Primary ciliary dyskinesia is an autosomal recessive disorder characterized by abnormal ciliary movement and disrupted mucociliary clearance. In uncleaned airways, microorganisms and respiratory irritants cause inflammation and infection. Permanent rhinitis and chronic sputum cough are typical features in primary ciliary dyskinesia patients. Primary ciliary dyskinesia is a disease that threatens lung function from pre-school age. One of the main causes of respiratory muscle weakness in chronic lung diseases diseases is worsening of lung function. Such a weakness causes alveolar hypoventilation, microatelectasis, reduction of the cough strength .The cough strength is important for airway cleaning.

Exercise capacity is affected in chronic lung diseases. Assessment of exercise capacity in chronic lung diseases is prognostically important. Reduced exercise capacity and pulmonary function in PCD cause decrease in physical activity level. PCD patients have low quality of life and early recognition has been found to affect the quality of life positively. Children with chronic illness have higher level of depression than healthy children.

In literature, no study investigated respiratory muscle strength, exercise capacity and physical activity PCD patients. Therefore, the investigators aimed to compare aforementioned outcomes in PCD patients and healthy controls.

According to sample size calculation 26 diagnosed primary ciliary dyskinesia patients and 26 healthy individuals will be included. Respiratory muscle strength, anaerobic and aerobic exercise capacity, physical activity, pulmonary functions, peripheral muscle strength, cough strength, respiratory muscle endurance, activity dyspnea perception, quality of life and depression will be evaluated. Primary outcome measurements are respiratory muscle strength, exercise capacity, physical activity; secondary outcomes are pulmonary functions, peripheral muscle strength, cough strength, respiratory muscle endurance, activity dyspnea perception, quality of life and depression.

Inclusion Criteria:

• Diagnosed primary ciliary dyskinesia patients,
• 6-18 years of age,
• under standard medications,
• stable patients without exacerbation or infection

Exclusion Criteria:

• having cognitive disorder,
• orthopedic or neurological disease with a potential to affect functional capacity,
• acute infections or pneumonia,
• problems which may prevent evaluating such as visual problems

Out- patients and healthy volunteers

There is not a plan to make individual participant data but when the statistical analyses of all data are made, all results will be shared.