Post Intensive Care Accelerometery to Study and Support Recovery Outcomes

The primary purpose of this study is to find out whether a wrist-worn activity monitor can help healthcare professionals understand how people recover after they leave the intensive care unit (ICU), where they were cared for when they were most unwell. By tracking recovery at home, the device may help identify problems early so that the right support can be provided. The study involves adults who are discharged from the ICU in three hospitals in Edinburgh. The main questions it aims to answer are: * Can movement data from a wearable device give useful information about how people feel and function after they return home following ICU and then hospital discharge? * Do changes in activity levels relate to changes in symptoms like pain, anxiety or behavioural measures like daily functioning, sleep and cognition? There is no comparison group in this study. Participants will: * Wear a wrist-worn activity monitor * Answer a short set of health-related questionnaires