I was watching an XC skiing event on TV today (I'm on vacation in Scandinavia, OK?) and when they showed a skier's name, country, age, place, time behind the leader, etc, the station would also show their heart rate! It was pretty cool watching the rates climb on hills or when someone attacked, etc, especially when they showed two people battling side-by-side or with the split screen.
Could this work in running?