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. 2019 Apr 23;14(4):e0215997. doi: 10.1371/journal.pone.0215997

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© 2019 Brat et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — Slopes of V_E/VCO₂ and ratio of tidal volume to dead space (V_D/V_T) at peak exercise are compared in patients with HVS and controls. The shift of the slope of this relationship in patients with HVS is consistent with the observed lower PaCO₂ (i.e. increased ventilatory drive).