Fuente: David C Nieman, Dru A. Henson, Sarah J. Gross, David P. Jenkins, J. Mark Davis, E. Angela Murphy, Martin D. Carmichael, Charles L. Dumke, Alan C. Utter, Steven R. McAnulty, Lisa S. McAnulty, and Eugene P. Mayer. Official Journal of the American College of Sports Medicine, 2007, 1561-1569.