RESUMEN
Objective To study the relationship between the constant work rate exercises and dynamic hyperinflation in patients with stable COPD. Methods Routine lung ventilation function and 80%Wmax constant power bicycle ergometer exercises were tested in 30 stable COPD patients. We analyzed the correlation coefficient of Time of tolerant exercise , degree of dyspnea , VO2 max%, VO2 @kgmax% and IC%. Results All COPD patients existed varying degrees of exercise capacity accompaning with dynamic hyperinflation in the bicycle ergometer exercises. By Spearman correlation analysis , the VO2 @kg% of constant power exercises in patients with COPD is correlated with the DH% (r = -0.480, P = 0.007) and ICq% (r = 0.667, P = 0.01). Conclusion Dynamic hyperinflation is probably the prominent factors for the capability of constant work rate exercises in patients with stable COPD. Inhibition of dynamic hyperinflation may help improve exercise capability in patients with constant power exercise.