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Oxygen uptake during walking in patients with rheumatoid arthritis--a controlled study



Oxygen uptake during walking in patients with rheumatoid arthritis--a controlled study



Journal of Rheumatology 31(4): 655-662



To analyze the energy expenditure of patients with rheumatoid arthritis (RA) of functional classes I, II, and III during walking at different speeds on a treadmill. Thirty-five consecutive patients selected from the rheumatology outpatient clinic were studied and compared with a control group consisting of 35 healthy individuals paired for age, sex, body weight, and body mass index. An incremental test on a treadmill consistent with normal walking was developed, with metabolic analysis performed at 30 s intervals using a gas analyzer connected to a computerized system. Heart rate, rate of perceived exertion, visual analog scale of pain, Ritchie index, the Scale of the Escola Paulista de Medicina for Evaluation of Articular Movement Range, and the Health Assessment Questionnaire were also used to evaluate functional capacity. Patients with RA showed a greater energy expenditure than controls at the following walking speeds: 3.0 km/h (RA = 229.36 +/- 56.47 kcal/h; controls = 197.44 +/- 52.59), 4.5 km/h (RA = 266.41 +/- 58.94 kcal/h; controls = 231.41 +/- 56.14), and 5.0 km/h (RA = 289.11 +/- 65.35 kcal/h; controls = 250.18 +/- 56.67). Patients with RA presented higher values for all test measures except heart rate. The functional class II group differed significantly from the controls, whereas the functional class I group had values close to normal. Patients with RA had a greater energy expenditure during walking compared to healthy controls under the same conditions, and patients with functional class II experienced a greater energy expenditure compared to controls.

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Accession: 049839030

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PMID: 15088289


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