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Based on contributions from neuroscience, which suggest that it is possible to consider cortisol hyperreactivity as a biomarker for the treatment and intervention of a population with post-traumatic stress disorder who suffered early adversity, a research is presented on nine children receiving psychomotor care. Cortisol levels were measured before and after receiving the intervention for four weeks, using a competitive enzyme-linked immunosorbent assay (ELISA) method for the determination of free cortisol in urine. The results of the study show that Relational Psychomotricity can be offered as an effective intervention methodology to reduce the stress that come along with this population in their daily lives. Cortisol levels decreased in all sessions, with a high level of significance obtained in the Wilcoxon analysis when comparing cortisol levels before the first session and after finishing the fourth one. In addition, a great variability is reported between the cortisol levels of each of the subjects, with the total values being higher in the male gender.
