Cardiorespiratory Fitness, Adiposity, and Heart Rate Variability: The Coronary Artery Risk Development in Young Adults Study

Purpose The importance of cardiorespiratory fitness versus adiposity in determining heart rate variability (HRV) is unclear. Methods From the Coronary Artery Risk Development in Young Adults study, an observational cohort study, we included 2316 participants (mean age = 45.2 ± 3.6 yr at year 20, 57% female, 43% Black) with HRV measured in 2005–2006 (year 20) and graded exercise test duration (GXTd) and adiposity measures (body mass index and waist circumference) obtained in 1985–1986 (baseline) and 2005–2006. HRV measures (SD of all normal RR intervals [SDNN] and square root of the mean value of the squares of differences between all successive RR intervals [RMSSD]) were obtained from resting 30-s 12-lead ECG. Cross-sectional associations between GXTd, adiposity, and HRV were assessed at year 20. Longitudinal changes in GXTd and adiposity measures were categorized as ≥10% increase,
Source: Medicine and Science in Sports and Exercise - Category: Sports Medicine Tags: EPIDEMIOLOGY Source Type: research