1. An ultrasonic diagnostic imaging system for diagnosing myocardial motion comprising: a probe which acts to transmit ultrasonic waves into a heart and receives echoes in response; an image processor responsive to the echoes which operates to produce a sequence of images of the myocardium over at least a portion of a heart cycle; a myocardial motion analyzer, responsive to the sequence of images, which determines the motion of a plurality of segments of the myocardium; a recruitment processor, responsive to the motion of the segments, which produces an indicator of the cumulative participation of the plurality of segments toward a percentage of the full displacement of the myocardium during the heart cycle and of the relative times of participation of the segments in myocardial motion relative to the percentage of full displacement during the heart cycle; and a display coupled to the recruitment processor which displays the indicator.