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排序方式: 共有162条查询结果,搜索用时 15 毫秒
1.
Purpose: The main purpose of this study was to investigate the influence of fatigue on musculoarticular stiffness (MAS) of the ankle joint across sexes. Methods: Twenty-seven males and 26 females participated in the study. After baseline assessment of MAS and related variables, localised fatigue was induced in triceps surae using the standing heel-rise test during which the subjects were instructed to lift and drop the heel at a frequency of 0.5?Hz. When subjects were unable to continue due to exhaustion the test was terminated and another MAS test was performed soon after. Results: Significant higher triceps surae MAS was found in men compared to women (p?p??1 and from 14.5 to 13.9?KN?m?1 in men and women, respectively. Percentage changes revealed, however, that in relative terms the changes in all the variables evaluated were similar (p?>?.01) between sexes, with MAS less than 5%. Conclusion: Despite the sex-related differences at baseline, fatigue seems to affect biomechanical properties of the ankle joint similarly in men and women.  相似文献   
2.
目的:研究功能性踝关节不稳者患侧与健侧单腿下落生物力学特征的差异性。方法:采用Vicon红外高速摄像系统和Kistler三维测力台对15名单侧功能性踝关节不稳者分别进行患侧与健侧40 cm高的单腿下落实验测试,采集下落过程中触地侧下肢的地面反作用力及运动学数据,用配对t检验分析两侧间的差异性,检验水准选α=0.05。结果:在触地前100 ms时及触地时膝踝的瞬时角度、落地稳定时间、落地稳定末的踝关节角度、膝前馈的角度变化量以及内外侧方向GRF峰值对应时间的比较中,两侧间差异存在统计学意义。结论:单侧FAI者患侧单腿下落触地后各方向地面反作用力峰值相对比健侧单腿下落时小,各方向地面反作用力峰值的出现时间相对晚于健侧;同时还发现单侧FAI者在下落过程中可能存在前馈神经肌肉控制的改变。  相似文献   
3.
运用Cybex-NORM等速肌力测试系统,RSscan足底压力板测试系统对27名在校大学生(男15名,女12名)进行步向角测试,30°/s,120°/s两种角速度踝关节内收、外展的等动肌力测试,旨在探讨大学生步态特点及内、外八字形成的肌力学机制.研究结果:(1)大学生青年步向角的正常范围为1~15°;(2)男性步向角均值约为11.4°,女性步向角均值约为4.7°,男女性别差异具显著性;(3)角速度为30°/s和120°/s的内收、外展峰力矩,内收、外展平均力矩以及外展内收力矩比值均显示男性大于女性,且有显著性差异;(4)踝关节外展、内收肌力并非随着步向角的增大而增大或减小,内、外八字步态踝关节外展、内收肌力均小于正常步态;(5)30°/s和120°/s两种速度下,3种步态的踝关节外展内收肌力比都几近相等,没有显著性差异.结论:(1)23岁左右青年大学生步向角的正常范围为1~15°,小于1°为内八字步态,大于15°为外八字步态;(2)步向角、踝关节外展、内收肌力矩,外展内收肌力比均存在性别差异;(3)内、外八字不良步态形成的肌力学原因是踝关节外展、内收肌力同时薄弱,而不是外展内收肌力发展失衡,深层原因需要进一步深入探讨和研究.  相似文献   
4.
踝关节损伤是篮球运动中常见的一种损伤。本文通过问卷调查对普通高校体育专业学生在篮球运动中踝关节损伤的类型、程度、原因等进行了调查,根据踝关节生理结构和篮球运动特点对损伤原因进行了研究,并对踝关节损伤的预防提出了合理的建议。  相似文献   
5.
6.
采用三维高速摄像技术和运动生物力学原理,对后旋踢技术身体重心移动、动作所用时间、踝关节角度、膝关节角度和髋关节角度的运动学特征进行比较分析,得出结论:踢击腿在离地瞬间身体重心要快速向回旋方向移动;踢击腿膝关节最大程度弯曲,以缩短动作时间、加快踢击速度;踢击腿髋关节只有最大程度地弯曲,弯曲的膝关节才能快速展开;踢击腿的髋关节最大程度弯曲再打开时,踝关节能快速鞭打;支撑腿弯曲后在踢击腿踢出的瞬间,髋关节开始伸展,将对打击高度产生影响;踢击腿膝关节和髋关节最大程度弯曲时能增加击打力度.  相似文献   
7.
张扬  王太林 《体育科技》2011,32(4):65-67
通过查阅相关资料,并参与山西省太原市业余足球比赛若干场次,对在比赛中踝关节急性损伤的运动员进行各期治疗并进行对比,观察疗效。结果显示:业余足球运动员踝关节损伤后未处理的,痊愈率为17%;只进行前期处理的,痊愈率为50%;进行前期、中期、后期治疗的,痊愈率为100%。  相似文献   
8.
在舞蹈中最重要的基本内容就是脚腕能力的训练,通过地面、扶把以及把下练习,可以跳过脚腕基本功能力,防止出现脚下松懈的状态,使舞者的基本功更加扎实。加强脚腕方面的训练,并与机器相结合,不仅可以使舞者的身体和舞蹈动作结合的游刃有余,更能使舞者的跳动、安稳性提高,使演员在舞蹈方面的能力表现达到更好的发挥,也是创造出具有高水平舞蹈艺术所需要的身体表现语言和手段的必要条件。  相似文献   
9.
The influence of preparation time on ankle joint biomechanics during highly dynamic movements is largely unknown. The aim of this study was to evaluate the impact of limited preparation time on ankle joint loading during highly dynamic run-and-cut movements. Thirteen male basketball players performed 45°-sidestep-cutting and 180°-turning manoeuvres in reaction to light signals which appeared during the approach run. Both movements were executed under (1) an easy condition, in which the light signal appeared very early, (2) a medium condition and (3) a hard condition with very little time to prepare the movements. Maximum ankle inversion angles, moments and velocities during ground contact, as well as EMG signals of three lower extremity muscles, were analysed. In 180°-turning movements, reduced preparation time led to significantly increased maximum ankle inversion velocities. Muscular activation levels, however, did not change. Increased inversion velocities, without accompanying changes in muscular activation, may have the potential to destabilise the ankle joint when less preparation time is available. This may result in a higher injury risk during turning movements and should therefore be considered in ankle injury research and the aetiology of ankle sprains.  相似文献   
10.
PurposeThe purpose of this study was to examine effects of a sport version of a semi-rigid ankle brace (Element?) and a soft ankle brace (ASO) on ankle biomechanics and ground reaction forces (GRFs) during a drop landing activity in subjects with chronic ankle instability (CAI) compared to healthy subjects with no history of CAI.MethodsTen healthy subjects and 10 subjects who had multiple ankle sprains participated in the study as the control and unstable subjects, respectively. The CAI subjects were age, body mass index and gender matched with the control subjects. The arch index and ankle functions of the subjects were measured in a subject screening session. During the biomechanical test session, participants performed five trials of drop landing from 0.6 m, wearing no brace (NB), Element? brace and ASO brace. Simultaneous recording of three-dimensional kinematic (240 Hz) and GRF (1200 Hz) data were performed.ResultsThe CAI subjects had lower ankle functional survey scores. The arch index and deformity results showed greater arch deformity of Element? against a static load than in NB and ASO due to greater initial arch position held by the brace. CAI participants had greater eversion velocity than healthy controls. The ASO brace reduced the first peak vertical GRF whereas Element? increased 2nd peak vertical GRF. Element? brace reduced eversion range of motion (ROM) and peak eversion velocity compared to NB and ASO. In addition, Element? reduced dorsiflexion ROM and increased peak plantarflexion moment compared to NB and ASO.ConclusionResults of static arch measurements and dynamic ankle motion suggest that the restrictions offered by both braces are in part due to more dorsiflexed ankle positions at contact, and higher initial arch position and stiffer ankle for Element?.  相似文献   
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