Exercise and Immunity: Research on Colds in Post-Menopausal Women and Adults

Educational only — not medical advice.

Regular physical activity appears to support immune function and may help reduce the frequency of common colds. Two well-designed studies highlight this connection.

Exercise Reduces Colds in Post-Menopausal Women

Research published in the American Journal of Medicine (October 2006;119:937–942) followed 115 sedentary, overweight or obese post-menopausal women for one year. Participants were assigned to one of two groups:

  • Exercise group: 45 minutes of moderate activity, 5 days per week

  • Control group: 45 minutes of stretching

Every three months, subjects reported episodes of upper respiratory infections.

Findings:

  • Women who exercised regularly had fewer colds than the stretching group

  • The protective effect became stronger as the study continued

  • In the final three months, women in the control group were more than three times as likely to develop a cold compared to the exercise group

More Activity, Fewer Colds

Another study in Medicine & Science in Sports & Exercise (2002;34:1242–1248) followed 500 adults for one year, tracking how often they experienced colds and how frequently they engaged in moderate exercise (anything more strenuous than walking).

Key outcome:

  • The most active participants had 25% fewer colds per year compared to the least active individuals

Summary

While exercise is known for its cardiovascular and metabolic benefits, these findings suggest it may also strengthen the body’s natural defenses against common viral infections. Regular, moderate physical activity—performed consistently over time—appears to be particularly helpful.