目的分析国内外儿童青少年力量素质变化趋势,探讨其相关因素,为儿童青少年健康促进策略的发展提供参考依据。方法运用布尔逻辑运算组合检索Web of Science (WOS)、PubMed、EBSCO、中国知网(CNKI)数据库自收录开始至2020年10月16日发表的文献,经过删重和筛选最终纳入27篇文献。结果在1964-2017年间国内外儿童青少年力量素质研究结果存在不一致性,63.6%、45.4%和44.4%的儿童青少年力量素质指标结果显示爆发力、肌肉耐力和最大力量呈现下降的趋势。进一步对儿童青少年的下肢力量数据进行提取发现,男女生下肢力量存在不同程度的下降趋势。结论总体而言,儿童青少年力量素质倾向于下降的趋势,各指标和各国趋势走向不尽相同,这可能与各国社会环境、政策计划等存在较大的关联。未来国内外需要强调儿童青少年力量素质的重要性,制定相应策略,规定儿童青少年锻炼的具体标准。此外,我国需借鉴国外优秀经验,联合家庭、学校和社区共同促进儿童青少年的体质健康。
New fluorescent silica nanoparticles for sensors simultaneous determination of double targets were synthesized via a reverse microemulsion method based on the fluorescence resonance energy transfer(FRET).Nanoparticle A was doped with a dye complex which consisted of two dye molecules,fluorescein and tetramethylrhodamine.These dye molecules were first linked with avidin and biotin,respectively.They then formed a stable dye complex through avidin-biotin bridge within the distance of FRET.Nanoparticle B was doped with fluorescein only.As a result of this combination,the nanoparticles emit double wavelengths when a single excitation wavelength is used.The results show that the fluorescent nanoparticles are promising fluorescent labeling reagents for the sensitive detection of double targets.
