instep and cut-off kicking.

J Biomech 2020 Jan 2;99:109482. Epub 2019 Nov 2.

Center for Human Movement Science, Division of Physical Therapy, School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. Electronic address:

Hamstring muscle strain injury is one of the most common injuries in sports involving sprinting and kicking. Studies examining hamstring kinematics and activations are rich for sprinting but lacking for kicking. The purpose of this study was to examine kinematics and activations of hamstring muscles in instep and cut-off kicking tasks frequently performed in soccer. Read More

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http://dx.doi.org/10.1016/j.jbiomech.2019.109482DOI Listing
January 2020

Individual Region- and Muscle-specific Hamstring Activity at Different Running Speeds.

Med Sci Sports Exerc 2019 11;51(11):2274-2285

Neuromuscular Research Center, Faculty of Sport and Health Sciences, University of Jyväskylä, Jyvaskyla, FINLAND.

Introduction: Hamstring strain injuries typically occur in the proximal biceps femoris long head (BFlh) at high running speeds. Strain magnitude seems to be the primary determinant of strain injury, and may be regulated by muscle activation. In running, BFlh strain is largest in the proximal region, especially at high speeds. Read More

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http://Insights.ovid.com/crossref?an=00005768-201911000-0001
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http://dx.doi.org/10.1249/MSS.0000000000002060DOI Listing
November 2019
3 Reads

A novel hamstring strain injury prevention system: post-match strength testing for secondary prevention in football.

Br J Sports Med 2020 May 19;54(9):498-499. Epub 2019 Oct 19.

Physiotherapy, La Trobe University, Mebourne, Victoria, Australia.

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http://dx.doi.org/10.1136/bjsports-2019-100707DOI Listing
May 2020
1 Read

Effects of flexibility and strength interventions on optimal lengths of hamstring muscle-tendon units.

J Sci Med Sport 2020 Feb 7;23(2):200-205. Epub 2019 Oct 7.

Center for Human Movement Science, The University of North Carolina at Chapel Hill, USA. Electronic address:

Objectives: The aim of the present study was to determine the effects of altering both hamstring flexibility and strength on hamstring optimal lengths.

Design: Controlled laboratory study.

Methods: A total of 20 male and 20 female college students (aged 18-24 years) participated in this study and were randomly assigned to either a flexibility intervention group or a strength intervention group. Read More

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http://dx.doi.org/10.1016/j.jsams.2019.09.017DOI Listing
February 2020
1 Read

Hamstring muscles' function deficit during overground sprinting in track and field athletes with a history of strain injury.

J Sports Sci 2019 Dec 6;37(23):2744-2750. Epub 2019 Sep 6.

Faculty of Sport Sciences, Waseda University , Saitama , Japan.

In this study, we aimed to clarify the characteristics of neuromuscular function, kinetics, and kinematics of the lower extremity during sprinting in track and field athletes with a history of strain injury. Ten male college sprinters with a history of unilateral hamstring injury performed maximum effort sprint on an athletic track. The electromyographic (EMG) activity of the long head of the biceps femoris (BFlh) and gluteus maximus (Gmax) muscles and three-dimensional kinematic data were recorded. Read More

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http://dx.doi.org/10.1080/02640414.2019.1664030DOI Listing
December 2019
1 Read

Denervation Edema of Hamstring Muscles Following Acute Strain Injury.

J Orthop Sports Phys Ther 2019 10;49(10):761

A 20-year-old male American football player sustained a first-time, left hamstring strain injury (HSI) during competition. Magnetic resonance imaging indicated involvement of the biceps femoris long head (BFLH) and semitendinosus (ST). Following 3 weeks of rehabilitation, the athlete returned to competition without further incident. Read More

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http://dx.doi.org/10.2519/jospt.2019.8598DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7045722PMC
October 2019
2 Reads

Hamstring-to-Quadriceps Ratio in Female Athletes with a Previous Hamstring Injury, Anterior Cruciate Ligament Reconstruction, and Controls.

Sports (Basel) 2019 Sep 28;7(10). Epub 2019 Sep 28.

Laboratory of Neuromechanics, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, 62100 Thessaloniki, Greece.

Muscle strength imbalances around the knee are often observed in athletes after anterior cruciate ligament (ACL) surgery and hamstring muscle injury. This study examined three hamstrings-to-quadriceps (H:Q) strength ratio types (conventional, functional, and mixed) in thirteen female athletes with a history of hamstring injury, fourteen basketball players following ACL reconstruction and 34 controls. The conventional (concentric H:Q) peak torque ratio was evaluated at 120°·s and 240°·s. Read More

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http://dx.doi.org/10.3390/sports7100214DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835705PMC
September 2019
1 Read

The Effect of Nordic Hamstring Exercise Intervention Volume on Eccentric Strength and Muscle Architecture Adaptations: A Systematic Review and Meta-analyses.

Sports Med 2020 Jan;50(1):83-99

Human Performance Laboratory, University of Salford, Greater Manchester, UK.

Background: Although performance of the Nordic hamstring exercise (NHE) has been shown to elicit adaptations that may reduce hamstring strain injury (HSI) risk and occurrence, compliance in NHE interventions in professional soccer teams is low despite a high occurrence of HSI in soccer. A possible reason for low compliance is the high dosages prescribed within the recommended interventions. The aim of this review was to investigate the effect of NHE-training volume on eccentric hamstring strength and biceps femoris fascicle length adaptations. Read More

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http://link.springer.com/10.1007/s40279-019-01178-7
Publisher Site
http://dx.doi.org/10.1007/s40279-019-01178-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6942028PMC
January 2020
2 Reads

Hamstring Injury Trends in Major and Minor League Baseball: Epidemiological Findings From the Major League Baseball Health and Injury Tracking System.

Orthop J Sports Med 2019 Jul 30;7(7):2325967119861064. Epub 2019 Jul 30.

Columbia University New York Presbyterian Hospital, New York, New York, USA.

Background: Hamstring strains are the most common injury for professional baseball players and can result in significant time on the disabled list. To date, no study has reported the current trends in hamstring strains in professional baseball.

Hypothesis: Professional baseball players would have an increased incidence of hamstring strains from 2011 through 2016. Read More

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http://dx.doi.org/10.1177/2325967119861064DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6685122PMC
July 2019
3 Reads

Portal Placement and Biomechanical Performance of Endoscopic Proximal Hamstring Repair.

Am J Sports Med 2019 10 14;47(12):2985-2992. Epub 2019 Aug 14.

American Sports Medicine Institute, Birmingham, Alabama, USA.

Background: Proximal hamstring tendon avulsions are debilitating and commonly cause pain, weakness, and functional limitations. Open surgical repair has been the standard, but improved endoscopic techniques have enabled proximal hamstring fixation with decreased risk of infection and numbness, without the morbidity of a large incision.

Purpose/hypothesis: The purpose was to (1) describe pertinent anatomy surrounding the proximal hamstring origin in relation to 4 endoscopic portal sites and (2) test for biomechanical differences between open and endoscopic repair. Read More

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http://dx.doi.org/10.1177/0363546519866453DOI Listing
October 2019
3 Reads

Ultrasound-derived Biceps Femoris Long Head Fascicle Length: Extrapolation Pitfalls.

Med Sci Sports Exerc 2020 01;52(1):233-243

Sports Medical Research Group, Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Zurich, SWITZERLAND.

Purpose: This study aimed to compare biceps femoris long head (BFlh) fascicle length (Lf) obtained with different ultrasound-based approaches: 1) single ultrasound images and linear Lf extrapolation, 2) single ultrasound images and one of two different trigonometric equations (termed equations A and B), and 3) extended field of view (EFOV) ultrasound images.

Methods: Thirty-seven elite alpine skiers (21.7 ± 2. Read More

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http://dx.doi.org/10.1249/MSS.0000000000002123DOI Listing
January 2020
3 Reads

Differential movement of the sciatic nerve and hamstrings during the straight leg raise with ankle dorsiflexion: Implications for diagnosis of neural aspect to hamstring disorders.

Musculoskelet Sci Pract 2019 10 27;43:91-95. Epub 2019 Jul 27.

Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain.

Introduction: In hamstrings injuries, sciatic nerve and muscle disorders can coexist. Therefore, differential diagnosis to include or exclude nerve involvement is an important aspect of evaluation. The objective of this paper is to investigate the mechanical behaviour of the sciatic nerve and biceps femoris muscle in the proximal thigh with the ankle dorsiflexion manoeuvre at different degrees of hip flexion during the straight leg raise in cadavers. Read More

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http://dx.doi.org/10.1016/j.msksp.2019.07.011DOI Listing
October 2019
2 Reads

The effects of sprint training and the Nordic hamstring exercise on eccentric hamstring strength and sprint performance in adolescent athletes.

J Sports Med Phys Fitness 2019 Jul;59(7):1119-1125

Maribyrnong Sports Academy, Melbourne, Australia.

Background: Hamstring strain injuries (HSI) are among the most common injuries in field-based team sports with a high-speed running component. The implementation of the Nordic hamstring exercise (NHE) is a well-documented method of improving eccentric hamstring strength to mitigate the risk of HSI occurrence. Sprint training is specific to the injury mechanism and is thought to activate the hamstrings through maximal eccentric contractions. Read More

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http://dx.doi.org/10.23736/S0022-4707.18.08703-0DOI Listing
July 2019
2 Reads

Neuromuscular changes in football players with previous hamstring injury.

Clin Biomech (Bristol, Avon) 2019 10 13;69:115-119. Epub 2019 Jul 13.

School of Health Sciences and Institute of Biomedicine - iBiMED, University of Aveiro, Aveiro, Portugal.

Background: Impact of prior injury on myoelectrical activity of the hamstrings during isokinetic eccentric contractions has received increased literature attention. This cross-sectional study aimed to assess neuromuscular adaptations, namely proprioception, core stability, muscle strength, extensibility and activity, in football players with history of hamstring strain injury.

Methods: Seventeen players, 10 with history of hamstring injury and 7 without prior injury underwent isokinetic strength testing, eccentric knee extension at 30 and 120°/s. Read More

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http://dx.doi.org/10.1016/j.clinbiomech.2019.07.010DOI Listing
October 2019
3 Reads

Biceps femoris long head muscle fascicle length does not differ between sexes.

J Sports Sci 2019 Nov 14;37(21):2452-2458. Epub 2019 Jul 14.

School of Sport, Exercise, and Health Sciences, Loughborough University , Leicestershire , UK.

Hamstring strain injury (HSI) rates are higher for males vs. females. This cross-sectional study investigated if inherent differences in biceps femoris long head (BF) fascicle length (L) exist between recreationally active males and females (i. Read More

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http://dx.doi.org/10.1080/02640414.2019.1641016DOI Listing
November 2019
3 Reads

Strain behavior of native and reconstructed medial patellofemoral ligaments during dynamic knee flexion - a cadaveric study.

J Exp Orthop 2019 Jul 3;6(1):31. Epub 2019 Jul 3.

Department of Orthopaedic Surgery, Singapore General Hospital, 20 College Road, Singapore, 169856, Singapore.

Background: Surgical reconstruction of the Medial Patello-Femoral Ligament (MPFL) has been recognized as an effective treatment for patients with instability despite conservative treatment. The purpose of this cadaveric study is to compare the strain patterns within the native and reconstructed single and double-bundle MPFL. This will help ascertain if the native biomechanics are restored with the reconstructions. Read More

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http://dx.doi.org/10.1186/s40634-019-0195-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6609927PMC
July 2019
2 Reads

Pain-Free Versus Pain-Threshold Rehabilitation Following Acute Hamstring Strain Injury: A Randomized Controlled Trial.

J Orthop Sports Phys Ther 2019 Jun 28:1-35. Epub 2019 Jun 28.

School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia.

Study Design: Randomized controlled trial.

Background: Conventional guidelines recommend hamstring strain injury (HSI) rehabilitation should only be performed and progressed in complete absence of pain, despite lack of comparison to alternative approaches.

Objectives: The primary aim of this study was to compare the number of days from acute HSI to return to play (RTP) clearance following a standardised rehabilitation protocol performed within either pain-free or pain-threshold limits. Read More

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http://dx.doi.org/10.2519/jospt.2019.8895DOI Listing
June 2019
5 Reads

Muscle-strain injury exudate favors acute tissue healing and prolonged connective tissue formation in humans.

FASEB J 2019 09 18;33(9):10369-10382. Epub 2019 Jun 18.

Department of Orthopedic Surgery M, Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark.

Traumatic strain injury in skeletal muscle is often associated with fluid accumulation at the site of rupture, but the role of this injury exudate (EX) in cellular responses and healing is unknown. We aimed to characterize the EX sampled from human hamstring or calf muscles following a strain injury ( = 12). The cytokine and growth-factor profile, gene expression, and transcriptome analysis of EX-derived cells were compared with blood taken simultaneously from the same individuals. Read More

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https://www.fasebj.org/doi/10.1096/fj.201900542R
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http://dx.doi.org/10.1096/fj.201900542RDOI Listing
September 2019
8 Reads

Hamstring rate of torque development is more affected than maximal voluntary contraction after a professional soccer match.

Eur J Sport Sci 2019 Nov 1;19(10):1336-1341. Epub 2019 Jun 1.

Exercise Research Laboratory, Physical Education, Physiotherapy, and Dance School, Universidade Federal do Rio Grande do Sul , Porto Alegre , Brazil.

Match-induced fatigue of knee muscle strength and agonist-antagonist strength-ratios may affect both performance and risk of injury in soccer players. Once explosive tasks are imperative in soccer as well as hamstring strain injuries occur during high-velocity moments, rapid force capacity of this muscle group is especially important. This study evaluated the effect of match-induced fatigue on knee muscle strength and strength-ratio parameters after a single professional soccer match. Read More

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http://dx.doi.org/10.1080/17461391.2019.1620863DOI Listing
November 2019
10 Reads

Chronic ischial tuberosity avulsion nonunion fracture treated with a platelet-rich plasma injection as a bone graft.

Regen Med 2019 05 9;14(5):353-358. Epub 2019 May 9.

University of Tennessee Medical Center, Knoxville, TN 37920, USA,.

We present a case of an 18-year-old with a 2-year history of buttock pain who failed extensive treatment for a perceived hamstring strain. Upon evaluation, he was diagnosed with an ischial tuberosity nonunion avulsion fracture. The patient underwent bone grafting via an ultrasound guided leukocyte rich platelet-rich plasma injection followed by the use of a bone stimulator to enhance the bone healing. Read More

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http://dx.doi.org/10.2217/rme-2018-0071DOI Listing
May 2019
9 Reads

Late swing or early stance? A narrative review of hamstring injury mechanisms during high-speed running.

Scand J Med Sci Sports 2019 Aug 22;29(8):1083-1091. Epub 2019 May 22.

Faculty of Health, University of Canberra Research Institute for Sport and Exercise, University of Canberra, Canberra, Australian Capital Territory, Australia.

Hamstring injuries are highly prevalent in many running-based sports, and predominantly affect the long head of biceps femoris. Re-injury rates are also high and together lead to considerable time lost from sport. However, the mechanisms for hamstring injury during high-speed running are still not fully understood. Read More

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http://dx.doi.org/10.1111/sms.13437DOI Listing
August 2019
9 Reads

Measurement of the cross-sectional area of the hamstring muscles during initial and stretch positions with gravity magnetic resonance imaging.

J Phys Ther Sci 2019 Mar 19;31(3):267-272. Epub 2019 Mar 19.

Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Japan.

[Purpose] We aimed to investigate the change rate in the cross-sectional area of each hamstring component to evaluate muscle extensibility and to contribute to the studies on hamstring strain prevention. [Participants and Methods] Fifteen healthy young males volunteered to participate in this study. They performed a knee extension test. Read More

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http://dx.doi.org/10.1589/jpts.31.267DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6428649PMC
March 2019
8 Reads

Impact of Hip Flexion Angle on Unilateral and Bilateral Nordic Hamstring Exercise Torque and High-Density Electromyography Activity.

J Orthop Sports Phys Ther 2019 08 26;49(8):584-592. Epub 2019 Mar 26.

Background: In the bilateral Nordic hamstring exercise (NHE), hamstrings operate at relatively short lengths, which may limit the efficacy of the NHE in hamstring injury prevention.

Objectives: To examine knee flexion torque and biceps femoris long head (BFLH) and semitendinosus (ST) high-density electromyography (EMG) activity during the unilateral and bilateral NHE, performed with either neutral (NHE0) or 90°-flexed (NHE90) hips.

Methods: In this laboratory study, exercises were performed on a novel device at the eccentric 1-repetition maximum load defined for 90° to 15° of knee range of motion. Read More

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http://dx.doi.org/10.2519/jospt.2019.8801DOI Listing
August 2019
11 Reads

A Preventive Model for Hamstring Injuries in Professional Soccer: Learning Algorithms.

Int J Sports Med 2019 May 14;40(5):344-353. Epub 2019 Mar 14.

The SPORT Center, Division of Sports Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.

Hamstring strain injury (HSI) is one of the most prevalent and severe injury in professional soccer. The purpose was to analyze and compare the predictive ability of a range of machine learning techniques to select the best performing injury risk factor model to identify professional soccer players at high risk of HSIs. A total of 96 male professional soccer players underwent a pre-season screening evaluation that included a large number of individual, psychological and neuromuscular measurements. Read More

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http://dx.doi.org/10.1055/a-0826-1955DOI Listing
May 2019
8 Reads

The influence of tibial slope on anterior cruciate ligament graft failure risk is dependent on graft positioning.

J Orthop Surg (Hong Kong) 2019 Jan-Apr;27(1):2309499019834674

2 Middlemore Hospital, Auckland, New Zealand.

Background: Increased lateral tibial posterior slope (LTPS) is associated with higher anterior cruciate ligament (ACL) reconstruction (ACLR) failure rate. Transportal central femoral footprint ACLR is associated with higher failure rate compared to transtibial high anteromedial footprint ACLR due to graft anisometry. The purpose of this study was to investigate whether the influence of tibial slope on ACL graft failure risk is dependent on graft positioning. Read More

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http://dx.doi.org/10.1177/2309499019834674DOI Listing
March 2020
8 Reads

Chronic Effects of Static and Dynamic Stretching on Hamstrings Eccentric Strength and Functional Performance: A Randomized Controlled Trial.

J Strength Cond Res 2020 Jul;34(7):2031-2039

Neuromuscular Performance Analysis Laboratory, Department of Physical Therapy, Federal University of Rio Grande do Norte, Natal, Brazil.

Barbosa, GM, Trajano, GS, Dantas, GAF, Silva, BR, and Vieira, WHB. Chronic effects of static and dynamic stretching on hamstrings eccentric strength and functional performance: A randomized controlled trial. J Strength Cond Res 34(7): 2031-2039, 2020-The purpose of this study was to investigate the effect of static or dynamic stretching training program on hamstrings eccentric peak torque and functional performance. Read More

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http://dx.doi.org/10.1519/JSC.0000000000003080DOI Listing
July 2020
65 Reads

Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio.

Sports (Basel) 2019 Feb 15;7(2). Epub 2019 Feb 15.

Laboratory of Neuromechanics, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece.

The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s and 240 °·s from hip flexion angles of 90°, 60°, and 120°. The conventional (concentric to concentric), functional (eccentric to concentric) and mixed (eccentric at 30 °·s to concentric torque at 240 °·s) H: Q torque ratios and the electromyographic activity from the rectus femoris and biceps femoris were analyzed. Read More

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http://dx.doi.org/10.3390/sports7020043DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409775PMC
February 2019
9 Reads