Changes in serum concentrations of 3,3’,5’-Triiodothyronine and 3,5,3’-Triiodothyronine during prolonged moderate exercise. - O’Connell,M.; Robbins,D.C.; Horton,E.S.; Sims,E.A.; Danforth,E Jr. (J Clin Endocrinol, 1979)