Source: Annual Congress 2010 - Exercise training: new groups, new methods and outcomes
Disease area: Airway diseases

Abstract

Aim: Sleep disturbances are common in patients with chronic obstructive pulmonary disease (COPD). The aim of this study was to assess the impact of sleep quality on functional capacity, peripheral muscle strength, and quality of life in COPD patients.
Methods: Forty patients (61.6±8.3 years, FEV₁:51.4±21.2%) with COPD participated in this study. Subjective sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI) consisting of seven domains. Quadriceps muscle strength was measured and six-minute walk test (6MWT) was performed. Heart rate, oxygen saturation, dyspnea and fatigue perception using Borg Scale was recorded before and after the 6MWT. Quality of life was assessed using Notthingham Health Profile (NHP).
Results: Poor quality of sleep (PSQI total score>5) is found in 23 (57%) patients. Quadriceps muscle strength was significantly correlated with PSQI sleep duration (r=-0.34), PSQI sleep latency (r=-0.39), PSQI total score (r=-0.42, p<0.05). The 6MWT distance was significantly related with PSQI sleep latency (r=-0.34, p<0.05). Dyspnea perception during exercise was significantly correlated with PSQI daytime dysfunction (r=0.38), PSQI overall sleep quality (r=0.33), and PSQI total score (r=0.37, p<0.05). Fatigue perception during exercise was significantly related with PSQI daytime dysfunction (r=0.37) and PSQI total score (r=0.33, p<0.05). The NHP total score was significantly related to PSQI sleep duration (r=0.34), PSQI overall sleep quality (r=0.35), and PSQI total score (r=0.41, p<0.05).
Conclusion: In COPD patients, sleep quality related with functional capacity, peripheral muscle strength, and general quality of life. The effects of exercise training on sleep quality should be investigated in COPD.

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N. Vardar-Yagli, M. Saglam, S. Savci, H. Arikan, D. Inal-Ince, E. Calik, L. Coplu (Ankara, Turkey). Sleep quality in chronic obstructive pulmonary disease. Eur Respir J 2010; 36: Suppl. 54, 4880

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