Fig. 2.

Absolute (A) and relative (B) compensatory vasodilator responses [change in forearm vascular conductance (FVC) compared with respective normoxic exercise condition] to hypoxic exercise before and after consumption of BR. The compensatory vasodilator response to hypoxic exercise was substantially attenuated in older compared with young adults under control conditions (pre-BR consumption). Acute dietary nitrate (via BR) enhanced the compensatory vasodilator response to hypoxic exercise in older, but not young adults. *P < 0.001 vs. young; †P < 0.01 vs. control (pre-BR consumption).