Song Yun-Feng, Xu Chi, Li Kai-Xin, Tan Si-Jie, Qi Yu-Gang
Key Laboratory of Scientific Selection and Functional Assessment of Athletes of General Administration of Sport of China,Hubei Institute of Sports Science,Wuhan 430205,China.
School of Physical Education(Main Campus),Zhengzhou University,Zhengzhou 450001,China.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2025 Apr 30;47(2):155-163. doi: 10.3881/j.issn.1000-503X.16102.
Objective To explore the accumulated effects of physical activity,sedentary behavior,and sleep on cardiorespiratory fitness(CRF)among college students and provide effective measures for enhancing their CRF. Methods From May to June in 2023,223 college students aged 18 to 24 years old were recruited from Tianjin University of Science and Technology for a 24 hours activity behavior survey and CRF testing.Compositional analysis was employed to investigate the relationships of physical activity,sedentary behavior,and sleep with CRF.Isotemporal substitution models were established to predict the effects of substituting various activity behaviors on CRF.Results The proportion of time spent on moderate-to-vigorous physical activity(MVPA)was positively correlated with CRF of college students(=6.40,=0.002),while the proportion of time spent on sedentary behavior was negatively correlated with CRF(=-3.02,=0.004).Light physical activity(LPA)and sleep were not correlated with CRF(=-1.06,=0.504).Isotemporal substitution results for 15-min increments showed that replacing other activity behaviors with MVPA significantly increased the CRF of college students[SB:1.72 mL/(kg·min),95% =0.94-2.51;LPA:1.82 mL/(kg·min),95% =0.95-2.68;sleep:1.64 mL/(kg·min),95% =0.84-2.45].In the dose-response relationship from -30 min to 30 min,reallocating time from other behaviors to MVPA had greater adverse effect on CRF than reallocating time from MVPA to other behaviors.Among all the substitutions,replacing LPA with MVPA had the most beneficial effect on improving CRF.Additionally,a 5-min increment was considered the optimal tipping point for MVPA replacing other activities.Conclusions This study underscores the importance of participating in MVPA for improving the CRF of college students.The isotemporal substitution model provides clear goals for the allocation of time for these behaviors,aiding in future intervention measure development and policy-making.
目的 探讨身体活动、久坐行为和睡眠对大学生心肺适能（CRF）的累积影响，并为提高大学生心肺适能提供有效措施。方法 2023年5月至6月，从天津科技大学招募223名18至24岁的大学生，进行24小时活动行为调查和心肺适能测试。采用成分分析方法研究身体活动、久坐行为和睡眠与心肺适能的关系。建立等时替代模型，预测替代各种活动行为对心肺适能的影响。结果 中等至剧烈身体活动（MVPA）的时间占比与大学生的心肺适能呈正相关（β = 6.40，P = 0.002），而久坐行为的时间占比与心肺适能呈负相关（β = -3.02，P = 0.004）。轻度身体活动（LPA）和睡眠与心肺适能无相关性（β = -1.06，P = 0.504）。以15分钟增量的等时替代结果显示，用MVPA替代其他活动行为可显著提高大学生的心肺适能[久坐行为：1.72 mL/（kg·min），95%CI = 0.94 - 2.51；轻度身体活动：1.82 mL/（kg·min），95%CI = 0.95 - 2.68；睡眠：1.64 mL/（kg·min），95%CI = 0.84 - 2.45]。在从 -30分钟到30分钟的剂量反应关系中，将时间从其他行为重新分配到MVPA对心肺适能的不利影响大于将时间从MVPA重新分配到其他行为。在所有替代中，用MVPA替代LPA对改善心肺适能的效果最有益。此外，5分钟的增量被认为是MVPA替代其他活动的最佳临界点。结论 本研究强调了参与MVPA对提高大学生心肺适能的重要性。等时替代模型为这些行为的时间分配提供了明确目标，有助于未来制定干预措施和政策。
