”…respiratory training significantly increased the endurance time of respiratory muscles…blood lactate concentrations were reduced during post training exercise…respiratory trained subjects had lost the sensation of breathlessness.”
Source: Boutellier et al, 1998.
”Respiratory endurance increased…cycling endurance time was prolonged…blood lactate concentration was lower. We speculate that the reduction in blood lactate concentration was most likely caused by an improved lactate uptake by the trained respiratory muscles.”
Source: Boutellier et al, 1999.