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Respirology. 2016 Aug;21(6):1088-93. doi: 10.1111/resp.12807. Epub 2016 May 13.

Effect of long-term treatment with corticosteroids on skeletal muscle strength, functional exercise capacity and health status in patients with interstitial lung disease.

Author information

1
Cardiorespiratory Division, Department of Rehabilitation Medicine, Nagasaki University Hospital, Nagasaki, Japan.
2
Department of Infectious Diseases Unit of Molecular Microbiology and Immunology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
3
Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
4
Department of Cardiopulmonary Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
5
Department of Respiratory Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.

Abstract

BACKGROUND AND OBJECTIVE:

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.

METHODS:

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.

RESULTS:

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.

CONCLUSION:

Chronic cor3ticosteroid treatment contributes to muscle weakness in ILD patients, and muscle weakness is inversely correlated to the total amount of corticosteroids administered.

KEYWORDS:

idiopathic pulmonary fibrosis; interstitial lung disease; peripheral muscle strength; side effect; steroid

PMID:
27173103
DOI:
10.1111/resp.12807
[Indexed for MEDLINE]
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