An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Mendez-Villanueva A, Buchheit M, Kuitunen S, Douglas A, Peltola E, Bourdon P.Mendez-Villanueva A, et al.J Sports Sci. 2011 Mar;29(5):477-84. doi: 10.1080/02640414.2010.536248.J Sports Sci. 2011.PMID: 21225488