engleski

The Associations of Physical Activity, Screen Time and Sleep With High Blood Pressure in Adolescents

Introduction: the aim of this study was to explore associations of physical activity (PA), screen time (ST) and sleep duration with high blood pressure (BP) in 15-year old adolescents. Methods: This investiga- tion is a part of the CRO-PALS study, an observational longitudinal study conducted in a representative sample of urban youth in Zagreb (Croatia). CRO-PALS involves 903 adolescents and for the purpose of this study data from 819 participants (mean age [SD]=15.6[0.3] years) with information on PA, ST, sleep and BP were analysed. Data on the weekly duration of PA and average daily time spent in front of screens 24 16th ANNUAL SCIENTIFIC CONFERENCE OF MONTENEGRIN SPORTS ACADEMY were collected using a computerised version of the SHAPES questionnaire (Wong et al., 2006), while BP was measured following ESH guidelines (O’Brien et al., 2003). Average sleep duration was self- reported separately for school week and weekends. Participants were divided in quartiles of PA, ST and sleep, and high BP was defined as systolic BP and/or diastolic BP exceeding 95th percentile for age, sex and height (National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescents, 2004). Associations of PA, ST and sleep with elevated BP were explored using multiple logistic regression adjusting for school type, maturation and smoking. All analyses were stratified by sex. Results: The prevalence of high blood pressure amounted to 27.0 % (CI=22.8-31.1%) in boys and 21.6 % (CI=17.6- 25.6%) in girls. Physical activity duration and screen time were unrelated to abnormal BP in either boys or girls. Odds for having high blood pressure did not differ between children across quartiles of weekly quantity of PA (p=0.50-0.60 in boys, and p=0.67-0.75 in girls) or quartiles of screen time (p=0.16-0.50 in boys, and p=0.44-0.70 in girls). Conversely, while sleep duration was not associated with high BP in girls, in boys short sleep duration (<7:15h) was linked with 120% higher odds of having elevated BP compared with >8:45h of sleep (OR=2.2, 95%CI=1.2-4.2, p=0.016). Discussion: High BP was highly prevalent in Croatian urban youth. Neither high self- reported PA nor low ST proved to be protective of high BP. Still, inadequate sleep duration was linked with 2.2 higher odds for raised BP, although this association was noted only in boys. Other factors, such as excess weight, sodium in- take or psychological stress, might have a more important role in elevated blood pressure in adolescents. Acknowledgements: This investigation is a part of the Croatian Physical Activity in Adolescence Longi- tudinal Study (CRO-PALS), funded by the Croatian Science Foundation under the number IP-06- 2016- 9926. References: Wong SL, Leatherdale ST, Manske SR. Med Sci Sports Exerc. 2006 ; 38(9):1593-600. O’Brien E, Asmar R, Beilin L et al. J Hypertens. 2003 ; 21:821–848. National High Blood Pressure Edu- cation Program Working Group on High Blood Pressure in Children and Adolescents. Pediatrics. 2004 ; 114(2 Suppl 4th Report):555-76

children ; hypertension ; sport

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