• A year-long clinical trial published in March 2026 found that 150 minutes of weekly aerobic exercise significantly reduced long-term cortisol levels in midlife adults

• The study, conducted by University of Pittsburgh and AdventHealth Research Institute, tracked 130 adults aged 26-58 over 12 months

• Chronically elevated cortisol is linked to heart disease, metabolic dysfunction, impaired memory and accelerated brain aging

• Exercise, adaptogenic herbs like ashwagandha, magnesium supplementation and sleep hygiene are evidence-backed cortisol reduction strategies

• Western medicine often treats downstream effects of high cortisol rather than addressing the hormonal root cause

The Discovery: What the Year-Long Trial Found

A randomized clinical trial published in the March 2026 issue of the Journal of Sport and Health Science has delivered the strongest evidence to date that regular aerobic exercise fundamentally alters the body's stress hormone biology. Researchers from the University of Pittsburgh and AdventHealth Research Institute recruited 130 adults aged 26 to 58, with 67.7% female participants, and tracked them for 12 months. Half the group engaged in 150 minutes of moderate-to-vigorous aerobic activity weekly; the other half received general health information but made no lifestyle changes. The result: the exercise group showed a significant reduction in long-term cortisol levels, measured through hair samples, compared to the control group.