Measuring the Concurrent Validity of the Upper Limb Use Ratio With Accelerometers in an Ecological Situation After Stroke.

Inclusion Criteria: * Subject with hemiparesis following stroke * Subject participating in ecological activities during occupational therapy sessions * Adult subject aged 18 or over * Subject informed of study participation and not objecting to participation Exclusion Criteria: * Other neurological or musculoskeletal disorders limiting use of upper limbs * Pregnant or breast-feeding woman, * Failure to obtain consent, * Non-affiliation with a social security scheme, * Persons under court protection, * Person protected by law (under guardianship or curatorship) * Participant in another research project with an exclusion period still ongoing.