期刊名称：Health Psychology and Behavioral Medicine: An Open Access Journal
电子版ISSN：2164-2850
出版年度：2022
卷号：10
期号：1
页码：199-228
DOI：10.1080/21642850.2022.2032074
语种：English
出版社：Taylor and Francis Ltd
摘要：Online communities and social networking sites have great potential for supporting health behavior change. However, interventions vary greatly in participants’ engagement rates and, consequently, their effectiveness. Theory-based interventions in real-world contexts are needed to further increase engagement and effectiveness. Methods: We experimentally tested whether a video intervention teaching Self-Determination-Theory-based communication strategies increases need-supportive communication strategy use over one week (Study 1, N = 76) and perceived need support, engagement, and goal attainment in a behavior change intervention supported by a forum-based online community (Study 2, N = 537). In Study 2, participants chose a goal (increasing either fruit or vegetable consumption or increasing moderate or vigorous physical activity) and joined an online community for 2 weeks. Data from both experiments were analyzed with mixed models and follow-up tests. Results: In Study 1, participants in the intervention but not in the control group showed an increase in the number of needsupportive communication strategies used both immediately and one week after the intervention (condition × time interaction, partial η2 = 0.31). In Study 2, participants who watched the intervention video had a higher number of postings and reported a higher subjective forum use frequency (but not a higher number of logins) compared to participants who watched the control video. However, the effect on the subjective forum visit frequency was not robust. There were no intervention effects on perceived need support, goal attainment, or secondary outcomes. The results might be explained by low application of need-supportive communication strategies. Conclusion: A brief video intervention may be a suitable, low-cost intervention to promote need-supportive communication strategy use, benefitting both engagement and behavior change. Future studies should incorporate additional means to further improve communication strategy uptake and engagement in online communities.
关键词：Social networking sites;online communities;behavior change interventions;need-support;self-determination theory
