Healthy recreational and high level athletes will undergo 2 randomized, cross-over counterbalanced sessions of anodal tDCS or sham tDCS.

The primary outcome is an isokinetic evaluation of their hamstrings' and quadriceps' endurance after each session

Recruitment :

Healthy recreational and high level athletes will be recruited through social media and advertisements.

Each subject came twice to the Liege University Hospitals' isokinetic lab. Each session began with strapping the subjet into the isokinetic machine, making sure that all the settings were adapted to the subject. Then, each subject received either anodal tDCS, of sham tDCS. Neither the evaluator or the subject knew which they were receiving. Immediately following tDCS, there was a warmup consisting of stationary bike, and an isokinetic warmup. Then, subjects' endurance was using a maximal isokinetic tests, at 30 maximal concentric and eccentric contractions at a speed of 180°/s.

Inclusion Criteria:

• For the "recreational" group at most 3 hours of sport a week
• For the "athletic" group, at least 10 hours of sport a week
• Right handed and footed

Exclusion Criteria:

• One on the TSST (in high and relatively high risk sections)
• Previous neurological or orthopedic pathologies affecting limbs

The device is preprogrammed by a third party non participating in any element in the study. They then chose (using opaque envelopes) the treatment code for each participant