977 results match your criteria: "Hamstring Strain"
Progressive and Asymmetrical Deadlift Loads Captured by Wearable Motion Tape Sensors.
Sensors (Basel)
December 2024
Active, Responsive, Multifunctional, and Ordered-Materials Research (ARMOR) Laboratory, Department of Structural Engineering, University of California San Diego, La Jolla, CA 92093, USA.
Weight training is widely adopted and highly effective for enhancing both muscular strength and endurance. A popular weightlifting exercise is the deadlift, which targets multiple muscle groups including the lower back, glutes, and hamstrings. However, incorrect technique (i.
View Article and Find Full Text PDFHamstring activation deficits during Double-Leg Jump-Landing tasks in athletes with hamstring strain injuries using EMG Time-Frequency analysis.
J Biomech
December 2024
Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Physical Therapy Center, National Cheng Kung University Hospital, Tainan, Taiwan. Electronic address:
This study aimed to investigate the hamstring activation in athletes with hamstring strain injuries in vertical jump tasks using an EMG time-frequency analysis. Fifteen injured athletes and 15 matched controls were recruited. The EMG signals of the lateral hamstring (LH) and medial hamstring (MH) were assessed during countermovement, squat, and drop vertical jump tasks.
View Article and Find Full Text PDFThe development of hamstring strength over the course of a simulated soccer match.
PLoS One
December 2024
Biomechanics in Sports, Technical University of Munich, Munich, Bavaria, Germany.
Hamstring strain injuries are a prevalent burden in soccer. Low strength, muscle fatigue, and inter-limb differences in hamstring strength are associated with hamstring injury risk. Previous research shows increased hamstring injury incidence in soccer at the end of each half or the end of the match, respectively.
View Article and Find Full Text PDFReturn-to-play criteria following a hamstring injury in professional football: a scoping review.
Res Sports Med
December 2024
School of Health and Sports Sciences, University of Suffolk, Ipswich, UK.
The present scoping review aims to describe the available criteria to determine Return-To-Play (RTP), propose methodological considerations and new research questions, and provide information to help practitioners in professional football make informed decisions regarding RTP following a hamstring strain injury (HSI) in professional male football. The following electronic databases were searched: PubMed, MEDLINE, web of science and SPORTDiscus using keywords related to HSI in elite football. All types of studies in English reporting at least one RTP criterion for professional football players who sustained an HSI were included.
View Article and Find Full Text PDFRisk and Prognosis of Hamstring Injuries in the National Football League: A 12-Year Review.
Orthop J Sports Med
December 2024
Department of Orthopaedic Surgery, Nassau University Medical Center, East Meadow, New York, USA.
Background: Hamstring injuries can have a significant burden on a professional football player's career and performance. One in 4 players will suffer a lower extremity strain in their career, with the hamstring being the most common. These injuries are often fraught with extended periods of recovery and reinjury rates varying between 16% and 38%.
View Article and Find Full Text PDFInfluence of Hamstring Injuries and Vision on Posterior Chain Muscle Activation during Challenging Single-Limb Balance Control among Athletes with Hamstring Strain Injuries.
J Musculoskelet Neuronal Interact
December 2024
Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
Article Synopsis
- - The study examined how hamstring strain injuries (HSI) and vision affect muscle recruitment and balance in athletes, comparing 14 athletes with HSI to 14 healthy athletes while they performed balance tasks.
- - Results showed that athletes with HSI had significantly lower activation in their hamstring muscles during balance tasks, leading to increased body sway and reduced stability compared to healthy controls.
- - The findings suggest that the ongoing muscle activation deficits in athletes with HSI could negatively influence their balance, highlighting the need for targeted balance training in rehabilitation programs.
Platelet-Poor Plasma for the Treatment of Acute Hamstring Muscle Injuries in Collegiate Football Athletes: A Cohort Study.
Clin J Sport Med
November 2024
Carver College of Medicine, University of Iowa, Iowa City, Iowa.
Article Synopsis
- A cohort study evaluated the effectiveness of platelet-poor plasma (PPP) injections for treating acute hamstring strains in male collegiate football players aged around 20 years.
- The study included 20 patients who received PPP injections and found that they returned to full sports participation after an average of 29.4 days, with pain improvement noticeable as early as two weeks post-injection.
- The results suggest PPP is a safe treatment option that may help speed up recovery from hamstring injuries, with no recurrent injuries reported within a year.
Enhancing Sprint Performance and Biomechanics in Semiprofessional Football Players Through Repeated-Sprint Training.
J Appl Biomech
November 2024
Centre for Sport Studies, Rey Juan Carlos University, Madrid, Spain.
Article Synopsis
- - Repeated-sprint ability is crucial for football performance, with hamstring injuries commonly occurring during sprints when players are fatigued.
- - A study with 14 semiprofessional soccer players implemented 8 weeks of repeated-sprint training (RST), which involved multiple sets of short sprints with brief recovery periods.
- - Results showed significant improvements in sprint times and kinematic patterns, indicating that RST enhances sprint performance and promotes safer running mechanics, especially when players are fatigued.
Multiscale hamstring muscle adaptations following 9 weeks of eccentric training.
J Sport Health Sci
October 2024
Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA; Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA. Electronic address:
Article Synopsis
- Eccentric training via Nordic hamstring exercises (NHE) is effective in preventing hamstring strains by promoting changes in muscle structure, specifically increasing muscle fascicle length and adding sarcomeres in series within the muscle fibers.
- In a study with 12 participants, after 9 weeks of NHE training, the biceps femoris long-head (BFlh) showed significant improvements, including a 19% and 33% increase in fascicle length in the central and distal regions, respectively, along with a 40% increase in knee flexion strength.
- Following a 3-week period of no training (detraining), muscle adaptations such as fascicle length
The validity and reliability of a Japanese version of the web-based hamstring outcome score.
Sci Rep
October 2024
Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
Article Synopsis
- * A total of 233 athletes completed the questionnaire, with added questions for content validity; results showed high response rates and strong internal consistency (Cronbach's α values between 0.72 and 0.96).
- * Findings indicated that athletes with a previous hamstring injury had a significantly lower HaOS compared to healthy athletes, confirming the questionnaire's effectiveness for monitoring hamstring conditions in Japan.
Alterations in hamstring properties of athletes with hamstring strain injuries can impact jump-landing performance.
J Sports Med Phys Fitness
October 2024
College of Medicine, Department of Physical Therapy, National Cheng Kung University, Tainan, Taiwan (ROC) -
Article Synopsis
- A study looked at how hamstring injuries affect athletes' jumping and landing abilities.
- Researchers tested 16 athletes with hamstring strains and 16 healthy ones to compare their muscle function and performance.
- Injured athletes had less strength and flexibility but higher stiffness, leading to poorer jumping and landing performance, showing that hamstring injuries can hurt sports skills.
Potential financial loss and risk factors for hamstring muscle injuries in elite male Brazilian soccer players: a season-long prospective cohort pilot study.
Front Sports Act Living
September 2024
Post Graduate Program in Health Sciences, Faculdade Ciências Médicas de Minas Gerais, Belo Horizonte, Brazil.
Article Synopsis
- The pilot study examined financial losses and risk factors associated with hamstring injuries in elite Brazilian soccer players, with a focus on 34 male athletes over a 12-month season.
- Nine hamstring injuries were confirmed in eight players, leading to an average recovery time of 22 days and a potential financial loss of $43.2 million USD for the team.
- Factors linked to a higher risk of injury included past injuries, reduced knee flexor strength, decreased ankle flexibility, and a higher hamstring fatigue index, suggesting the need for preventive measures for those at higher risk.
Article Synopsis
- * This study aimed to see if there was a correlation between the eccentric force during the NHE and the one repetition maximum (1RM) of the deadlift among healthy student rugby players.
- * Results showed weak correlations between the 1RM of the deadlift and the peak eccentric forces measured during the NHE, suggesting they may not be closely related.
Acute Changes in Hamstring Injury Risk Factors After a Session of High-Volume Maximal Sprinting Speed Efforts in Soccer Players.
Sports Health
December 2024
ZENTRUM Rehab and Performance Center, Department of Physical Therapy, Barañain, Spain.
Article Synopsis
- The study investigates how a high-volume sprinting session affects sprint performance and risk factors for hamstring strain injuries in male amateur soccer players.* -
- Results show significant decreases in sprint performance and posterior chain muscle strength for up to 72 hours post-sprinting, indicating that such sessions can lead to fatigue and increased injury risk.* -
- The findings highlight the necessity for careful management of sprinting volume in training to minimize the risk of injuries while maintaining performance levels.*
Validity of Elastic Imaging Evaluation of Hamstring Muscles With Knee Contracture Using Ultrasound Shear Wave Elastography.
Cureus
August 2024
Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Sapporo, JPN.
Article Synopsis
- The study aimed to assess the mechanical properties of hamstring muscles from cadaveric specimens using ultrasound shear wave elastography (SWE), particularly focusing on those with knee flexion contractures.
- Hamstring muscle samples were tested for tensile strength, measuring the shear modulus and Young's modulus through a series of experiments involving strain and load application.
- Results indicated that hamstring muscles with flexion contractures showed significantly higher Young’s and shear moduli, suggesting they are stiffer and more resistant to elongation compared to muscles without contractures.
Article Synopsis
- The study aimed to establish the Fragility Index for hamstring injury risk factors, which indicates how many participants would need to change risk classification for a statistically significant risk factor to become nonsignificant.
- Researchers conducted a retrospective analysis of 78 articles focused on hamstring injury risk factors, creating 2 × 2 contingency tables to analyze relative risk and confidence intervals.
- Findings showed that the median Fragility Index for both modifiable and nonmodifiable risk factors was 3, with over 35% of these factors having a Fragility Index of 2 or less, highlighting that many significant associations are fragile and should be interpreted with caution.
Hamstring Muscle-Tendon Geometric Adaptations to Resistance Training Using the Hip Extension and Nordic Hamstring Exercises.
Scand J Med Sci Sports
September 2024
School of Health Sciences and Social Work, Griffith University, Gold Coast, Queensland, Australia.
Article Synopsis
- This study investigated how different resistance training exercises (Nordic and hip extension) affect hamstring muscle growth and the structure of tendons and aponeuroses over ten weeks.
- The results showed that Nordic exercises significantly increased semimembranosus tendon volume compared to a control group, while hip extension exercises enhanced the muscle volume-to-interface area ratio of the biceps femoris long head compared to both Nordic and control groups.
- Overall, there was minimal change in tendon-aponeurosis structure following either exercise intervention, indicating that different loading strategies may be needed to promote tendon adaptations.
Prognosticating Return-To-Play Time Following a Hamstring Strain Injury Using Early Flexibility Asymmetry and Musculoskeletal Ultrasound Imaging Outcomes: An Exploratory Study Among Canadian University Football Players.
Clin J Sport Med
September 2024
Faculty of Medicine, Université de Montréal, Montreal, QC, Canada; and.
Article Synopsis
- The study aimed to identify key flexibility and point-of-care ultrasound measures that can predict how long it will take elite Canadian university football players to return to play after a first hamstring strain injury (HSI).
- It followed 167 athletes over five seasons, collecting data on muscle flexibility and tissue alteration within a week of the injury.
- Results showed that greater flexibility asymmetry and specific ultrasound findings increased the chances of a longer recovery, outlining the importance of these measures in clinical decision-making for better RTP outcomes.
Article Synopsis
- - The study aimed to analyze the electromyography (EMG) activity of the biceps femoris (BF) muscle during the Nordic hamstring exercise (NHE) before and after a critical angle known as the break-point angle (BPA), using data collected through a smartphone app.
- - Researchers set out to validate the hypothesis that BF EMG activity would peak at the BPA and then gradually decline, measuring activity through specific knee flexion angles during the exercise.
- - Findings indicated there was no significant difference in EMG activity at BPA compared to peak activity, but BF EMG significantly decreased 20-25° after BPA, emphasizing the need for knee flexion exercises to maintain higher BF EMG at certain angles
The impact of a 10-week Nordic hamstring exercise programme on hamstring muscle stiffness, a randomised controlled trial using shear wave elastography.
J Sports Sci
August 2024
Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium.
Article Synopsis
- * A study looked at how a 10-week NHE program affected the strength and stiffness of hamstring muscles in soccer players, using a control group for comparison.
- * Results showed that while the NHE significantly increased eccentric strength in the experimental group, it did not change the stiffness of the hamstring muscles, suggesting stiffness changes might not be the main reason the NHE prevents injuries.
Fascicle Behavior and Muscle Activity of The Biceps Femoris Long Head during Running at Increasing Speeds.
J Sports Sci Med
September 2024
College of Physical Education and Health, Wenzhou University, Wenzhou, China.
Article Synopsis
- Hamstring strain injuries (HSIs) are common in high-speed running sports, particularly affecting the biceps femoris long head (BFlh) muscle, but the exact causes during running are not well understood.
- This study aimed to measure the behavior of the BFlh muscle-tendon unit (MTU) and its fascicles in college sprinters while running at varying speeds on a treadmill.
- Results showed that during the late swing phase of running, BFlh fascicles had minimal length change (about 1 cm) and were most active during both late swing and early stance phases, indicating a disconnect between muscle fascicle lengthening and MTU changes.
Characterizing Muscle Activity in Soccer Players with a History of Hamstring Strain Injuries during Accelerated Sprinting.
J Sports Sci Med
September 2024
Faculty of Sport Sciences, Waseda University, Tokyo, Japan.
Article Synopsis
- This study analyzed muscle activity in male soccer players with a history of hamstring strain injuries (HSI) compared to healthy players during 30-meter sprints.
- It involved 26 male soccer players, split into two groups (13 with HSI history and 13 healthy), and evaluated the activity of ten muscles through electromyography while running.
- Findings revealed that the HSI group had significantly lower muscle activity in key muscles like the gluteus maximus and external oblique, suggesting that they may be at a higher risk for injury during the early phase of a sprint.
Reverse Nordic Curl Does Not Generate Superior Eccentric Activation of the Quadriceps Muscle Than Bodyweight Squat-Based Exercises.
J Sport Rehabil
November 2024
Institute of Education, Federal University of Rio Grande, Rio Grande, RS, Brazil.
Article Synopsis
- The study focuses on the quadriceps femoris, a muscle commonly injured in sports involving kicking and sprinting, and assesses whether eccentric exercises like the Reverse Nordic Curl (RNC) can help prevent these injuries.
- Twenty-three healthy participants were monitored while performing RNC and three bodyweight squat exercises (single-leg squat, Bulgarian squat, forward lunge) to compare the eccentric activation of quadriceps muscles.
- The results indicated that RNC had similar activation levels for some muscles compared to squat-based exercises but was less effective at activating the vastus lateralis, suggesting it may not offer superior benefits for quadriceps strength training.
Secondary injury prevention reduces hamstring strain and time-loss groin injury burdens in male professional football.
Phys Ther Sport
November 2024
Australian College of Physical Education (ACPE), Sydney Olympic Park, Australia.
Article Synopsis
- - The study evaluated a secondary injury prevention strategy aimed at early detection and management of hamstring and groin injuries in a male Australian football club.
- - Data was collected from 73 players, monitoring specific strength measurements during the season to identify when interventions were necessary based on significant strength reductions.
- - Results indicated a notable decrease in both hamstring strain injury (19.8%) and groin injury (49.1%) among players during the intervention period compared to a prior control period, suggesting the effectiveness of the intervention.
Early Versus Late Rapid Force Production During Single-Joint Isometric Hamstring Assessment Using Force Plates.
J Strength Cond Res
August 2024
School of Health and Society, University of Salford, Salford, United Kingdom; and.
Article Synopsis
- The study aimed to investigate the differences in early versus late rapid force production in female soccer players during a specific hamstring assessment using force plates.
- 21 elite female soccer players participated, and they performed maximal isometric contractions to measure peak force and rapid force (RF) development at two time intervals: early (0-100 ms) and late (100-200 ms).
- Results showed significant differences, with early RF reaching about 52-54% of peak force compared to only about 15% for late RF, suggesting that tracking early RF could help practitioners optimize performance assessment and inform injury prevention strategies.