Banning School Recess - What does the research say?

Because Muscogee county schools have a recess twice a week policy, I will be posting various articles that discuss the lack of recess in elementary schools and it's affect on children and education. Here's the first one from FamilyEducation.com.
Banning School Recess - FamilyEducation.com

In the article it refers to a study done by Olga S. Jarret. Here is a link to that study:
http://www.ericdigests.org/2003-2/recess.html

At the end of the study by Olga Jarret, she cites various references and studies done that are extremely helpful in this discussion.