The prevalence of lumbar degenerative discs (LDD) was determined in 38 ambulating and 21 sedentary employees of a Rocky Mountain company. Lumbar degenerative discs were identified by magnetic resonance imaging (MRI) performed with a sagittal T2 image of the lumbar spine using a .5 Tesla unit. The L5-S1 level was the most common disc with degenerative changes. Analysis of the two groups showed a significant association at the L5-S1 level between occupation and LDD, as evidenced by the ambulating females having no degenerative lumbar discs and sedentary females having a large number of degenerative discs. The males in the study did not demonstrate a significant difference in prevalence of LDD. Lumbar degenerative discs may be increased in less active females at the L5-S1 level.