If you have a lumbar subluxation that has been around a while and Degenerative disc disease is setting in, (don't panic its easily dealt with) impact sports or weight bearing sports can aggravate the thinning disc and associated soft tissue causing it to swell. this swelling puts pressure on the nerve that exits at that level, in and around the IVF Since only ten percent or so of the average nerve is sensory related you may not experience pain in your back and still have symptoms in your periphery. A hard day of turns may be aggravatinng an old injury that was dormant until now.
A good chiropractor will find it and adjust it relieving the pressure. he or she will also give you a program of care to restore the joint to proper working condition so you don't have the problem in the future. These episodes typically will increase in both occurrence and severity as the disc thins so ignoring the problem or covering it up with drugs will only put off the inevitable. Use ice on your low back after a hard day riding to help with the swelling and that will help short term.