Xie Zhen-Wen, Wang Li-Juan, Chen Huan, Liang Guo, Yang Xing-Long
Shanghai University of Sport, School of Physical Education, 200 Hengren Street, Yangpu District, Shanghai, CN 200438, China.
J Exerc Sci Fit. 2024 Apr;22(2):145-151. doi: 10.1016/j.jesf.2024.02.003. Epub 2024 Feb 20.
This study examined sedentary volume and bouts of Chinese primary and middle school students during different segments of a school day and determined whether gender and school level are associated with their sedentary volume and bouts.
A total of 472 students participated in this study. Accelerometers were used to measure the sedentary volume and sedentary bouts of different durations (i.e., 1-4 min, 5-9 min and ≥10 min) during all segments.
The participants spent the majority of their time in sitting (61.7%) and sitting bouts of ≥10 min (37.3%). They spent higher percentages of time in sitting during regular classes (76.7%) and out-of-school time (54.5%), and lower during physical education (PE) classes (32.2%), lunch break (35.4%) and recess (38.0%). The highest proportions of time were in sedentary bouts of ≥10 min during regular classes (50.2%), out-of-school time (28.0%) and lunch break (18.8%), while the greatest percentages occurred in sitting bouts of 1-4 min during PE class (16.4%) and recess (18.6%). Girls and middle school students had higher percentages of sedentary volume than boys and primary school students during most segments. They spent greater proportions of time in sitting bouts of ≥10 min during regular classes, lunch break, and out-of-school time, and higher proportions in sedentary bouts of 1-4 min than boys and primary students during PE classes.
Regular class and out-of-school time were identified as key segments for reducing sedentary volume and breaking up prolonged sitting. Interventions on interrupting prolonged sitting during lunch break should also be explored. Girls and middle school students should receive more attention in future interventions.
本研究调查了中国中小学生在学校一天不同时间段的久坐时长和久坐次数，并确定性别和学校年级是否与他们的久坐时长和次数相关。
共有472名学生参与了本研究。使用加速度计测量所有时间段不同时长（即1 - 4分钟、5 - 9分钟和≥10分钟）的久坐时长和久坐次数。
参与者大部分时间处于坐姿（61.7%），且≥10分钟的久坐次数占比为37.3%。他们在常规课程期间（76.7%）和校外时间（54.5%）的坐姿时间占比更高，而在体育课（32.2%）、午餐休息时间（35.4%）和课间休息时间（38.0%）的坐姿时间占比更低。常规课程期间（50.2%）、校外时间（28.0%）和午餐休息时间（18.8%）的≥10分钟久坐次数占比最高，而在体育课（16.4%）和课间休息时间（18.6%）的1 - 4分钟久坐次数占比最大。在大多数时间段，女生和中学生的久坐时长占比高于男生和小学生。在常规课程、午餐休息时间和校外时间，她们≥10分钟久坐次数的占比更大，而在体育课期间，她们1 - 4分钟久坐次数的占比高于男生和小学生。
常规课程和校外时间被确定为减少久坐时长和打破长时间久坐的关键时间段。还应探索在午餐休息时间打断长时间久坐的干预措施。在未来的干预措施中，女生和中学生应受到更多关注。
