Endogenous opioid peptide responses to opioid and anti-inflammatory medications following eccentric exercise-induced muscle damage

William J. Kraemer, Michael F. Joseph, Jeff S. Volek, Jay R. Hoffman, Nicholas A. Ratamess, Robert U. Newton, Maren S. Fragala, Duncan N. French, Martyn A. Rubin, Timothy P. Scheett, Michael R. McGuigan, Gwendolyn A. Thomas, Ana L. Gomez, Keijo Häkkinen, Carl M. Maresh