Effect of Vibratory Tendon Stimulation on Muscle Fatigue in the Acute Post-stroke Phase

Grip strenght measurement will always be done in the same way : for each series, 3 measurements of maximum strength will be taken for each side. Participants will receive verbal encouragement. After initial both sides grip strength evaluation, all participant will first experiment the vibration situation using the device Vibramoov Physio (TechnoConcept, Manosque, France): the vibrations had a frequency of 100Hz, with an amplitude of 2mm, they will be applied to the anterior part of the forearm for 10 minutes, 3 times. At the end of each 10 minutes vibration session, handgrip strength will be assessed. * Participants then have a one-hour rest period. * Control situation: participants will have 4 series of grip strength measurements every 10 minutes. At the end of the 2 hours, the patient will be discharged from the study protocol.