Hughes Adrienne R, Gillies Fiona, Kirk Alison F, Mutrie Nanette, Hillis William S, MacIntyre Paul D
Center for Exercise Science and Medicine, University of Glagow, Scotland.
J Cardiopulm Rehabil. 2002 Nov-Dec;22(6):421-5. doi: 10.1097/00008483-200211000-00007.