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. Author manuscript; available in PMC: 2016 Jun 15.
Published in final edited form as: J Breath Res. 2015 Mar 9;9(1):016009. doi: 10.1088/1752-7155/9/1/016009

Figure 4.

Figure 4

Average of estimated alveolar methane concentration and the inverse of the estimated ventilation-perfusion ratio during ergometer tests (n = 5) (a) as a function of time; (b) compared to each other; dotted and dashed lines indicate linear fit to data obtained under exercise (n = 64, R = 0.897, p = 0.018) and non-exercise conditions (n = 36, R = 0.787, p < 0.001), respectively. Line with a slope of unity is denoted by a grey straight line. The alveolar methane concentration, alveolar ventilation, and cardiac output were estimated as given in sections 2.4 and 2.5.