Table 2.

Hemodynamic properties

0 Hz15 Hz, %Change45 Hz, %Change
HR, beats/min
    Supine65±2−1±10±2
    Upright 35°72±2−3±20±2
MAP arm, mmHg
    Supine88±47±64±5
    Upright 35°92±3−6±61±1
MAP leg, mmHg
    Supine88±47±64±5
    Upright 35°124±4−2±23±2
Pv leg, mmHg
    Supine13±114±7*16±6*
    Upright 35°27±2−1±23±2
SGP calf blood flow, ml·100 ml−1·min−1
    Supine2.4±.312±911±8
    Upright 35°1.2±.233±22*46±17*
SGP leg arterial resistance, mmHg·ml−1·100 ml·min
    Supine41±7−6±7−4±5
    Upright 35°126±2811±157±9
SGP leg venous resistance, mmHg·ml−1·100 ml·min
    Supine1.3±.48±12−10±10
    Upright 35°1.2±.411±40−27±12*
IPG calf segmental flow, ml/min
    Supine137±1810±4*30±7*
    Upright 35°99±1532±12*47±14*
IPG pelvic segmental flow, ml/min
    Supine707±9031±1526±9*
    Upright 35°713±8022±1535±11*
IPG visceral segmental flow, ml/min
    Supine1,906±2536±911±14
    Upright 35°1,288±3020±157±14
IPG thorax segmental flow, ml/min
    Supine3,506±32210±5*20±7*
    Upright 35°2,688±28716±817±7*
  • Values are means ± SE. HR, heart rate; MAP, mean arterial pressure; SGP, strain-gauge plethysmography; IPG, impedance plethysmography.

  • * P < 0.05 compared with 0 Hz;

  • P < 0.05 compared with supine.