高中立定三级跳远教学与训练策略     

林池森 《当代体育科技》2020,(12):93-94

在高考制度深化改革的背景下,高中阶段的学科教学越来越注重学生身体素质的培养,体育成为高考必考的一门科目。为了强化高中生的锻炼身体意识,使其拥有健康的心态和强健的体魄,高中体育课堂上出现了越来越多的运动项目与教学内容,如立定三级跳远等,有利于丰富课堂内容,锻炼学生的各种运动能力。本文针对高中立定三级跳远教学与训练策略展开分析。  相似文献   

太极拳桩功对改善骨盆前倾的作用     

范亚军  钟凯强  吕传芬  刘童童 《中华武术(研究)》2020,(3):115-116

在现代信息化生活中,网络已全面侵入我们的日常生活,儿童少年乃至老年人都在使用手机、电脑。由于长期不良的久坐姿势会造成人体形态的改变。其中在青年人中骨盆前倾尤为常见。本文主要运用文献法、问卷调查法从造成骨盆前倾的原因及对人体的危害上进行阐述,引起人们重视,继而提出卷腹运动、太极拳桩功对骨盆前倾的改善方法。  相似文献   

“翻转课堂教学模式”在小学体育教学改革实践中的运用研究--以小学三年级《立定跳远》教学为例     

桂洁 《当代体育科技》2020,(12):11-13

立定跳远,在小学三年级的体育教材中被列为学习跳跃的主要教学内容,为了提高了教学的效率和质量,教师经过多次教学改革实践,从传统的"挤牙膏式"的教学,再到套入情境的教学,最后运用翻转课堂教学模式进行教学,一步步地实践并对比和反思,发现运用"翻转课堂教学模式"的立定跳远课不但有趣还有效,教学效果得到明显提高。  相似文献   

Power training in elite young soccer players: Effects of using loads above or below the optimum power zone     

Irineu Loturco  Lucas A. Pereira  Valter P. Reis  Chris Bishop  Vinicius Zanetti  Pedro E. Alcaraz 《Journal of sports sciences》2020,38(11-12):1416-1422

ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.  相似文献   

The cumulative and residual fatigue response associated with soccer-specific activity performed on different playing surfaces     

Richard Michael Page  Ben Langley  Mitchell James Finlay  Matt Greig  Christopher Brogden 《Journal of sports sciences》2020,38(5):568-575

ABSTRACT

This study aimed to assess the effect of playing surface (Natural [NT] and Artificial [AT] Turf) on the fatigue response to a soccer-specific exercise protocol (SSEP). Eighteen male soccer players completed the SSEP on NT and AT with pre-, post-, and 48 h post-assessments of eccentric knee flexor (eccKF) and concentric knee extensor peak torque (PT), peak countermovement (CMJ) and squat jump (SJ) height, and Nordic hamstring break angle. No significant main effects for surface or any surface and time interactions were observed for any of the outcome measures, except for eccKF PT recorded at 3.14 rad·s^-1, which was significantly lower 48 h post-trial in the AT condition (AT = 146.3 ± 20.4 Nm; NT = 158.8 ± 24.7 Nm). Main effects for time were observed between pre- and post-trial measures for eccKF PT at all angular velocities, Nordic break angle, CMJ and SJ height. Nordic break angle, and both CMJ and SJ height were significantly impaired 48 h post-trial when compared to pre-trial. The findings of the current study suggest surface dependent changes in eccKF PT which may have implications for recovery and subsequent performance after competition on AT.  相似文献   

三类集群的转化关系分析及其对我国集群发展的启示   总被引：1，自引：0，他引：1  

古继宝  吴赵龙 《科学学与科学技术管理》2007,28(2):69-74

在借鉴中外集群模式演化研究成果的基础上，着重探讨了马歇尔集群、卫星式集群及轮轴式集群之间的正向和逆向转化关系，结合我国产业集群发展现状，阐述了这两种转化的实际意义。  相似文献   

蜻蜓拍翼前飞中模型翼动态柔性变形的气动效应研究   总被引：1，自引：0，他引：1  

徐明  余永亮  鲍麟 《中国科学院研究生院学报》2006,23(6):729-735

根据蜻蜓拍翼前飞激发的流场具有St>>1/Re的特点，在理论模化框架下，本文采用势流假设，用二维变形体前、后缘脱涡的面元法研究了前飞模型蜻蜓翼在周期性拍动中动态柔性变形引起的气动力响应。通过比较柔性模型翼和刚性模型翼气动力随时间的变化，发现在下拍行程中动态柔性变形显著地提高了升力和推力；值得注意的是，蜻蜓前飞时，翼的实际柔性变形幅值恰处于一个最佳范围内，它大幅地提高了升力，同时使消耗的气动功率趋近于最低，有利于蜻蜓维持前飞状态。  相似文献   

中国绘画技法之骨法用笔     

谭东风 《安顺师范高等专科学校学报》2008,10(1):119-120

中国绘画笔法中的勾、勒、皴、擦、点无不是以线条为基础进一步拓展的。线条统领了中国绘画。用笔用线不仅是艺术创作的一种技术手段,同时也是传达画家人品、修养、气质和精神的重要媒介。  相似文献   

Flame radiant image numeralization for pulverized coal combustion in BF raceway   总被引：4，自引：0，他引：4  

WEN Liang-ying OU Yang-qi BAI Chen-guang WANG Hua 《重庆大学学报(英文版)》2005,4(4):195-198

1 Introduction 1 For pulverized coal injected into a blast furnace, the space from the outlet of the coal gun to the center of the raceway is the key district for the coal’s burning and also for works to probe hearth state. Remarkable achievements have been made in research on numerical simulation of combustion processes [1], but further advances are hindered owing to the limits of the means to examine three-dimension parameter distribution in the furnace. Temperature is the most basic parame…  相似文献   

发扬批评与自我批评的优良传统保持党的先进性     

姜献生 《柳州职业技术学院学报》2004,4(4):12-16

坚持党的先进性是加强和改进党的建设的核心问题，而批评与自我批评是我党的优良传统和三大作风之一，对于党保持先进性具有十分重要的作用。本文从四个方面对批评与自我批评展开论述。  相似文献