Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, USA.
Department of Exercise Science, University of South Carolina, Columbia, SC, USA.
J Behav Med. 2022 Jun;45(3):391-403. doi: 10.1007/s10865-022-00309-2. Epub 2022 Apr 1.
Previous studies among adolescents conceptualize behavioral cognitions [e.g., intentions and perceived behavioral control (PBC)] as stable trait-like factors despite evidence suggesting they vary momentarily. We examined whether intentions and PBC momentarily relate to subsequent sedentary time during non-school periods. Healthy adolescents (N = 15, ages 11-15) reported their intentions and PBC regarding sedentary leisure behaviors via ecological momentary assessment (EMA) up to seven times/day for 14 days. Sedentary time in the two hours following each EMA prompt was measured by ActivPAL accelerometers. When participants reported greater sedentary intentions (within-person β = 1.1, 95% CI 0.2, 2.1, p = 0.0213) and sedentary PBC (within-person β = 1.7, 95% CI 0.6, 2.8, p = 0.0029), they accumulated greater sedentary time. This demonstrates that sedentary intentions and PBC are acutely associated with sedentary time among adolescents. Our findings highlight the potential for implementing just-in-time activity interventions among adolescents during at-risk periods within the day, characterized by deviations from one's usual intentions and PBC levels.
先前针对青少年的研究将行为认知（例如意图和感知行为控制（PBC））概念化为稳定的特质因素，尽管有证据表明它们会随时间变化。我们研究了意图和 PBC 是否与非上学期间随后的久坐时间有关。健康的青少年（N=15，年龄 11-15 岁）通过生态瞬间评估（EMA）每天最多报告七次关于久坐休闲行为的意图和 PBC。在每次 EMA 提示后的两小时内，通过 ActivPAL 加速度计测量久坐时间。当参与者报告更大的久坐意图（个体内β=1.1，95%置信区间 0.2，2.1，p=0.0213）和更大的久坐 PBC（个体内β=1.7，95%置信区间 0.6，2.8，p=0.0029）时，他们积累了更多的久坐时间。这表明久坐意图和 PBC 与青少年的久坐时间密切相关。我们的研究结果突出了在一天中风险时期，针对青少年实施及时活动干预的潜力，这些时期的特点是偏离了他们通常的意图和 PBC 水平。
