The goal of this clinical trial is to learn if transcutaneous electrical nerve stimulation can affect blood flow in healthy volunteers. The main question it aims to answer is:

Determine the stimulation parameters (frequency in the range 5- 100Hz and proximal or distal placement) inducing the most significant hyperaemic response in volunteers.

Participants will attend to one visit ( 1h30) , 6 protocol of stimulation will be tested on his arm . If his agree, an optionnal measure will be made during another visit. During this optionnal visit, two modalities of intensity adjustment will be tested in regard of the result of the first part of the study.

Inclusion Criteria:

• Subject aged 18 years or older
• Having freely given written consent, after being informed of the purpose of the study, its conduct and its risks.
• Affiliated with a social security scheme

Exclusion Criteria:

• Persons with pacemakers or any other implantable electrical devices,
• Pregnant women
• Suffering from dermatological conditions or muscle/skin lesions on the arms and forearms.
• Participant unable to give free and informed consent.
• Participant unable to comply with the specific procedures of the study.
• Participant deprived of liberty or benefiting from legal protection measures.

exploratory research at this time