Justin played baseball with his, with his Docs OK, BUT his was in his abdomen under his ribs, not right on the surface. I think the concern is mainly about fracturing the leads, especially if you are completely dependent on it. He wore a small protector that coverred the area, he was a catcher, (which had me a little nervous). He also played soccer and basketball and skateboarded when he had it.
He wasn't on any meds at the time
I forgot to add, I do think you should ask Your doc tho.