You can use the arrow keys ( , ) to change the selection of edges to a full edge loop on a polygonal mesh. You can then quickly change or walk the edge loop selection along the mesh.
To select and then walk an edge loop selection across a mesh
You can select an edge loop using Select > Select Edge Loop Tool or by Ctrl + right-clicking on the desired edge and choosing the Select Edge Loop Tool from the Edge Loop Utilities marking menu item.
The following limitations exist for edge loop selection with arrow keys: