A 42-year-old man on ICU has been sedated with propofol for 7 days following neurosurgery. On assessment, he has symmetrical proximal and distal weakness (MRC grade 3/5 in all limbs), areflexia, and intact sensation. EMG/NCS shows fibrillation potentials and reduced motor unit recruitment. CK is mildly elevated at 800 U/L. What non-pharmacological intervention has the strongest evidence for preventing and treating ICU-acquired weakness?