Hi,
as part of my previous job, I have written a guideline on mobilisations of medical/ surgical patients in an ICU (in the late 90s). Unfortunately, that guideline was written and saved at my work computer, and I haven't got it.
However, there was heaps of literature about it in Medline and CANAHL.
Have you tried a search "mobilisation", "intensive care", +/- "Nursing"/ "Physiotherapy"/ "Physical Therapy" ?
Early mobilisation has lots of proven benefits and it should be part of the nursing daily plan. Physio only has got the minor role of assistance with mobilisation in case of an actual problem with the mobilisation.
Good luck,
Fyzzio