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Encouraged 6-min walking test indicates maximum sustainable exercise in COPD patients
CASAS A; VILARO J; RABINOVICH R; MAYER A; BARBERA JA; RODRIGUEZROISIN R; ROCA J
CHEST , 2005, vol. 128, n° 1, p. 55-61 Doc n°: 120663 Localisation : Documentation IRR Descripteurs : FD331 - BRONCHITE CHRONIQUE - BRONCHIOLITE In patients with moderate-to-severe COPD, an encouraged 6-minwalking test (6MWT) is a high-intensity submaximal exercise protocol that shows an oxygen uptake (Vo(2)) plateau after the third minute of the test. This last feature prompted the hypothesis that self-paced walking speed is set to achieve ''maximal'' sustainable Vo(2), namely ''critical power'' or ''critical speed.'' Patients and methods: Eight patients with moderate-to-severe COPD (mean age, 68 +/- 7 years [+/- SD]; FEV1, 50 +/- 13% predicted; Pao(2), 69 +/- 8 mm Hg) underwent the following tests on different days in order: (1) encouraged 6MWY; (2) standard incremental shuttle test to identify peak walking speed; (3) four different high-intensity, constant walking speed tests to exhaustion to calculate critical walking speed; and (4) timed walking test at critical walking speed (CWS) to examine sustainability of the exercise. Results: 6MWT and CWS showed similar results (mean of last 3 min): Vo(2) (1,605 +/- 304 mL/min vs 1,584 +/- 319 mL/min), minute ventilation (47 +/- 12 L/min vs 48 +/- 11 L/min), respiratory exchange ratio (0.89 +/- 0.1 vs 0.90 +/- 0.1), heart rate (130 +/- 18 beats/min vs 131 +/- 16 beats/min), Borg dyspnea score (5.4 +/- 1.3 vs 5.5 +/- 2.4), and walking speed (1.49 +/- 0.1 m/s vs 1.44 +/- 0.1 m/s, respectively). Conclusion: This study supports that 6MWT indicates maximum sustainable exercise that might be related with its predictive value in COPD patients. Langue : ANGLAIS Tiré à part : OUI |
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