Intercostal muscle blood flow limitation during exercise in chronic obstructive pulmonary disease

American Journal of Respiratory and Critical Care Medicine
Ioannis VogiatzisSpyros Zakynthinos

Abstract

It has been hypothesized that, because of the high work of breathing sustained by patients with chronic obstructive pulmonary disease (COPD) during exercise, blood flow may increase in favor of the respiratory muscles, thereby compromising locomotor muscle blood flow. To test this hypothesis by investigating whether, at the same work of breathing, intercostal muscle blood flow during exercise is as high as during resting isocapnic hyperpnea when respiratory and locomotor muscles do not compete for the available blood flow. Intercostal and vastus lateralis muscle perfusion was measured simultaneously in 10 patients with COPD (FEV₁ = 50.5 ± 5.5% predicted) by near-infrared spectroscopy using indocyanine green dye. Measurements were made at several exercise intensities up to peak work rate (WRpeak) and subsequently during resting hyperpnea at minute ventilation levels up to those at WRpeak. During resting hyperpnea, intercostal muscle blood flow increased with the power of breathing to 11.4 ± 1.6 ml/min per 100 g at the same ventilation recorded at WRpeak. Conversely, during graded exercise, intercostal muscle blood flow remained unchanged from rest up to 50% WRpeak (6.8 ± 1.3 ml/min per 100 g) and then fell to 4.5 ± 0.8 ml/min pe...Continue Reading

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