{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T08:57:50Z","timestamp":1774342670130,"version":"3.50.1"},"reference-count":38,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2010,8,18]],"date-time":"2010-08-18T00:00:00Z","timestamp":1282089600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J Hum Biol"],"published-print":{"date-parts":[[2010,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives:<\/jats:title><jats:p>The purpose of this study was to determine the sex\u2010specific physical activity (PA) intensity thresholds that best discriminate between unhealthy\/healthy cardiorespiratory fitness (CRF).<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold> Participants included 1,808 adolescents (964 girls), aged 12.5\u201317.5 years, from the HELENA study. We measured PA by accelerometer and calculated the time spent at light, moderate, vigorous, and moderate\u2010to\u2010vigorous (MVPA) intensities. CRF was assessed by the 20\u2010m shuttle\u2010run test. Adolescents were dichotomized (unhealthy\/healthy) based on sex\u2010 and age\u2010specific FITNESSGRAM standards. Receiver operating characteristic (ROC) analysis was used to determine thresholds that best discriminate between CRF categories.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> ROC analyses revealed that the PA thresholds that best discriminate between unhealthy\/healthy CRF were \u2265152, \u226533, \u226513, and \u226552 min\/day in light, moderate, vigorous, and MVPA, respectively. In boys, the PA thresholds associated with a healthy CRF were \u226537, \u226519, and \u226556 min\/day in moderate, vigorous, and MVPA, respectively, whereas in girls were \u2265152, \u226534, \u226512, and \u226551 min\/day in light, moderate, vigorous, and MVPA, respectively. Spending at least 60 min\/day in MVPA was also associated with a healthy CRF (odds ratios: 1.75, 1.94, and 1.57, all <jats:italic>P<\/jats:italic> &lt; 0.05, for the whole sample, boys, and girls, respectively).<\/jats:p><jats:p><jats:bold>Conclusions:<\/jats:bold> This study shows sex\u2010 and intensity\u2010specific PA thresholds to discriminate between adolescents with a healthy CRF from those with a less favorable or unhealthy CRF level. Journal of Hospital Medicine. Society of Hospital Medicine. Am. J. Hum. Biol., 2010. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajhb.21076","type":"journal-article","created":{"date-parts":[[2010,8,18]],"date-time":"2010-08-18T13:55:29Z","timestamp":1282139729000},"page":"750-756","source":"Crossref","is-referenced-by-count":50,"title":["Recommended levels and intensities of physical activity to avoid low\u2010cardiorespiratory fitness in European adolescents: The HELENA study"],"prefix":"10.1002","volume":"22","author":[{"given":"David","family":"Martinez\u2010Gomez","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jonatan R.","family":"Ruiz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francisco B.","family":"Ortega","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose 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