Interstitial lung disease includes a heterogeneous group of chronic lung conditions that is characterized by exertional dyspnoea and poor health related quality of life . includes idiopathic pulmonary fibrosis of unknown cause And another groups are caused by occupational, inorganic or organic exposure, drug- induced toxicities, or are secondaries to connective tissue disease The clinical course and outcome of interstitial lung diseases are highly variable between different sub types, but survival after diagnosis of idiopathic pulmonary fibrosis is only 2.5 to 5 years is a progressive and fibrosing lung disease that is characterized by architectural distortion of the lung parenchyma and is progressive, with a dismal prognosis Also patient with idiopathic pulmonary fibrosis generally demonstrate greater abnormalities of exercise induced gas exchange than those with other forms of Interstitial lung disease

Interstitial lung disease includes a heterogeneous group of chronic lung conditions that is characterized by exertional dyspnoea and poor health related quality of life . includes idiopathic pulmonary fibrosis of unknown cause And another groups are caused by occupational, inorganic or organic exposure, drug- induced toxicities, or are secondaries to connective tissue disease The clinical course and outcome of interstitial lung diseases are highly variable between different sub types, but survival after diagnosis of idiopathic pulmonary fibrosis is only 2.5 to 5 years is a progressive and fibrosing lung disease that is characterized by architectural distortion of the lung parenchyma and is progressive, with a dismal prognosis Also patient with idiopathic pulmonary fibrosis generally demonstrate greater abnormalities of exercise induced gas exchange than those with other forms of Interstitial lung disease People with exhibit limitation in peak exercise capacity, which is associated with impaired ventilation, gas exchange and pulmonary perfusion abnormalities Also in people with interstitial lung diseases there is a relationship between quadriceps muscle weakness and exercise capacity raising the importance of skeletal muscle dysfunction. Furthermore, since interstitial lung diseases is the leading diagnosis referred for lung transplant characterizing skeletal muscle dysfunction and its relationship to exercise capacity prior to lung transplant is of specific interest for this population.

The cause of muscle dysfunction in individuals with lung disease is multifactorial, including factors such as disuse, hypoxaemia, malnutrition, oxidative stress, systemic inflammation and medication Pulmonary inflammation and oxidative stress are thought to be pivotal in the pathogenesis of idiopathic interstitial pneumonia

Inclusion Criteria:

• All patient who will be presented to assuit chest department and diagnosed as IPF.

Exclusion Criteria:

• 1-IPF patient with malignant tumors. 2-Comorbid end stage renal, cardiac or hepatic patient. 3-patient who refused to participate in the study