Test of a snorkel designed to evaluate vo2 during the swim

Abstract

Objective: To determine whether the use of a device designed and built in Argentina allows the proper registration of VO2 during swimming.

Methodology: The kinesis of the VI2 was studied in a swimmer with and without the use of the designed snorkel that has 2 valves at the height of the nozzle and 2 at the exit, where the CO2 is expelled and the O2 enters. The position of the valves creates a continuous circulation circuit allowing ventilation without resistance.

Results: Differences were studied in VO2 with a single mask and with added snorkel, which presented a significance of 0.154 (without significant differences). The 95% confidence intervals were calculated for both the upper limit (3.3185216) and the lower limit (-5.5405216), studying the concordance of the methods using the Bland Altman Model: To determine the bias of the outliers values, linear regression was made between the difference (dependent variable) and the means (independent variable). The Beta coefficient (-. 228) was determined and the significance of the regression was 0.190,
concordance of the data was considered acceptable.

Conclusions: The agreement between the records with mask and snorkel is acceptable so that the device can be used in the sampling of gases to evaluate VO2 and VCO2 in
studies conducted during the swim.