Building back better to avert a learning catastrophe: Estimating learning loss from COVID-19 school shutdowns in Africa and facilitating short-term and long-term learning recovery     

《International Journal of Educational Development》2021

We model learning losses due to the COVID-19 pandemic and the potential for cost-effective strategies to build back better. Data from Early Grade Reading Assessments in Ethiopia, Kenya, Liberia, Tanzania, and Uganda suggest half to over a year’s worth of learning loss. In modeling losses over time, we found that learning deficits for a child in grade 3 could lead to 2.8 years of lost learning by grade 10. While COVID-19 has stymied learning, bold, learning-focused reform consistent with the literature reviewed in this paper—specifically reform on targeted instruction and structured pedagogy—could improve learning even beyond pre-COVID-19 levels.  相似文献   

史朝义之死考     

勾利军  朱宇强 《河南师范大学学报(哲学社会科学版)》2005,32(6):81-83

史朝义之死是唐代历史中的一个重要问题,因为他的死亡标志着八年安史之乱的结束。但关于史朝义的死亡时间、死亡地点及英死亡方式,《旧唐书》、《新唐书》、《资治通鉴》等基本史书的相关记载却不尽相同,今人对这一问题也未展开专门讨论,一些论著涉及到这一问题时认识并不一致,本文试对这一问题进行分析,试求出历史真相。  相似文献   

我国女子3000m障碍的训练特征与恢复     

白铂 《哈尔滨体育学院学报》2008,26(1):110-112

女子3 000m障碍是北京奥运会的新项目,分析其主要训练特征,以及高强度的训练后疲劳产生的机制,并提出了消除疲劳的方法,是科学训练取得好成绩的关键。  相似文献   

Carbohydrate ingestion improves endurance performance during a 1h simulated cycling time trial     

M. S. El-Sayed  J. Balmer  A. J. M. Rattu 《Journal of sports sciences》2013,31(2):223-230

This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue.  相似文献   

足反射区按摩促进大强度有氧耐力运动疲劳消除的实验研究   总被引：6，自引：0，他引：6  

田惠林  葛廷云  刘春燕 《北京体育大学学报》2006,29(3):340-342

为研究足反射区按摩对有氧耐力运动后自由基的影响,揭示足反射区按摩促进运动性疲劳恢复的机制.采用自身对照的研究方法,受试者进行一次大强度有氧耐力运动,分别测定运动前、运动后即刻、足反射区按摩或自然恢复后即刻、以及按摩或自然恢复后24h血清中MDA的含量和SOD的活性.结果发现:1)试验强度运动1h,试验者体内自由基的浓度大量增加,清除自由基的抗氧化酶(SOD)的活性也有显著性增高,自由基的生成和清除的动态平衡遭到破坏.2)运动后适时进行足反射区按摩,可以减少自由基的生成,加快运动性疲劳的恢复.  相似文献   

篮球运动员的疲劳消除与运动营养   总被引：6，自引：0，他引：6  

孙树勋 《四川体育科学》2004,(3):35-36

根据篮球运动的特点及其能量供应特点分析篮球运动员在运动过程中产生疲劳的原因和机理，探讨篮球运动体能恢复的有效措施和运动营养措施，给篮球教学和训练中运动员的恢复与营养提供参考和建议。  相似文献   

太极拳锻炼对轻度退行性膝关节炎的影响     

周勇  邹文龙  韩静 《福建体育科技》2011,30(6):30-32

探讨太极拳锻炼对轻度退行性膝关节炎患者的康复效果。对60名轻度退行性膝关节炎患者进行6个月的太极拳运动处方锻炼,以疼痛程度评分、软骨损伤度MRI对比、膝关节活动度和《中医病证诊断疗效标准》为评价参量,分析和探讨太极拳的健身价值。结果表明,太极拳锻炼组退行性膝关节炎患者疼痛程度较对照组呈显著性下降（P〈0．05）,软骨损...  相似文献   

武术套路高水平运动员运动性疲劳的评价与恢复研究     

王燕  田伟  张赫男 《哈尔滨体育学院学报》2011,29(4):39-42

采用文献资料、测试、数理统计等研究方法,对武术运动员的运动性疲劳进行实验研究。结果表明,超套训练后心率、血压、血乳酸值,均有较大幅度提升,血红蛋白指标、CK值提升不明显、血尿素氮有所增加,超套训练后女运动员的运动性疲劳表现较为明显。教练员应根据运动员不同性别、个体的差异性以及依据生理生化指标的变化,有针对性地调整运动量与运动负荷,可采用合理营养膳食、保证睡眠、药物方法等方法,加快运动员的疲劳恢复。  相似文献   

体育旅游的健身康复功效研究   总被引：4，自引：0，他引：4  

段国新 《广州体育学院学报》2004,24(5):117-119

通过对体育旅游的概念、内容及功效的分析和阐述，着重探讨了体育旅游的健身康复功效。研究结果认为健身康复功效是体育旅游功效的一个重要方面。  相似文献   

下一代数据保护技术研究     

李春霞 《人天科学研究》2013,(8):125-127

随着IT界数据快速增长和数据的日益复杂现状,下一代数据保护技术已经逐渐成为一个热门的研究课题。对下一代数据保护技术进行了研究,提出了实施方案和技术路线,解决了目前数据快速增长及日益复杂的问题。  相似文献