Last night before I taught RPM, my training partner had been for a run and brought up an article she had sent to me a few months back. This prompted me to re-read it. Have a look it is quiet interesting.
How Your Menstrual Cycle Affects Performance
With all the changes in hormone levels that occur during your menstrual cycle, you'd expect speed workouts to suffer during your period, right? Wrong. Surprisingly, near the end of your period, your body is actually geared to pegging track workouts and tempo runs. However, your long, slow runs will suffer. Read on to learn how your training and racing is affected by your menstrual cycle. Read it here: http://www.runtheplanet.com/trainingracing/training/women/menstruation.asp