TY - JOUR AU - Verswijveren, Simone Johanna Josefa Maria AU - Abbott, Gavin AU - Lai, Samuel K AU - Salmon, Jo AU - Timperio, Anna AU - Brown, Helen AU - Macfarlane, Susie AU - Ridgers, Nicola D PY - 2022 DA - 2022/8/16 TI -活动追踪器对青少年身体活动和久坐时间的影响及行为改变干预:二级分析集群的随机对照试验乔- JMIR Mhealth Uhealth SP - e35261六世- 10 - 8 KW -运动行为KW -青年KW -个加速器KW - Fitbit KW -关联KW -关联KW -身体活动KW -锻炼KW -随机对照试验KW - RCT KW -控制试验KW -澳大利亚KW -青少年KW -青春期KW -少年千瓦久坐KW -认知理论KW -行为理论KW -可穿戴KW -追踪KW -追踪装置KW -临床试验AB-背景:青春期是身体活动急剧减少和久坐时间增加的关键年龄。因此，促进身体活动应成为短期和长期健康益处的优先事项。可穿戴式活动追踪器与支持性资源相结合，有可能影响青少年的身体活动水平和久坐行为。检查这些干预措施起作用的途径可以告知在未来的研究中应该针对哪些介质。目的:通过6个月的随访，研究提高身体活动意识(RAW-PA)干预对干预后行为改变的潜在中介因素的影响，以及这些中介因素是否介导了干预对身体活动和久坐时间的影响。方法:RAW-PA是一项为期12周的干预，以社会认知理论和行为选择理论为基础，旨在通过将可穿戴活动跟踪器与通过私人Facebook小组提供的数字资源相结合，增加不活跃青少年的身体活动(n=159完整病例)。从先前的青少年研究中确定了目标潜在中介，包括自我效能感、同伴支持、家庭支持、教师支持、自我调节策略、障碍和享受。结果包括久坐时间以及轻强度和中等强度到高强度的身体活动。 A series of mixed linear models were used to estimate intervention effects on physical activity and sedentary behavior at follow-up and on potential mediators after intervention and to test whether there were indirect effects of the intervention on physical activity and sedentary behavior via mediators. Results: Adolescents in the intervention group (n=75) engaged in higher sedentary time and lower light intensity at 6-month follow-up compared to the wait-list controls (n=84). There were no intervention effects for moderate-to-vigorous–intensity physical activity. The intervention group perceived more barriers to physical activity than the wait-list control group at 6-month follow-up (mean adjusted difference=1.77; 95% CI 0.19-3.34; P=.03). However, indirect effects for each outcome were not statistically significant, indicating that perceived barriers to physical activity did not mediate intervention effects for physical activity or sedentary time. Conclusions: RAW-PA did not beneficially impact hypothesized mediators in these inactive adolescents, despite strategies being designed to target them. This suggests that the lack of overall intervention effects on physical activity and sedentary time observed in the RAW-PA study could be due to the limited impact of the intervention on the targeted mediators. Future studies should consider different strategies to target theoretically informed potential mediators and identify intervention strategies that effectively target key mediators to improve physical activity among inactive adolescents. Finally, intervention effects according to level of wearable tracker use or level of engagement with the intervention should be explored. This may provide important insights for designing successful wearable activity tracker interventions. Trial Registration: Australian New Zealand Clinical Trials Registry ACTRN12616000899448; https://anzctr.org.au/Trial/Registration/TrialReview.aspx?id=370716&isReview=true International Registered Report Identifier (IRRID): RR2-10.1186/s12889-016-3945-5 SN - 2291-5222 UR - https://mhealth.www.mybigtv.com/2022/8/e35261 UR - https://doi.org/10.2196/35261 UR - http://www.ncbi.nlm.nih.gov/pubmed/35972777 DO - 10.2196/35261 ID - info:doi/10.2196/35261 ER -