I have not had PD long enough to know for sure but I have developed a hypothesis that running for over 45 minutes diminishes the symptoms of Parkinson’s Disease. For example, when I go running on Saturday mornings for at least an hour I can come home and do a number of chores such as yard work and heavy lifting without any noticeable PD symptoms. On the other hand, if I don’t run and do heavy yard work, I will notice symptoms the rest of the day.
FYI, I started training for marathons in 2010 and was diagnosed with PD in 2011.