I have not seen the original article, but found this an intesresting read:
http://well.blogs.nytimes.com/2015/01/29/for-athletes-the-time-of-an-event-can-affect-performance/
Now if only we could choose session times
http://well.blogs.nytimes.com/2015/01/29/for-athletes-the-time-of-an-event-can-affect-performance/
Now if only we could choose session times