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The Journal of Sports Medicine and Physical Fitness 2020 Mar 04

DOI: 10.23736/S0022-4707.20.10279-2

Copyright © 2020 EDIZIONI MINERVA MEDICA

lingua: Inglese

Cardiorespiratory fitness, adiposity, and ambulatory blood pressure in adolescents

Eunduck PARK 1 , Devin C. VOLDING 2, 3, Wendell C. TAYLOR 4, Wenyaw CHAN 4, Janet C. MEININGER 4, 5

1 Harris College of Nursing and Health Sciences, Texas Christian University, Fort Worth, TX, USA; 2 Houston Methodist Hospital, Houston, TX, USA; 3 Stephen F. Austin State University, Nacogdoches, TX, USA; 4 School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX, USA; 5 Cizik School of Nursing, The University of Texas Health Science Center at Houston, Houston, TX, USA


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BACKGROUND: This study examined the association of cardiorespiratory fitness (fitness) and adiposity (body mass index [BMI] and waist circumference [WC]) with ambulatory blood pressure (ABP) and tested the moderating effect of adiposity on the association between fitness and ABP.
METHODS: A cross-sectional study was conducted with 370 adolescents aged 11-16 years. Fitness was assessed by a height-adjusted step test and estimated by heart rate recovery, defined as the difference between peak heart rate during exercise and heart rate two minutes post- exercise. Adiposity was measured using dichotomized values for percentiles of BMI (≥ 5th) and WC (≥ 50th). ABP was measured every 30-60 minutes over 24 hours on a school day. Mixed- effects regression analysis was used.
RESULTS: Each unit increase in fitness was associated with a decrease of systolic blood pressure (SBP) [-0.058 mmHg, P = 0.001] and diastolic blood pressure (DBP) [-0.043
mmHg, P < 0.001] after adjustment for WC and covariates. Each unit increase in fitness was associated with a decrease in SBP [-0.058 mmHg, P = 0.001] and DBP [-0.045 mmHg, P < 0.001] after adjustment for BMI and covariates. Fitness and BMI ≥ 85th percentile (or WC ≥
50th percentile) interactions were not associated with ABP after adjustment for covariates. CONCLUSIONS: Our findings indicate a small but statistically significant inverse effect of fitness on ABP in adolescents. No evidence of a modifying effect of adiposity on this association suggesting that fitness and weight management have essential roles for maintaining lower ABP in adolescents.


KEY WORDS: Cardiorespiratory fitness; Blood pressure monitoring, ambulatory; Adiposity; Hypertension; Adolescent

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