Abstract

VILLA JIMENEZ, Ivonne et al. Ventilation and blood lactate in children during a maximal incremental cycling test. Nutr. Hosp. [online]. 2016, vol.33, n.2, pp.459-463. ISSN 1699-5198.  https://dx.doi.org/10.20960/nh.132.

This study analyzes the ventilatory response in 46 male children (8.28 ± 1 year) during a maximal incremental test in cycle ergometer and the blood lactate concentrations at the end of the test. The increase was 10 watts every minute starting at 25 watts. During the test the expired air was collected through a facial mask and analyzed breath by breath. The second ventilatory threshold (VT₂) was determined according to gas exchange methods. All children carried out a maximum power (P_max) of 82.4 ± 1.6 W and a peak oxygen consumption (VO₂) of 44.69 ± 3.01 mL/kg/min. The VT₂ was at 86.5% of peak VO₂. The blood lactate at the end of the test was 9.65 ± 1.58 mM/L. The blood lactate concentrations are much higher than those reported in most studies and they do not seem to be different to those observed in well-trained sportsmen at the end of a similar test. We obtained the equation for the relationship between carbon dioxide production (VCO₂) and ventilation (VE) and it was linear (y = 0.0324x - 0.008; R² = 0.999). When compared with adults previously assessed in our laboratory (y = 0.0347x + 0.1452; R² = 0.9854) they were practically identical. This may be a good argument to consider the ability for eliminating carbon dioxide in children as high as that in adults.

Keywords : Anaerobic metabolism; Anaerobic power; Ventilation; Exercise; Children; Lactate.

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