Abstract des Autors

The relationships of femoral venous (K+), (H+), osmolality (OSM) PO2, and (inorganiv phosphate) (IPI) with heart rate (HR), ventilation (VE), and calculated leg blood flow (Q) were investigated during bicycle exercise in endurance trained (TR) and untrained (UT) test subjects. At a given VO2 the increases of (K+), (H+), OSM, (Pi) and the decrease of PO2 were significantly lower in TR than in UT.In the same proportion the increases of HR, VE, and Q were diminished. Thus in TR and UT identical and highly significantly correlated regression lines of (K+), (H+), OSM, (Pi), and PO2 with HR, VE, and Q were obtained. These constituents changed in the same proportion as the relative VO2 in TR and UT. No relationships with (Na+), C++), and (Mg++) were found. By means of a multiple regression analysis the partial influence of K+, H, OSM, PO2, and Pi upon the total change of HR, VE, and Q was estimated, to compare with data from infusion experiments. The findings were discussed in view of the hypothesis that these candidates may provide a possible linkage between metabolic events, circulatory, and ventilatory adjustments during work.