“……to investigate the potential intensity–dependent effects of an acute bout of exercise on conduit and resistance artery function in healthy older adults.”
“11 healthy older adults (five males/six females, 66 ± 1 years old) completed 30 minutes of recumbent cycling at 50%–55% (low intensity) and 75%–80% (high intensity) of their age-predicted HR max on two separate study visits.”

“Our data indicate that high-intensity exercise acutely enhances conduit artery function in healthy older adults. In addition, an acute bout of exercise enhances resistance artery function independent of intensity.”

E.IWAMOTO, et al
High-Intensity Exercise Enhances Conduit Artery Vascular Function in Older Adults
Medicine & Science in Sports & Exercise – Volume 50 #1 – January 2018 – page 124