优秀运动员股四头肌、腘绳肌等速测定正常值的研究   总被引：2，自引：0，他引：2  

杨静宜  孙卫星  王伟平  陆一帆  周英男  李国盛  谭赓  赖柳明 《北京体育大学学报》1991,(3)

为在运动员选材、安排训练计划、预防运动损伤与康复中使用BIODEX多关节测力及康复系统测定结果提供参考数据,测定了200名男、女运动员及20名男、女大学生的膝关节屈、伸肌群力量.其中共采用了最大力矩等8项指标,为其中6项制定了运动员"评价表格".研究中发现,过去有大腿肌肉拉伤和膝关节损伤史的运动员,并不存在长期性肌力不平衡;股四头肌最大发力角度不同于曲绵域等人过去的报导.提出了某些专项运动员在肌力方面的特点及弱点,可供教练员、运动员参考.  相似文献   

信息化助推区域常态化教研浅析     

牟筱敏 《台州学院学报》2013,(5):82-83,93

构建联片教研信息网络,能打破时空制约,实现区域内教师研训常态化,让区域内教师享有均等的参与机会,发挥主动参与热情,使优质教育资源发挥更大效益。具体实践中需要搭建好一个平台;建构包括版主管理、课题管理、研训积分、教研信息反馈等在内的一整套制度;把握好技能培训、案例生成、反思研讨、交流展示、专家指导、总结提高六个环节。  相似文献   

基于ArcGIS的多温区冷藏车辆路径优化     

陈婧怡  邱荣祖 《上海海事大学学报》2019,40(1):8-13

为降低冷链物流成本,研究多温共配模式下生鲜农产品冷链配送问题。采用多温区冷藏车,构建考虑运输成本、货损成本、制冷成本的路径优化模型,利用遗传算法对算例进行求解,借助ArcGIS规划最短路径。算例结果显示,与传统配送模式相比,多温共配模式可减少2辆冷藏车的调度,总成本降低34. 1%,实际运输距离缩短54. 1%。多温共配模式可有效解决生鲜农产品配送小批量、多品种、高成本的问题。  相似文献   

Leg amputation side determines performance in curve sprinting: a case study on a Paralympic medalist     

Johannes Funken  Kai Heinrich  Steffen Willwacher  Ralf Müller  Jonas Böcker  Hiroaki Hobara 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(1):75-87

The lower limb kinetics of curve sprinting in amputees are not well described in the literature, particularly with respect to the effect of the side of amputation. This is an issue due to the importance of the knowledge for prosthetic design and classification of athletes. Thus, the aim of this study was to investigate the influence of side of amputation on curve sprinting performance in athletes with a unilateral leg amputation. A three-dimensional motion analysis system (Vicon), four force plates (Kistler) and a modified mathematical human model (ALASKA) were used to compare clockwise and counter clockwise curve sprinting lower limb kinematics and kinetics of a Paralympic medalist with a left-sided knee exarticular amputation. Results reveal that vertical ground reaction force application and total vertical impulse were lower when the affected limb was at the inside of the curve. The unaffected limb showed joint mechanics different to those established for non-amputee athletes and might contribute better to propulsion when being the inside limb. Curve sprinting biomechanics and the ability to attain high radial velocities are directly dependent on the side of amputation relative to the curve direction in a unilateral amputee athlete of highest performance level.  相似文献   

The influence of water depth on kinematic and spatiotemporal gait parameters during aquatic treadmill walking     

Taeyou Jung  Yumi Kim  Hyosok Lim  Konstantinos Vrongistinos 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(3):297-307

The purpose of this study was to investigate kinematic and spatiotemporal variables of aquatic treadmill walking at three different water depths. A total of 15 healthy individuals completed three two-minute walking trials at three different water depths. The aquatic treadmill walking was conducted at waist-depth, chest-depth and neck-depth, while a customised 3-D underwater motion analysis system captured their walking. Each participant’s self-selected walking speed at the waist level was used as a reference speed, which was applied to the remaining two test conditions. A repeated measures ANOVA showed statistically significant differences among the three walking conditions in stride length, cadence, peak hip extension, hip range of motion (ROM), peak ankle plantar flexion and ankle ROM (All p values < 0.05). The participants walked with increased stride length and decreased cadence during neck level as compared to waist and chest level. They also showed increased ankle ROM and decreased hip ROM as the water depth rose from waist and chest to the neck level. However, our study found no significant difference between waist and chest level water in all variables. Hydrodynamics, such as buoyancy and drag force, in response to changes in water depths, can affect gait patterns during aquatic treadmill walking.  相似文献   

Corticospinal changes induced by fatiguing eccentric versus concentric exercise     

Yoann M. Garnier  Christos Paizis  Romuald Lepers 《European Journal of Sport Science》2019,19(2):166-176

The present study assessed neuromuscular and corticospinal changes during and after a fatiguing submaximal exercise of the knee extensors in different modes of muscle contraction. Twelve subjects performed two knee extensors exercises in a concentric or eccentric mode, at the same torque and with a similar total impulse. Exercises consisted of 10 sets of 10 repetitions at an intensity of 80% of the maximal voluntary isometric contraction torque (MVIC). MVIC, maximal voluntary activation level (VAL) and responses of electrically evoked contractions of the knee extensors were assessed before and after exercise. Motor evoked potential amplitude (MEP) and cortical silent period (CSP) of the vastus medialis (VM) and rectus femoris (RF) muscles were assessed before, during and after exercise. Similar reductions of the MVIC (?13%), VAL (?12%) and a decrease in the peak twitch (?12%) were observed after both exercises. For both VM and RF muscles, MEP amplitude remained unchanged during either concentric or eccentric exercises. No change of the MEP amplitude input–output curves was observed post-exercise. For the RF muscle, CSP increased during the concentric exercise and remained lengthened after this exercise. For the VM muscle, CSP was reduced after the eccentric exercise only. For a similar amount of total impulse, concentric and eccentric knee extensor contractions led to similar exercise-induced neuromuscular response changes. For the two muscles investigated, no modulation of corticospinal excitability was observed during or after either concentric or eccentric exercises. However, intracortical inhibition showed significant modulations during and after exercise.  相似文献   

网络图书馆：网络环境下资源共享的新理念     

肖乃菲 《大学图书情报学刊》2008,26(5):6-9

网络图书馆是在自愿、互利原则基础上,基于图书馆联盟合作的深入发展并依附一定的网络环境,组建而成的共建共知共享知识体系。文章阐述了网络信息资源共建共知共享的新理念,简要分析了网络图书馆资源共建共知共享的内容。  相似文献   

云南省高校图书馆外文网络电子资源共建共享的理论与实践     

杨丽娟 《大学图书情报学刊》2008,26(6):44-49

从实现高校电子资源共建共享的角度探讨信息资源共建共享理论,阐述了云南省高校图书馆外文网络电子资源共建共享的组织与实施,并分析研究了云南省高校图书馆外文网络电子资源共建共享的模式和使用效益。  相似文献   

《学记》之论教师及其现实意义     

任艳红 《山西广播电视大学学报》2004,9(2):91-92

《学记》是中国古代教育文献中最早、体系比较严整而又有价值的一篇,它在系统论述教学原则、方法的同时,对教师的地位、作用,以及对教师的要求进行了阐述,这些有价值的观念和成功的经验,经过实践证明,是行之有效的。  相似文献   

联合变换相关识别三维物体     

王海霞  张星 《洛阳师范学院学报》2008,27(5)

将一正弦条纹分别投影到参考物体和待测物体表面,得到参考物体的变形条纹图像和待识别物体的变形条纹图像。以此变形条纹作为联合变化相关的输入图像,通过联合变换相关,得到自相关和互相关输出,最后根据输出的相关峰大小即可判别不同的物体。用Matlab软件编程实现三维物体联合变换相关识别,并且验证了联合变换相关识别物体具有平移不变性。  相似文献