{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,11]],"date-time":"2026-11-11T05:23:28Z","timestamp":1794374608279,"version":"4.9.0"},"reference-count":52,"publisher":"JMIR Publications Inc.","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JMIR Pediatr Parent"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec sec-type=\"background\">\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>The increasing prevalence of physical inactivity and insufficient sleep in adolescents likely contribute to worsening cardiometabolic and mental health. However, obtaining accurate behavioral measures is a challenge. Consumer wearable devices offer a user-friendly method to assess physical activity and sleep.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec sec-type=\"objective\">\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>This study aimed to describe the process and the preliminary results of physical activity and sleep collected using a consumer wearable Fitbit device in an adolescent cohort.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec sec-type=\"methods\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We provided Fitbit Charge 2\n                      <jats:sup\/>\n                      or Charge 3\n                      <jats:sup\/>\n                      wrist-worn activity monitors to adolescent participants in Project Viva, a Boston, Massachusetts area cohort, from 2017 to 2022. We invited participants to wear the devices for \u22657 days for 24 hours a day to measure their physical activity, heart rate, and sleep, and allowed them to keep the device as a participation incentive.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec sec-type=\"results\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>We collected over 7 million minutes of physical activity, heart rate, and sleep data from 677 participants,  female. The mean (SD) age of participants was 17.7 (0.7) years. Among the 677 participants,  were non-Hispanic White,  non-Hispanic Black,  were Hispanic,  non-Hispanic Asian, and  belonged to other races. Participants demonstrated a high adherence to the research protocol, with the mean (SD) wear duration of 7.5 (1.1) days, and 90% of participants (612\/677) had 5 or more days wearing the device for &gt;600 minutes\/day. The mean (SD) number of steps was 8883 (3455) steps\/day and the mean (SD) awake sedentary time was 564 (138) minutes\/day. Male participants were more often engaged in very active (27 minutes\/day) and moderately active physical activity (29 minutes\/day) compared with female participants (15 and 17 minutes\/day, respectively). Over 87% (588\/677) of participants had sleep data available for 5 or more days, among whom the average nightly sleep duration was 7.9 (SD 0.9) hours.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec sec-type=\"conclusions\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This study demonstrated the feasibility of using consumer wearable devices to measure physical activity and sleep in a cohort of US adolescents. The high compliance rates provide valuable insights into adolescent behavior patterns and their influence on chronic disease development and mental health outcomes.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2196\/59159","type":"journal-article","created":{"date-parts":[[2024,12,18]],"date-time":"2024-12-18T08:41:51Z","timestamp":1734511311000},"page":"e59159-e59159","source":"Crossref","is-referenced-by-count":8,"title":["Using a Consumer Wearable Activity Monitoring Device to Study Physical Activity and Sleep Among Adolescents in Project Viva: Cohort Study"],"prefix":"10.2196","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-3236-5833","authenticated-orcid":false,"given":"Yutong","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6967-1730","authenticated-orcid":false,"given":"Nicole","family":"Bornkamp","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7752-2585","authenticated-orcid":false,"given":"Marie-France","family":"Hivert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2513-3339","authenticated-orcid":false,"given":"Emily","family":"Oken","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2858-1973","authenticated-orcid":false,"given":"Peter","family":"James","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1010","published-online":{"date-parts":[[2025,2,4]]},"reference":[{"key":"R1","unstructured":"Physical activity facts. 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