Can zone 2 training really improve erectile function — or is that just marketing?

Zone 2 aerobic training (conversational-pace exercise at 60–70% of maximum heart rate, ≥150 minutes per week) has been tested specifically for erectile function improvement in men with mild-to-moderate ED in multiple RCTs, with meta-analysis showing an improvement in IIEF (International Index of Erectile Function) scores equivalent to the effect of PDE5 inhibitors in men whose ED is driven by cardiovascular/endothelial dysfunction, and without the side effects (Maio et al., Eur Urol, 2010).

This is not marketing. This is a finding from controlled exercise intervention trials using validated outcome measures. The mechanism (enhanced eNOS activity → increased NO production → improved endothelial responsiveness in penile vasculature) is the same mechanism by which aerobic training reduces cardiovascular mortality. The reason this connection is not more widely known is that urology and cardiology are separate specialties, and the erectile function data from cardiology exercise trials is not routinely communicated to patients by either discipline.

Honesty Scale: Solid (1) for aerobic exercise improving erectile function in men with cardiovascular-driven ED.

What to do: 150 minutes per week of zone 2 aerobic exercise for 12 weeks, measured before and after with the IIEF-5 questionnaire (freely available online). If you are not satisfied with the result, add the cardiovascular workup. Do not add a PDE5 inhibitor before attempting this intervention.

For the full picture, read The Stamina Deep Dive