When I did my project the title went through major whittling down processes as my research went on the title for my essay became more apparent, so if I was i your shoes, I'd just slap down any title that involves nanotech in sports and do a bit more research till you find the question that really fits your goals.
It may help to include a to what extent in the title, e.g "To what extent is the use of nanotechnology unethical in sport" (a bit vague perhaos but you get the idea), it allows you to get some investigation and opinion in there as well as just being a simpe statement.
If anything its more to write about in your production log