Sex-specific associations of moderate and vigorous physical activity with physical fitness in adolescents     

T. Kidokoro  H. Tanaka  K. Naoi  K. Ueno  T. Yanaoka  K. Kashiwabara 《European Journal of Sport Science》2016,16(8):1159-1166

The present study examined the sex-specific associations of moderate and vigorous physical activity (VPA) with physical fitness in 300 Japanese adolescents aged 12–14 years. Participants were asked to wear an accelerometer to evaluate physical activity (PA) levels of various intensities (i.e. moderate PA (MPA), 3–5.9 metabolic equivalents (METs); VPA, ≥6 METs; moderate to vigorous PA (MVPA), ≥3 METs). Eight fitness items were assessed (grip strength, bent-leg sit-up, sit-and-reach, side step, 50?m sprint, standing long jump, handball throw, and distance running) as part of the Japanese standardised fitness test. A fitness composite score was calculated using Japanese fitness norms, and participants were categorised according to their score from category A (most fit) to category E (least fit), with participants in categories D and E defined as having low fitness. It was found that for boys, accumulating more than 80.7?min/day of MVPA may reduce the probability of low fitness (odds ratio (ORs) [95% confidence interval (CI)]?=?0.17 [0.06–0.47], p?=?.001). For girls, accumulating only 8.4?min of VPA could reduce the likelihood of exhibiting low fitness (ORs [95% CI]?=?0.23 [0.05–0.89], p?=?.032). These results reveal that there are sex-specific differences in the relationship between PA and physical fitness in adolescents, suggesting that sex-specific PA recommendation may be needed to improve physical fitness in adolescents.  相似文献   

水分胁迫下亚精胺对小麦幼苗蛋白质含量与蛋白酶活性的影响   总被引：1，自引：0，他引：1  

段辉国  黄作喜  卿东红  齐泽民 《内江师范学院学报》2006,21(2):69-72

研究了水分胁迫下亚精胺对小麦幼苗相对含水量、叶绿素总量、蛋白质含量和蛋白酶活性的影响。结果显示,亚精胺预处理延缓水分胁迫下小麦幼苗叶片含水量、叶绿素含量和蛋白质含量的下降,抑制蛋白酶活性的上升。表明亚精胺预处理对水分胁迫的小麦幼苗具有防衰抗旱的保护作用。  相似文献   

提高中学德育有效性的心理学思考--寻求道德教育的合理支点     

罗箭华  韦慧学 《柳州师专学报》2006,21(2):133-136

中学道德教育是师生双向行动过程,教育者对学生的影响,包括学校对学生提出的要求、内容,采取的方式方法等,要符合学生的心理活动规律和发展水平,从而促进其发展,提高教育的实效性。  相似文献   

浅论物理概念的分类及其教学策略     

谭志中  李颂 《中国教育研究与创新》2005,2(11):25-26

正确理解物理概念对于学生学习物理学科有着重要意义，科学而有效的物理教学方法应当重视学生心理活动的分析、解释与控制，并与学生的认知活动相符合。本文探讨了物理概念的分类及其特性，并从教育心理研究的角度提出物理概念教学的基本策略。  相似文献   

学科活动·单元主题活动·方案教学     

秦元东 《幼儿教育》2006,(10)

在幼儿园教育改革过程中,许多幼儿园疲于追赶时代潮流,从学科活动到单元主题活动,再到热极一时的方案教学,变到最后却发现教育质量并没有得到多少提高.其中的症结是什么?本文在分析了学科活动、单元主题活动和方案教学的基础上,指出三者之间不再是泾渭分明,而是处于一种边缘状态,正在逐渐走向融合.幼儿园教育改革的核心不是表面的教育活动形式选择,而是教师教育观念的深层变革.  相似文献   

周口师范学院教师体育健身现状的调查研究     

郭瑞华 《周口师范学院学报》2007,24(5):141-143

采用文献资料、问卷调查和数理统计等方法，对周口师范学院教师体育健身现状进行了调查研究.调查结果显示，周口师范学院教师的体育健身状况不容乐观；在体育健身动机、项目选择和活动形式上具有明显的年龄倾向；没时间是影响教师参与体育健身活动的主要因素.并针对上述现状提出了相应的对策.  相似文献   

美丽的德育在成长——“欣赏型德育模式建构研究”的案例述评     

檀传宝  蔡辰梅 《中国德育》2006,1(5):52-57

“欣赏型德育模式”力图建立一种德美、育美欣赏过程中的“参谋或伙伴”式的师生关系;要求教师通过教学活动中道德美和教育形式美的呈现去“涵泳”学生;设计审美、立美化的活动以使学生成长为德美兼备的时代新人;强调运用艺术手段对德育进行审美化改造,变“外求”、“他塑”的“灌输型”德育为自主感悟的德育。  相似文献   

Synthetic and biological studies on a cyclopolypeptide of plant origin     

Dahiya R  Kumar A 《Journal of Zhejiang University. Science. B》2008,9(5):391-400

Objective: A natural cyclic peptide previously isolated from Citrus medica was synthesized by coupling oftetrapep-tide units Boc-Leu-Pro-Trp-Leu-Ome and Boc-Ile-Ala-Ala-Gly-Ome after proper deprotection at carboxyl and amino terminals followed by cyclization of linear octapeptide segment.Methods: Solution phase technique was adopted for the synthesis of cyclooctapeptide--sarcodactylamide.Required tetrapeptide units were prepared by coupling of Boc-protected dipeptides viz.Boc-Leu-Pro-OH and Boc-Ile-Ala-OH with respective dipeptide methyl esters Trp-Leu-Ome and Ala-Gly-Ome.Cyclization of linear octapeptide unit was done by p-nitrophenyl ester method.The structure of synthesized cyclopolypeptide was elucidated by FTIR,1H NMR,13C NMR,FABMS spectral data and elemental analysis.The newly synthesized peptide was evaluated for dif-ferent pharmacological activities including antimicrobial,anthelmintic and cytotoxic activities.Results: Synthesis of sarcodac-tylamide was accomplished with >78% yield utilizing dicyclohexylcarbodiimide (DCC) as coupling agent.Newly synthesized peptide possessed potent cytotoxic activity against Dalton's lymphoma ascites (DLA) and Ehrlich's ascites carcinoma (EAC) cell lines,in addition to moderate anthelmintic activity against earthworms Megascoplex konkanensis,Pontoscotex corethruses and Eudrilus sp.Moreover,cyclopolypeptide displayed good antimicrobial activity against pathogenic fungi Candida albicans and Gram-negative bacteria Pseudomonas aeruginosa,in comparison to standard drugs griseofulvin and ciprofloxacin.Conclusion: Solution phase technique employing DCC and triethylamine (TEA) as base proved to be effective for the synthesis of natural cyclooctapeptide.N-methyl morpholine (NMM) was found to be a better base for the cyclization of linear octapeptide unit in comparison to TEA and pyridine.  相似文献   

微机原理和汇编语言的课程改革     

邝涛  潘红 《平原大学学报》2005,22(6):86-88

高职高专教育已经是我国高等教育中一支重要的力量，本文通过对《汇编语言》和《微型计算机接口技术》这两门专业基础课的合并教学以及教学效果的对比，总结了在对离职高专教学改革工作的一些体会。  相似文献   

质量伦理与当代经济     

叶蓬 《石家庄法商职业学院教学与研究》2006,(4)

质量伦理在当代社会经济中不再仅仅是附属于商业的职业伦理,它是当代经济活动或企业活动不可缺少的内在伦理机制,是经济制度创新和发展的重要动力。质量伦理意味着一种世界范围内的国家经济竞争力,它对市场经济作为一种避免畸形经济的健康经济、高生活质量标准的经济具有规范作用。  相似文献