Sleep Deprivation and Endothelial Function.

BACKGROUND

Epidemiological studies have demonstrated an association between sleep deprivation (SD) and ischemic heart disease.

OBJECTIVES

To determine the effect of SD on the endothelial function and on the inflammatory profile of young healthy men following 24 hours of work without sleep.

METHODS

Fourteen healthy men (age 31.3 ± 2.4 years) participated in our prospective study. Endothelial function was evaluated by the brachial artery method, measuring flow medicated percent change (FMD%) of the brachial artery by a linear array ultrasound early in the morning. Interleukin 1 (IL-1) and interleukin 6 (IL-6) were measured in saliva by ELISA.

RESULTS

Basic FMD% was 6.7 ± 6.8%, and following SD 1.7 ± 3.3% (P = 0.009). A 5.0 ± 6.1% decrease was measured after SD. IL-1 levels increased after SD from 36 ± 21 pg/ml to 47 ± 24 pg/ml (P = 0.004), and IL-6 levels increased from 22 ± 07 pg/ml to 36 ± 11 pg/ml (P = 0.0005). A negative correlation was found between the change (decrease) in FMD% and the change (increase) in IL-1 level (r = -0.813; P = 0.001). A negative correlation was found between the decrease in FMD% and the increase in IL-6 level (r = -0.735; P = 0.003).

CONCLUSIONS

SD led to endothelial dysfunction with increase in markers of inflammation (IL-1 and IL-6), with an inverse correlation between the change (decrease) in endothelial function and the change (increase) in IL-1 and in IL-6.