I subscribe to the montly "Women's Cycling" newsletter and today it had this little gem:
If you are a lady, and use a heart rate monitor to gage your workouts, you might be working too hard!
I rely on testing to see what my maximum heart rate is but I can see now why I was justified in doing that -- the old forumla is WRONG!
Old forumla: 220 minus your age.
New forumla: 206 minus 88% of your age.
Using the new forumla, guess what! I got a number that actually makes a lot more sense compared to test results. So there ya go!
Original article printed in NYTimes