Low‐frequency heart rate variability is related to the breath‐to‐breath variability in the respiratory pattern. (3rd December 2013)

• Record Type: Journal Article
• Authors: Beda, Alessandro; Simpson, David M.; Carvalho, Nadja C.; Carvalho, Alysson Roncally S.
• Is Part Of: Psychophysiology. Volume 51:Number 2(2014:Feb.)
• Page Start: 197
• Page End: 205
• Publication Date: 2013-12-03
• Subjects: Psychophysiology -- Periodicals; 612.8
• DOI: 10.1111/psyp.12163
• Languages: English
• ISSNs: 0048-5772

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>Changes in heart rate variability (HRV) at "respiratory" frequencies (0.15–0.5 Hz) may result from changes in respiration rather than autonomic control. We now investigate if the differences in HRV power in the low‐frequency (LF) band (0.05–0.15 Hz, HRV_LF) can also be predicted by respiration variability, quantified by the fraction of tidal volume power in the LF (V_LF_{, n}). Three experimental protocols were considered: paced breathing, mental effort tasks, and a repeated attentional task. Significant intra‐ and interindividual correlations were found between changes in HRV_LF and V_LF_{, n} despite all subjects having a respiratory frequency above the LF band. Respiratory parameters (respiratory period, tidal volume, and V_LF_{, n}) could predict up to 79% of HRV_LF differences in some cases. This suggests that respiratory variability is another mechanism of HRV_LF generation, which should be always monitored, assessed, and considered in the interpretation of HRV changes.</p> </abstract>