Comment by alwaysrunning

As an ex-ultra runner I can attest to this, but they are usually awesome. However, I did notice that the more races/backyard races/years of training reduced the feelings of mind fog and wild hallucinations dramatically and recovery time decreased. This was the case with the group members I trained with as well. So, it would be interesting to know if the study included veterans or newcomers, or how many marathons the participants had under their belt.