Vascular aging in the young: New carotid stiffness centiles and association with general and abdominal obesity - The KIGGS cohort.

BACKGROUND AND AIMS: The evidence for an association between obesity and increased carotid intima-media thickness (CIMT) and carotid stiffness (CS) in the young has been limited by methodological challenges related to study populations, measurements, methods of percentile derivation and comprehensiveness of obesity markers investigated. This nationwide general population study developed new CS and CIMT centiles in the young and used them to study associations with body mass index, waist circumference, waist-to-height-ratio, bioimpedance-derived absolute and relative fat mass, fat-free mass, subscapular skinfold thickness and blood pressure. METHODS: In its 11-year follow-up, the KiGGS cohort, which is based on a nationally representative sample, included semi-automated state-of-the-art sonographic CIMT and CS measurements in 4,709 participants aged 14 to 28. Distensibility coefficient (DC), stiffness index ß, Young's elastic modulus (YEM) and Peterson's elastic modulus (Ep) centiles were modelled by sex, age and height simultaneously. RESULTS: CS increased with age in both sexes, and young men had stiffer arteries than young women at all ages. All obesity measures at baseline and at follow-up, except for subscapular skinfold thickness, were positively associated with several CS parameters with moderate relative risks (RR), e.g. cross-sectional RR 2.23 (95% CI 1.26-3.93) for DC ≥ 90th percentile when waist circumference ≥90th percentile; RR 5.98 (3.38-10.56) for elevated DC associated with simultaneously elevated waist circumference and BP. CONCLUSIONS: These new state-of-the-art CS percentiles show consistent associations of obesity with CS in the young and support primary prevention efforts starting at a young age.