Comparação da cinética do consumo de oxigênio, frequência cardíaca e ventilação minuto entre cicloergometro e degrau em pacientes com DPOC

Abstract

Chronic Obstructive Pulmonary Diseases (COPD) is one of the major causes of morbidity and mortality worldwide, causing important morbidity related to physical activity, affecting quality of life. It is characterized by airflow limitation and installation of inflammatory processes in the lungs, bringing also significant extrapulmonary implications, where these changes can aggravate already installed COPD, therefore contributing to the severity of the disease. This study aimed to compare parameters between cycle ergometer test and step test in regression models of six minute and four minute in COPD patients, as well as compare the constant values of time between modes. Were submitted to pulmonary function test and cardiopulmonary exercise test (CPET) in moderate intensity and constant load on the cycle ergometer test and step test, in 9 volunteer patients participated in a randomized way with a diagnosis of COPD Stage II and III with a mean age of 59,7 ± 7,5 years and mean FEV1 of 49,6 ± 12.8% predicted, and all male. In the comparison of 4 minute and 6 minute models (p = 0,566) there was no significant statistically difference between the cycle ergometer test and step test. There was also no significant difference between the phase II tau time constant for variables of oxygen uptake (V'O2), heart rate (HR) or minute ventilation (V'E) (p> 0,05 for all). This study demonstrated that the protocol of power applied step test in moderate intensity for COPD patients was adequate for the exponential expected response, with amplitude and time constant similar average to the cycle ergometer, but no statistical differences in the time constant in moderate exercise for the modalities.