Effects of training on above-threshold kinetics of V̇O2, V̇CO2, V̇E, FC and on parameters of incremental tests

We have studied 7 high level fin swimming athletes (Md: years 18.29; cm 174.29; kg 70.43) aiming to compare the effects of a 5-6 weeks aerobic training on the V̇O2, V̇CO2, V̇E, and FC kinetics with the values of these variables and watts (w) achieved at 2 ventilatory thresholds and at V̇O(2max), and with loads at lactate concentration [L] of 4 mmol/l. They have performed pre and post training: 1 incremental maximal test to detect 2 ventilatory thresholds and V̇O(2max); 1 incremental sub maximal test for identifying preselected [L]; 1st supra-threshold constant-load test for the kinetics study employing mathematical models to 1 or to 2 exponential terms fitting on experimental data through an original software. Regarding to V̇O2, we have studied the slow component (cIV̇O2), whose entity has measured from the integral of the relative area; likewise with FC. The fitting on V̇CO2 and VE data with the imposed loads has not been reliable and therefore excluded from the comparison. The cIV̇O2 area has decreased after training 8.77 ml/kg (p=0.002); FC 13.18 b. (p=0.02). In the incremental test w and V̇O2 both have increased with the same significativity (p= 0.05) at 1st ventilatory threshold; at V̇O(2max) the one regarding to w has been better than V̇O2: respectively p= 0.002, and p= 0.02; not present the significative changes for other studied variables. Almost significative the performance at 4 mmol/l threshold after training (p= 0.06). Otherwise, the difference of [L] after training at the same load in pretraining had determined that [L] of 4 mmol/l has decreased of the 22% (p= 0.05). In conclusion, the study of the kinetic above-threshold of V̇O2 and FC, but, with the imposed loads, not of V̇CO2 and VE, it has proven more sensitive than the variations of V̇O2 and FC at V̇O(2max) and of the [L] to the same evoking the 4 mmol/l load in the pretraining in estimate induced advantages from the training.