Early Cardiac Dysfunction in Adolescents With Low Vigorous Physical Activity.
Burden SJ., Zare N., Rider OJ., Dawes H., Jones A.
BACKGROUND: Adverse left ventricular diastolic function (LVDF) is an early marker of cardiac dysfunction that worsens with age and can lead to heart failure. It is unclear when this deterioration begins and whether physical activity (PA) influences it. We assessed the independent relationships of adverse LVDF in adolescents with different PA intensities, compared to the association with adiposity. The impact of adverse LVDF from low PA on cardiorespiratory fitness was examined. METHODS: In 127 adolescents (aged 11-18 years), we assessed LVDF by echocardiography, 7-day PA by wrist-worn accelerometry, adiposity Z scores by bioimpedance, and peak oxygen consumption by cardiopulmonary exercise testing (OxSOCRATES [Oxfordshire Sedentariness, Obesity, and Cardiometabolic Risk in Adolescents: A Trial of Exercise in Schools] study; NCT04118543). Adverse LVDF was defined using a body surface area-adjusted septal early diastolic tissue peak velocity Z score (