I suffer from suffer from both bowel and Urin incontinence. The long term history is less important for this comment. The intensity increased with PD. The problem became accute in January after my Protatectomy. With the post-op rehab came a method to better deal with the symptoms.
The exercises used to train the pelvic muscles to help control Urin flow also restrict bowel movement. It doesn't cure the problem, but can make the difference in getting there in time or cleaning up the ugly mess. Doing the exercises daily doesn't take a lot of time. The freedom of movement is wonderful.