Randomization and masking
orthostatic exercise
Patients were randomly assigned (1:1) to 4 weeks of early orthostatic exercise (intervention group) or standard care (control group), using a web‐based computer‐generated block‐randomization procedure set up by the Copenhagen Trial Unit (Centre for Clinical Intervention Research, Rigshospitalet). Block sizes were randomly assigned as either four, six or eight patients. We stratified the randomization according to either low or high GCS (low 3–6; high 7–10). Due to the nature of the intervention (head‐up tilt), masking was not possible neither to the clinical staff nor the patients. All baseline assessments were performed prior to randomization.