T M Altenburg1, M de Niet2, M Verloigne3, I De Bourdeaudhuij4, O Androutsos5, Y Manios6, E Kovacs7, B Bringolf-Isler8, J Brug9, M J M Chinapaw10. 1. VU University Medical Center, EMGO Institute for Health and Care Research, Department of Public and Occupational Health, Amsterdam, The Netherlands. Electronic address: t.altenburg@vumc.nl. 2. Science Support, Utrecht, The Netherlands. Electronic address: markdeniet@gmail.com. 3. Ghent University, Department of Movement and Sport Sciences, Ghent, Belgium. Electronic address: Maite.Verloigne@Ugent.be. 4. Ghent University, Department of Movement and Sport Sciences, Ghent, Belgium. Electronic address: Ilse.Debourdeaudhuij@UGent.be. 5. Department of Nutrition-Dietetics, School of Health Science and Education, Harokopio University Athens, Athens, Greece. Electronic address: oandrou@hua.gr. 6. Department of Nutrition-Dietetics, School of Health Science and Education, Harokopio University Athens, Athens, Greece. Electronic address: manios@hua.gr. 7. Department of Paediatrics, University of Pécs, Pécs, Hungary. Electronic address: kovacs.eva.katalin@pte.hu. 8. Department of Epidemiology and Public Health, Swiss TPH, Basel, Switzerland; University of Basel, Basel, Switzerland. Electronic address: Bettina.Bringolf@unibas.ch. 9. VU University Medical Center, EMGO Institute for Health and Care Research, Department of Epidemiology & Biostatistics, Amsterdam, The Netherlands. Electronic address: j.brug@vumc.nl. 10. VU University Medical Center, EMGO Institute for Health and Care Research, Department of Public and Occupational Health, Amsterdam, The Netherlands. Electronic address: m.chinapaw@vumc.nl.
Abstract
OBJECTIVE: This study examined the occurrence and duration of sedentary bouts and explored the cross-sectional association with health indicators in children applying various operational definitions of sedentary bouts. METHODS: Accelerometer data of 647 children (10-13 years old) were collected in five European countries. We analyzed sedentary time (<100 cpm) accumulated in bouts of at least 5, 10, 20 or 30 min based on four operational definitions, allowing 0, 30 or 60s ≥100 cpm within bouts. Health indicators included anthropometrics (i.e. waist circumference and body mass index (BMI)) and in a subsample from two European countries (n=112) fasting capillary blood levels of glucose, C-peptide, high-density- and low-density cholesterol, and triglycerides. Data collection took place from March to July 2010. Associations were adjusted for age, gender, moderate-to-vigorous physical activity, total wear time and country. RESULTS: Occurrence of sedentary bouts varied largely between the various definitions. Children spent most of their sedentary time in bouts of ≥5 min while bouts of ≥20 min were rare. Linear regression analysis revealed few significant associations of sedentary time accumulated in bouts of ≥5-30 min with health indicators. Moreover, we found that more associations became significant when allowing no tolerance time within sedentary bouts. CONCLUSION: Despite a few significant associations, we found no convincing evidence for an association between sedentary time accumulated in bouts and health indicators in 10-13 year old children.
OBJECTIVE: This study examined the occurrence and duration of sedentary bouts and explored the cross-sectional association with health indicators in children applying various operational definitions of sedentary bouts. METHODS: Accelerometer data of 647 children (10-13 years old) were collected in five European countries. We analyzed sedentary time (<100 cpm) accumulated in bouts of at least 5, 10, 20 or 30 min based on four operational definitions, allowing 0, 30 or 60s ≥100 cpm within bouts. Health indicators included anthropometrics (i.e. waist circumference and body mass index (BMI)) and in a subsample from two European countries (n=112) fasting capillary blood levels of glucose, C-peptide, high-density- and low-density cholesterol, and triglycerides. Data collection took place from March to July 2010. Associations were adjusted for age, gender, moderate-to-vigorous physical activity, total wear time and country. RESULTS: Occurrence of sedentary bouts varied largely between the various definitions. Children spent most of their sedentary time in bouts of ≥5 min while bouts of ≥20 min were rare. Linear regression analysis revealed few significant associations of sedentary time accumulated in bouts of ≥5-30 min with health indicators. Moreover, we found that more associations became significant when allowing no tolerance time within sedentary bouts. CONCLUSION: Despite a few significant associations, we found no convincing evidence for an association between sedentary time accumulated in bouts and health indicators in 10-13 year old children.
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