Respiratory parameters (respiratory period, tidal volume, and V(LF,n)) could predict up to 79% of differences in low-frequency heart rate variability.
Observational
Does breath-to-breath variability in the respiratory pattern predict low-frequency heart rate variability?
Respiratory variability is a significant mechanism of low-frequency heart rate variability generation and should be accounted for in HRV interpretation.
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.
Beda et al. (Tue,) reported a observational. Experimental protocols (paced breathing, mental effort tasks, repeated attentional task) was evaluated on Correlation between changes in low-frequency heart rate variability (HRV(LF)) and respiration variability (V(LF,n)). Respiratory parameters (respiratory period, tidal volume, and V(LF,n)) could predict up to 79% of differences in low-frequency heart rate variability.