23,000-Person Study Examines Exercise and Depression Risk

Researchers studied more than 23,000 adults to see how movement and inherited susceptibility related to depression. Participants were about 56 years old on average, and roughly two-thirds were women. Genetic tests estimated predisposition, while wearables recorded daily step counts and time spent in moderate-to-vigorous activity. Researchers also considered depression diagnoses and the intensity of participants’ symptoms.

Greater inherited risk was associated with a higher likelihood of developing depression. People who were more active were less likely to have a diagnosis, but physical activity did not appear to alter the connection between genetic risk and whether depression developed. Symptom severity showed another pattern: within the higher-risk group, greater activity was associated with milder symptoms. This relationship appeared with multiple ways of measuring both movement and symptoms.

The study observed participants’ existing behavior rather than assigning them an exercise program, so it could not establish that activity reduced symptoms. Milder symptoms may have made movement easier, and other influences could have affected both. The findings nevertheless connect ordinary movement—not just athletic training—with depression symptoms among adults carrying greater genetic susceptibility. They also fit a broader picture in which biology, experiences, sleep, stress and social support all contribute to mental health.