| 
         
        Intervertebrae 
        discs depend on changes in pressure to receive
        nutrients and remove waste products. 
        
        Postural fixity 
        
        1. results in reduced 
        nutritional exchanges and in the long term may promote degenerative 
        processes. 
        
        2. promotes static loading of the back and shoulder muscles, resulting 
        in aches and cramping. 
        3. causes restriction in blood flow to the legs, resulting in swelling 
        and discomfort. 
         
        How to Reduce Postural fixity? 
        1. Periodically stand up, flexing and bending the back and legs. 
        2. Design chair to allow the user to rock and assume a variety 
        of postures. 
        3. A tag that says 
        Caution: Prolonged sitting may be hazardous to your health 
         
¡@ 
        
            ¡@ 
         |