Method to determine body's physiological response to physical exercise for assessing readiness and to provide feedback, and system for implementing the method

A method for determining a body's readiness to respond to physical exercise, using a performance check, and providing feedback to a user, wherein the user starts to perform an exercise and where an earlier performance level is determined in an earlier exercise before the performance check and stored in a memory operably coupled to a data processing unit, the method comprising:

• measuring, by a heart rate sensor, heart rate and determining, by the data processing unit, exercise intensity from measured heart rate, and simultaneously determining the external workload by measuring or inputting manually,
• determining, by the date processing unit, an instant performance level of the user by a relation of exercise intensity and determined external workload, the exercise intensity being determined by measured heart rate,
• comparing, by the data processing unit, the earlier performance level stored in the memory, to the instant performance level,
• determining, by the data processing unit, a readiness index according to the said comparison and, optionally with background information and training history, providing feedback according to the determined readiness index.