Efeito do trabalho de caminhada sobre a cinética on e off da frequência cardíaca em pacientes com DPOC.

Abstract

Introduction: Chronic Obstructive Pulmonary Disease (COPD) presents cardiopulmonary interactions that are important for patients, which can be difficult to explore mainly during exercise. Objective: To analyze the effect of walking work on heart rate (HR) on and off kinetics during the Six-Minute Walk Test (6MWT) in patients with COPD. Methods: Cross-sectional, retrospective, analysis of secondary data from the database of a research project. Variables collected: clinics, pulmonary function, functional capacity (6MWT), 6MWT walking work using the equation T = F x D (T = Work, F = Strength/Weight, D = Distance), HR kinetics on and off [average HR value in the last minute of the baseline (A0), amplitude of the steady-state HR response (A1), time delay to start the HR response (TD), exponential curve time constant (TAU) and mean HR response time (TMR = TAU + TD)]. Results: 11 male patients (n=6), overweight (28.9 kg/m2), high cardiovascular risk (n=10) and COPD ranging from moderate to very severe (n=11) were evaluated. The kinetics on and off of HR showed similar behavior, both with slowing, but without significant difference. The walking work had a large effect size on all the variables of the kinetics on and off of HR. Associations between HR on and off amplitudes and between the HRrec 1min variation delta and resting SpO2 were observed. Conclusion: Patients with COPD showed an attenuated HR response at the beginning and at the end of the exercise and this seems to be related to low peripheral oxygen saturation at rest, inferring a great effect of walking work on all the variables of the HR kinetics on and off.