Inclusion Criteria:  male age limits: minimum: 16 ; maximum: 40 years old to be a soccer player, licensed to the French Football Federation affiliation to the social health insurance scheme signing an informed consent form  Exclusion Criteria:  impossibility to give the subject enlightened information (subject in emergency situation, difficulties in understanding the study, …) subject under the protection of justice subject under guardianship or curatorship lower limbs musculotendinous or articular problems smoker or having been a smoker in the last 5 years subject wearing a pacemaker drug treatment in progress and impossibility to stop it within 7 days before the beginning of the study.