Original research is considered a primary source.
An article is considered original research if...
EBSCOhost databases, such as SPORTDiscus and Academic Search Premier, include many original research articles. Type your topic into the first one or two search boxes and then use another box to type: "methods OR results" as shown here in the third box. Use the drop down menu to choose the ABSTRACT search field for the third box.
Also, be sure to utilize the peer reviewed limit. On the main search page, you'll find this in the "Search Options" box (beneath the search boxes).