Figure 4. Brachial artery flow‐mediated dilatation (FMD) prior to, immediately post and 60 min following 30 min cycle exercise at 75%HR_max .

A, placebo condition (grey bars); B, prazosin condition (black bars). Error bars represent SEM. Statistical significance was assumed at P ≤ 0.05; *statistical significance from ‘Pre’ value. (NB: subjects were exercised at a target HR of 75%HR_max, resulting in mean workloads of 161 ± 16 W in the placebo condition and 140 ± 20 W in the prazosin condition.)