目的 系统评价即时自适应干预(just-in-time adaptive intervention,JITAI）在久坐行为和体力活动中的干预效果。 方法 检索PubMed、Web of Science、知网、万方等数据库中关于JITAI应用在久坐行为和体力活动的实验性或类实验性研究，检索时限为建库至2024年2月。采用RevMan 5.4和Stata 15软件进行分析。 结果 共纳入13篇文献，共756例参与者。Meta分析结果表明，JITAI可减少总久坐时间[SMD=-0.42，95%CI(-0.58~-0.26)，P＜0.001]，增加轻度体力活动[SMD=-0.32,95%CI(0.14~0.50)，P＜0.001]。但在久坐次数、中高强度体力活动和长期干预效果方面，差异均无统计学意义(均P＞0.05)。 结论 JITAI可减少久坐时间和促进轻度体力活动，但在中高强度体力活动、久坐次数和长期干预效果方面是否具有优势有待进一步探讨。

Objective To evaluate the effectiveness of JITAI on sedentary behavior(SB) and physical activity(PA).Methods Databases,including PubMed,Web of Science,CNKI,Wanfang and others were searched from inception to February 2024 for relevant experimental and quasi-experimental studies on the application of JITAI targeting sedentary behavior and physical activity.A Meta-analysis was performed using RevMan 5.4 and Stata 15 software.Results 13 studies with 756 participants were included .The findings indicated that JITAI were associated with a significant reduction in the length of sedentary bouts [SMD=-0.42，95%CI(-0.58 to -0.26)，P＜0.001] and an increase in light physical activity(LPA)[SMD=0.32，95%CI(0.14 to -0.50)，P＜0.001].However,no statistically significant effects were observed for sedentary bouts,moderate-to-vigorous physical activity (MVPA) or long-term intervention effects.Conclusions JITAI can reduce the length of sedentary bouts and promote LPA.Nevertheless,further research is needed to verify its effect on moderate to vigorous physical activity,sedentary bouts and long-term behavioral changes.

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国家自然科学基金青年项目(72204029）