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The aim of this study was to derive an equation that validly and reliably estimates the VO2 reached in the IPTL, a maximum stress test for lifeguards. From the results obtained in the first part of the research, a multiple linear regression model was identified. A "stepwise" procedure was established as a variable selection method, where the VO2IPTL was selected as the dependent variable and the maximum time reached in the IPTL (s), the percentage of muscle mass (%) and weight of the participant (kg), as independent variables. This procedure generated a regression model where a high correlation was observed between the 3 independent variables and the dependent variable (R = 0.84; p <.01). From this model, an equation could be generated that allows estimating the VO2max reached in the IPTL. The analysis of the results suggested that the IPTL was a valid and reliable test to estimate VO2 simply which would allow, in the long term, analysis of changes in lifeguards physical conditioning.

Calculating an Equation to Estimate the Maximum Oxygen Uptake in Lifeguards