title: Effect of long-term treatment with corticosteroids on skeletal muscle strength, functional exercise capacity and health status in patients with interstitial lung disease.
abstract: Corticosteroids are occasionally used in the treatment of ILD. Chronic corticosteroid administration induces skeletal muscle weakness. However, it is unclear whether chronic corticosteroid treatment could further reduce skeletal muscle strength in patients with ILD who are weaker than healthy controls. The aim of this study was to determine the effects of chronic corticosteroid administration on skeletal muscle strength, exercise capacity, activities of daily living (ADL) and health status in ILD patients.
  
  
  
  Forty-seven ILD patients treated with corticosteroids and 51 Medical Research Council dyspnea grade-matched ILD patients not treated with corticosteroids were assessed by isometric quadriceps muscle force (QF) and handgrip force (HF), pulmonary function, 6-min walk distance, ADL score and health status (Medical Outcomes Study 36-Item Short-Form Health Survey), and the two groups' results were compared.
  
  
  
  QF and HF were significantly lower in subjects on corticosteroids than in the control patients (QF, 52.6 ± 25.6 vs 77.1 ± 33.3 %predicted, P < 0.001; HF, 63.8 ± 22.4 vs 81.8 ± 28.3 %predicted, P < 0.001, respectively). There were no significant differences in the 6MWD, ADL score and all subscales of the SF-36 between the groups. Inverse correlations were found between skeletal muscle strength and total amount of corticosteroids administered (QF, r = -0.401, P = 0.005; HF, r = -0.403, P = 0.005). On multiple regression analysis, the total amount of corticosteroids was an independent predictor of HF.
  
  
  
  Chronic cor3ticosteroid treatment contributes to muscle weakness in ILD patients, and muscle weakness is inversely correlated to the total amount of corticosteroids administered.
authors.affiliation: Cardiorespiratory Division, Department of Rehabilitation Medicine, Nagasaki University Hospital, Nagasaki, Japan.|Department of Infectious Diseases Unit of Molecular Microbiology and Immunology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Hanada
authors.affiliation: Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
authors.forename: Noriho
authors.initials: N
authors.lastname: Sakamoto
authors.affiliation: Department of Cardiopulmonary Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ishimatsu
authors.affiliation: Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kakugawa
authors.affiliation: Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Obase
authors.affiliation: Department of Cardiopulmonary Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Kozu
authors.affiliation: Department of Cardiopulmonary Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Senjyu
authors.affiliation: Department of Infectious Diseases Unit of Molecular Microbiology and Immunology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Izumikawa
authors.affiliation: Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.|Department of Respiratory Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mukae
authors.affiliation: Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kohno
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D003430:Cross-Sectional Studies; D004417:Dyspnea / Q000175:diagnosis / Q000209:etiology; D005080:Exercise Test / Q000379:methods; D017079:Exercise Tolerance / Q000187:drug effects*; D005260:Female; D005938:Glucocorticoids / Q000008:administration & dosage / Q000009:adverse effects; D054624:Health Status Disparities; D006801:Humans; D007564:Japan; D000069451:Long Term Adverse Effects / Q000139:chemically induced / Q000175:diagnosis; D017563:Lung Diseases, Interstitial / Q000188:drug therapy / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000187:drug effects*; D018908:Muscle Weakness / Q000175:diagnosis / Q000209:etiology; D018482:Muscle, Skeletal / Q000503:physiopathology; D052097:Quadriceps Muscle / Q000503:physiopathology
chemical_list: D005938:Glucocorticoids
keywords: idiopathic pulmonary fibrosis; interstitial lung disease; peripheral muscle strength; side effect; steroid