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.
Correlations between cerebrovascular impedance modulus at the first heart rate harmonic (Z1) and cerebral blood flow velocity (CBFV) and cerebral cortical perfusion (CCP). YS, MS, and MA indicate young sedentary (10 men, 11 women), middle-aged sedentary (11 men, 10 women), and masters athletes (11 men, 10 women), respectively.
