Comparisons of cerebrovascular hemodynamics. 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. P values are results of analysis of covariance with age, sex, and body mass index as covariates and Bonferroni test. CCVR, cerebral-cortex vascular resistance; CVRi, cerebrovascular resistance index; Z1, cerebrovascular impedance modulus at the first harmonics.