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24-h Systolic blood pressure and heart rate recordings in lean and obese adolescents

Journal article
Authors Jenny Framme
Frida Dangardt
Staffan Mårild
Walter Osika
P. Wahrborg
Peter Friberg
Published in Clin Physiol Funct Imaging
Volume 26
Issue 4
Pages 235-9
ISSN 1475-0961 (Print)
Publication year 2006
Published at Institute of Medicine, Department of Molecular and Clinical Medicine
Institute of Clinical Sciences
Pages 235-9
Language en
Links www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords Adolescent, *Blood Pressure, *Blood Pressure Monitoring, Ambulatory, Body Mass Index, Body Weight, Child, Circadian Rhythm, Cohort Studies, Female, *Heart Rate, Humans, Leisure Activities, Male, Obesity, Schools
Subject categories Medical and Health Sciences

Abstract

OBJECTIVE: We assessed the hypothesis that differences in day and night-time systolic blood pressure (SBP) and heart rate (HR) recordings were smaller in obese versus lean children and adolescents, and whether measurements obtained during a school week or during weekends or holidays influenced these nocturnal falls. We also wanted to determine whether the results were influenced by gender. METHODS: Ambulatory 24-h BP and HR measurements were performed in 80 subjects, 51 girls and 29 boys. Lean (n = 25) and obese (n = 55) subjects were classified according to body mass index (BMI)-standard deviation (SD) criteria. Forty-eight subjects had their 24-h recordings performed during a school week and 32 during leisure time. RESULTS: The SBP nocturnal dipping response was less pronounced in obese subjects (16.2 +/- 6.3 mmHg) compared with lean controls (21.1 +/- 5.7 mmHg) (P < 0.01) of which the girls constituted most of the difference. HR change between day and night was similar in both groups being approximately 15 b/min. A small but statistical negative correlation was observed between BMI-SD and nocturnal fall in SBP (r = -0.3, P = 0.0065). In all subjects, regardless of BMI-SD, daytime SBP was higher when readings were obtained during a school week (123 +/- 7 mmHg) than during weekends or holidays (119 +/- 7 mmHg) (P = 0.029). CONCLUSION: Obese children and adolescents showed smaller nocturnal falls in SBP compared with lean subjects. This pattern may cause increased cardiovascular loading; thus, it may reflect an early sign of high blood pressure development and adds to cardiovascular risk in young obese individuals.

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