CARDIODYNAMIC RESPONSES DURING SEATED AND SUPINE RECOVERY FROM SUPRAMAXIMAL EXERCISE

The cardiodynamic responses of 9 healthy men (mean age +/- SD, 22.3 +/ - 2.0 yrs) were measured during seated and supine passive recovery fol lowing the Wingate Anaerobic Power Test (WAPT). Stroke index (SI) was determined noninvasively using impedance cardiographic techniques. Dur ing the initial stages of seated recovery, SI progressively increased (1 min, 60.4 +/- 6.6 ml/m(2); 3 min, 64.6 +/- 5.9 ml/m(2)) and achieve d peak levels by 5 min (70.5 +/- 6.2 ml/m(2)). Between Minutes 3 and 1 0 of seated recovery, SI was significantly (p less than or equal to 0. 05) higher than the preexercise value (46.0 +/- 4.0 ml/m(2)). A simila r response pattern for Sr was observed during supine recovery, The sys temic vascular resistance index (SVRI) decreased by 101% and 114% from preexercise baseline values after I min of recovery in the supine and seated postures, respectively. The persistent rise in SI during the f irst 10 min of passive seated recovery may be explained by the sustain ed attenuation in SVRI coupled with the anticipated residual myocardia l inotropic effects following the WAFT.