Pilot Study on the Correlation Between Accelerations Experienced

Who May Qualify: - 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 willing to sign a consent form for salivary micro-RNA analysis - Subject selected in the French under-20 rugby team (U20). Who Should NOT Join This Trial: - 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 willing to sign a consent form for salivary micro-RNA analysis. Specific Non-Who May Qualify: - Subject who has suffered a recent stroke or epileptic event (within the last two months) - Subject suffering from neurological diseases. Always talk to your doctor about whether this trial is right for you.