Eleven young male adults underwent a crossover design of two Resistance Training protocols performed with 30% of 1RM or 80% of 1RM until volutional fatigue. Both protocols were composed by 3 sets of leg extension using the corresponding intensities (30% or 80% of 1RM) until fatigue. Participants were measured for oxygen consumption and peak blood lactate concentration during exercise and 60 minutes postexercise after each bout to determine Energy Expenditure and post-exercise oxygen consumption