Unexpected Course of Nonlinear Cardiac Interbeat Interval Dynamics during Childhood and Adolescence
Figure 3
Course of the frequency domain measures during childhood and adolescence.
HF – high frequency component, LF – low frequency component, VLF – very low frequency component, ULF – ultra low frequency component, ln ms2 – natural logarithm of the absolute values in ms2, ln LF/HF - natural logarithm of the ratio LF/HF. The circles represent 24 h averages. Solid and dashed lines show moving average and the fitted polynomial model of order 3, respectively.
