Relevant bibliographies by topics / Hamstring muscle strength

Academic literature on the topic 'Hamstring muscle strength'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Hamstring muscle strength"

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Lee, Jin Hyuck, Ki-Mo Jang, Eunseon Kim, Hye Chang Rhim, and Hyeong-Dong Kim. "Effects of Static and Dynamic Stretching With Strengthening Exercises in Patients With Patellofemoral Pain Who Have Inflexible Hamstrings: A Randomized Controlled Trial." Sports Health: A Multidisciplinary Approach 13, no. 1 (August 13, 2020): 49–56. http://dx.doi.org/10.1177/1941738120932911.

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Background: Patellofemoral pain (PFP) syndrome is closely associated with muscle tightness. However, studies regarding the effects of stretching exercises on PFP patients with inflexible hamstrings are scarce. The aim of the study was to compare the effects between static and dynamic hamstring stretching in patients with PFP who have inflexible hamstrings. Hypothesis: Compared with static hamstring stretching, dynamic hamstring stretching will improve the parameters of hamstring flexibility, knee muscle strength, muscle activation time, and clinical outcomes in this patient population. Study Design: Prospective randomized controlled trial. Level of Evidence: Level 2. Methods: A total of 46 patients (25, static stretching; 21, dynamic stretching) participated. Hamstring flexibility was assessed according to the popliteal angle during active knee extension. Muscle strength and muscle activation time were measured using an isokinetic device. Clinical outcomes were evaluated using the visual analog scale (VAS) for pain and the anterior knee pain scale (AKPS). Results: There were no differences in hamstring flexibility and knee muscle strength of the affected knees between the groups ( P > 0.05). Significantly improved muscle activation time and clinical outcomes of the affected knees were observed in the dynamic stretching group compared with the static stretching group (all Ps < 0.01 for hamstring, quadriceps, VAS, and AKPS). Conclusion: In patients with PFP who have inflexible hamstrings, dynamic hamstring stretching with strengthening exercises was superior for improving muscle activation time and clinical outcomes compared with static hamstring stretching with strengthening exercises. Clinical Relevance: Clinicians and therapists could implement dynamic hamstring stretching to improve function and reduce pain in patients with PFP who have inflexible hamstrings.
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Harput, Gulcan, Hasan Erkan Kılınc, Hamza Özer, Gül Baltacı, and Carl G. Mattacola. "Knee Muscle Strength Recovery in the Early Period After ACL Reconstruction." Orthopaedic Journal of Sports Medicine 2, no. 11_suppl3 (November 1, 2014): 2325967114S0014. http://dx.doi.org/10.1177/2325967114s00141.

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Objectives: The aim of this study was to investigate quadriceps and hamstrings isometric strength at 4, 8 and 12 week time points following ACL Reconstruction (ACLR) and to document the strength changes of these muscles over time. The primary hypothesis was that there would be significant increases in quadriceps and hamstring muscle strengths between the 4th, 8th and 12th weeks following ACLR. The secondary hypothesis was that the quadriceps index would be higher than hamstring index at 12th week after ACLR. Methods: Thirty patients (Mean ± SD [age, 29.1±2.3yrs; weight, 77.3±13.2kg; height, 172.1±7.1cm; BMI, 21.2±3.5kg/m2, time to surgery: 7.1±7.2 months]) who underwent ACLR with Hamstring Tendon Autograft (HTG) were enrolled in this study. The isometric strength of quadriceps and hamstring muscles was measured on an isokinetic dynamometer at 60° knee flexion angle at 4th, 8th and 12th weeks after surgery. The recovery of quadriceps and hamstring muscles strength following rehabilitation was expressed as a Quadriceps Index (QI) and Hamstring Index (HI) and calculated with the following formula:[(maximum voluntary isometric torque of the involved limb / maximum voluntary isometric torque by uninvolved limb) × 100]. Torque output of the involved and uninvolved limbs and quadriceps and hamstring indexes were used for the statistical analysis. A repeated measures of ANOVA was used to determine the strength changes of quadriceps and hamstrings over time. Results: Quadriceps and Hamstrings strengths significantly increased over time for both involved (Quadriceps: F (2,46)=58.3, p<0.001, Hamstring: F (2,46)=35.7, p<0.001) and uninvolved limb (Quadriceps: F(2,46)=17.9, p<0.001, Hamstring: F(2,46)=56.9, p=0.001 ). Quadriceps strength was higher at 12th week when compared to the 8 and 4 week time points for the involved limb (p<0.001), and it was higher at 8th week when compared to 4 week time point for the involved limb (p<0.001). For the uninvolved limb, quadriceps strength was also higher at 12th week when compared to the 8 (p=0.02) and 4 week time point (p<0.001), and higher at 8 week when compared to the 4 week time point (p=0.02). Hamstring strength was higher at 12 week when compared to the 8 and 4 week time points (p<0.001) and it was higher at 8 week when compared to 4 week time point for the involved limb (p<0.001). For the uninvolved limb hamstring strength was also higher at 12 week when compared to 4 week time point (p=0.01). There was no significant difference between the 4 and 8 week time points (p>0.05) or between the 8 and 12 week time points (p=0.07). Quadriceps and hamstring indexes significantly changed from 4th weeks (QI:57.9, HI:54.4 ) to 8th weeks (QI:78.8, HI:69.9 ) and from 8th weeks to 12th weeks (QI:82, HI:75.7 ) (p<0.001); however, there was no difference between indexes at the 12-week time point (p=0.17). Conclusion: Isometric strength of quadriceps and hamstring muscles for the involved and uninvolved limb increased during the early period of ACLR. The results of this study could be a baseline for clinicians while prescribing a rehabilitation protocol for ACLR patients with HTG to better appreciate expected strength changes of the muscles in the early phase.
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Kellis, Eleftherios, Nikiforos Galanis, and Nikolaos Kofotolis. "Hamstring-to-Quadriceps Ratio in Female Athletes with a Previous Hamstring Injury, Anterior Cruciate Ligament Reconstruction, and Controls." Sports 7, no. 10 (September 28, 2019): 214. http://dx.doi.org/10.3390/sports7100214.

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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−1 and 240°·s−1. The functional (eccentric hamstring to concentric quadriceps) torque ratio was evaluated at 120°·s−1. Finally, the mixed (eccentric hamstrings at 30°·s−1 to concentric quadriceps at 240°·s−1) torque ratio was calculated. Both ACL and the hamstring-injured groups showed a lower quadriceps and hamstrings strength compared with controls (p < 0.05). However, non-significant group differences in the H:Q ratio were found (p > 0.05). Isokinetic assessment of muscle strength may be useful for setting appropriate targets of training programs for athletes with a history of ACL surgery or hamstring strain. However, isokinetic evaluation of the H:Q ratio is not injury—specific and it does not vary between different methods of calculating the H:Q ratio.
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Vertullo, Christopher J., Jason M. Konrath, Benjamin Kennedy, Hamish Bush, Rodney S. Barrett, and David G. Lloyd. "HAMSTRING MORPHOLOGY AND STRENGTH REMAIN ALTERED 2 YEARS FOLLOWING A HAMSTRING GRAFT IN ACL RECONSTRUCTION." Orthopaedic Journal of Sports Medicine 5, no. 5_suppl5 (May 1, 2017): 2325967117S0018. http://dx.doi.org/10.1177/2325967117s00181.

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Background: The hamstring graft used in anterior cruciate ligament (ACL) reconstruction has been shown to lead to changes to the semitendinosus and gracilis musculature. This study further evaluated the effect of the surgery on hamstring muscle morphology and knee muscle strength at 2 years post-surgery. Hypotheses: (1) Loss of donor muscle size would significantly correlate with knee muscle strength deficits (2) Loss of donor muscle size would be greater for muscles that do not experience tendon regeneration, and (3) Morphological adaptations would also be evident in non-donor knee muscles. Study Design: Cross sectional evaluation. Methods: 20 participants (14 male, 6 female, 29 ± 7 years, 82 ± 15 kg) that had undergone a hamstring graft in ACL reconstruction at least two years previously, underwent bilateral MRI and subsequent strength testing. Muscle and tendon volumes, peak CSA’s and lengths were determined for 12 muscles and 6 functional muscle groups of the surgical and contralateral limbs. Peak isokinetic concentric strength was measured in knee flexion/extension and internal/external tibial rotation. Results: Only 50% of the patients regenerated both the semitendinosus and gracilis tendons. The regenerated tendons were longer with larger volume and CSA compared to the contralateral side. Deficits in semitendinosus and gracilis muscle size were greater for tendons that did not regenerate. In addition, combined hamstrings (semitendinosus, semimembranosus, biceps femoris) and combined medial knee muscles (semitendinosus, semimembranosus, gracilis, vastus medialis, medial gastrocnemius, sartorius) on the surgical side were reduced in volume by 12% and 10% respectively. A 7% larger volume was observed in the surgical leg for the biceps femoris and corresponded with a lower internal/external tibial rotation strength ratio. The difference in volume, peak CSA and length of the semitendinosus and gracilis correlated significantly with the deficit in knee flexion strength with Pearson correlations of 0.51, 0.57 and 0.61 respectively. Conclusion: The muscle-tendon properties of the semitendinosus and gracilis are substantially altered following harvesting, and these alterations may contribute to knee flexor weakness in the surgical limb. These deficits are more pronounced in tendons that do not regenerate and are only partially offset by compensatory hypertrophy of other hamstring muscles. Clinical Relevance: Surgeons should consider muscle retraction of the hamstring following tendon harvest in their choice of graft option for ACL reconstruction.
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Gérard, Rémy, Léo Gojon, Philippe Decleve, and Joachim Van Cant. "The Effects of Eccentric Training on Biceps Femoris Architecture and Strength: A Systematic Review With Meta-Analysis." Journal of Athletic Training 55, no. 5 (May 1, 2020): 501–14. http://dx.doi.org/10.4085/1062-6050-194-19.

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Objective To determine the effects of an eccentric hamstrings strength-training program, performed for at least 4 weeks by healthy adults, on muscle architecture and eccentric strength. Data Sources A systematic search was performed up to October 2018 in the following electronic databases: PubMed, PEDro, CINAHL and SPORTDiscus. Combinations of the following search terms were used: eccentric strength training, eccentric loading, nordic hamstring, hamstring strength, fascicle length, pennation angle, muscle thickness, muscle architecture, biceps femoris long head, biceps femoris, and hamstring muscles. Study Selection Included articles were randomized controlled trials that allowed comparisons between isolated eccentric strength training of the biceps femoris muscle and other programs. Data Extraction Data from the included studies were extracted by 2 independent reviewers. These data included the study design, participant characteristics, inclusion and exclusion criteria of clinical studies, exercise and intervention characteristics, outcome measures, and the main results of the study. When meta-analysis was possible, we performed quantitative analysis. Ten randomized controlled trials were included. Data Synthesis Limited to moderate evidence indicated that eccentric strength training was associated with an increase in fascicle length (mean difference [MD] = 1.97; 95% confidence interval [CI] = 1.48, 2.46), an increase in muscle thickness (MD = 0.10; 95% CI = 0.06, 0.13), and a decrease in pennation angle (MD = 2.36; 95% CI = 1.61, 3.11). Conflicted to moderate evidence indicated that eccentric hamstrings strength was increased after eccentric strength training compared with concentric strength training (standardized mean difference [SMD] = 1.06; 95% CI = 0.26, 1.86), usual level of activity (SMD = 2.72; 95% CI = 1.68, 3.77), and static stretching (SMD = 0.39; 95% CI = −0.97, 1.75). Conclusions In healthy adults, an eccentric strength-training program produced architectural adaptations on the long head of the biceps femoris muscle and increased eccentric hamstrings strength.
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Song, Mun-ku. "Isokinetic Quadriceps and Hamstring Muscle Strength Values in K League 1 Professional Soccer Players." Korean Journal of Sport Science 32, no. 4 (December 31, 2021): 472–80. http://dx.doi.org/10.24985/kjss.2021.32.4.472.

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PURPOSE This study aimed to present isokinetic quadriceps and hamstring muscle strength values in K league 1 (K1) professional soccer players and compare these results to those of published studies.METHODS A total of 31 K1 soccer players (age 24.5±4.2) without a history of lower limb injury were included in this study. Isokinetic knee strength tests were implemented at a velocity of 60°·s-1 and 180°·s-1 for both dominant (D) and non-dominant (ND) legs using a dynamometer. Strength variables included peak torque (PT), body mass normalized PT (NPT), bilateral strength difference (BD), and hamstring to quadriceps strength (H/Q) ratio.RESULTS At 60°·s-1 velocity, the NPTs of the quadriceps were 3.39N·m·kg-1 and 3.33N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 2.00N·m·kg-1 and 1.89N·m·kg-1 for D and ND legs, respectively. At 180°·s-1 velocity, the NPTs of the quadriceps were 2.31N·m·kg-1, 2.27N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 1.42N·m·kg-1, 1.39N·m·kg-1 for D and ND legs, respectively. At all velocities, the BDs of quadriceps and hamstring muscles ranged from 6.6–7.8%, and H/Qs ranged from 57–62%. Compared to previous studies that did not consider the history of injury, this study showed lower levels of BD (less than 10%) and higher levels of NPT.CONCLUSIONS The presented isokinetic quadriceps and hamstring muscle strength values can be used as reference values for the isokinetic knee strength of K1 professional soccer players.
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Spinoso, Deborah Hebling, Murilo Goulart, Antonio Ferreira, and Marcelo Navega. "Analysis of the relationship between hamstring flexibility with muscular strength and its response to myofascial release." Manual Therapy, Posturology & Rehabilitation Journal 20 (September 15, 2022): 1–7. http://dx.doi.org/10.17784/mtprehabjournal.2022.20.1235.

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Background: Decreased flexibility can contribute to postural changes, the deficit in the ability to produce strength, and predispose to injuries. Currently, several myofascial release techniques work to improve muscle flexibility. Objective: To analyze the relationship between flexibility and muscle strength of the knee flexors and to verify the acute effect of two modalities of myofascial release on the flexibility of the hamstrings. Methods: 45 women participated in this study, divided into Manual Release Group, Instrumental Release Group, and Control Group. A sit and reach test, a third finger floor test, an assessment of the popliteal angle, and an assessment of knee flexion muscle strength were performed. Subsequently, the volunteers received a myofascial release session in the hamstring muscle group. After treatment, the volunteers were reassessed. Results: Both groups that received myofascial release performed better in flexibility tests. There was no correlation between hamstring flexibility and the ability to produce joint torque from knee flexion. Conclusion: The flexibility of the hamstring muscles did not influence the ability to produce knee flexion torque and both myofascial release techniques were effective in improving the flexibility of this musculature.
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Wang, Guo Dong, and A. Ming Lu. "A Strength Training Machine Specific for Hamstrings: Injury Prevention and Rehabilitation." Applied Mechanics and Materials 195-196 (August 2012): 35–40. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.35.

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Hamstring muscle strains are one of the most frequent injuries in sports and will result in missed game time by athletes. A sudden and forceful eccentric muscle contraction during the later swing phase of sprinting may directly induce hamstring injury, so does a fast change between eccentric and concentric actions in the foot contact phase. Based on the biomechanical analysis of the hamstring muscle activities during sprinting and the studies focused on hamstring strength training, the purpose of this study is to design a strength training machine specific for hamstring. The activity of hamstring muscles during training simulated the key phase of sprinting in terms of contraction modes and loads. The design principle and usage of the machine, as well as the points for attention, are illustrated in this paper.
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Aktuğ, Zait Burak, Ali Kerim Yılmaz, Serkan İbiş, Hasan Aka, Cengiz Akarçeşme, and Tamer Sökmen. "The Effect of 8-Week Nordic Hamstring Exercise on Hamstring Quadriceps Ratio and Hamstring Muscle Strength." World Journal of Education 8, no. 3 (June 25, 2018): 162. http://dx.doi.org/10.5430/wje.v8n3p162.

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The aim of the study is to investigate the effect of 8-week Nordic Hamstring (NH) exercise on hamstring/quadricepsratio (H/Q) and hamstring muscle strength. 22 amateur soccer players participated in the study. Soccer players weredivided into two groups: the control group (CG) (n = 11) who only practiced soccer training and the NordicHamstring exercise group (NHEG) (n = 11) who performed NH in addition to soccer training. The isokinetic kneemuscle strength of the soccer player was measured twice at the beginning of the study and after the 8 week NHexercise. An isokinetic dynamometer was used to determine isokinetic knee strengths of soccer players. Thedifference between pre-test and post-test results of isokinetic knee muscle strength of soccer players was determinedby Wilcoxon test. According to the results obtained, it was found that the H/Q ratio (at 180ºs-1 and 240ºs-1 angularvelocities) and hamstring muscle strength (60ºs-1, 180ºs-1 and 240ºs-1 angular velocities) increased statisticallysignificantly (p<0.05). As a result, it can be stated that NH exercise is a very important factor in achieving thedesired level of H/Q ratio, which is an important factor in increasing sportive performance and thus decreasing therisk of injury as well as increasing hamstring muscle strength.
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Sannicandro, Italo. "Hamstring injury prevention: the strength assessment in young soccer players." MOJ Sports Medicine 3, no. 2 (April 26, 2019): 28–32. http://dx.doi.org/10.15406/mojsm.2019.03.00075.

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Aim: The hamstring strength training in youth soccer is relevant both for muscle injury prevention and for sprint performance increase. This study aim to assessment hamstring eccentric strength in young soccer players to know any lower limb strength asymmetries Methods: The sample is composed of male young soccer players Under 17 (n=14, 16,6±0,5 years, 175,8±7,1cm and 70,9±9,1 kg). To assess the hamstring eccentric strength and the lower limb eccentric strength asymmetry have been used a specific dynamometer (NordBord Hamstring Testing System, Vald Performance, Australia) with software. Every young soccer player performed a single repetition of the Nordic hamstring exercise with constraint to the Nord Bord; after about 10 minutes, instead, they performed 5 repetitions of the same exercise, without interruption. All values were acquired using NordBord software: for both assessments, were detected the eccentric strength and the lower limbs strength asymmetry. Results: The evaluation of the hamstring eccentric strength does not show substantial and statistically significant differences in the single test with reference to the peak parameter. In the comparison between the average eccentric strength expressed in the 5 repetitions there is a statistically significant difference between the values expressed by the two limbs (p<0-05), and an increase in the value asymmetry is observed (15,8±5,4%). Conclusion: This difference between the two tests leads us to think that the fatigue potential effect on the hamstring muscles deriving from the number of repetitions requested, can accentuate and highlight to a greater extent the differences between the hamstrings of the two lower limbs in the young player.
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Dissertations / Theses on the topic "Hamstring muscle strength"

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張劍強 and Kim-keung Cheung. "The effect of hamstring stretching technique on hamstring flexibility and isokinetic strength." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B3125715X.

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Cheung, Kim-keung. "The effect of hamstring stretching technique on hamstring flexibility and isokinetic strength /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23425374.

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Sonnekalb, Sara. "Impact of different warm-up conditions on hamstring torque and power." Connect to this title online, 2005. http://www.oregonpdf.org.

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Thesis (M. Ed.)--Bowling Green State University, 2005.
Includes bibliographical references (leaves 38-44). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
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Bourne, Matthew N. "Hamstring strain injury: The role of strength and voluntary activation." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/98262/4/Matthew_Bourne_Thesis.pdf.

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Hamstring strain injuries are endemic in running-based sports, often resulting in substantial performance decrements and costing professional sporting organisations millions of dollars each year. This program of research has contributed new knowledge relating to factors which may predispose to, and manifest as a result of hamstring injury, while also providing novel data which may be used to inform injury prevention and rehabilitation practices.
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Edupuganti, Pradeep. "Effect of resistance training in the improvement of hamstrings to quadriceps (H:Q) strength ratio in males and females." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Willhoit, Kristin Florence. "Effect of ankle position on hamstring strength during maximum and submaximum leg curls." [Pensacola, Fla.] : University of West Florida, 2007. http://purl.fcla.edu/fcla/etd/WFE0000048.

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Fondran, Kristine Marie. "THE EFFECT OF SURYA NAMASKARA YOGA PRACTICE ON RESTING HEART RATE AND BLOOD PRESSURE, FLEXIBILITY, UPPER BODY MUSCLE ENDURANCE, AND PERCEIVED WELL-BEING IN HEALTHY ADULTS." Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1220456637.

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Evangelidis, Pavlos. "Hamstrings muscle anatomy and function, and implications for strain injury." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18033.

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The main aim of this thesis was to examine hamstrings anatomy and its influence on knee flexor muscle function in healthy young men. A secondary aim was to better understand the implications of hamstrings anatomy and function, and their variability, in relation to the risk of strain injury. The functional and conventional H:Q ratios (examined up to high angular velocities) as well as the knee joint angle-specific isometric H:Q ratio exhibited good test-retest reliability at joint positions that closely replicated the conditions of high injury risk. Football players did not exhibit any differences in angle-specific or peak torque H:Q ratios compared to recreationally active controls. Knee extensor and flexor strength, relative to body mass, of footballers and controls was similar for all velocities, except concentric knee flexor strength at 400° s-1 (footballers +40%; P < 0.01). Muscle volume explained 30-71% and 38-58% of the differences between individuals in knee extensors and flexors torque respectively across a range of velocities. A moderate correlation was also found between the volume of these antagonistic muscle groups (R2= 0.41). The relative volume of the knee extensors and flexors explained ~20% of the variance in the isometric H:Q ratio and ~31% in the high velocity functional H:Q ratio. Biceps femoris long head exhibited a balanced myosin heavy chain isoform distribution (47.1% type I and 52.9 % total type II) in young healthy men, while BFlh muscle composition was not related to any measure of knee flexor maximal or explosive strength. Biceps femoris long head proximal aponeurosis area varied considerably between participants (>4-fold) and was not related to biceps femoris long head maximal anatomical cross-sectional area (r= 0.04, P= 0.83). Consequently, the aponeurosis:muscle area ratio exhibited 6-fold variability (range, 0.53 to 3.09; CV= 32.5%). Aponeurosis size was not related to isometric or eccentric knee flexion strength. The findings of this thesis suggest that the main anatomical factor that contributes to knee flexors function in vivo is hamstrings muscle size, while muscle composition and aponeurosis size do not seem to have a significant influence. The high inter-individual variability of the biceps femoris long head proximal aponeurosis size suggests that a disproportionately small aponeurosis may be a risk factor for strain injury. In contrast, biceps femoris long head muscle composition does not seem to explain the high incidence of strain injuries in this muscle. Quadriceps and hamstrings muscle size imbalances contribute to functional imbalances that may predispose to strain injury and correction of any size imbalance may be a useful injury prevention tool. Finally, regular exposure to football training and match-play does not seem to influence the balance of muscle strength around the knee joint.
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Gustavsson, Robert, and Fredrik Eklund. "Styrkeförhållandet mellan knäflexorer och knäextensorer." Thesis, Mälardalens högskola, Akademin för hälsa, vård och välfärd, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12205.

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Bakgrund: Inom forskningen studeras styrkeförhållandet i lårets muskler och anges ofta som flexor/extensor kvot (F/E-kvot). Ett sätt att mäta denna kvot är att använda isokinetiska styrketest.  Forskningen är inte överens om ett optimalt styrkeförhållande i denna muskulatur eller om för stor styrkeskillnad kan ge upphov till skada. Om en optimal kvot kan fastställas är det intressant i ett förebyggande och rehabiliterande syfte.  Syfte: Att beskriva och jämföra F/E-kvoten hos en grupp manliga fotbollsspelare med en grupp fysiskt aktiva män mellan 16 och 25 år. Metod: Mätning av maximal isokinetisk styrka i knäledens flexor och extensormuskler genomfördes med Genesis Single. Resultat: Studien fann en F/E-kvot hos fotbollsspelarna på 78,2 % på höger ben och 77 % på vänster ben. Jämförelsegruppen hade en F/E-kvot på 73,7 % på höger ben och76,4 % på vänster ben. Utifrån detta kunde man inte finna någon signifikant skillnad mellan de båda grupperna Slutsats: Studien fann ingen signifikant skillnad i F/E-kvot i höger respektive vänster ben mellan en grupp fotbollsspelare och jämförelsegrupp. Vidare forskning om reliabilitet och validitet med Genesis Single som mätinstrument bör utföras innan fler studier utförs med maskinen.
Background: The kneeflexor and kneextensor muscle strength ratio (F/E ratio) is a widely researched area where isokinetic tests are often used. There seems to be little consensus regarding the optimal ratio and also whether a low ratio increase the risk of injury. It would be interesting from a preventive and rehabilitative stand point if an optimal ratio could be decided upon.  Objectives: To compare the F/E ratio between a group of 16-25 year old soccer players and a group of physically active males. Methods: Isokinetic maximal strength in kneeflexors and kneextensors were measured with Genesis Single. Results: The ratio of the soccer players was 78,2 % in the right leg and 77 % in the left. The comparison group was found to have a ratio of 73,7 % in the right leg and 76,4 % in the left leg. There were no significant differences between the two groups. Conclusions: No significant differences could be determined between the two groups. Genesis Single needs to be further investigated with regards to its reliability and validity.
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Moretti, Giacomo. "Il rinforzo muscolare eccentrico in prevenzione agli infortuni ai muscoli ischio-crurali: revisione basata sull'evidenze." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18264/.

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Introduzione: Le lesioni muscolari agli ischiocrurali sono fra i più frequenti infortuni in cui incorre uno sportivo che compie gesti atletici come corsa, scatti e decelerazioni, cambi di direzione e salti. L’eziologia lesiva di questi muscoli dimostra come la stragrande maggioranza degli infortuni avvenga durante una contrazione eccentrica, dove i muscoli esercitano la loro principale funzione. Si è deciso di indagare l’efficacia del rinforzo muscolare eccentrico in prevenzione agli infortuni a tale gruppo muscolare. Obiettivo: Ricercare le evidenze in letteratura sull’efficacia del rinforzo muscolare eccentrico in prevenzione agli infortuni al gruppo muscolare degli ischiocrurali. Metodi: La ricerca è stata svolta presso le principali banche dati biomediche, includendo le Revisioni Sistematiche pubblicate negli ultimi 10 anni in lingua inglese, che indagassero l’efficacia di un intervento comprendente il rinforzo muscolare eccentrico ai muscoli ischiocrurali su una popolazione di sportivi, e i cui outcome misurassero l’incidenza degli infortuni. Risultati: Sono stati selezionati 3 studi, valutati tramite AMSTAR Checklist. I risultati raccolti dagli autori valutano positivamente, con più o meno evidenza scientifica, l’efficacia del rinforzo muscolare in prevenzione agli infortuni ai muscoli ischiocrurali, nel contesto in cui sono stati somministrati. Una revisione dimostra come la compliance all’intervento mostrata dai partecipanti influenzi significativamente i risultati ottenuti. Conclusioni: I risultati ottenuti dalle revisioni suggeriscono il proseguimento delle ricerche riguardanti l’efficacia di tale intervento in prevenzione agli infortuni ai muscoli ischiocrurali, tramite nuovi studi condotti con un rigore metodologico maggiore. I limiti mostrati dagli studi inclusi devono essere usati come orientamento per le future ricerche, nel tentativo di giungere a risultati il più significativi possibili.
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Books on the topic "Hamstring muscle strength"

1

O'Sullivan, Kieran. The role of muscle strength in hamstring injury. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Armstrong, Douglas. Quadriceps-hamstring ratios for isotonic and isokinetic measurements. 1985.

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Armstrong, Douglas. Quadriceps-hamstring ratios for isotonic and isokinetic measurements. 1985.

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Quadriceps/hamstrings strength ratios and hip flexibility as predictors of hamstring injuries. 1985.

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Quadriceps-hamstring ratios for isotonic and isokinetic measurements. 1985.

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Douglas, Armstrong. Quadriceps-hamstring ratios for isotonic and isokinetic measurements. 1985.

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Douglas, Armstrong. Quadriceps-hamstring ratios for isotonic and isokinetic measurements. 1985.

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The effect of training volume on strength and hypertrophy of the quadriceps and hamstring muscles. 1994.

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Effects of statically performed toe touch stretches on torque production of the hamstring and quadriceps muscle groups. 1988.

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Effects of statically performed toe touch stretches on torque production of the hamstring and quadriceps muscle groups. 1990.

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Book chapters on the topic "Hamstring muscle strength"

1

Sugiura, Yusaku, Yuji Takazawa, Kazuhiko Yamazaki, and Kazuhiko Sakuma. "Strategic Prevention Program of Hamstring Injuries in Sprinters." In Injury and Sports Medicine [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108075.

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Enhancing the functionality of the hamstring is an important matter for sprinters in improving their performance. Sprinters show almost the highest incidences of hamstring injuries as compared with other athletes. For sprinters and their coaches, prevention of hamstring injury is a prime concern along with improved their performance. To prevent hamstring injuries in sprinters, injury, incidence, mechanisms, and risk factors need to be taken into consideration, and a strategic program based on evidence needs to be implemented. A combination of three factors: agility, strength, and flexibility, is a good contributor to preventing muscle injuries in sprinters. Simultaneously, the training programs need to take into consideration the conditioning for muscle fatigue depending on a sprinter’s abilities. It may be important for coaches, trainers, and sports doctors to encourage sprinters for stopping training to monitor the degree of fatigue objectively and subjectively and to avoid the risk of injury. Future establishment of a hamstring injury-prevention program will be achieved by building a support system for programs with tactics and strategies. These programs are based on the accumulation of data via cooperation among coaches, researchers, trainers, and sports doctors.
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"Figure 3. (a) Functional hamstring/quadriceps strength ratio developed by the 4 groups. Positive velocity: Hecc/Qcon representative for knee extension. Negative velocity: Hcon/Qecc representative for knee flexion. (b) Conventional hamstring/quadriceps strength ratio developed by the 4 groups. Positive velocity: concentric muscle contraction (Hcon/Qcon). Negative velocity: eccentric muscle contraction (Hccc/Qccc). Values are means (±SD)." In Science and Football V, 167–68. Routledge, 2005. http://dx.doi.org/10.4324/9780203412992-62.

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Conference papers on the topic "Hamstring muscle strength"

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Irwin, Ellevyn, Grainne O’Callaghan, Aine Tunney, Eamonn Delahunt, and Ulrik McCarthy Persson. "155 Clinically-oriented assessments of hamstring muscle strength are reliable." In IOC World Conference on Prevention of Injury & Illness in Sport 2021. BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine, 2021. http://dx.doi.org/10.1136/bjsports-2021-ioc.143.

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Bregenhof, Bo. "3 The effect of progressive resistance exercise on knee muscle strength and function in participants with persistent hamstring deficiency following ACLR." In #Sportskongres 2023, 2–4 February, Copenhagen, Denmark. BMJ Publishing Group Ltd, 2023. http://dx.doi.org/10.1136/bmjsem-2023-sportskongres2023.3.

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Yang, Hongzhi, Yi-Chun Li, and Mohamed Samir Hefzy. "Isometric Co-Contractions of the Quadriceps and Hamstrings in Intact and PCL-Deficient Knees." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0445.

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Abstract The exercises to strengthen the muscles around the knee are designed to improve its stability. During these exercises, co-contraction of the hamstrings occur depending on the level of quadriceps contraction. The purpose of this study is to develop a three-dimensional knee model that includes tibia, femur and patella and allows to predict knee response due to quadriceps and hamstrings co-contractions. As an application, results quantifying the changes in knee response are obtained following a simulated posterior cruciate ligament (PCL) injury. This is motivated by the continuing debate whether surgical repair is the method of choice for individuals with such an injury. It has been reported that following a knee injury, a large number of patients with PCL deficiency develop significant disability with Osteoarthritis (OA). The conditions tested simulate the straight-leg-raise exercise, during which the quadriceps muscles contract isometrically along with hamstrings co-contractions.
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Hefzy, Mohamed S., Hongzhi Yang, Eihab M. Abdel-Rahman, and Mohamad Alkhazim. "Effects of Knee Flexion Angle and Quadriceps Contraction on Hamstrings Co-Contraction." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0270.

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Abstract Open and closed kinetic chain exercises are being used as knee rehabilitation regiments. These exercises are designed to strengthen the muscles around the knee in order to improve its stability. Following a knee injury and/or surgery, the patient is asked to perform an isometric contraction of the quadriceps as the very first task of the rehabilitation process. Co-contraction of the hamstrings may occur depending on the amount of quadriceps contraction and the angle of knee flexion at which this isometric contraction is performed. The purpose of this study is to determine the effects of the knee flexion angle and the quadriceps tension on the amount of hamstrings co-contraction that occurs during an isometric contraction of the quadriceps muscles.
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