中国汉族儿童青少年体力活动视屏时间与20m往返跑的相关性

探讨中国汉族儿童青少年体力活动、视屏时间与20 m往返跑(20 m SRT)的关系,为促进我国儿童青少年心肺耐力提供参考.方法 从中国华东、华北、中南、东北、西北和西南地区,采用随机个案法选取12 221名10~ 18岁汉族儿童青少年作为研究对象,探讨体力活动状况、视屏时间与20m SRT的关系.结果 在上下学方式上,积极类型(步行和骑自行车)女生的高等级20 m SRT成绩检出率高于消极类型(乘公交、出租车、地铁和家长接送)女生,差异有统计学意义(x2=5.753,P<0.05);锻炼时间>60 min/d男女生的高等级20 m SRT成绩检出率高于锻炼时间为<30,30~60 min/d的学生,差异均有统计学意义(P值均<0.05);视屏时间>2 h/d学生的高等级20 m SRT成绩检出率低于视屏时间为1~2,<1h/d的学生,差异均有统计学意义(P值均<0.05).多因素Logistic回归分析发现,锻炼时间>60 min/d、华东地区为中国汉族儿童青少年高等级20 m SRT成绩的保护性因素(OR值分别为1.65,4.24),视屏时间>2 h/d(OR=0.84)为危险因素.结论 视屏时间、体力活动状况与中国汉族儿童青少年心肺耐力密切相关.

Associations among physical activity,screen time and 20 m shuttle run test performances among Chinese children and adolescents of Hart ethnicity

Objective To explore the relationship among physical activity,screen time and 20-meter shuttle run test (20 m SRT) performances among children and adolescents of Han ethnicity,and to provide a basis for promoting the development of cardiorespiratory fitness of Chinese children and adolescents.Methods A total of 12 221 children and adolescents aged 10-18 years of Han ethnicity were chosen by the random case method from six administrative regions,and the association among their physical activity,screen time and 20 m SRT were explored.Results The detection rate of high-grade 20 m SRT performances among girls of positive means of transportation was significantly higher than that in girls of passive means of transportation (x2 =5.753,P<0.05).The prevalence of high-grade 20 m SRT performances among children with exercise time more than 60 min/d was significantly higher than that of children with exercise time <30 min/d,30-60 min/d(P<0.05).The prevalence of high-grade 20 m SRT performances among children of screen time(>2 h/d) was significantly lower than that of children of screen time(< 1 h/d,1-2 h/d) (P<0.05).Logistic regression analysis showed that exercise time above 60 min/d(OR =1.65) and East China(OR =4.24) were protective factors of 20 m SRT performances among Han children and adolescents in China,and screen time above 2 h/d (OR =0.84) was the risk factor.Conclusion Physical activity status(exercise time >60 min/d) is independently associated with higher cardiorespiratory fitness of Chinese children and adolescents of Han ethnicity.However,the more screen time was associated with lower cardiorespiratory fitness.