When I first got my heart rate monitor a few years back, I figured it would have been great at basketball practice. I would have used it to prove to coach that even though I was last during the sprints, I was working as hard as anyone else was.
I could have used eaither % max heart rate or % LT to show it. I knew someone was doing this somehwere.
Today it was confirmed.
http://www.newsnet5.com/news/3850505/detail.html
In fact polar has a whole section of their website for coaches and such.
And let me be the first to say, depending on what this guy is doing, there could be improper use. He could be basing it off of raw numbers or off of a formula derived max heart rate.