RT Journal Article SR Electronic T1 Improvement in volitional tests of muscle function alone may not be adequate evidence that inspiratory muscle training is effective JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 5 OP 6 DO 10.1183/09031936.03.00107403 VO 23 IS 1 A1 M.I. Polkey A1 J. Moxham YR 2004 UL http://erj.ersjournals.com/content/23/1/5.abstract AB