Activity snacks completed by participants.

Background
Public health guidance acknowledges the benefits of physical activity of any duration. We have proposed a whole-day approach to promoting physical activity called Snacktivity™, which encourages frequent 2–5 minute ‘activity snacks’ of moderate-to-vigorous intensity.
Methods
Using repeated semi-structured interviews and a think aloud protocol, this study aimed to understand participants’ experiences of integrating Snacktivity™ into daily life, to provide insights to refine the delivery of Snacktivity™ interventions. Physically inactive adults recruited via primary care and a community health service engaged with an intervention to encourage Snacktivity™ over three weeks, which included using a Fitbit and linked mobile phone app (SnackApp). Participants took part in semi-structured interviews on two occasions during the intervention, with a sub-group participating in a think aloud study. Three study data sets were generated and independently explored using inductive thematic analysis, with findings combined into a single set of themes.
Results
Eleven adults participated in the interview study who were interviewed twice (total interviews completed n = 21, 1 participant declined the second interview), of whom six completed the think aloud study (total voice recordings n = 103). Three main themes emerged from the combined data; lived experience of participating in Snacktivity™, motivation for Snacktivity™ and experiences with the Snacktivity™ technology. Participants undertook a variety of activity snacks, utilising their environment, which they believed improved their psychological wellbeing. Participants were enthusiastic about Snacktivity™, with some stating that activity snacks were more accessible than traditional exercise, but perceived they were often prevented from doing so in the presence of others. Participants were mostly enthusiastic about using the Snacktivity™ technology.
Conclusion
Participants were able to incorporate Snacktivity™ into their lives, particularly at home, and found this approach acceptable. Participants felt they experienced health benefits from Snacktivity™ although barriers to participation were reported. This study offers insights for translating guidance into practice and supporting people to become more physically active.

背景
公共卫生指南已证实，任意时长的身体活动均具有健康益处。本研究提出了一种名为活动零食法（Snacktivity™）的全天身体活动推广方案，该方案鼓励参与者进行频次密集的2~5分钟中等至高强度「活动零食（activity snacks）」。
方法
本研究采用重复半结构化访谈与有声思维实验方案，旨在探究参与者将活动零食法融入日常生活的体验，为优化该干预方案的落地实施提供科学依据。研究通过基层医疗与社区卫生服务渠道招募身体活动不足的成年人，开展为期三周的活动零食法推广干预，干预内容包括使用Fitbit设备及配套手机应用（SnackApp）。干预期间，所有参与者完成两次半结构化访谈，其中一个亚组参与有声思维研究。本研究生成了三套独立数据集，采用归纳式主题分析分别进行探究，最终将所有研究发现整合为一套统一的主题体系。
结果
本访谈研究共纳入11名成年人，其中10人完成两次访谈（总有效访谈次数为21次，1名参与者拒绝参与第二次访谈），6人完成有声思维研究（总语音记录条数为103条）。整合全部数据集后，共提炼出三大核心主题：活动零食法参与的亲身体验、活动零食法参与动机，以及活动零食法相关技术使用体验。参与者结合自身所处环境开展了多样的活动零食实践，认为此举可有效改善自身心理福祉。参与者整体对活动零食法持积极接纳态度，部分参与者表示活动零食相较于传统运动具备更高的可及性，但也有部分参与者提及，在他人在场的场景下往往难以开展活动零食。多数参与者对活动零食法相关技术的使用体验较为满意。
结论
参与者能够将活动零食法顺利融入日常生活，尤其在家中场景中应用更为普遍，且认为该方案具备良好的可接受性。尽管有部分参与者报告了参与活动零食法的相关障碍，但均认可该方案为自身带来了健康获益。本研究为将公共卫生指南转化为落地实践、助力人群提升身体活动水平提供了重要的理论参考与实践启示。