Okay, this is a little odd, but just go with me.
I often wear a pull-up or male guard to work, since I like the feeling but want something discreet. Anyone who's done this knows that you can't flood them, you have to just let things trickle slowly, releasing little bits of urine at a time.
What we're essentially doing here, by controlling the flow, is Kegel exercises, which strengthens the pelvic muscles and actually improves continence.
It's not often that true irony rears its head, but I can't imagine why it's not true that by using incontinence products I'm actually decreasing my odds of becoming incontinent.