Objectives To examine the recruitment, retention, and preliminary effects of a Christmas themed physical activity intervention designed to increase participation in physical activity and decrease sedentary behaviour in inactive adults. Design Pilot randomised controlled trial. Setting Recruitment from social medial platforms, workplaces, and community groups in the UK. Participants 107 inactive adults (who did not meet the UK guidelines for physical activity) aged 18-75 years. Interventions The intervention consisted of an email sent to participants each day of Advent (1-24 December 2021), which contained a Christmas themed physical activity idea to be completed that day. Each physical activity idea was presented in three intensity formats, including Easy Elf (light intensity), Moderate Mrs Claus (moderate intensity), and Strenuous Santa (vigorous intensity). The comparator group received a leaflet about healthy living on the 1 December. Main outcome measures Participants were randomly assigned (2:1) to either the intervention or control and were masked to group allocation before randomisation. Primary outcomes were recruitment rate, retention, and weekly minutes of participation in self-reported moderate-to-vigorous intensity physical activity by use of the exercise vital signs questionnaire. Primary analysis compared change in minutes of moderate-to-vigorous intensity physical activity from baseline to weeks one, two, and three during the Active Advent intervention. Secondary outcomes were participation in muscle strengthening based physical activity (days per week), accelerometer measured moderate-to-vigorous intensity physical activity, light intensity physical activity, total physical activity, and sedentary time (minutes per day), and enjoyment of and adherence to the intervention. Results 323 individuals expressed interest in participating in the trial and 107 were randomly assigned to the intervention (n=71) or the comparator (n=36) group. The recruitment target (n=105) was reached within 19 days of starting recruitment. 23 (21%) of 107 participants were lost to follow-up. On average, the groups reported participation in similar minutes of moderate-to-vigorous intensity physical activity in weeks one and two. At week three, the adjusted mean difference between groups was 20.6 minutes of participation in moderate-to-vigorous intensity physical activity per week (95% confidence interval −29.7 to 70.9) in favour of the intervention group. Accelerometer data showed that the intervention group spent fewer minutes sedentary per day than comparators (mean difference −58.6 (−113.5 to −3.8)). Overall, 42 (70%) of 60 participants in the intervention group reported that they liked the intervention and 41 (69%) of 59 reported that they completed the Active Advent intervention ideas each day. Conclusions The public were interested to participate in a Christmas themed physical activity intervention during Advent, which might increase physical activity and reduce time sedentary. Enjoyment of, and adherence to the intervention shows the potential benefit that Christmas themed physical activity campaigns/initiatives might have for improving public health. Trial registration [ISRCTN12415556][1]. Data from the Active Advent study or the study materials are available from the corresponding author at g.j.biddle@lboro.ac.uk. All individual participant data will be available on request one year after publication of trial outcomes. The study protocol is available on request. All requests for data access will need to specify the planned use of data and will require approval from the trial investigator team and the sponsor before release. [1]: /external-ref?link_type=ISRCTN&access_num=ISRCTN12415556

中文翻译：

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一项以圣诞节为主题的体育活动干预措施，以增加降临节期间人们对体育活动的参与：试点随机对照试验

目的 检验旨在增加身体活动参与度和减少不运动的成年人的久坐行为的圣诞节主题身体活动干预的招募、保留和初步效果。设计试点随机对照试验。从英国的社交媒体平台、工作场所和社区团体进行招聘。参与者 107 名年龄在 18-75 岁之间的不爱运动的成年人（不符合英国的体育活动指南）。干预措施 干预措施包括在降临节（2021 年 12 月 1 日至 24 日）的每一天向参与者发送一封电子邮件，其中包含当天要完成的圣诞节主题体育活动创意。每个身体活动想法都以三种强度形式呈现，包括 Easy Elf（轻度强度）、Moderate Mrs Claus（中等强度）、和 Strenuous Santa（精力充沛的强度）。对照组在 12 月 1 日收到一份关于健康生活的传单。主要结果指标 参与者被随机分配 (2:1) 到干预组或对照组，并在随机化之前对组分配设盲。主要结果是通过使用运动生命体征问卷进行自我报告的中等强度到高强度身体活动的招募率、保留率和每周参与分钟数。主要分析比较了 Active Advent 干预期间从基线到第一周、第二周和第三周的中等强度到高强度身体活动分钟数的变化。次要结果是参与基于肌肉强化的身体活动（每周天数），加速度计测量中等到剧烈强度的身体活动，低强度体力活动、总体力活动和久坐时间（每天分钟数），以及对干预的享受和坚持。结果 323 人表示有兴趣参加试验，其中 107 人被随机分配到干预组 (n=71) 或比较组 (n=36)。在开始招募后的 19 天内达到了招募目标 (n=105)。107 名参与者中有 23 名 (21%) 失访。平均而言，这些小组报告在第一周和第二周参加了相似分钟的中等到剧烈强度的体育活动。在第三周，调整后的组间平均差异为每周 20.6 分钟参加中等强度到高强度的身体活动（95% 置信区间 -29.7 至 70.9），干预组优于干预组。加速度计数据显示，干预组每天静坐时间少于对照组（平均差 -58.6（-113.5 至 -3.8））。总体而言，干预组的 60 名参与者中有 42 名 (70%) 表示他们喜欢干预，59 名参与者中有 41 名 (69%) 表示他们每天完成 Active Advent 干预想法。结论 公众有兴趣在降临节期间参加以圣诞节为主题的身体活动干预，这可能会增加身体活动并减少久坐时间。享受和坚持干预表明圣诞节主题的身体活动运动/倡议可能对改善公众健康有潜在好处。试用注册 [ISRCTN12415556][1]。来自 Active Advent 研究或研究材料的数据可从相应的作者处获得，地址为 gjbiddle@lboro.ac.uk。所有个体参与者数据将在试验结果公布一年后应要求提供。研究方案可应要求提供。所有数据访问请求都需要指定数据的计划使用，并且需要在发布前获得试验研究人员团队和申办方的批准。[1]: /external-ref?link_type=ISRCTN&access_num=ISRCTN12415556