1. Rochester DF . Effects of COPD on the respiratory muscles. In Cherniack NS ed. Chronic obstructive pulmonary disease. Philadelphia: W.B. Saunders and Company , 1991: 134-157.
2.
2. Gosselink R , Troosters T , Decramer M . Peripheral muscle weakness contributes to exercise limitation in COPD . Am J Respir Crit Care Med1996; 153: 976-980 .
3.
3. Ries AL , Carlin BW , Carrieri-Kohlman V et al. Pulmonary rehabilitation: joint ACCP/ACCVPR evidence-based guidelines . Chest1997; 112: 1363-1396 .
4.
4. American Thoracic Society . Pulmonary rehabilitation . Am J Respir Crit Care Med1999; 159: 1666-1682 .
5.
5. Morgan MDL , Calverley PMA , Clark CJ et al. Pulmonary rehabilitation . Thorax2001; 56: 827-834 .
6.
6. Weiner P , Azgad Y , Ganam R . Inspiratory muscle training combined with general exercise reconditioning in patients with COPD . Chest1992; 102: 1351-1356 .
7.
7. Wanke T , Formanek D , Lahrmann D et al. Effects of combined inspiratory muscle and cycle ergometer training on exercise performance in patients with COPD . Eur Respir J1994; 7: 2205-2211 .
8.
8. Chen H , Dukes R , Martin BJ . Inspiratory muscle training in patients with chronic obstructive pulmonary disease . Am Rev Respir Dis1984; 131: 251-255 .
9.
9. Goldstein RS , De Rosie J , Long S , Dolmage T , Avendano MA . Applicability of a threshold device for inspiratory muscle testing and training in patients with COPD . Chest1989; 96: 564-571 .
10.
10. Dekhuijzen PNR , Folgering HTM , van Herwaarden CLA . Target-flow inspiratory muscle training during pulmonary rehabilitation in patients with COPD . Chest1991; 99: 128-133 .
11.
11. Berry JK , Adair NE , Sevensky KS , Quinby A , Lever HM . Inspiratory muscle training and whole-body reconditioning in chronic obstructive pulmonary disease . Am J Respir Crit Care Med1996; 153: 1812-1816 .
12.
12. Larsen JL , Covey MK , Wirtz SE et al. Cycle ergometer and inspiratory muscle training in chronic obstructive pulmonary disease . Am J Respir Crit Care Med1999; 160: 500-507 .
13.
13. Weiner P , Magadle R , Berar-Yanay N , Davidovich A , Weiner M . The cumulative effect of long-acting bronchodilators, exercise, and inspiratory muscle training on the perception of dyspnea in patients with advanced COPD . Chest2000; 118: 672-678 .
14.
14. Larsen JL , Covey MK , Vitalo CA , Alex CG , Patel M , Kim MJ . Maximal inspiratory pressure . Chest1993; 104: 448-453 .
15.
15. Sturdy GA , Hillman DR , Green DJ , Jenkins SC , Cecins NM , Eastwood PR . The effect of learning on ventilatory responses to inspiratory threshold loading in COPD . Respir Med2004; 98: 1-8 .
16.
16. Lotters F , van Tol B , Kwakkel G , Gosselink R . Effects of controlled inspiratory muscle training in patients with COPD: a meta-analysis . Eur Respir J2002; 20: 570-578 .
17.
17. Gorini M , Misuri G , Corrado A et al. Breathing pattern and carbon dioxide retention in severe chronic obstructive pulmonary disease . Thorax1996; 51: 677-683 .
18.
18. Shoup R , Dalsky G , Wamer S et al. Body composition and health related quality of life in patients with obstructive airways disease . Eur Respir J1997; 10: 1576-1580 .
19.
19. Borg G . Psychophysical bases of perceived exertion . Med Sc Sports and Exerc1982; 14: 377-381 .
20.
20. Guyatt GH , Berman LB , Townsend M , Pugsley SO , Chambers LW . A measure of quality of life for clinical trials in chronic lung disease . Thorax1987; 42: 773-778 .
21.
21. Derogatis LR , Cleary PA . Confirmation of the dimensional structure of the SCL-90: a study in construct validation . J Clin Psychol1977; 33: 981-989 . Chronic Respiratory Disease