The uptake of HRV is performed via a heart rate monitor Polar ® brand of, RS800CX model where the FC signal is received by a strap to the signal receiver which is placed in the voluntary thorax at the level of the xiphoid the sternum. This funding is recorded in the Polar RS800CX monitor and transferred to the Software Polar ProTrainer program through a broadcast interface infrared signals, which are stored and subsequently exported to txt format so that later can be analyzed by a mathematical routine in Kubios HRV program. In the program will be selected 5 minutes from the passage that has better signal stability.