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. 2014 May 7;5:177. doi: 10.3389/fphys.2014.00177

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Copyright © 2014 Heathers.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The cumulative sums of the normalized components when (A) both were specified, and (B) their interrelationship (slope = −1.003 ± 0.1103, r² = 0.761, n = 20). The dashed line in (B) represents the mathematical identity as previously defined. Points marked as diamonds are LFnu + HFnu <90%, and marked where relevant on Figure 10.