Table 2.

Early rehabilitation exercise treatment program

Condition	Item
−1 ≤ RASS score ≤ 1 point, upper limb muscle strength is grade 2, and oxygenation index is 100 ~ 200 mmHg	Patients will receive grip strength training, active or assisted joint movement, active or assisted in-bed sitting training, and assisted in-bed pedal cycling. These exercises will be conducted twice daily, 10–20 min per session.
−1 ≤ RASS score ≤ 1 point, upper limb muscle strength ≥ grade 3, and oxygenation index > 200 mmHg	Patients will receive seated exercises, bedside sitting, and active in-bed pedal biking. These will be conducted twice daily, 10–20 min per session.
Conscious, upper and lower limb muscle strength ≥ grade 3 and oxygenation index > 200 mmHg	Patients will undergo bed-to-chair transfer training with the assistance of assistive devices and medical staff. This will be conducted twice daily, with training duration based on patient tolerance.
Conscious, upper and lower limb muscle strength ≥ grade 4 and oxygenation index > 200 mmHg	Patients will receive bedside standing training and walking practice with the assistance of walkers and medical staff. This will be conducted twice daily, with training duration based on patient tolerance.

RASS Richmond Agitation-Sedation Scale