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. 2015 Aug 17;10:1651–1661. doi: 10.2147/COPD.S81736

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© 2015 Mazzuco et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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Correlation between HRV indices (deltas) and variables from lung function tests. Data are presented as the correlation coefficient (r).

Notes: *P<0.05. Δsupine-sitting, HRV index in supine position minus HRV index in seated position; Δsitting-M-, HRV index in seated position minus HRV index during M-RSA.

Abbreviations: M-RSA, respiratory sinus arrhythmia maneuver; HF (nu), high frequency in normalized units; SD1, standard deviation measuring dispersion of points in the plot perpendicular to the line-of-identity; SD2, standard deviation measuring dispersion of points along the line-of-identity; alpha1, short-term fluctuations of detrended fluctuation analysis; FEV₁, forced expiratory volume in 1 second; DL_CO, diffusion lung capacity for carbon monoxide; Raw, airway resistance; RV, residual volume; IC/TLC, inspiratory capacity/total lung capacity ratio; RV/TLC, residual volume/total lung capacity ratio; HRV, heart rate variability.