Compared with placebo , isoproterenol decreased carotid-femoral PWV in white ( from 5.9 + / - 1.2 to 5.7 + / - 1.1 m/s , means + / - SD , P = 0.05 ) , but not in black subjects ( from 6.2 + / - 1.3 to 6.6 + / - 1.7 m/s , P = 0.1 ) .
