Marjaana Tikanmäki1,2, Tuija Tammelin3, Nina Kaseva1, Marika Sipola-Leppänen1,2,4, Hanna-Maria Matinolli1,2, Harto Hakonen3, Ulf Ekelund5, Johan G Eriksson1,6,7, Marjo-Riitta Järvelin8,9,10,11, Marja Vääräsmäki4,12, Eero Kajantie1,4,13. 1. Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Oulu and Helsinki, Finland. 2. Institute of Health Sciences, University of Oulu, Oulu, Finland. 3. LIKES Research Center for Physical Activity and Health, Jyväskylä, Finland. 4. PEDEGO Research Unit (Research Unit for Pediatrics, Dermatology, Clinical Genetics, Obstetrics and Gynecology), Medical Research Center Oulu (MRC Oulu), Oulu University Hospital and University of Oulu, Oulu, Finland. 5. Department of Sport Medicine, Norwegian School of Sport Sciences, Oslo, Norway. 6. Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland. 7. Folkhälsan Research Center, Helsinki, Finland. 8. Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment & Health, School of Public Health, Imperial College London, United Kingdom. 9. Faculty of Medicine, Center for Life Course Epidemiology, University of Oulu, Oulu, Finland. 10. Biocenter Oulu, Oulu, Finland. 11. Unit of Primary Care, Oulu University Hospital, Oulu, Finland. 12. Department of Welfare, Children, Adolescents and Families Unit, National Institute for Health and Welfare, Oulu, Finland. 13. Children's Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland.
Abstract
BACKGROUND: Young adults born preterm have higher levels of cardio metabolic risk factors and they report less physical activity than their peers born at term. Physical activity provides important cardio metabolic health benefits. We hypothesized that objectively measured physical activity levels are lower and time spent sedentary is higher among preterm-born individuals compared with controls. METHODS: We studied unimpaired participants of the ESTER birth cohort study at age 23.3 y (SD: 1.2): 60 born early preterm (<34 wk), 108 late preterm (34-36 wk), and 178 at term (controls). Physical activity and sedentary time were measured by hip-worn accelerometer (ActiGraph). RESULTS: As compared with controls' (mean physical activity, 303 counts per minute (cpm; SD 129)), physical activity was similar among adults born early preterm (mean difference = 21 cpm, 95% CI -61, 19) or late preterm (5 cpm, -27, 38). Time spent sedentary was also similar. Adjustments for early life confounders or current mediating characteristics did not change the results. CONCLUSION: In contrast to our hypothesis, we found no difference in objectively measured physical activity or time spent sedentary between adults born preterm and at term. The previously reported differences may be limited to physical activity captured by self-report.
BACKGROUND: Young adults born preterm have higher levels of cardio metabolic risk factors and they report less physical activity than their peers born at term. Physical activity provides important cardio metabolic health benefits. We hypothesized that objectively measured physical activity levels are lower and time spent sedentary is higher among preterm-born individuals compared with controls. METHODS: We studied unimpaired participants of the ESTER birth cohort study at age 23.3 y (SD: 1.2): 60 born early preterm (<34 wk), 108 late preterm (34-36 wk), and 178 at term (controls). Physical activity and sedentary time were measured by hip-worn accelerometer (ActiGraph). RESULTS: As compared with controls' (mean physical activity, 303 counts per minute (cpm; SD 129)), physical activity was similar among adults born early preterm (mean difference = 21 cpm, 95% CI -61, 19) or late preterm (5 cpm, -27, 38). Time spent sedentary was also similar. Adjustments for early life confounders or current mediating characteristics did not change the results. CONCLUSION: In contrast to our hypothesis, we found no difference in objectively measured physical activity or time spent sedentary between adults born preterm and at term. The previously reported differences may be limited to physical activity captured by self-report.
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