Stroke patients will be assessed on 2 days with an interval of 3 days (Friday - Monday).~Day 1 (Friday): shear wave velocity (SWV) will be assessed by 2 assessors in randomised order. Each assessor will evaluate SWV of 6 shoulder muscles (m. supraspinatus, m. infraspinatus, m. rhomboid major, m. deltoideus, m. pectoralis major, m. pectoralis minor).~At the end of the assessment secondary outcome measures will be assessed.~Day 2 (Monday): SWV will be reassessed by assessor 1 to measure test-retest reliability.~Position of the patient will be changed. SWV of the pectoralis major and minor muscle will be reassessed.~Assessor 2 will perform a transversal stretch of the m. pectoralis major or a passive mobilisation of the hand at the hemiplegic arm of the stroke patients. Assessor 1 will reassess the SWV of the pectoralis major and minor muscle to assess if there is an immediate effect of the intervention. Assessor 1 will be blinded for the intervention.~Healthy controls (matched for age, gender and BMI):~Only one test day to assess SWV of 6 shoulder muscles. Secondary outcome measures will be assessed after SWE assessment.
This study aims~To examine the reliability of SWE assessment in the shoulder muscles of persons after a stroke.~To assess if differentiation can be made between the hemiplegic (HP) and non-hemiplegic (NHP) side and between stroke patients and matched healthy volunteers (discriminative validity).~To assess if an immediate effect on the pectoralis major and minor can be measured after applying transversal stretch technique to the pectoralis major muscles (response validity).