Vocational Factors. Sedentary Job. All sedentary jobs require that a worker have the capacity to remain seated most of the day. Persons who must often interrupt their sitting with standing for significant periods of time are prevented from reliably attending to work in a seated position. However, where claimant need only interrupt his sitting with brief periods of standing in order to relieve pain and stiffness in his knee, the evidence is strong that he does "have the capacity to remain seated most of the day."