1.Prevent and treat upright hypotension 2.Improve cardiopulmonary function and prevent the formation of crashing pneumonia 3.Improve circulation and prevent the formation of deep vein thrombosis in the lower limbs 4.Prevent osteoporosis 5.Prevent muscle atrophy 6.Prevent contracture of the joints of the lower limbs and improve the deformity of the joints of the lower limbs 7.Enhance proprioceptive inputs 8.Improve mood and prevent the incidence of anxiety and depression 9.Decrease the incidence of urinary infections and stones 10.Increase gastric and intestinal peristalsis and improve appetite, and reduce the incidence of constipation 11.Decrease the incidence of pressure ulcers