<p>The article propose an equation to estimate the heart rate (HR) in physically demanded youth with moderate altitude, because it changes with the child’s growth and to estimate it formulas for specific populations should be used. A descriptive research methodology, of quantitative type in schoolchildren of both sexes, 8-17 years old was used; stratified random sampling, confidence interval 95%. HR is recorded at rest and maximal with MRC in Test Leger; by linear regression the association between variables will be determined, being the predictor HRmax and p = 0.005 for significance level. The investigative process allowed the design of an equation HRmax for youth at moderate altitude, for replication in other regions of Colombia and other countries with similar conditions.</p>