Pulmonary function tests, aerobic capacity, respiratory muscle strength and endurance of patients with rheumatoid arthritis

Patients with rheumatoid arthritis (RA) show lower cardiorespiratory fitnes s than normal subjects. This study was planned to investigate the pulmonary function tests (PFT), respiratory muscle strength and endurance, and aerob ic capacity of patients with RA, as well as the relationship of these param eters to clinical and functional status. Twenty-five RA patients aged 25-71 (48.52 +/- 14.09) and 21 control subjects aged 25-66 (45.67 +/- 13.27) par ticipated in the study. PFT, maximum volunteer ventilation, maximum inspira tory and maximum expiratory pressures and cardiorespiratory exercise tests were carried out in all subjects to evaluate the respiratory involvement, i nspiratory and expiratory muscle strength and endurance, and aerobic capaci ty. Patients' duration of disease, smoking and alcohol habits, duration of morning stiffness, visual analogue scale scores, ARA functional classificat ions and Ritchie articular indexes were recorded. All the patients and cont rol subjects were non-exercising individuals. As a result. we found that RA patients have normal PFT but reduced respiratory muscle strength and endur ance, and also reduced aerobic capacity compared to controls. According to this result, respiratory and aerobic exercises may be recommended to improv e respiratory muscle strength and endurance and aerobic capacity in these p atients.