The Relationship Between Blood Perfusion in the Lower Extremities and Heart Rate Variability at Different Positions

Figures

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  Figure 1. Schematic diagram of positions and recordings.

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  Figure 2. Change in heart rate variability (HRV). (A) RR intervals of the ECGs. (B) Mean RR intervals at each body position. (C) RMSSD at each body position. (D) LF/HF power ratio at each body position.

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  Figure 3. Blood perfusion in both lower extremities at different body positions. (A) Recording position at ST 36. (B) Raw data of blood flux in the left (blue) and right (red) lower extremities. (C) The blood flux was significantly different between the right (R) and left (L) sides in the horizontal position. (D) The blood flux was not significantly different between the R and L sides in the up position. (E) The blood flux was not significantly different between the R and L sides in the down position.

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  Figure 4. Relationship between sample entropy of HRV and refined composite multiscale entropy (RC MSE) of blood flux signals. (A). There were no significant differences in the RC MSE of blood flux signals at different positions between the left and right lower extremities. (B). The HRV is negatively correlated to the complexity area of the RC MSE blood flux signal in the right lower extremity in the down position, Spearman’s correlation coefficient (SCC).

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  Figure 5. Relationship between sample entropy of HRV and refined composite multiscale fuzzy entropy (RC MFE) of blood flux signals (A) There were no significant differences in the RC MFE of blood flux signals at different positions between the left and right lower extremities (B) The HRV is negatively correlated to the complexity area of the RC MFE blood flux signal in the right lower extremity in the down position, SCC.