Reliability and Validity Study for SWE of Shoulder Muscles in Persons After Stroke.

Stroke group Inclusion: * Stroke patients in the subacute phase after stroke (\< 6 months post stroke) * Able to sit independently with support of the back, but without support of the arms * With upper-limb (UL) impairment: i.e. no maximum score (36) on the shoulder elbow part of the Fugl-Meyer UL (FM UL) Exclusion Criteria: * Other neurologic disorders * Shoulder or neck surgery before stroke onset * Arthroscopic surgery in the last year before stroke onset. * Shoulder or neck pain in the last year before stroke onset. * Severe cognitive or language deficits that inhibit the participants of understanding simple commands or providing valuable information regarding the outcome measures - measured with the Ability Q. * Participants who are not able to maintain the test position. * Pregnancy Healthy controls can participate if they * Have not suffered a stroke or other neurological disorders * Did not have surgery at the shoulder and/or neck * Did not have arthroscopic surgery in the last year before stroke * If they do not suffer any shoulder or neck pain