title: Spectral analysis of sinus arrhythmia: a measure of mental effort.
mesh_terms: D001146:Arrhythmia, Sinus / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008328:Man-Machine Systems; D011597:Psychomotor Performance / Q000502:physiology*; D014937:Work