Effects of environmental noise exposure on 24-h ambulatory vascular properties in adults.

Exposure to environmental noise has been associated with hypertension, but the related mechanism of vascular structural changes is unclear. This repeated-measure study investigated the effects of noise exposure on the 24-h ambulatory vascular structural properties in 66 adults aged 18-32 years. Individual noise exposure and personal vascular parameters were measured simultaneously in all subjects. Linear mixed-effects regressions were used to estimate the effects. A 1-A-weighted decibel (dBA) increase was significantly associated with the transient effects of 1.39 (95% confidence interval: 1.07, 1.79) %mL/mmHg in arterial compliance at nighttime but -1.70 (-2.05, -1.10) kdynes·s/cm(5) in arterial resistance during the daytime and -2.38 (-3.44, -1.64) kdynes·s/cm(5) in arterial resistance at nighttime among all subjects. Such effects were observed in arterial distensibility only during the daytime after the 30-min (-1.84 [-2.61, -1.29] %/mmHg) and 60-min (-2.06 [-2.95, -1.44] %/mmHg) time-lagged noise exposures. For 24-h environmental noise, a 1-dBA increment was significantly associated with a sustained increase of 1.25 (1.10, 1.42) %mL/mmHg in arterial compliance but a decrease of 2.12 (-2.51, -1.80) kdynes·s/cm(5) in arterial resistance. Environmental noise exposure may have transient and sustained effects on adult vascular properties.