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Example, in one subject (# 9) of M-wave consistency during the three experimental conditions [volitional underlying effort, (A); single breath inspiratory threshold loading (ITL), (B); sustained inspiratory threshold loading (ITL), (C)]. M-wave could differ in shape and amplitude between conditions (in line with known effects of lung volume and thoracoabdominal configuration), but were consistent within a given conditon (see “data management” in “Methods,” 2.5.2).
