Objectives: The aim of our study was to investigate the effects of home-based deep breathing exercises (DBEs) on pulmonary functions and fatigue in patients with mild and moderate stages of Parkinson's disease (PD). Method: This study included 24 patients diagnosed with idiopathic PD in the Neurology Department at Dokuz Eylul University Hospital. The subjects were assigned to 15 repetitive DBEs 3 times a day for 12 weeks. The patients' pulmonary function test results and fatigues were evaluated before and after a 12-week DBE program. Results: After a 12-week BDE program, an increase was determined in the forced expiratory volume in 1 second (FEV1), forced vital capacity (FVC), peak expiratory flow (PEF) and maximum voluntary ventilation (MVV) (p<0.05). There was a decrease in the patients' fatigue levels after the breathing exercises (p<0.05). Discussion: Home-based DBEs improved pulmonary function test results and fatigue in patients with mild to moderate PD. Therefore, we consider that DBEs which can be easily performed in any environment and do not require any equipment should be recommended to all patients with PD to improve respiratory functions and fatigue. Archives of Neuropsychiitry 2012;49:59-62) Key words: Parkinson's disease, pulmonary function test, deep breathing exercise, fatigue Amac: Bizim calismamizin amaci, hafif ve orta evredeki Parkinson hastalarinda evde yapilan solunum egzersizlerinin pulmoner fonksiyonlar ve yorgunluk uzerindeki etkilerini arastirmaktir. Yontemler: Bu calismaya Dokuz Eylul Universite Hastanesi Noroloji Bolumunde idyopatik Parkinson hastaligi tanisi konan 24 hasta alinmistir. Hastalar derin solunum egzersizlerini gunde 3 defa 12 hafta suresince 15 tekrarli olarak uygulamislardir. Hastalarin pulmoner fonksiyon test sonuclari ve yorgunluk duzeyleri 12 haftalik derin solunum egzersiz programi oncesi ve sonrasi degerlendirilmistir. Bulgular: 1. saniye zorlu expiratuvarvolum (FEV1), zorlu vital kapasite (FVC), pik ekspiratuvar akis (PEF) ve maksimum istemli ventilasyon degerlerinde 12 haftalik derin solunum egzersiz programi sonrasi artis oldugu belirlenmistir (MVV) (p<0,05). Derin solunum egzersiz programi sonrasi hastalarin yorgunluk duzeyi azalmistir (p<0,05). Sonuc: Hafifve orta evredeki Parkinson hastalarinda evde yapilan solunum egzersizleri pulmoner fonksiyon test sonuclarini ve yorgunluk duzeylerini iyilestirmistir. Bu nedenle biz, alet gerektirmeyen ve herhangi bir ortamda kolay bir sekilde uygulanabilen derin solunum egzersizlerinin solunum fonksiyonlarinin ve yorgunlugun iyilestirilmesi icin tum Parkinson hastalarina onerilmesi gerektigini dusunmekteyiz. Noropsikiyitri Arsivi 2012;49:59-62) Anahtar kelimeler: Parkinson hastaligi, pulmoner fonksiyon testleri, derin solunum egzersizleri, yorgunluk