期刊
JOURNAL OF SPORT AND HEALTH SCIENCE
卷 12, 期 2, 页码 194-201出版社
SHANGHAI UNIV SPORT
DOI: 10.1016/j.jshs.2021.01.010
关键词
Adolescents; Cardiometabolic health; Exercise tolerance; Heart rate; Obesity
Cardiac chronotropic incompetence (CI) is prevalent in obese adolescents and is associated with systemic inflammation and exercise intolerance.
Background: Adults with obesity may display disturbed cardiac chronotropic responses during cardiopulmonary exercise testing, which relates to poor cardiometabolic health and an increased risk for adverse cardiovascular events. It is unknown whether cardiac chronotropic incompetence (CI) during maximal exercise is already present in obese adolescents and, if so, how that relates to cardiometabolic health.Methods: Sixty-nine obese adolescents (body mass index standard deviation score = 2.23 +/- 0.32, age = 14.1 +/- 1.2 years; mean +/- SD) and 29 lean adolescents (body mass index standard deviation score = -0.16 +/- 0.84, age = 14.0 +/- 1.5 years) performed a maximal cardiopulmonary exercise testing from which indicators for peak performance were determined. The resting heart rate and peak heart rate were used to calculate the maximal chronotropic response index. Biochemistry (lipid profile, glycemic control, inflammation, and leptin) was studied in fasted blood samples and during an oral glucose tolerance test within obese adolescents. Regression analyses were applied to examine associations between the presence of CI and blood or exercise capacity parameters, respectively, within obese adolescents.Results: CI was prevalent in 32 out of 69 obese adolescents (46%) and 3 out of 29 lean adolescents (10%).C-reactive protein was significantly higher in obese adolescents with CI compared to obese adolescents without CI (p = 0.012). Furthermore, peak oxygen uptake and peak cycling power output were significantly reduced (p < 0.05) in obese adolescents with CI vs. obese adolescents without CI. The chronotropic index was independently related to blood total cholesterol (standardized coefficient b = -0.332; p = 0.012) and C-reactive protein concentration (standard-ized coefficient b = -0.269; p = 0.039).Conclusion: CI is more common in the current cohort of obese adolescents, and is related to systemic inflammation and exercise intolerance.
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