Myths vs facts: Cortisol senken and Sport

Cortisol is a vital hormone regulating metabolism, blood sugar, and stress response. A common myth is that exercise always lowers cortisol. In reality, the effect depends on intensity and duration: moderate endurance activity (e.g., jogging, cycling) can train the stress axis over time, potentially lowering resting cortisol. High-intensity exercise (HIIT, heavy weightlifting) or prolonged sessions (marathon) acutely raise cortisol – a normal adaptive response, not a sign of overtraining. Another myth is that cortisol is inherently harmful. In fact, it is essential for energy mobilization and immune function. Problems arise only when levels remain chronically elevated due to ongoing stress, poor sleep, or overtraining. Exercise can help, but only with proper balance: recovery, sleep, and nutrition are key. To lower cortisol, focus on consistent moderate activity and adequate rest, not extreme measures. The evidence is mixed: solid physiological studies exist, but no universal recommendation applies to everyone. Individualized testing (saliva, blood) can reveal personal patterns but should not be used in isolation for diagnosis.