{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T12:16:12Z","timestamp":1788869772742,"version":"build-2803163510"},"reference-count":43,"publisher":"BMJ","issue":"9","license":[{"start":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T00:00:00Z","timestamp":1788825600000},"content-version":"unspecified","delay-in-days":7,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Ministry of Education of China (MOE) Project of Humanities and Social Sciences","award":["25YJA890036"],"award-info":[{"award-number":["25YJA890036"]}]},{"name":"Ningbo Education Science Planning Programme","award":["2026YZD31"],"award-info":[{"award-number":["2026YZD31"]}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2026,8,25]]},"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Schools are key settings to intervene for the purpose of health promotion in children. However, the effectiveness of school-based interventions remains limited, potentially related to the obesogenic behaviours observed during holidays as posited by the structured days hypothesis. This study aims to evaluate the feasibility, process evaluation and preliminary efficacy of the keep moving in a structured summer (KEMOSS) intervention among Chinese children.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and analysis<\/jats:title>\n                    <jats:p>The KEMOSS intervention is an 8-week hybrid programme comprising two digitally supported home-based phases (weeks 1\u20132\u2009and 7\u20138)\u2009and a structured school-based phase (weeks 3\u20136). The school-based phase will be a full-day scheduled programme that replicates the routine of regular school days, with a coach-led structured physical activity lesson and a free-play lesson embedded in the morning and afternoon, respectively. During the home-based phases, participants will be encouraged to complete prescribed exercises independently with support from mHealth reminders and instructional materials and to achieve a minimum of 10\u2009000 steps per day. Feasibility, process evaluation and preliminary efficacy outcomes will be assessed using a mixed-methods approach. Quantitative data will be analysed using SPSS, while qualitative data from interviews and focus groups will be analysed thematically using NVivo.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Ethics and dissemination<\/jats:title>\n                    <jats:p>Ethical approval has been obtained from the Ningbo University Ethics Committee (TY2026028). Findings will inform the refinement of the intervention and the design of a future definitive trial. Results will be disseminated through peer-reviewed publications and conference presentations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial registration number<\/jats:title>\n                    <jats:p>ChiCTR2600126738.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2026-123307","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T12:00:39Z","timestamp":1788868839000},"page":"e123307","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["School- and home-based hybrid exercise intervention to prevent summer fitness loss in children: protocol for a feasibility study of the keep moving in a structured summer programme"],"prefix":"10.1136","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3649-5064","authenticated-orcid":false,"given":"Yong","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Sports and Arts, Zhejiang Wanli University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayi","family":"Gu","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minghui","family":"Li","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang","family":"Guo","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renshang","family":"Geng","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lulin","family":"Dai","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peizhen","family":"Xiao","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanyuan","family":"Zheng","sequence":"additional","affiliation":[{"name":"Faculty of Sports Science, Ningbo University, Ningbo, Zhejiang, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-5539-721X","authenticated-orcid":false,"given":"Fucheng","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Physical Education, Nanjing Agricultural University, Nanjing, Jiangsu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"key":"2026090805002145000_16.9.e123307.1","article-title":"School-based physical activity programs for promoting physical activity and fitness in children and adolescents aged 6 to 18","volume":"9","author":"Neil-Sztramko","year":"2021","journal-title":"Cochrane Database Syst Rev"},{"key":"2026090805002145000_16.9.e123307.2","doi-asserted-by":"crossref","DOI":"10.2196\/22601","article-title":"Effects of Smartphone-Based Interventions on Physical Activity in Children and Adolescents: Systematic Review and Meta-analysis","volume":"9","author":"He","year":"2021","journal-title":"JMIR Mhealth Uhealth"},{"key":"2026090805002145000_16.9.e123307.3","doi-asserted-by":"crossref","DOI":"10.1186\/s12966-020-01037-z","article-title":"2020 WHO guidelines on physical activity and sedentary behaviour for children and adolescents aged 5-17\u2009years: summary of the evidence","volume":"17","author":"Chaput","year":"2020","journal-title":"Int J Behav Nutr Phys Act"},{"key":"2026090805002145000_16.9.e123307.4","doi-asserted-by":"publisher","DOI":"10.1016\/j.jad.2021.02.026"},{"key":"2026090805002145000_16.9.e123307.5","doi-asserted-by":"crossref","DOI":"10.1136\/bmj.e5888","article-title":"Effectiveness of intervention on physical activity of children: systematic review and meta-analysis of controlled trials with objectively measured outcomes (EarlyBird 54)","volume":"345","author":"Metcalf","year":"2012","journal-title":"BMJ"},{"key":"2026090805002145000_16.9.e123307.6","doi-asserted-by":"crossref","first-page":"859","DOI":"10.1111\/obr.12823","article-title":"Are school-based physical activity interventions effective and equitable? 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