Prior to getting my test results and doing some research on the connection between endurance exercise and endocrine system, I wasn't really aware that there was a connection. I had heard of the female athlete triad (you can read about Anna Frosty's experience here), but I wasn't aware of the more general connection between exercise and hormones in athletes of both sexes. I have been reluctant to write about this experience on the blog since it is impossible to analyze my experience and understand what caused the problem in the first place or understand which if any of the various changes I made in nutrition and exercise habits that hopefully has fixed it. However, it did seem possible that endurance exercise or excess amounts thereof was at the root of the problem and if that is the case it seems likely that other ultrarunners may experience similar problems so I thought it might be helpful to link to some of the information I found on this subject.
There are publications in the scientific literature documenting a connection between endurance exercise and hormone imbalances although I couldn't find anything very useful in terms of how frequently this happens or how much exercise might cause it. Some exercise and fitness web sites advocate weight training to improve anabolic hormone production and avoid the "negative catabolic (breakdown) effect of hard endurance training". Ben Greenfield says that "hormonal deficits are the biggest problem among endurance athletes" and he advocates weight training and increased fat consumption to stimulate anabolic hormone production while replacing or minimizing long endurance training sessions with shorter higher intensity workouts to minimize the negative effects of endurance training. Lucho has posted a nice article from UltraRunning Magazine on his blog that describes the importance of the endocrine system for endurance athletes, although it doesn't address any of the specific imbalances that appeared in my tests.
I have made a variety of changes in order to try to fix the endocrine problems. In addition to increasing calories, I began taking vitamin D and magnesium supplements. I added weight lifting and sprint sessions to my workout schedule last year. Now that I have completed the Coyote Two Moon 100 miler, I currently don't have any races on my calendar for 2012 and am starting to experiment further with my training. I have continued the weight training sessions and am again limiting weekly long runs to two hours. I am running with a heart rate monitor for the first time in years see if that will improve the quality of the running sessions. The good news so far is that after two years of mostly running on tired and sore legs, I now have a lot of days where my legs really have a lot of energy. The jury is still out on whether or how that translates into performance at an ultra.
Any other endurance athletes out there with similar experiences?
