Figure 5. Effect of ascorbic acid on forearm blood flow from rest to steady-state handgrip exercise.

When ascorbic acid was administered prior to the onset of exercise, forearm blood flow increased to similar levels within 1 min of exercise in young and older adults and this persisted throughout the exercise trial (A). In B, forearm blood flow at rest and after 5 min of steady-state exercise from Trial 1 (no ascorbic acid; control) and Trial 2 (concurrent ascorbic acid infusion) are shown. †P < 0.05 vs. without ascorbic acid within age group.