Effect of training, detraining and deconditioning on V̇O2 slow component

This study was designed to evaluate the effects on V̇O2 slow component (V̇O2sc) of a 7-week aerobic training and of a detraining of the same duration in 4 subjects (I group); and of 4 weeks deconditioning in 3 subjects (II group). The 7 subjects (22.1±0.9 years), physically active, have performed a ramping-test for detecting the 1st ventilatory threshold (Sv1) and maximal aerobic capacity, on which the constant load exercises wattage had selected, always supra-Sv1. These latter have been used for the V̇O2 kinetics study, employing mathematical models with 2 exponential terms fitted on experimental data through an original software. The V̇O2sc entity in O2 ml/kg has been obtained by the integral of the area among the 2 exponential of the mathematical model. As to deconditioning, the group II subjects have stopped each attivity in gym. In group I the V̇O2sc in average, reduced with the training of ∼42%, and increased after detraining of ∼68%; between pretraining and detraining it decreased of 10%. In group II after deconditioning V̇O2sc increased in average of ∼22%- The V̇O2sc reduction with training ad its increase with detraining confirm the results of previous studies. While the deconditioning has increased the V̇O2sc, this is decreased, even a little, between pretraining and detraining. It's likely that the detraining effects influence the V̇O2sc responsible mechanisms in more extended times respect to those from us employed, subsequently to the loss of training-induced advantages.