Pilot Study on the Correlation Between Accelerations Experienced

Inclusion Criteria: * Male subject * Subject aged between 19 and 20 years * Subject willing to follow the study procedures * Subject capable of understanding the purpose, nature, and methodology of the study * Subject affiliated with a French social security scheme or a beneficiary of such a scheme * Subject who has signed the non-opposition to participation in the research * Subject who has signed the informed consent for salivary micro-RNA analysis * Subject selected in the French under-20 rugby team (U20). Exclusion Criteria: * Subject not affiliated with a French Social Security scheme or not a beneficiary of such a scheme * Subject deprived of liberty, protected adults, vulnerable persons, or minors * Subject with proven or suspected chronic infectious disease that may pose a risk of contamination during sample handling (laboratories not equipped to handle this type of sample) * Subject suffering from Gougerot-Sjögren syndrome (dry syndrome) * Refusal to sign the non-opposition * Refusal to sign the informed consent for salivary micro-RNA analysis. Specific Non-Inclusion Criteria: * Subject who has suffered a recent stroke or epileptic event (within the last two months) * Subject suffering from neurological diseases.