{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T22:21:10Z","timestamp":1761171670219,"version":"build-2065373602"},"reference-count":38,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2025,9,28]],"date-time":"2025-09-28T00:00:00Z","timestamp":1759017600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The aim of this study was to examine the impact of a short school\u2010based personalized interval training program (METs\u2010Up) using a smartphone application on cardiorespiratory fitness (CRF) in French adolescents. Secondary objective was to assess the effects of the program on body mass index (BMI). A total of 9021 adolescents (4428 boys and 4593 girls, age range: 10\u201314\u2009years) were randomized to the experimental group (EXP) (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20095845) or the control group (CON) (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20093176). The EXP performed a personalized high\u2010intensity interval training (HIIT) program ranging (95.5 to 102.5% dynamic maximal aerobic speed, MAS) integrated into physical education (PE) lessons over 6\u2009weeks. HIIT consisted of approximately two 15\u2010min sessions per week of high\u2010intensity, intermittent\u2010running exercises. The CON group followed conventional PE lessons. CRF (20\u2010m Shuttle Run Test) and BMI were measured at baseline and after 6\u2009weeks. After 6\u2009weeks, both groups showed significant improvements in CRF compared to baseline value (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). The increase in the EXP group (13.7% in laps completed) was significantly higher than in the CON group (4.8%) (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). Additionally, a significant decrease in BMI was observed in the EXP (\u22120.8%), whereas no significant change was observed in the CON group. A short school\u2010based personalized METs\u2010Up HIIT program, utilizing an innovative smartphone application, significantly improved CRF in French adolescents, addressing the decline in CRF levels among youth.\n                  <\/jats:p>","DOI":"10.1111\/sms.70141","type":"journal-article","created":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T03:28:01Z","timestamp":1759116481000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Impact of Digital School\u2010Based Personalized High\u2010Intensity Interval Training on Cardiorespiratory Fitness in French Adolescents: The\n                    <scp>METs<\/scp>\n                    \u2010Up Programme"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0570-1522","authenticated-orcid":false,"given":"J\u00e9r\u00e9my","family":"Vanhelst","sequence":"first","affiliation":[{"name":"INSERM, INRAE, CNAM, Center of Research in Epidemiology and Statistics (CRESS), nutritional Epidemiology Research Team (EREN) Universit\u00e9 Sorbonne Paris Nord and Universit\u00e9 Paris Cit\u00e9  Bobigny France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne","family":"Le Cunuder","sequence":"additional","affiliation":[{"name":"Laboratory Movement, Sport and Health Sciences, UFR STAPS University of Rennes 2  France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7158-386X","authenticated-orcid":false,"given":"Martine","family":"Duclos","sequence":"additional","affiliation":[{"name":"International Research Chair Health in Motion Clermont Auvergne University Foundation  Clermont\u2010Ferrand France"},{"name":"University Hospital Clermont\u2010Ferrand, Department of Sport Medicine and Functional Exploration Clermont Auvergne University, INRAE, UNH  Clermont\u2010Ferrand France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Mercier","sequence":"additional","affiliation":[{"name":"AGEIS Universit\u00e9 Grenoble\u2010Alpes  Grenoble France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fran\u00e7ois","family":"Carr\u00e9","sequence":"additional","affiliation":[{"name":"LTSI INSERM, U1099, University of Rennes 1, and Department of Sport Medicine Pontchaillou Hospital  Rennes France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,9,28]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/sj.ijo.0803774"},{"key":"e_1_2_10_3_1","first-page":"126","article-title":"Physical Activity, Exercise, and Physical Fitness: Definitions and Distinctions for Health\u2010Related Research","volume":"100","author":"Caspersen C. 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