How much does lower body strength impact Paralympic running performance?     

E. M. Beckman  M. J. Connick  S. M. Tweedy 《European Journal of Sport Science》2016,16(6):669-676

Objectives: Development of evidence-based methods of Paralympic classification requires research quantifying the relative strength of association between ratio-scaled measures of impairment and athletic performance. The purpose of this study was to quantify the extent to which muscle strength affects running performance in runners with and without brain impairment. Design: Cross-sectional study. Methods: Participants were 41 male runners: 13 with brain impairments (RBI) and 28 non-disabled (NDR). All participants completed a maximal 60-m sprint and a novel battery of three lower limb isometric strength tests. Results: RBI showed significantly lower strength scores compared with NDR on the more affected side in leg flexion (176 vs. 243?N), leg extension (993 vs. 1661?N) and plantarflexion (824 vs. 1457?N). Significant differences were also seen on the less affected side in plantarflexion (1072 vs. 1508?N). RBI were significantly slower in the acceleration phase (0–15?m) (3.2?s?±?0.3?vs. 2.8?s?±?0.2) and top speed phase (30?60?m) (4.3?s?±?0.6?vs. 3.8?s?±?0.3). Correlation analysis showed stronger relationships between strength and running performance in RBI than NDR; however, the correlations were not significant. Conclusions: This study evaluated measures to assess strength for the purposes of classification and found that the measures were significantly different in RBI compared with NDR indicating the tests were able to capture strength impairment in this population. This study indicates that strength may be an important impairment type to assess in this population, as impairments of muscle strength may influence the outcome of running performance in athletes with more severe impairments.  相似文献   

Physical activity profiles and selected muscular fitness variables in English schoolchildren: A north–south divide?     

Lee Ingle  Ashlie Stephenson  Gavin R. Sandercock 《European Journal of Sport Science》2016,16(8):1187-1196

The aim of the study was to compare and contrast habitual physical activity (PA) profiles and muscular fitness in schoolchildren from northern and southern regions of England. Data were collected from two secondary schools in the north east (NE) of England. The study procedures followed methods employed by the East of England Healthy Hearts Study in 10–16-year-old boys and girls based in the south east (SE) region of England and data were compared. Habitual physical activity (PAQ-A), vertical jump test, and hand-grip (HG) strength were assessed. We converted raw scores from all assessments to age- and sex-normalised z-scores. We recruited 597 children (58% boys) in the NE and compared findings to 597 age- and sex-matched boys and girls from the SE. Boys in the SE had significantly stronger HG scores, jumped higher, were more powerful (mean peak power: 2131?W vs. 1782?W; P?P?P?相似文献   

Low-intensity electrical muscle stimulation induces significant increases in muscle strength and cardiorespiratory fitness     

Toshiaki Miyamoto  Hiroyuki Kamada  Akira Tamaki  Toshio Moritani 《European Journal of Sport Science》2016,16(8):1104-1110

The aim of this study was to investigate the effect of low-intensity exercise training using belt electrode skeletal muscle electrical stimulation on muscle strength and cardiorespiratory fitness in healthy subjects. Nineteen healthy subjects were allocated into control or intervention groups; in both groups the participants kept regular physical activity while the intervention group underwent 30 min B-SES training at 3–4 METs for four weeks. Knee extensor muscle strength and cardiorespiratory endurance during incremental exercise test were measured at baseline and after four weeks for all participants. The relative change of knee extensor muscle strength in the intervention group was significantly higher than control group (p?p?相似文献   

钢结构材料在高温(火灾)条件下的力学性能试验研究     

魏瑞演 《福建工程学院学报》2002,(1)

从基本的钢结构材料在高温下的力学性能着手 ,进行高温条件下钢结构材料的性能试验 ,建立高温下钢材的屈服强度、极限强度、弹性模量和极限应变随温度变化的力学模型 ,为高温 (火灾 )条件下钢结构的结构分析提供依据。  相似文献   

电磁力测量试验台的设计   总被引：2，自引：0，他引：2  

边忠国 《实验技术与管理》2007,24(4):64-65,76

从试验台的结构特点和工作流程入手,介绍了其液压系统的工作原理及特点。实践证明:该系统设计合理、工作可靠、调节控制灵活方便。  相似文献   

高速线材核心设备在线监测诊断技术的应用     

朱昌健  赵凯星  王双启 《唐山学院学报》2007,20(6):33-35

为提高高速线材设备的预知维修能力,达到降低成本、减少事故时间的目的,对高速线材核心设备安装在线监测诊断系统。通过系统的运行,实现预知维修,对设备的安全可靠运行起到了积极的保障作用,同时保证了连续性生产。  相似文献   

对高水平男子跳高运动员专项力量训练手段的研究     

张红霞 《滨州学院学报》2006,22(6):86-88

运用文献资料法、问卷调查法、统计分析等方法,对高水平男子跳高运动员专项力量训练手段进行统计研究,遴选出常用的、功效性高的专项力量训练手段18项,并将其分为爆发力、支撑力量、起跳力量、摆动力量和腹(背)肌力量5类,为男子跳高运动员专项力量的训练提供有价值的参考.  相似文献   

利用平衡条件求物体运动的速度——浅谈物体运动速度的一种解法及相关物理过程的分析     

张许平 《西安文理学院学报》2001,16(3):50-51,54

本文就高中物理中求物体运动的速度这一问题进行探讨,通过举例,分析了力学和电学中利用平衡条件求物体运动的速度这一方法的难点.总结了这一方法应满足的基本条件--物体受到的力中至少有一个力与速度有定量关系,指导学生学习.  相似文献   

对提高学生立定跳远成绩的探讨     

袁正刚 《安阳师范学院学报》2001,(2):86-87

分析了影响立定跳远成绩的原因，有针对性地提出了具体的训练方法。  相似文献   

对跳远两种技术的初步探讨     

毛立力 《宁波教育学院学报》2002,4(1):53-55

以世界优秀跳远选手刘易斯和埃米扬的典型两跳为参照,分析了我国优秀跳远运动员在助跑速度、绝对速度、速度利用率、腾起角度与两选手之间的差异,提出了近期内练就刘易斯一样以速度见长的技术特点（低跳跃型）可能性不大的情况下,适度调整垂直速度和水平速度的比例,降低助跑速度利用率,增大腾起角,走埃米扬力量见长（高跳跃型）技术之路,是我国优秀跳远运动员提高成绩的有效途径。  相似文献