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. 2014 Nov 27;3:696. doi: 10.1186/2193-1801-3-696

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© Bongers et al.; licensee Springer. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Changes in VE/ VO ₂-slope, VE/ VCO ₂ -slope, and P _ET CO ₂ during exercise at similar percentages of VO _2peak in the healthy adolescents and the adolescents with CF. Dashed lines represent the ventilatory threshold in both groups. Abbreviations: CF = cystic fibrosis; P_ETCO₂ = partial end-tidal carbon dioxide tension; VE/VCO₂-slope = slope of the relationship between minute ventilation and carbon dioxide output; VE/VO₂-slope = slope of the relationship between minute ventilation and oxygen uptake; VO_2peak = peak oxygen uptake. *P < 0.05; **P < 0.01.