Method for monitoring accumulated body fatigue for determining recovery during exercise or activity

1. Method for providing an index (BFI) depicting a person's accumulated body fatigue, the method comprising the steps of:

measuring the person's intensity of physical activity through one or more parameters from the measurement of one or more signals obtained sequentially as input, said parameters being information on the intensity of the person's physical activity;

setting a predetermined initial value to the index (BFI);

calculating an upslope component and an downslope component of the index (BFI) determined with said parameters;

calculating a combination of the upslope and the downslope components;

calculating each next value of the index (BFI) as a sum of the previous value of the index (BFI) and a difference formed from said combination;

wherein the upslope component and the downslope component are each calculated according to a function, which is scaled by a preset physiological character.

2. Method according to claim 1 , characterized in that the function is independent from the duration of the physical activity.

3. Method according to claim 1 , characterized in that the preset physiological character relates to an accumulated value, which is a function of quantity of body requirements for recovery after exercise and physical activity.

4. Method according to claim 1 , characterized in that the preset physiological character relates to an accumulated value, which is a function of a training effect.

5. Method according to claim 1 , characterized in that the downslope component of the index (BFI) estimates recovery and decrease in the index (BFI) with decreasing physical activity.

6. Method according to claim 1 , characterized in that it is determined a prediction of the time interval after which the user engaged in physical activity is expected to attain a preset limit due to accumulation of body fatigue that is induced by continuing physical activity in the chosen intensity.

7. Method according to claim 1 , characterized in that it is determined by the prediction of the time interval requirements for recovery after the physical activity.

8. Method according to claim 1 , characterized in that information on the increased heart beat level during recovery is determined.

9. Method according to claim 1 , characterized in that the wherein information on the level and recovery of oxygen consumption is used to enhance the accuracy of oxygen consumption or energy consumption estimation during recovery from the physical activity.

10. Method according to claim 1 , characterized in that information on the level of the index (BFI) is used in the estimation of oxygen consumption or energy consumption level in addition to other method.

11. Method according to claim 5 , characterized in that the predicted downslope component of heart rate or heart rate variability is used as a reference value to determine information on the process of recovering from physical activity.

12. Method according to claim 1 , characterized in that the method is used in a wearable computer.

13. Method according to claim 1 , characterized in that the method is used in a fitness exercise equipment.

14. Method according to claim 1 , characterized in that the method is used in a PC-software.

15. Method according to claim 1 , characterized in that the method is used in ECG/pulse-monitoring equipment.

16. Method according to claim 1 , characterized in that the BFI is indexed as a function of exercise time and exercise intensity.

17. Method according to claim 1 , characterized in that an intermediate measure reflecting accumulative physical activity is used in the calculation instead of the index (BFI), which measure is then transferred to value of the index (BFI).