Daily Activity and Artery Health in Young Adults

Researchers wanted to understand how the way young adults spend their day moving around, sitting, and sleeping might be linked to the thickness of the arteries that carry blood to the heart and brain. Arterial thickness is often used as an early sign of cardiovascular disease, so finding connections with everyday habits could help identify risk before symptoms appear.

The investigation included 327 healthy young adults, with an average age of twenty‑six years. These individuals were part of a long‑term health study that tracks various risk factors over time. They were selected because they represented a broad range of daily activity patterns.

To capture movement, each participant wore a wrist‑mounted accelerometer for seven consecutive days. The device recorded time spent in light activity, moderate‑to‑vigorous activity, sedentary behavior, and sleep. Artery thickness was then measured with ultrasound, providing separate values for the aorta and the carotid arteries.

The team applied a statistical technique that treats the 24‑hour day as a composition, allowing them to examine how reallocation of time between behaviors affects arterial thickness. After adjusting for sex, education, smoking, and the distribution of dietary fats, they found that a higher proportion of light activity was associated with lower aortic thickness. However, shifting time from sleep, sitting, or vigorous exercise to light activity did not produce statistically significant changes. No associations were observed for carotid thickness.