Li Ming, Yin Xiaojian, Li Yuqiang, Sun Yi, Zhang Ting, Zhang Feng, Liu Yuan, Guo Yaru, Sun Pengwei
College of Physical Education and Health, East China Normal University, Shanghai 200241, China.
Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai 200241, China.
Children (Basel). 2022 Jul 29;9(8):1140. doi: 10.3390/children9081140.
The increase in sedentary behavior in children and adolescents has become a worldwide public health problem. This study aimed to explore the associations between sedentary time (ST) and sedentary patterns (SP) and the cardiorespiratory fitness (CRF) of Chinese children and adolescents. The CRF of 535 participants was determined using a 20-m shuttle run test. ST and SP were measured with accelerometers. Questionnaires were used to investigate the different types of ST. Multiple linear regression models were used to test the associations between ST and SP and CRF. In this study, only some ST and SP indicators were found to be significantly associated with CRF in girls. With each additional 10 min of screen time or passive traffic time, VO decreases by 0.06 mL/kg/min ( = -0.006, 95% : -0.010-0.001) and 0.31 mL/kg/min ( = -0.031, 95% : -0.061-0.002), respectively, with MVPA control. With each additional 10 min of breaks in ST or duration of breaks in ST, VO increases by 0.41 mL/kg/min ( = 0.041, 95% : 0.0070.076) and 0.21 mL/kg/min ( = 0.021, 95% : 0.0070.035), respectively, with control total ST. Breaks in ST ( = 0.075, 95% : 0.0270.123) and the duration of breaks in ST ( = 0.021, 95% : 0.0120.146) were positively correlated with CRF when controlling for LPA, but these associations were not significant when controlling for MVPA ( = 0.003, 95% : -0.0420.048; = 0.001, 95% : -0.0240.025). The total ST of children and adolescents was found to not be correlated with CRF, but when ST was divided into different types, the screen time and passive traffic time of girls were negatively correlated with CRF. More breaks in ST and the duration of breaks in ST were positively associated with higher CRF in girls. MVPA performed during breaks in ST may be the key factor affecting CRF. Schools and public health departments should take all feasible means to actively intervene with CRF in children and adolescents.
儿童和青少年久坐行为的增加已成为一个全球性的公共卫生问题。本研究旨在探讨中国儿童和青少年的久坐时间（ST）、久坐模式（SP）与心肺适能（CRF）之间的关联。采用20米往返跑测试测定535名参与者的CRF。使用加速度计测量ST和SP。通过问卷调查来调查不同类型的ST。采用多元线性回归模型来检验ST、SP与CRF之间的关联。在本研究中，仅发现部分ST和SP指标与女孩的CRF显著相关。在控制中度至剧烈身体活动（MVPA）的情况下，每增加10分钟的屏幕时间或被动交通时间，摄氧量（VO）分别降低0.06毫升/千克/分钟（β = -0.006，95%置信区间：-0.010-0.001）和0.31毫升/千克/分钟（β = -0.031，95%置信区间：-0.061-0.002）。在控制总ST的情况下，每增加10分钟的ST中断时间或ST中断时长，VO分别增加0.41毫升/千克/分钟（β = 0.041，95%置信区间：0.0070.076）和0.21毫升/千克/分钟（β = 0.021，95%置信区间：0.0070.035）。在控制轻身体活动（LPA）时，ST中断（β = 0.075，95%置信区间：0.0270.123）和ST中断时长（β = 0.021，95%置信区间：0.0120.146）与CRF呈正相关，但在控制MVPA时，这些关联不显著（β = 0.003，95%置信区间：-0.0420.048；β = 0.001，95%置信区间：-0.0240.025）。研究发现儿童和青少年的总ST与CRF无关，但当将ST分为不同类型时，女孩的屏幕时间和被动交通时间与CRF呈负相关。ST中断次数更多以及ST中断时长与女孩更高的CRF呈正相关。在ST中断期间进行的MVPA可能是影响CRF的关键因素。学校和公共卫生部门应采取一切可行手段，积极干预儿童和青少年的CRF。
