Conduct a title search of the journal that contains the article you want. For example, you've found the article "Physiological responses to body weight-supported treadmill exercise in healthy adults" in the journal Archives of Physical Medicine and Rehabilitation, 2011, June; 92(6): 960-966.
From the Main Library's homepage (http://www.lib.msu.edu), click on 'Library Catalog', type in the title of the journal in this case Archives of Physical Medicine and Rehabilitation. Click on the down arrow next to 'Keyword', choose 'Journal/Periodical Title', click the 'Search' button.
If MSU has access to the title, there should be links to the paper and/or online version of the journal. MSU has this title in print from 1953 to 2002, and electronically from 1995-Present so the article "Physiological responses to body weight-supported treadmill exercise in healthy adults" is available only electronically from the MSU Libraries.