Obrist did a lot of work on the effect of sympathetic and parasympathetic influences on heart. He observed that when heart rate is generally parasympathetically mediated, heart rate increases are due to metabolically appropriate conditions: they appear to be coupled with increases in EMG. When HR increases are sympathetically mediated, they become uncoupled with somatic demands. Steven Porges at University of Illinois extended this work and published a lot in Psychophysiology during the mid to late 80's. And of course, the real pioneer in this area was Wenger with the concept of autonomic balance (nobody does work like that anymore!) jbm
The best collection of Obrist's work I know of is below. It may be a little old, but it is incredible research.
Author: Obrist, Paul A.
Title: Cardiovascular psychophysiology : a perspective / Paul A. Obrist.
Publisher: New York : Plenum, c1981.
Description: Book
x, 236 p. : ill. ; 24 cm.
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