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. 2014 Jun 11;2(6):e12038. doi: 10.14814/phy2.12038

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© 2014 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — HR recordings during the activity and recovery phase of the 6‐min walk test (6MWT). Two patients in each group are presented. X‐axis shows the time in seconds and the Y‐axis the percentage change in HR. PAH, pulmonary arterial hypertension; OLD, other lung diseases.