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Apical rotation in all 12 healthy subjects at rest (solid line), at lower body negative pressure (LBNP) −20 mmHg (dotted line) and −40 mmHg (middle dash line). Upwards and downwards directed curves (values) correspond to counterclockwise and clockwise rotation, respectively. Time 0 represents end-diastole and time points of aorta valve closure (AVC) and mitral valve opening (MVO) are presented at rest and LBNP −40 mmHg.
