Early Remote Rehabilitation to Improve Health of the Elderly After Cardiac Surgery. (RECARD Trial)

"Six-week home-based rehabilitation program using the ICURA app and sensor-based technology (ICURA ApS, Copenhagen, Denmark). During the hospital stay patients in the intervention group are introduced to the app's usage, and an individualized training plan is collaboratively created and subsequently tailored by a physiotherapist.~The comprehensive mobile health intervention includes customized training programs, activity tracking, visualization of exercises with videos, and a password-protected webpage for physiotherapists to customize training programs and track patient activity.~The patients will receive two calls from a physiotherapist per week for the first two weeks and as required the following four weeks."