A systematic scoping review of study methodology for randomized controlled trials investigating probiotics in athletic and physically active populations

Background:The purported ergogenic and health effects of probiotics have been a topic of great intrigue among researchers,practitioners,and the lay public alike.There has also been an increased research focus within the realm of sports science and exercise medicine on the athletic gut microbiota.However,compared to other ergogenic aids and dietary supplements,probiotics present unique study challenges.The objectives of this systematic scoping review were to identify and characterize study method...     

维吾尔族中学生运动素质的城乡比较

目的了解库车县2所中学13~18岁维吾尔族男、女学生身体素质现状及城、乡差异。方法采用文献资料、问卷调查、测试、数理统计及比较分析等研究方法,对库车县2所城、乡中学的1 460名维吾尔族中学生的速度、爆发力、力量、耐力、柔韧性等身体素质指标进行体质测试及对比分析。同时,对城、乡学校场地器材情况、体育师资力量队伍、开展的课外体育项目以及学生参与课外体育活动、课余锻炼情况、做作业和睡眼时间状况进行对比分析。结果城市和乡村学校维吾尔族中学生50m跑、立定跳远、耐力跑、柔韧性和力量素质之间存在一定的差异。总体上,城市女生除立定跳远成绩优于乡村女生外,其他素质水平乡村男、女生均优于城市男、女生;乡村学生参加课外体育活动时间和次数、积极性,早晨、中午、晚上锻炼时间,睡眼时间等比例高于城市学生。结论库车县城市和乡村维吾尔族中学生身体素质存在差异,相关部门需高度重视,采取有效措施,促进城市和乡村学生健康成长。     

Do PON1-Q192R and PON1-L55M polymorphisms modify the effects of hypoxic training on paraoxonase and arylesterase activity?

Background:Low levels of antioxidant paraoxonase 1(PON 1) enzyme activity,PON1-Q192R polymorphism(a glutamine(Q) to arginine(R)substitution at position 192),PON1-L55M polymorphism(a leucine(L) to methionine(M) substitution at position 55),and oxidized low-density lipoprotein(oxLDL) are risk factors for coronary heart disease.Aerobic exercise improves PON1 activity,but the effects of hypoxic exercise are yet unclear.The aim of this study was to determine the effects of hypoxic underwater rugby tr...     

如何应对新冠肺炎疫情期间的失学问题?

为帮助因新冠肺炎疫情而停课的学生恢复学习能力,世界各国实施了各种助力学生"迎头赶上"的计划.这些计划对教育政策、出资和教学等方面提出了严峻的挑战.     

Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass

Crossing certain aridity thresholds in global drylands can lead to abrupt decays of ecosystem attributes such as plant productivity, potentially causing land degradation and desertification. It is largely unknown,however, whether these thresholds can be altered by other key global change drivers known to affect the water-use efficiency and productivity of vegetation, such as elevated CO₂ and nitrogen(N). Using >5000 empirical measurements of plant biomass, we showed that crossing a...     

YTHDF2-mediated regulations bifurcate BHPF-induced programmed cell deaths

N6-methyladenosine(m⁶A) is a critical regulator in the fate of RNA, but whether and how m⁶A executes its functions in different tissues remains largely obscure. Here we report downregulation of a crucial m⁶A reader, YTHDF2, leading to tissue-specific programmed cell deaths(PCDs) upon fluorene-9-bisphenol(BHPF) exposure. Currently, Bisphenol A(BPA) substitutes are widely used in plastic manufacturing.Interrogating eight common BPA substitutes, we detected BHPF in ...     

“作”、“做”及其用法综述

“作”与“做”是现代汉语中常用的高频词,在日常学习与写作中不但学生容易将两者混淆,就连从事汉语教学的老师也很难将两者准确地区分开来。本文着眼于“作”“做”组词功能、各有关义项及其用法,分析两者的差异,试图探究两者的正确用法,以求对日常汉语教学和汉语学习有所帮助。