One thing to note here is that hypertrophy and dilation of the ventricles is common in trained athletes. When the average cardiologist reviews the test results on a highly trained athlete's heart, they may be concerned because the degree of hypertrophy (increased thickness of the muscle wall) and dilation (thinning of the muscle wall resulting from expansion of the ventricle) is way off of the charts compared to the average person on the streets.
I went through this last year as a result of the testing done as part of my physical with my GP. The cardiologist I saw was sort of stumped and a little concerned. I ended up doing a treadmill stress test and the nurse administering the test knew me from the local endurance sports scene as he is a local triathlete. Fortunately, as someone who had a real interest in the cardiology of athletes, he knew that my tests would be off from the viewpoint of my cardiologist and he also knew that the Mayo clinic has a database on the hearts of elite athletes. When compared to the appropriate data set, it turned out my heart was just fine, despite slight hypertrophy of the LV and moderate dilation of the RV.
So, have the tests done, but if it turns out that your doc is concerned about the dilation or hypertrophy of your ventricles, suggest that they send the results to the Mayo clinic for comparison against their database (I thought this might be a big hassle to have done, but apparently it was no big deal. It just happened in the background for me).