Kinetics of muscle deoxygenation are accelerated at the onset of heavy-intensity exercise in patients with COPD: relationship to central cardiovascular dynamics - Chiappa, G R; Borghi-Silva, A; Ferreira, L F; Carrascosa, C; Oliveira, C C; Maia, J; Gimenes, A C; Queiroga, F, Jr; Berton, D; Ferreira, E M; Nery, L E; Neder, J A (J Appl Physiol, 2008)