obrist ( cardiovascular psychophysiology : a perspective , plenum press , new york , 1981 ) has recently argued for the superiority of contractility ( e.g . pulse transit time ) over ventricular repolarization ( e.g . t-wave amplitude ) measures as indices of sympathetic myocardial influences on the grounds that the t-wave occurs during the diastolic portion of the cardiac cycle ( in contrast to the systolic temporal locus of contractile-based measures ) .
C0027061
myocardial
C0018787
cardiac