Ventilatory Determinants of Self-selected Walking Speed in Chronic Heart Failure

• DOI: 10.1249/mss.0b013e318277968f
• Publication Date: 2013-02-01T17:27:41Z
• Authors: PAULA FIGUEIREDO; PAULA A. B. RIBEIRO; RENATA L. BONA; LEONARDO A. PEYRÉ...; JORGE P. RIBEIRO
• Keywords: Treadmill

In healthy subjects, the self-selected walking speed (SSWS) corresponds to lowest cost of transport (CT). This study tested hypothesis that SSWS could be determined by work breathing instead CT in patients with chronic heart failure (CHF).Seventeen CHF due left ventricular systolic dysfunction and 17 controls were compared. Both groups submitted a protocol on treadmill at SSWS, two speeds below (-0.5 -1.0 km·h), above (+0.5 +1.0 km·h). The ventilatory efficiency, as equivalent for carbon dioxide (V˙E/V˙CO2), compared.CHF had lower than (0.75 ± 0.14 vs 0.98 0.30 m·s, P < 0.01). Among five speeds, controls' was most economical. For patients, less economical higher speeds. However, V˙E/V˙CO2 when compared other both groups.In contrast what happens where has CT, choose an but cost. These findings are compatible concept interventions enhance efficiency may increase CHF.