%0 Journal Article
%T COPD patients' oxygen uptake and heart rate on-kinetics at cycle-ergometer: correlation with their predictors of severity
%A Bruna V. Pessoa
%A Thomas Beltrame
%A Val谷ria A. Pires Di Lorenzo
%A Aparecida M. Catai
%J Brazilian Journal of Physical Therapy
%D 2013
%I Associa??o Brasileira de Pesquisa e P車s-Gradua??o em Fisioterapia
%X OBJECTIVES: To assess whether there is a correlation between oxygen uptake (VO2) and heart rate (HR) on-kinetics in the constant-load cycle-ergometer test (CLT) and the BODE index and its isolated variables in patients with chronic obstructive pulmonary disease (COPD). METHOD: Fourteen male patients between 55 and 78 years of age with moderate to severe COPD were evaluated. Each patient underwent spirometry, the six-minute walk test (6MWT), the cycle-ergometer incremental test (IT) and CLT on alternate days. The exhaled gases were collected, and the VO2 and HR on-kinetics were analyzed. The BODE index was calculated. RESULTS: It was noted that the VO2 tau (而) and mean response time (MRT) were significantly higher than HR 而 and MRT. Moderate and strong correlations between 而 and MRT of the VO2 and HR and the BODE index was noted (r=0.75 and r=0.78; r=0.62 and r=0.63, respectively), and there were correlations between the VO2 而 and MRT and the forced expiratory volume in one second (FEV1) (r=-0.60; r=-0.53) and the distance traveled at 6MWT (DT-6MWT) (r=-0.61; r=-0.44) and DT-6MWT % predicted (r=-0.62; r=-0.46). The HR 而 and MRT were correlated with DT-6MWT (r=-0.59; r=-0.58) and DT-6MWT % predicted (r=-0.62; r=-0.62). CONCLUSION: The slowing of cycle-ergometer VO2, and especially of HR on-kinetics, may be key markers of disease severity. Furthermore, airflow obstruction and reduced exercise capacity are associated with the slowing of patients' VO2 and HR on-kinetics. OBJETIVOS: Verificar se h芍 correla  o entre a cin谷tica-on do consumo de oxig那nio (VO2) e da frequ那ncia card赤aca (FC) no teste de carga constante em cicloerg metro (TCC) com o 赤ndice BODE e suas vari芍veis isoladas em pacientes com doen a pulmonar obstrutiva cr nica (DPOC). M谷TODO: Foram avaliados 14 homens com DPOC de obstru  o moderada a muito grave, entre 55 e 78 anos, submetidos em dias alternados 角 espirometria, teste de caminhada de seis minutos (TC6), teste incremental em cicloerg metro (TI) e TCC. Foram coletados os gases expirados, e a cin谷tica-on do VO2 e da FC foi analisada. O 赤ndice BODE foi calculado. RESULTADOS: Observou-se que a tau (而) e o tempo de resposta m谷dia (TRM) do VO2 foram significativamente maiores que a 而 e o TRM da FC. Observou-se correla  es moderadas e fortes entre a 而 e o TRM do VO2 e da FC com o 赤ndice BODE (r=0,75 e r=0,78; r=0,62 e r=0,63, respectivamente) e correla  es entre a 而 e o TRM do VO2 com o volume expirat車rio for ado no primeiro segundo (VEF1) (r=-0,60; r=-0,53), a distancia percorrida no TC6 (DP-TC6) (r=-0,61; r=-0,44) e a DP-TC6 %prevista (r=-0,62;
%K DPOC
%K consumo de oxig那nio
%K cin谷tica
%K frequ那ncia card赤aca
%K fisioterapia
%K 赤ndice de gravidade de doen a
%K COPD
%K oxygen uptake
%K kinetics
%K heart rate
%K physical therapy
%K disease severity index
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-35552013000200152