RT Journal Article
T1 Effects of two types of training on pulmonary and cardiac responses to moderate exercise in patients with COPD
A1 Sánz, M.L
A1 Sánz, P
A1 Ruíz de Oña, J.M
A1 Rodríguez Hermosa, Juan Luis
A1 Whipp, B.J
A1 Puente Maestu, Luis
AB The effects of two 8-week programmes of exercise reconditioning on the time constants (tau) of the pulmonary gas exchange, ventilatory and heart rate responses to moderate intensity exercise in patients with chronic obstructive pulmonary disease (COPD) were studied. Thirty-five subjects (mean+/-SD 64+/-5 yrs; forced expiratory volume in one second (FEV1) 1.09+/-0.17 L; 41+/-6.2% predicted) were randomly assigned either to supervised (s) training on a treadmill, 4 days x week(-1) (group S; n=21) or self-monitored (SM) walking 3 or 4 km in 1 h 4 days x week(-l) (group SM; n=20). The different levels of supervision resulted in a different estimated intensity of training (35+/-10 W in the SM group and 70+/-22 W in the S group). The kinetics were evaluated with a constant-load exercise test on a cycle-ergometer at a work rate corresponding to 80% the highest oxygen consumption (V'O2) that can be achieved without blood lactic acidosis (V'O2,LAT) or 50% of V'O2,max, if maximum oxygen consumption V'O2,LAT was not found. Mean endurance time at a work rate equivalent to 70% of the pretraining V'O2,max increased by 493+/-281 s in the S group and 254+/-283 s in the SM group (p<0.001). Mean tauV'O2 decreased from 83+/-17 s to 67+/-11 s (p<0.0001) in the S group and from 84+/-12 to 79+/-16 (p=0.04) in the SM group. Mean tau for carbon dioxide output minute ventilation and heart rate were also speeded after training, again more markedly in the S group. In the S group there was a significant correlation between the decrease in tauV'O2 and the increase in endurance time (r=-0.56, SEM=0.21). It is concluded that training speeds the kinetic response of oxygen consumption, carbon dioxide production, minute ventilation and heart rate to moderate exercise and that the effect is greater after supervised, more intense training.
PB European Respiratory Society
SN 0903-1936
SN 1399-3003
YR 2000
FD 2000-06-01
LK https://hdl.handle.net/20.500.14352/98424
UL https://hdl.handle.net/20.500.14352/98424
LA eng
NO Puente-Maestu L, Sánz ML, Sánz P, Ruíz de Oña JM, Rodríguez-Hermosa JL, Whipp BJ. Effects of two types of training on pulmonary and cardiac responses to moderate exercise in patients with COPD. Eur Respir J. 2000 Jun;15(6):1026-32
DS Docta Complutense
RD 25 abr 2025