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Adaptations in biceps femoris long-head muscle-tendon mechanics during the Nordic hamstring exercise in response to 9 weeks of training 认领 引用
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作者 Max H.Andrews Anoosha Pai S +4 位作者 Reed D.Gurchiek Paul W.Hodges Glen A.Lichtwark Scott L.Delp Patricio A.Pincheira 《Journal of Sport and Health Science》 SCIE CAS CSCD 2026年第7期15-25,I0002,共11页
Background:Prolonged Nordic hamstring exercise(NHE)training reduces hamstring injury risk,but the underlying mechanisms remain unclear.This study examined how NHE training alters biceps femoris long-head(BFlh)muscle-t... Background:Prolonged Nordic hamstring exercise(NHE)training reduces hamstring injury risk,but the underlying mechanisms remain unclear.This study examined how NHE training alters biceps femoris long-head(BFlh)muscle-tendon unit(MTU)mechanics during the exercise,focusing on how muscle adaptations influence fascicle and sarcomere lengths during the NHE after training.Methods:Twelve recreationally active participants completed 9 weeks of supervised NHE training and 3 weeks of detraining.Knee flexor torque was measured using ankle-mounted load cells and estimated from the knee joint moment arm.BFlh fascicle lengths were assessed during the NHE using dual-transducer ultrasound,and MTU length was estimated from joint angles using markerless motion capture.Sarcomere lengths during the NHE were estimated using instantaneous BFlh fascicle length and previously calculated serial sarcomere numbers.Linear mixedeffects models analyzed changes between pre-training,post-training,and post-detraining.Results:Nine weeks of NHE training increased peak knee flexor torque by 40%(previously reported),enabling 37%greater knee extension(p=0.012)and 4%longer MTU lengths at peak torque during the NHE(p=0.001).BFlh fascicles reached 25%longer lengths during the NHE at peak torque after training(p<0.001),while estimated active sarcomere lengths at peak torque were unchanged(p=0.266).Following 3 weeks of detraining,knee flexor torque decreased by 6%(previously reported)and fascicle lengths at peak torque decreased by 14%(p<0.001),while MTU length(p=0.578)and estimated active sarcomere length(p=0.753)at peak torque during the NHE did not significantly change compared to post-training.Conclusion:Despite the longer fascicle lengths during the NHE after training,estimated active sarcomere length during the NHE relative to optimal sarcomere length remained similar,consistent with the addition of sarcomeres in series,which may contribute to the protective effects of NHE training. 展开更多
关键词 Nordic Hamstring Exercise Muscle Tendon Unit fascicle sarcomere lengths flexor torque Biceps Femoris Long Head nordic hamstring exercise nhe training muscle adaptations Fascicle Length
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Hamstring muscle architecture and microstructure changes following Nordic hamstring exercise training and detraining 认领 引用
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作者 Anoosha Pai S Max H.Andrews +9 位作者 Reed D.Gurchiek Patricio A.Pincheira Marco Barbieri Tyler Friedrich Feliks Kogan Garry E.Gold Valentina Mazzoli Glen A.Lichtwark Scott L.Delp Akshay S.Chaudhari 《Journal of Sport and Health Science》 SCIE CSCD 2025年第6期88-98,共11页
Background While Nordic hamstring exercise(NHE)training has been shown to reduce hamstring strains,the muscle-specific adaptations to NHE across the 4 hamstrings remain unclear.This study investigates architectural an... Background While Nordic hamstring exercise(NHE)training has been shown to reduce hamstring strains,the muscle-specific adaptations to NHE across the 4 hamstrings remain unclear.This study investigates architectural and microstructural adaptations of the biceps femoris short head(BFsh),biceps femoris long head(BFlh),semitendinosus(ST),and semimembranosus(SM)in response to an NHE intervention.Methods Eleven subjects completed 9 weeks of supervised NHE training followed by 3 weeks of detraining.Magnetic resonance imaging was performed at pre-training,post-training,and detraining to assess architectural(volume,fiber tract length,and fiber tract angle)and microstructural(axial(AD),mean(MD),radial(RD)diffusivities,and fractional anisotropy(FA))parameters of the 4 hamstrings.Results NHE training induced significant but non-uniform hamstring muscle hypertrophy(BFsh:22%,BFlh:9%,ST:26%,SM:6%)and fiber tract length increase(BFsh:11%,BFlh:7%,ST:18%,SM:10%).AD(5%),MD(4%),and RD(5%)showed significant increases,but fiber tract angle and FA remained unchanged.After detraining,only ST showed a significant reduction(8%)in volume,which remained higher than the pre-training value.While fiber tract lengths returned to baseline,AD,MD,and RD remained higher than pre-training levels for all hamstrings.Conclusion The 9-week NHE training substantially increased hamstring muscle volume with greater hypertrophy in ST and BFsh.Hypertrophy was accompanied by increases in fiber tract lengths and cross-sections(increased RD).After 3 weeks of detraining,fiber tract length gains across all hamstrings declined,emphasizing the importance of sustained training to maintain all the protective adaptations. 展开更多
关键词 Hamstrings Nordic hamstring exercise Diffusion tensor imaging Exercise adaptation
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Commentary on“Multiscale hamstring muscle adaptations following 9 weeks of eccentric training” 认领 引用
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作者 Markus Tilp 《Journal of Sport and Health Science》 SCIE CSCD 2025年第1期67-68,共2页
The maximal force a muscle can exert depends on its length,which has been explained by the sliding filament theory on the sarcomere level.1 A longer muscle can act over a greater range of motion and has more sarcomere... The maximal force a muscle can exert depends on its length,which has been explained by the sliding filament theory on the sarcomere level.1 A longer muscle can act over a greater range of motion and has more sarcomeres in series,which increases its capacity to produce force at a specific muscle contraction velocity because each sarcomere contracts at a lower velocity. 展开更多
关键词 muscle length sliding filament theory sarcomere level force production multiscale hamstring muscle adaptations contraction velocity
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Multiscale hamstring muscle adaptations following 9 weeks of eccentric training 认领 引用 被引量：6
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作者 Max H.Andrews Anoosha Pai S. +5 位作者 Reed D.Gurchiek Patricio A.Pincheira Akshay S.Chaudhari Paul W.Hodges Glen A.Lichtwark Scott L.Delp 《Journal of Sport and Health Science》 SCIE CSCD 2025年第1期97-106,共10页
Background Eccentric training,such as Nordic hamstring exercise(NHE)training,is commonly used as a preventive measure for hamstring strains.Eccentric training is believed to induce lengthening of muscle fascicles and ... Background Eccentric training,such as Nordic hamstring exercise(NHE)training,is commonly used as a preventive measure for hamstring strains.Eccentric training is believed to induce lengthening of muscle fascicles and to be associated with the addition of sarcomeres in series within muscle fibers.However,the difficulty in measuring sarcomere adaptation in human muscles has severely limited information about the precise mechanisms of adaptation.This study addressed this limitation by measuring the multiscale hamstring muscle adaptations in response to 9 weeks of NHE training and 3 weeks of detraining.Methods Twelve participants completed 9 weeks of supervised NHE training,followed by a 3-week detraining period.We assessed biceps femoris long-head(BFlh)muscle fascicle length,sarcomere length,and serial sarcomere number in the central and distal regions of the muscle.Additionally,we measured muscle volume and eccentric strength at baseline,post-training,and post-detraining.Results NHE training over 9 weeks induced significant architectural and strength adaptations in the BFlh muscle.Fascicle length increased by 19%in the central muscle region and 33%in the distal muscle region.NHE also induced increases in serial sarcomere number(25%in the central region and 49%in the distal region).BFlh muscle volume increased by 8%,and knee flexion strength increased by 40%with training.Following 3 weeks of detraining,fascicle length decreased by 12%in the central region and 16%in the distal region along with reductions in serial sarcomere number.Conclusion Nine weeks of NHE training produced substantial,region-specific increases in BFlh muscle fascicle length,muscle volume,and force generation.The direct measurement of sarcomere lengths revealed that the increased fascicle length was accompanied by the addition of sarcomeres in series within the muscle fascicles. 展开更多
关键词 Nordic hamstring exercise Muscle architecture Adaptation
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Muscular activity of hamstrings under attentional focus instructions:an electromyography based study 认领 引用
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作者 Ayse Nur Ay Gul Mustafa Zahid Yildiz 《Translational Exercise Biomedicine》 2025年第4期326-334,共9页
Objectives:The effect of attentional focusing on muscular activities and motor skills has been well established.It is known that internal focusing(on body movement or the action itself)results in increased muscular ac... Objectives:The effect of attentional focusing on muscular activities and motor skills has been well established.It is known that internal focusing(on body movement or the action itself)results in increased muscular activity.However,external focusing(on apparatus or the effect of action)results in decreased motor responses.In this study,the impact of attentional focusing has been investigated by exploring the three major components of hamstrings:the semitendinosus,the semimembranosus and the biceps femoris via EMG activity on 20 amateur football players during leg curl exercises.Methods:To measure muscle activities of the participants,Integrated EMG(IEMG)was calculated on the data’s MVC values.Paired sampled t-tests with Bonferroni correction(α=0.0167)were performed on the average IEMG values to determine if there is a significant difference between participants’muscles activities under various attentional focus conditions.Results:The results showed that the semimembranosus exhibited significantly reduced activity under both external(p=0.0124)and internal focus(p=0.0008),while the semitendinosus displayed a small but non-significant reduction under external focus(p=0.0355>0.0167).The biceps femoris showed no significant motor response regarding change between attentional focus instructions.Conclusions:This study improves understanding of the mind-muscle connection by showing muscle-specific differences in attentional focus effects,with semimembranosus being most responsive. 展开更多
关键词 attentional focus mind-muscle connection electromyography hamstrings
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The effect of hamstring flexibility on peak hamstring muscle strain in sprinting 认领 引用 被引量：6
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作者 Xianglin Wan Feng Qu +2 位作者 William E.Garrett Hui Liu Bing Yu 《Journal of Sport and Health Science》 SCIE CAS 2017年第3期283-289,共7页
Background:The effect of hamstring flexibility on the peak hamstring muscle strains in sprinting,until now,remained unknown,which limited our understanding of risk factors of hamstring muscle strain injury(hamstring i... Background:The effect of hamstring flexibility on the peak hamstring muscle strains in sprinting,until now,remained unknown,which limited our understanding of risk factors of hamstring muscle strain injury(hamstring injury).As a continuation of our previous study,this study was aimed to examine the relationship between hamstring flexibility and peak hamstring muscle strains in sprinting.Methods:Ten male and 10 female college students participated in this study.Hamstring flexibility,isokinetic strength data,three-dimensional(3D)kinematic data in a hamstring isokinetic test,and kinematic data in a sprinting test were collected for each participant.The optimal hamstring muscle lengths and peak hamstring muscle strains in sprinting were determined for each participant.Results:The muscle strain of each of the 3 biarticulated hamstring muscles reached a peak during the late swing phase.Peak hamstring muscle strains were negatively correlated to hamstring flexibility(0.1179 ≤ R2≤ 0.4519,p = 0.001) but not to hip and knee joint positions at the time of peak hamstring muscle strains.Peak hamstring muscle strains were not different for different genders.Peak muscle strains of biceps long head(0.071 ± 0.059) and semitendinosus(0.070 ± 0.055) were significantly greater than that of semimembranosus(0.064 ± 0.054).Conclusion:A potential for hamstring injury exists during the late swing phase of sprinting.Peak hamstring muscle strains in sprinting are negatively correlated to hamstring flexibility across individuals.The magnitude of peak muscle strains is different among hamstring muscles in sprinting,which may explain the different injury rate among hamstring muscles. 展开更多
关键词 Hamstring flexibility Hamstring muscle strain injury Injury risk factor Muscle biomechanics Muscle strain Muscle strain injury
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Injury rate,mechanism,and risk factors of hamstring strain injuries in sports:A review of the literature 认领 引用 被引量：15
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作者 Hui Liu William E.Garrett +1 位作者 Claude T.Moorman Bing Yu 《Journal of Sport and Health Science》 SCIE CAS 2012年第2期92-101,共10页
Hamstring strains are one of most common sports injuries.The purpose of this literature review is to summarize studies on hamstring strain injury rate,mechanism,and risk factors in the last several decades with a focu... Hamstring strains are one of most common sports injuries.The purpose of this literature review is to summarize studies on hamstring strain injury rate,mechanism,and risk factors in the last several decades with a focus on the prevention and rehabilitation of this injury.Hamstring injury commonly occurs in sporting events in which high speed sprinting and kicking are frequently performed,such as Australian football. English rugby,American football,and soccer.Basic science studies have demonstrated that a muscle strain injury occurs due to excessive strain in eccentric contraction instead of force,and that elongation speed and duration of activation before eccentric contraction affect the severity of the injury.Hamstring strain injury is likely to occur during the late swing phase and late stance phase of sprint running.Shortened optimum muscle length,lack of muscle flexibility,strength imbalance,insufficient warm-up,fatigue,lower back injury,poor lumbar posture,and increased muscle neural tension have been identified as modifiable risk factors while muscle compositions,age,race,and previous injuries are non-modifiable risk factors.The theoretical basis of some of these risk factors,however,is lacking,and the results of clinical studies on these risk factors are inconsistent.Future studies are needed to establish the cause-and-effect relationships between those proposed risk factors and the injury. 展开更多
关键词 Hamstring injury Mechanism Prevention Rehabilitation Sport medicine
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Effects of flexibility and strength training on peak hamstring musculotendinous strains during sprinting 认领 引用 被引量：8
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作者 Xianglin Wan Shangxiao Li +3 位作者 Thomas M.Best Hui Liu Hanjun Li Bing Yu 《Journal of Sport and Health Science》 SCIE CAS CSCD 2021年第2期222-229,共8页
Background:Hamstring injury is one of the most common injuries in sports involving sprinting.Hamstring flexibility and strength are often considered to be modifiable risk factors in hamstring injury.Understanding the ... Background:Hamstring injury is one of the most common injuries in sports involving sprinting.Hamstring flexibility and strength are often considered to be modifiable risk factors in hamstring injury.Understanding the effects of hamstring flexibility or strength training on the biomechanics of the hamstring muscles during sprinting could assist in improving prevention strategies and rehabilitation related to these injuries.The purpose of this study was to determine the effects of altering hamstring flexibility or strength on peak hamstring musculotendinous strain during sprinting.Methods:A total of 20 male college students(aged 18-24 years)participated and were randomly assigned to either a flexibility intervention group or a strength intervention group.Each participant executed exercise training 3 times a week for 8 weeks.Flexibility,sprinting,and isokinetic strength testing were performed before and after the 2 interventions.Paired t tests were performed to determine hamstring flexibility or strength intervention effects on optimal hamstring musculotendinous lengths and peak hamstring musculotendinous strains during sprinting.Results:Participants in the flexibility intervention group significantly increased the optimal musculotendinous lengths of the semimembranosus and biceps long head(p<0.026)and decreased peak musculotendinous strains in all 3 bi-articulate hamstring muscles(p<0.004).Participants in the strength-intervention group significantly increased the optimal musculotendinous lengths of all 3 hamstring muscles(p<0.041)and significantly decreased their peak musculotendinous strain during sprinting(p<0.017).Conclusion:Increasing hamstring flexibility or strength through exercise training may assist in reducing the risk of hamstring injury during sprinting for recreational male athletes. 展开更多
关键词 Hamstring injury Injury mechanism Injury prevention Modifiable risk factors Muscle biomechanics
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A Single Bundle Anterior Cruciate Ligament Reconstruction (ACL-R) Using Hamstring Tendon Autograft and Tibialis Anterior Tendon Allograft:A Comparative Study 认领 引用 被引量：5
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作者 Saroj Rai Sheng-yang JIN +5 位作者 Bimal RAI Nira TAMANG Wei HUANG Xian-zhe LIU Chun-qing MENG Hong WANG 《Current Medical Science》 SCIE CAS 2018年第5期818-826,共9页
The main purpose of this study patients undergoing a single bundle anterior was to compare the clinical outcomes of cruciate ligament reconstruction (ACL-R) of using quadrupled hamstring (4HT)autografts and two-strand... The main purpose of this study patients undergoing a single bundle anterior was to compare the clinical outcomes of cruciate ligament reconstruction (ACL-R) of using quadrupled hamstring (4HT)autografts and two-strand tibialis anterior (2TA) aUografts,and to find out the rate of graft failure and possible causes.We hypothesized that there would be no difference in the clinical outcome,and graft failure would be associated with the use of small sized allograft in young active males with high demand of sports activities.We retrospectively evaluated 222 patients (male,n=167,female,n=55) undergoing ACL-R between January 2010 and July 2014.Of 222 patients,115 were included in the 4HT autograft group and 107 patients in the 2TA allograft group.Inclusion criteria were primary unilateral ACL-R with a minor MCL (<grade Ⅱ)injury with or without meniscus tear and had at least 2.5 years of follow-up.Subjective evaluation was performed using Tegner-Lysholm score,modified Cincinnati knee score,and IKDC knee form.Anteroposterior laxity was assessed using ADT and Lachman test whereas rotational laxity was assessed using pivot shift test.Similarly,functional assessment was performed using range of motion (ROM),Daniel's one-leg hop test,and overall IKDC score.Clinical outcomes were satisfactory and comparable in both groups with no statistically significant difference in all the respective parameters.No statistically significant difference was observed in graft re-rupture rate.However,most graft failures occurred in young active males with high demand of sports activities,graft size smaller than 8 mm,and use of allograft.An autograft with at least 8 mm diameter should be considered in a young active male with high demand of sports activities to avoid graft failure. 展开更多
关键词 anterior cruciate ligament reconstruction autograft allograft hamstring tendon tibialis anterior tendon
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Arthroscopic Reconstruction of the Posterior Cruciate Ligament with a Ligament-advanced Reinforcement System and Hamstring Tendon Autograft:A Retrospective Study 认领 引用 被引量：6
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作者 Yang LUO Zhi-gang WANG +1 位作者 Zhi-jiang LI Min WEI 《Current Medical Science》 SCIE CAS 2021年第5期930-935,共6页
Objective:Both ligament-advanced reinforcement system(LARS)and hamstring tendon autograft can serve as grafts for posterior cruciate ligament(PCL)reconstruction.However,few studies have compared the effectiveness of t... Objective:Both ligament-advanced reinforcement system(LARS)and hamstring tendon autograft can serve as grafts for posterior cruciate ligament(PCL)reconstruction.However,few studies have compared the effectiveness of these two approaches.This study therefore aimed to compare the clinical efficacy of arthroscopic reconstruction of the PCL using either the LARS or hamstring tendon autograft.Methods:A total of 36 patients who underwent PCL reconstruction were retrospectively analyzed.Within this cohort,15 patients received a reconstruction using the LARS(LARS group)and 21 using the hamstring tendon autograft(HT group).Results:The pre-and post-operative subjective scores and knee stability were evaluated and the patients were followed up for a period of 2 to 10.5 years(4.11±2.0 years on average).The last follow-up showed that functional scores and knee stability were significantly improved in both groups(P0.05).In the LARS and HT groups,12 and 9 patients,respectively exhibited KT1000 values<3 mm,with the difference being statistically significant(P<0.05).In the HT group,the diameter of the four-strand hamstring tendon was positively correlated with height(P<0.05),which was 7.37±0.52 mm in males and 6.50±0.77 mm in females(P<0.05).Conclusion:Both LARS and hamstring tendon approaches achieved good efficacy for PCL reconstruction,but patients in the LARS group exhibited faster functional recovery and better knee stability in the long term.LARS is especially suitable for those who hope to resume activities as early as possible. 展开更多
关键词 posterior cruciate ligament ligament-advanced reinforcement system hamstring tendon reconstruction
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Nordic Hamstring跪姿前倾离心训练的生理效应及其对腘绳肌拉伤的预防效果 认领 引用 被引量：7
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作者 谭恺 张春合 吕海龙 《中国运动医学杂志》 CAS CSCD 北大核心 2019年第7期601-610,共10页
腘绳肌拉伤是足球运动中高发生率和高复发率的非接触损伤之一。近些年来,Nordic Hamstring跪姿前倾离心训练(下称NH训练)以其形式简单且无器械设备要求的特点,成为备受关注的预防腘绳肌拉伤的干预手段。研究表明,NH训练能选择性募集并... 腘绳肌拉伤是足球运动中高发生率和高复发率的非接触损伤之一。近些年来,Nordic Hamstring跪姿前倾离心训练(下称NH训练)以其形式简单且无器械设备要求的特点,成为备受关注的预防腘绳肌拉伤的干预手段。研究表明,NH训练能选择性募集并强化半腱肌和股二头肌短头,提高腘绳肌屈膝离心肌力并增加股二头肌长头肌束长度,但对股二头肌长头募集不足,难以强化最易产生拉伤的股二头肌长头。在一定依从性前提下,NH训练对低龄(低于27岁)且无拉伤史的低风险球员腘绳肌拉伤具有预防效果,对高龄或有拉伤史的高风险球员则无预防效果,原因在于NH训练的生理效应仅能改善低风险球员的主要危险因素。建议开展对我国足球运动员的NH干预研究,优化针对低风险球员的NH训练方案,并设计针对高风险球员的预防干预;同时,进一步探索NH训练的生理效应、腘绳肌的募集模式以及离心训练的适应机制。 展开更多
关键词 Nordic Hamstring 离心训练 腘绳肌拉伤 足球 预防 危险因素 选择性募集 形态结构适应
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Hamstring autograft utilization in reconstructing anterior cruciate ligament:Review of harvesting techniques,graft preparation,and different fixation methods 认领 引用 被引量：2
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作者 Waleed Albishi Baraa Baltow +2 位作者 Nora Albusayes Ameer A Sayed Hamza M Alrabai 《World Journal of Orthopedics》 2022年第10期876-890,共15页
Rupture of the anterior cruciate ligament(ACL)is a common orthopedic injury.Various graft options are available for the reconstruction of ruptured ACL.Using the hamstring muscle as an autograft was first described in ... Rupture of the anterior cruciate ligament(ACL)is a common orthopedic injury.Various graft options are available for the reconstruction of ruptured ACL.Using the hamstring muscle as an autograft was first described in 1934,and it remains a commonly harvested graft for ACL reconstruction.Hamstring autografts can be harvested using the traditional anteromedial approach or the newer posteromedial technique.An isolated semitendinosus tendon can be used or combined with the gracilis tendon.There are numerous methods for graft fixation,such as intra-tunnel or extra-tunnel fixation.This comprehensive review discusses the different hamstring muscle harvesting techniques and graft preparation options and fixation methods.It provides a comprehensive overview for choosing the optimal surgical technique when treating patients. 展开更多
关键词 Anterior cruciate ligament Anterior cruciate ligament reconstruction Graft fixation Hamstring autograft Infrapatellar nerve injury Patient reported outcomes
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自体Hamstring腱重建前交叉韧带术后关节镜下再视观察 认领 引用 被引量：4
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作者 夏春 周江南 +1 位作者 付日斌 陈国能 《中国微创外科杂志》 2005年第12期1006-1008,共3页
目的关节镜再视观察游离Hamstring腱重建前交叉韧带后在体内重塑与转归过程.方法关节镜下再视手术,观察关节镜下自体同侧游离Hamstring腱重建前交叉韧带33例.重建术至再视手术时间为2～36个月,平均11.9月.依据重建术至再视术的时间,替... 目的关节镜再视观察游离Hamstring腱重建前交叉韧带后在体内重塑与转归过程.方法关节镜下再视手术,观察关节镜下自体同侧游离Hamstring腱重建前交叉韧带33例.重建术至再视手术时间为2～36个月,平均11.9月.依据重建术至再视术的时间,替代腱按时段分组:1月～,4月～,7月～,10月～,13月～,18月～和25月～组.再视术重点观察评估了移植的Hamstring腱形状、色泽、张力、覆盖的滑漠组织和血管状况.结果再视关节镜下重建前交叉韧带的Hamstring腱随植入时间延长,其形态逐步向正常前交叉韧带重塑与转归;7月～组和此后各组的替代腱在关节镜视下表现为.一种几乎无滑膜和血管的灰白色粗壮的圆柱体,类似于正常的前交叉韧带组织,达到了在体内成熟的程度.结论自体游离多股Hamstring腱重建前交叉韧带术后具有良好早期存活,快速再血管化和重塑过程,其术后的重塑与成熟过程与自体髌腱的过程相似,但其在体内重塑与转归进程相对较快. 展开更多
关键词 自体Hamstring腱 前交叉韧带重建术后 关节镜 重塑与成熟
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Risk factors for hamstring injuries in Australian male professional cricket players 认领 引用 被引量：1
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作者 John W.Orchard Alex Kountouris Kevin Sims 《Journal of Sport and Health Science》 SCIE CAS 2017年第3期271-274,共4页
Background:Injuries to the hamstring are relatively common in professional cricketers(as they are in many team sports) and have increased in incidence in the "T20 era"(introduction of 20-over matches) of cri... Background:Injuries to the hamstring are relatively common in professional cricketers(as they are in many team sports) and have increased in incidence in the "T20 era"(introduction of 20-over matches) of cricket since 2006.Methods:This study analyzed incidence of hamstring injury in the various elite male match types over a 20-year period(1995–1996 to 2014–2015seasons).Risk factors for hamstring strain were assessed using a multivariate logistic regression analysis technique.Results:There were 276 match time-loss hamstring injuries recorded over a 20-year period at the Australian state or national player level,of which170 occurred in one of 40,145 player match sets.The overall rate of match onset rate was 22.5 hamstring injuries per 1000 team days.Fast bowling onset injuries were the highest subcategory at a rate of 10.9 injuries per 1000 team days,although batting onset injuries were particularly common in 50-over(one day) international matches.Significant risk factors in logistic regression analysis,in addition to hamstring injury history,were being a fast bowler relative risk(RR) 2.5(95% confidence interval(CI):1.3–4.5) and playing a match in Australia RR 2.3(95%CI:1.3–3.9).Conclusion:Fast bowlers suffer more hamstring injuries than other playing roles in cricket,particularly in First Class(multi-day) cricket.Batsmen are more likely to get injured in 50-over(one day) cricket.Playing in Australia(compared to overseas venues) leads to increased risk of hamstring injury. 展开更多
关键词 Cricket Fast bowling Fielding Hamstring strains Muscle strains Sprinting
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Role of age in the prediction of hamstring autograft size in anterior cruciate ligament reconstruction 认领 引用
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作者 Zhilin Liu Jingyu Gao +4 位作者 Gang Yu Yingming Wang Chengyuan Yan Rui Zhong Qichun Zhao 《中国科学技术大学学报》 CAS CSCD 北大核心 2024年第12期1-6,I0001,I0008,共6页
Objective:While age has been recognized as a noteworthy factor in preoperative graft selection,the correlation between age and hamstring autograft diameter has been the subject of continued debate within the scientifi... Objective:While age has been recognized as a noteworthy factor in preoperative graft selection,the correlation between age and hamstring autograft diameter has been the subject of continued debate within the scientific community.This study aimed to explore the correlation between the diameter of autologous tendon grafts and age in anterior cruciate ligament reconstruction(ACLR).Methods:A retrospective review of 388 patients who underwent arthroscopic ACLR with hamstring autografts was performed.Patients were grouped by age to analyze differences in hamstring autograft dia-meter and tendon cross-sectional area(CSA).We explored the correlations between age and graft diameter and between age and the CSA of the popliteal tendon while controlling for the influence of other pertinent variables.Results:Compared with female patients,male patients presented significantly greater autograft diameters and hamstring tendon CSAs(P32 years were substantially more likely to have a graft diameter exceeding 8 mm and a CSA surpassing 18.5 mm2 than their≤32-year-old counterparts were(P<0.05).Conclusion:This study revealed that graft diameter varies across different age groups,with age independently influencing graft diameter. 展开更多
关键词 anterior cruciate ligament reconstruction(ACLR) age hamstring autograft graft size MRI preoperative planning
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Research in prevention and rehabilitation of hamstring muscle strain injury 认领 引用 被引量：1
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作者 Bing Yu Li Li 《Journal of Sport and Health Science》 SCIE CAS 2017年第3期253-254,共2页
Hamstring muscle strain injury is the most common and prevalent injury in sports involving high-speed running,such as American football,Australian football,English rugby,soccer,track and field,and cricket.1Hamstring m... Hamstring muscle strain injury is the most common and prevalent injury in sports involving high-speed running,such as American football,Australian football,English rugby,soccer,track and field,and cricket.1Hamstring muscle strain injury also has a high recurrence rate of up to 48%.2The average practice and game time loss due to hamstring injury is between17 and 60 days,contingent on the grade of injury.2Severe hamstring muscle strain injuries,and associated recurrent inju- 展开更多
关键词 Research in prevention and rehabilitation of hamstring muscle strain injury
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MRI Observations of Patellar Tendon Length Change after ACL Reconstruction with Hamstring Autografts 认领 引用
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作者 李皓桓 张小龙 +3 位作者 Gota Ooi Numazaki Hironori Miho Sekiguchi Shin-ichi Konno 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 2017年第4期577-581,共5页
The post-operative patellar tendon length was studied to evaluate the possible tendon length change after anterior cruciate ligament（ACL） reconstruction with hamstring autografts. The Insall-Salvati index, modified ... The post-operative patellar tendon length was studied to evaluate the possible tendon length change after anterior cruciate ligament（ACL） reconstruction with hamstring autografts. The Insall-Salvati index, modified Insall-Salvati index, curved modified Insall-Salvati index and Caton-Deschamps index were observed by MRI during a follow-up period of 12 weeks on 20 ACL reconstructed knees. The results showed no patellar baja or alta pre-existed on those ACL injured patients. After a follow-up period of 12 weeks, no patellar tendon length change was observed. It is suggested that the change of patella was not the primary reason that may contribute to the premature patellofemoral joint osteoarthritis after ACL reconstruction. 展开更多
关键词 patellar tendon hamstrings anterior cruciate ligament reconstruction
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Reconstruction of the Medial Patellofemoral Ligament Using Hamstring Tendon Graft With Different Methods:a Biomechanical Study 认领 引用 被引量：1
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作者 Wei He Yu-ming Yang +2 位作者 Ming Liu Ai-yuan Wang Yu-jie Liu 《Chinese Medical Sciences Journal》 CAS CSCD 2013年第4期201-205,共5页
Objective To measure the tensile strength of the normal medial patellofemoral ligament(MPFL),and evaluate the biomechanics of different fixation methods of the hamstring tendon graft on the patella.Methods Eight fresh... Objective To measure the tensile strength of the normal medial patellofemoral ligament(MPFL),and evaluate the biomechanics of different fixation methods of the hamstring tendon graft on the patella.Methods Eight fresh cadaver knees were prepared by isolating the patella,leaving only the MPFL as its attachment to the medial condyle of femur.The MPFL was reconstructed by three different methods:four-suture fixation,anchors-single suture fixation,and anchors-double suture fixation.The tensile strength and the elongation of the normal MPFL and the tendon grafts were measured.Results The tensile strength of the four-suture fixation group(234.86±49.02 N)was stronger than that of the normal MPFL(146.91±25.30 N,P=0.0014)and the anchors-single suture group(159.17±49.07N,P=0.0077),while weaker than that of the anchors-double suture group(314.74±78.46 N,P=0.0052)Conclusions With regard to the tensile strength,the four-suture fixation method is reliable for clinical use.Compared with the anchor-suture method,the four-suture fixation method which has no specific implants is more economical,convenient and efficient. 展开更多
关键词 medial patellofemoral ligament biomechanics fixation method hamstring tendons
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The Effect of Stretching Hamstring, Gastrocnemius, Iliopsoas and Back Muscles on Pain and Functional Activities in Patients with Chronic Low Back Pain: A Randomized Clinical Trial 认领 引用 被引量：2
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作者 Hamada E. Seif Aqeel Alenazi +2 位作者 Sahar Mahmoud Hassan Shaji John Kachanathu Ashraf R. Hafez 《Open Journal of Therapy and Rehabilitation》 2015年第4期139-145,共7页
A back pain lasting more than 12 weeks has been defined as a chronic low back pain (LBP) [1]. More than half of people suffer from LBP [1]. The purpose of this study was to examine the effect of gastrocnemius muscle s... A back pain lasting more than 12 weeks has been defined as a chronic low back pain (LBP) [1]. More than half of people suffer from LBP [1]. The purpose of this study was to examine the effect of gastrocnemius muscle stretching in the treatment of chronic low back pain. Methods: Forty patients with chronic low back pain, ages ranging from 25 to 40 years, were recruited and divided randomly into two groups. The control group followed a physical therapy program that included stretching exercises for back, hamstring and iliopsoas muscles. Strengthening exercises for abdominal muscle and postural instructions for activities of daily living were also performed. The experimental group followed the same control-group exercises with the addition of stretching exercises for gastrocnemius muscles. The interventions for both groups consisted of three sessions per week for six weeks, each session lasting for an hour. The outcome measures were visual analog scale (VAS) for pain severity, modified fingertip to floor (FTF) for range of motion (ROM) of trunk flexion, Oswestry Disability Index (ODI), and loading X-ray to detect lumbosacral angle. Results: There was no significant difference between groups at baseline characteristics. At final follow up, the two groups were significantly different in all outcome measures in terms of pain (p p p p < 0.01). Conclusion: Gastrocnemius manual stretching exercise is more beneficial in reducing pain and improving functions for patients with chronic low back pain when adding to stretching exercises for hamstring, iliopsoas, and back muscles, and strengthening exercise for abdominal muscles. 展开更多
关键词 Mechanical Back Pain Back Pain Syndromes Hamstring Muscle Hip Motion Lumbar Motion Pos-ture Gastrocnemius Muscle
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Five Strand Hamstring Tendon Autograft for Anterior Cruciate Ligament Reconstruction Provides No Benefit over the Gold Standard Four Strand Repair for Anterior Stability of the Knee: A Prospective Cohort Study 认领 引用 被引量：1
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作者 A.Sideris A.Hamze +2 位作者 N.Bertollo D.Broe WR Walsh 《Open Journal of Orthopedics》 2017年第6期156-172,共17页
The Four-Strand Hamstring Tendon Autograft has been long established as the gold standard for surgical reconstruction of the Anterior Cruciate Ligament. Some studies have suggested wider grafts, such as a Five-Strand ... The Four-Strand Hamstring Tendon Autograft has been long established as the gold standard for surgical reconstruction of the Anterior Cruciate Ligament. Some studies have suggested wider grafts, such as a Five-Strand hamstring graft, may provide greater strength and a larger scaffold for incorporation of the graft into the bone tunnels, leading to greater postoperative anterior stability of the knee. 28 (n = 18 Four-Strand and n = 10 Five-Strand) patients with planned ACL reconstructive surgery by a single surgeon were recruited for this study. The KT-1000 Arthrometer (MED metric, CA, USA) was used to quantify AP translation in the subjects’ knees before (T0) and after surgery at 6 (T1) and 12 (T2) weeks. At 12 weeks there was significantly higher (p = 0.01) mean anterior laxity on Maximum Manual Test in the Five- Strand group (9.1 ± 1.7 mm) than the Four Strand Group (6.9 ± 2.3 mm). Further, there were significantly higher mean side-to-side differences (p = 0.01) on Maximum Manual Test in the Five-Strand cohort (5.1 ± 3.5 mm) compared to the Four-Strand cohort (1.9 ± 2.2 mm). A significantly larger positive mean change in anterior laxity (p = 0.02) from 6 - 12 weeks was evident in the Five-Strand group (1.4 ± 0.9) than the Four-Strand group (-0.3 ± 1.9 mm). No significant correlations were seen between graft widths and measures of anterior stability on KT-1000. This study illustrated that there was no benefit to using a Five-Strand Hamstring Tendon Autograft when compared to the gold standard Four-Strand Repair specifically with regards to anterior stability of the knee. 展开更多
关键词 Anterior Cruciate Ligament ACL Anterior Cruciate Ligament Reconstructive Surgery Anterior Cruciate Ligament Reconstruction ACL Reconstruction Five Strand Hamstring Tendon Autograft Four Strand Hamstring Tendon Autograft KT-1000 AP Translation Knee
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