Abstract
This study aimed to analyze the associations between sedentary behavior, physical activity (PA), and cardiorespiratory fitness (CRF), with carotid intima-media thickness (cIMT), a marker of atherosclerosis already present at an early stage among obese adolescents. The associations between anthropometric measures, sedentary time, PA, CRF, and cIMT of 54 Caucasian obese adolescents were analyzed using partial correlations (controlling for age and sex) and multiple linear regressions. Differences between participants with and without a healthy CRF were also analyzed using independent sample t test. Sedentary time did not correlate with any of the variables. Light physical activity correlated positively with mean cIMT (r(38) = 0.36, p = 0.024). Moderate physical activity (MPA) correlated positively with both mean (r(38) = 0.37, p = 0.018) and maximum (r(38) = 0.33, p = 0.039) cIMT. CRF was inversely associated with mean cIMT (r(40) = −0.36, p = 0.019), even when controlling for sedentary time (r(37) = −0.35, p = 0.030). The best predictors of cIMT were MPA and weight. No significant differences in cIMT were found between participants with healthy and unhealthy CRF.
Conclusion: Although we need to be cautious due to the limitations of the study, the results suggest that despite the importance of decreasing sedentary time, increasing PA intensity may be more effective in improving endothelial structural health among obese adolescents.
What is Known: • Pediatric obesity is associated with increased carotid intima-media thickness (cIMT). • Physical activity may have a relevant role in cIMT development. |
What is New: • Cardiorespiratory fitness (CRF) may be a key moderator of this process. • Inherited CRF may be protective against cIMT development in obese adolescents. |
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Abbreviations
- BMI:
-
Body mass index
- cIMT:
-
Carotid intima-media thickness
- CRF:
-
Cardiorespiratory fitness
- LPA:
-
Light physical activity
- MPA:
-
Moderate physical activity
- MVPA:
-
Moderate-to-vigorous physical activity
- PA:
-
Physical activity
- SR:
-
Shuttle run
- VPA:
-
Vigorous physical activity
- WC:
-
Waist circumference
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Acknowledgments
The original trial is registered in clinicaltrials.gov (NCT02024061), and was funded by the Foundation of Science and Technology (FCT—Fundação para a Ciência e a Técnologia, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal. Tel. 213924300, Fax. 213907481) (PTDC/DES/113591/2009).
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Author contributions
This research was conceived and directed by HF, AP, and SM. LP performed all the cIMT assessments. AA performed the data analysis and contributed in the CRF and anthropometric assessments. All authors contributed to writing and reviewing the manuscript and approved the manuscript prior to submission. Each of our authors meets the standard criteria for authorship.
Ethical statement
This study was approved by the research ethics committee of the Faculty of Medicine of the University of Lisbon, Portugal, and is in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all participants included in the study.
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Communicated by Jaan Toelen
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Ascenso, A., Palmeira, A., Pedro, L.M. et al. Physical activity and cardiorespiratory fitness, but not sedentary behavior, are associated with carotid intima-media thickness in obese adolescents. Eur J Pediatr 175, 391–398 (2016). https://doi.org/10.1007/s00431-015-2654-x
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DOI: https://doi.org/10.1007/s00431-015-2654-x