Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Influence of PM2.5 on the variation of blood pressure and heart rate. ECG was measured at 24h after the last dripping. A, blood pressure; B, heart rate; C, SDNN; The data are presented as mean ± SD (n=7); * P <0.05 indicating statistically significant difference; ** P <0.01 indicating very significant difference.
