Multiple outlets report that a common belief is that high-intensity or long-duration exercise increases stress hormones such as cortisol. The articles say cortisol can rise during physical activity, particularly during harder or longer sessions, because it is involved in mobilising energy and supporting the body’s response to exercise. However, the sources explain that a temporary increase does not necessarily mean exercise is harmful or that it creates chronic stress.
The coverage highlights that cortisol responses vary by factors including exercise intensity, duration, an individual’s fitness level, and the timing of measurement. Experts quoted in the stories generally distinguish between short-term, exercise-related cortisol changes and sustained elevations that could be associated with stress or poor recovery. The articles also note that regular training can improve how the body responds to physiological stress, potentially leading to a more controlled hormone response over time.
Overall, the sources conclude that intense workouts may raise cortisol in the moment, but whether that translates into negative health effects depends on the broader pattern of training, recovery, and individual circumstances.
