title: Impact of sleep quality on functional capacity, peripheral muscle strength and quality of life in patients with chronic obstructive pulmonary disease.
abstract: OBJECTIVE
  The purpose of this study was to assess the impact of quality of sleep on functional capacity, peripheral muscle strength and quality of life in patients with chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  Forty patients with COPD (61.6 ± 8.28 years) were included in this study. Subjective sleep quality (Pittsburgh sleep quality index), quality of life (Nottingham health profile), quadriceps muscle strength (QMS) and functional capacity (6-min walk test) were assessed.
  
  
  RESULTS
  Poor sleep quality (Pittsburgh sleep quality index total >5) was present in 57% of the patients. Patients with a poor sleep quality had significantly lower QMS and higher exercise heart rate (p < 0.05). The Pittsburgh sleep quality index total score was associated with QMS, Nottingham health profile physical mobility and sleep scores, exercise fatigue and dyspnea (p < 0.05).
  
  
  CONCLUSIONS
  Sleep quality is affected in a majority of patients with COPD. It is related with symptoms, functional capacity, peripheral muscle strength and general quality of life.
authors: Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
authors: Naciye
authors: N
authors: Vardar-Yagli
authors: Melda
authors: M
authors: Saglam
authors: Sema
authors: S
authors: Savci
authors: Deniz
authors: D
authors: Inal-Ince
authors: Ebru
authors: E
authors: Calik-Kutukcu
authors: Hulya
authors: H
authors: Arikan
authors: Lutfi
authors: L
authors: Coplu
mesh_terms: D000328:Adult; D000368:Aged; D005080:Exercise Test; D017079:Exercise Tolerance; D005260:Female; D006304:Health Status; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D052097:Quadriceps Muscle / Q000503:physiopathology*; D011788:Quality of Life; D012890:Sleep; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D011795:Surveys and Questionnaires; D016138:Walking
keywords: chronic obstructive pulmonary disease; muscle strength; quality of life; sleep