Acute and chronic effects of foam rolling vs eccentric exercise on ROM and force output of the plantar flexors     

Anne A. G. Aune  Chris Bishop  Anthony N. Turner  Kostas Papadopoulos  Sarah Budd  Mark Richardson 《Journal of sports sciences》2019,37(2):138-145

Foam rolling and eccentric exercise interventions have been demonstrated to improve range of motion (ROM). However, these two modalities have not been directly compared. Twenty-three academy soccer players (age: 18 ± 1; height: 1.74 ± 0.08 m; body mass: 69.3 ± 7.5 kg) were randomly allocated to either a foam rolling (FR) or eccentric exercise intervention designed to improve dorsiflexion ROM. Participants performed the intervention daily for a duration of four weeks. Measurements of dorsiflexion ROM, isometric plantar flexion torque and drop jump reactive strength index were taken at baseline (pre-intervention) and at three subsequent time-points (30-min post, 24-hours post and 4-weeks post). A significant time x group interaction effect was observed for dorsiflexion (P = 0.036), but not for torque or reactive strength index. For dorsiflexion, there was a significant increase in both acute (30-min; P < 0.001) and chronic (4-week; P < 0.001) ROM for the eccentric group, whilst FR exhibited only an acute improvement (P < 0.001). Eccentric training would appear a more efficacious modality than foam rolling for improving dorsiflexion ROM in elite academy soccer players.  相似文献   

论“踝角”变化对速滑运动员滑跑速度的影响     

艾东明 《沈阳体育学院学报》2010,29(1):78-80

运用运动力学方法,从解剖学角度对滑行姿势中踝关节最小角度范围进行分析。认为较小的踝关节角度有利于提高蹬冰效果、增大滑行水平速度;并实际分析当前运动员踝角过大的成因,提出具体解决办法,为运动员及教练员重视踝角在滑行技术中的作用提供理论依据。  相似文献   

论普通高校排球项目踝关节力量训练的重要性     

杨枝创 《体育科技》2012,33(3):47-49

通过分析排球运动的技术特征,踝关节的生理结构和运动特征以及踝关节运动损伤的机制及原因,阐述踝关节力量训练的重要性。  相似文献   

中药熏蒸疗法治疗青少年足球运动员踝前撞击综合征的疗效观察          下载免费PDF全文

谢施海  彭海东  李峻  张申  曾贵刚 《体育科研》2013,(3):84-86

目的：观察中药熏蒸疗法对青少年足球运动员踝前撞击综合征的疗效。方法：将24例患者随即分为对照组、理疗组及中药熏蒸组,每组8例。对照组不做处理;理疗组采用超短波治疗,每次治疗30min,每日1次,治疗10次;中药熏蒸组采用中药熏蒸,每次治疗30min,每日1次,治疗10次。疗效评价采用AOFASY足踝评分和Myotonometer测试系统检测踝关节肿胀,结果：理疗组和中药熏蒸组的治疗都有效（P〈0．05）,但中药熏蒸组的疗效更好（P〈0．05）：结论：理疗纽和中药熏蒸组的治疗效果较对照组有明显疗效,其中中药熏蒸组的疗效更好,  相似文献   

Kinematic and kinetic differences in the execution of vertical jumps between people with good and poor ankle joint dorsiflexion     

Georgios Papaiakovou 《Journal of sports sciences》2013,31(16):1789-1796

Abstract

The aim of the present study was to investigate the kinematic and kinetic differences in the execution of vertical jumps between individuals with good and poor ankle dorsiflexion. Fifteen physical education students were assigned to the flexible group (FG), while another 15 were assigned to the inflexible group (IFG). The two groups executed countermovement jumps (CMJ) and drop jumps from a 60 cm height (DJ60). For the CMJ, the FG jumped higher (32.0 ± 4.0 cm vs. 30.2 ± 4.9 cm, P = 0.27) and used a greater range of motion in all leg joints. The IFG jumpers raised their heels off the ground and had a greater horizontal distance between the centre of mass of the trunk and the centre of the hip joint (L_CMh 25.6 ± 3.4 cm vs. 30.9 ± 4.3 cm, P < 0.001). In the DJ60 the FG jumped higher (22.4 ± 5.9 cm vs. 19.5 ± 4.6 cm, P = 0.14) with a greater vertical shift of the body centre of mass (BCM) (S = 0.45 ± 0.11 cm vs. 0.36 ± 0.05 cm, P < 0.01) and better joint coordination. The IFG jumpers changed the position of their trunk and heels depending on the jump type. Trainers should reconsider the technical issues of vertical jumps according to the flexibility of the ankle joint.  相似文献   

Increased delivery stride length places greater loads on the ankle joint in elite male cricket fast bowlers     

Wayne Spratford  Amy Hicks 《Journal of sports sciences》2013,31(12):1101-1109

Abstract

The purpose of this study was to investigate the effect stride length has on ankle biomechanics of the leading leg with reference to the potential risk of injury in cricket fast bowlers. Ankle joint kinematic and kinetic data were collected from 51 male fast bowlers during the stance phase of the final delivery stride. The bowling cohort comprised national under-19, first class and international-level athletes. Bowlers were placed into either Short, Average or Long groups based on final stride length, allowing statistical differences to be measured. A multivariate analysis of variance with a Bonferroni post-hoc correction (α = 0.05) revealed significant differences between peak plantarflexion angles (Short-Long P = 0.005, Average and Long P = 0.04) and negative joint work (Average-Long P = 0.026). This study highlighted that during fast bowling the ankle joint of the leading leg experiences high forces under wide ranges of movement. As stride length increases, greater amounts of negative work and plantarflexion are experienced. These increases place greater loads on the ankle joint and move the foot into positions that make it more susceptible to injuries such as posterior impingement syndrome.  相似文献   

The effect of increasing external degrees of freedom on force production and neuromuscular stabilisation     

Kati Wuebbenhorst  Volker Zschorlich 《Journal of sports sciences》2013,31(14):1561-1569

Abstract

Evidence suggests that during interaction with different environmental dynamics the necessity to stabilise the involved joints leads to altered efficiency in force transmission to the surroundings and a specific orchestration of motor control strategies. However, little is known about the modalities of the changes associated with altered environmental dynamics. In 29 healthy participants, electromyographic (EMG) signals from four muscles of the right leg (M. peroneus longus, M. tibialis anterior, M. vastus medialis, M. gastrocnemius medialis) and three dimensions of force (Fx, Fy, Fz) were recorded. The participants were to exert force against an external object by performing a unilateral leg extension task with the task being influenced by either 0, 1 or 3 mechanical degrees of freedom. We hypothesised that the ankle stabilising muscles would increase their activities with increasing degrees of freedom (DoF), and that increasing external degrees of freedom results in decreased muscle force exerted during the movement task. The progressive change in the type of mechanical interaction from stable to unstable caused a loss of the ability to apply force in movement direction (Fz) which was accompanied by a reduction of Fy and Fx force dimensions. These reductions corresponded to maximum losses of 23% for Fz, 33% for Fx and 41% for Fy in the three degrees of freedom condition (all P < 0.001). Next, the individual muscles showed specific tuning effects, depending on the type of mechanical interaction. Our results suggest that the loss of the ability to exert force effectively against the external object is due to the neuromuscular stabilisation process of the involved joints. The change of the degrees of freedom conditions allowed for assessment of movement- or stabilisation-related adjustments of the motor system.  相似文献   

Control method for exoskeleton ankle with surface electromyography signals     

张震  王震  蒋佳芯  钱晋武 《上海大学学报(英文版)》2009,13(4):270-273

This paper is concerned with a control method for an exoskeleton ankle with electromyography (EMG) signals. The EMG signals of human ankle and the exoskeleton ankle are introduced. Then a control method is proposed to control the exoskeleton ankle using the EMG signals. The feed-forward neural network model applied here is composed of four layers and uses the back-propagation training algorithm. The output signals from neural network are processed by the wavelet transform. Finally the control orders generated from the output signals are passed to the motor controller and drive the exoskeleton to move. Through experiments, the equality of neural network prediction of ankle movement is evaluated by giving the correlation coefficient. It is shown from the experimental results that the proposed method can accurately control the movement of ankle joint. Project supported by the National High-Tech R&D Program (Grant No.2006AA04Z224), the Innovation Program of Shanghai Municipal Education Commission (Grant No.08ZZ48), and the Shanghai Leading Academic Discipline Project (Grant No.Y0102)  相似文献   

优秀女子自行车运动员踝关节肌群等动向心测试研究     

李天白  张兵 《山东体育学院学报》2007,23(4):63-66

利用等动测力系统(Cybex-6000)对10名优秀女子自行车运动员进行踝关节肌力的等动向心测试。研究的结果表明:1)踝关节肌群等动向心收缩时峰力矩及相对峰力矩随运动速度的增加而减少,总功及相对总功随测试速度的增加而减小,而平均功率及相对值随测试速度的增加而增大;2)踝关节前后侧肌力矩相差很大,而且显示出速度的差异性。自行车运动员踝关节肌群的肌力特征,反映了踝关节的肌肉配布与踝关节肌群的训练特征,体现了其合肌肉规律,合肌群特色,合运动实际的规律。  相似文献   

我国速度滑冰优秀男子运动员膝、踝关节肌力特征的比较研究   总被引：6，自引：0，他引：6  

夏娇阳 《体育科学》2005,25(8):53-55,74

通过运用CYBEX NORM多关节等速测力及康复系统对我国男子500m国际级健将和国家级健将速度滑冰运动员下肢膝、踝关节肌力进行测试和分析。结果表明，两组运动员在部分膝、踝关节肌力特征上存在显著性差异，国际级健将运动员表现出较国家级健将运动员更合理的肌力特征。  相似文献