[Readjustment of peripheral factors during the unsteady-state phase of dynamic muscular exercise]

The behaviour of the ratio: oxygen extraction (total peripheral resistance (DAV/TPR) in a group of untrained healthy young male students has been bloodless investigated during the unsteady-state phase of the dynamic muscular exercise (2.5 watt/Kg). The results obtained have shown that the kinetics of the ratio, from a resting value of 3.40 ml O2 . min-1 . mmHg-1 to a figure of 17.62 (steady-state) doesn't follow a step function. During the first 30 seconds the percentual increase of the ratio falls to 0.45, becomes 1.5 thirty seconds later and there this exponentially drops down to a value of 1. The observed behaviour agrees with experimental findings of other authors.