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Instantaneous amplitude (iA) as a stress parameter. Observe its advantage over the low- (LF) and high-frequency (HF) power parameters, especially in the presence of artifacts of short duration and large amplitude, such as in the segment Rest 3: LFiA and HFiA are not affected by them. The results based on the raw NNI are designated in blue, and the results based on a preprocessed NNI time series, where sharp features have been removed, in orange.
