Predicting race time in male amateur marathon runners So far, there have been some attempts to develop formula to predict the marathon period as accurately as possible. A Spanish group has now measured various variables (physique, training, muscle strength, ruffier test) in 84 men and looked at which variables the time can be predicted.Many of the variables correlated with the term. There were 2 models in which body fat, changing the heart rate in recovery after the ruffier test and the half-marathon time (model 1) as well as body fat, change in heart rate in recovery after the ruffier test and the 10 km time (model2) The competition time could predict best. The complete analysis can be found under https://pubmed.ncbi.nlm.nih.gov/27385548/