Conclusion
depression, depressive symptoms
The HIIT program in pregnancy, compared to the standard program of moderate-intensity physical activity, affects the production of cortisol in a different way. In the HIIT group we observed the increase in the hair cortisol levels, and in the EDU group there was a substantial decrease of this hormone. Nevertheless, the increase in cortisol in the HIIT group was not related with negative outcomes. We found no associations between hair cortisol levels and the severity of depressive symptoms, psychophysical well-being or fear of childbirth. Therefore, in the light of our research, the use of cortisol levels in pregnancy as a marker of negative stress, including the risk of depression, seems to be unjustified. The HIIT programs should be promoted in pregnant women as safe, beneficial and healthy.