Rita Di Leo, Giuseppe Vita, Corrado Messina, Vincenzo Savica 

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Autonomic function in elderly uremics studied by spectral analysis of heart rate  Rita Di Leo, Giuseppe Vita, Corrado Messina, Vincenzo Savica  Kidney International  Volume 67, Issue 4, Pages 1521-1525 (April 2005) DOI: 10.1111/j.1523-1755.2005.00231.x Copyright © 2005 International Society of Nephrology Terms and Conditions

Figure 1 Components of the power spectrum of heart rate variability in a normal subject on lying and on standing. LF is low-frequency band; HF is high-frequency band. Kidney International 2005 67, 1521-1525DOI: (10.1111/j.1523-1755.2005.00231.x) Copyright © 2005 International Society of Nephrology Terms and Conditions

Figure 2 Comparison of linear regression models [age vs. low-frequency (LF) band value] obtained in controls (• and thick line) and in uremics (^ and thin line) on lying (A) and on standing (B) positions. There was a significant difference in the slope of regression line on lying (P < 0.03) and on standing (P < 0.04). Kidney International 2005 67, 1521-1525DOI: (10.1111/j.1523-1755.2005.00231.x) Copyright © 2005 International Society of Nephrology Terms and Conditions

Figure 3 Comparison of linear regression models [age vs. high-frequency (HF) band value] obtained in controls (d and thick line) and in uremics (s and thin line) on lying (A) and on standing (B) positions. There was no significant difference. Kidney International 2005 67, 1521-1525DOI: (10.1111/j.1523-1755.2005.00231.x) Copyright © 2005 International Society of Nephrology Terms and Conditions

Figure 4 Comparison of linear regression models [age vs. low-frequency/high-frequency (LF/HF) value] obtained in controls (d and thick line) and in uremics (s and thin line) on lying (A) and on standing (B) positions. There was a significant difference in the slope of regression line only on standing (P < 0.05). Kidney International 2005 67, 1521-1525DOI: (10.1111/j.1523-1755.2005.00231.x) Copyright © 2005 International Society of Nephrology Terms and Conditions