Fig. 5.
Microvascular blood flow was measured by contrast-enhanced ultrasound (CEU). Microvascular blood volume (MBV; A), microvascular flow velocity (MFV; B), microvascular blood flow (MBF; C), and representative images captured during 10-s pulsing intervals (D) in healthy younger and older subjects during BASAL and SNP+AA at 60 min. Student's t-tests were conducted for descriptive purposes only after general linear mixed model revealed a significant effect of time for MBV (P < 0.005) and MBF (P < 0.01). *Significant difference from BASAL. Lines connecting related data are for descriptive purposes only and do not imply linear changes with time.