Algorithms for detecting athletic fatigue, and associated methods

1. A method for detecting a fatigue of an athlete by monitoring real-time athletic performance of the athlete by a performance tracker operationally coupled to a display, wherein the performance tracker is configured to execute the method comprising:

monitoring a heart rate (HR) of the athlete by a wearable electrocardiogram (ECG) sensor carried by the athlete;

monitoring a magnitude of a muscle response (MR) of the athlete by wearable electromyography (EMG) sensors carried by the athlete, wherein the EMG sensors are positioned adjacent to a plurality of target muscle groups;

transferring the HR and the MR of the athlete from a controller to at least one remote gateway as real-time or near real-time data packets that include both the HR and MR of the athlete, wherein the controller is attached to the athlete;

determining a rate of change of the HR over a first period of time while the athlete is engaged in a given exercise;

determining a rate of change of the MR over a second period of time while the athlete is engaged in the given exercise, wherein the first period and the second period are directly linked and correspond to repetitive instances of the given exercise;

comparing the rate of change of the HR to a first predetermined threshold;

comparing the rate of change of the MR to a second predetermined threshold;

determining whether the athlete is fatigued based on comparing the rate of change of the HR to the first predetermined threshold and comparing the rate of change of the MR to the second predetermined threshold for the given exercise; and

displaying a fatigue warning on the display.

2. The method of claim 1 , wherein the rate of change of the HR is positive over the first period of time, and wherein the rate of change of the HR is greater than the first predetermined threshold, the method further comprising:

determining that the athlete is fatigued.

3. The method of claim 1 , wherein the rate of change of the HR is negative over the first period of time, and wherein the rate of change of the HR is lower than the first predetermined threshold, the method further comprising:

determining that the athlete is fatigued.

4. The method of claim 1 , further comprising:

monitoring an orientation state (OS) of the athlete by a wearable orientation sensor carried by the athlete; and

determining whether the athlete is fatigued at least in part based on an output of the wearable orientation sensor.

5. The method of claim 4 , wherein the wearable orientation sensor is a gyroscope.

6. The method of claim 1 , further comprising:

monitoring an activity state (AS) of the athlete by a wearable activity sensor carried by the athlete; and

determining whether the athlete is fatigued at least in part based on an output of the wearable activity sensor.

7. The method of claim 6 , wherein the wearable activity sensor is an accelerometer.

8. The method of claim 1 , wherein the ECG sensor and the EMG sensors are washable.

9. The method of claim 1 , further comprising:

comparing a ramp rate of the HR to a fall rate of the HR during the first period of time, wherein the first period of time corresponds to the given exercise; and

if the ramp rate of the HR is greater than the fall rate of the HR, determining that the athlete is fatigued.

10. The method of claim 1 , further comprising:

monitoring an orientation state (OS) of the athlete by a wearable orientation sensor carried by the athlete, wherein the orientation state indicates a posture or a relative orientation of the athlete; and

determining whether the athlete is fatigued based on combined outputs of the wearable orientation sensor, the ECG sensor, and the EMG sensors.

11. The method of claim 1 , further comprising:

detecting running averages of the muscle response (MR) of the athlete during the second period of time; and

determining whether the athlete is fatigued based on satisfying conditions of:

a decreasing muscle response magnitude of the athlete within the running averages of the muscle response (MR) of the athlete going below a third predetermined threshold, and

an increasing muscle recovery time of the athlete within the running averages of the muscle response (MR) of the athlete going above a fourth predetermined threshold.

12. A system for detecting a fatigue of an athlete by monitoring real-time athletic performance of the athlete, the system comprising:

a performance monitor, comprising:

athlete's clothing comprising one or more articles of clothing,

a wearable electrocardiogram (ECG) sensor attached with the athlete's clothing, the ECG being configured for monitoring a heart rate (HR) of the athlete,

a plurality of wearable electromyography (EMG) sensors attached with the athlete's clothing adjacent to a plurality of target muscle groups, wherein the EMG sensors are configured for monitoring a magnitude of a muscle response (MR) of the target muscle groups of the athlete; and

a wearable controller attached with the athlete's clothing, the controller being configured to produce real-time or near real-time data based at least in part on input from the ECG sensor and the EMG sensors; and

a performance tracker operationally coupled to a display, the performance tracker configured to:

receive data from the performance monitor,

determine a rate of change of the HR over a first period of time while the athlete is engaged in a given exercise;

determine a rate of change of the MR over a second period of time while the athlete is engaged in the given exercise, wherein the first period and the second period are directly linked and correspond to repetitive instances of the given exercise;

compare the rate of change of the HR to a first predetermined threshold;

compare the rate of change of the MR to a second predetermined threshold;

determine whether the athlete is fatigued based on comparing the rate of change of the HR to the first predetermined threshold and comparing the rate of change of the MR to the second predetermined threshold for the given exercise; and

display a fatigue warning on a-the display.

13. The system of claim 12 , wherein the controller includes a wireless transceiver configured to communicate with the performance tracker.

14. The system of claim 12 , further comprising:

an orientation sensor attached with the athlete's clothing, wherein the orientation sensor is configured to communicate with the controller.

15. The system of claim 14 , wherein the orientation sensor is a gyroscope or a magnetometer.

16. The system of claim 12 , further comprising:

an activity sensor attached with the athlete's clothing wherein the activity sensor is configured to communicate with the controller.

17. The system of claim 16 , wherein the activity sensor is an accelerometer.

18. The system of claim 12 , wherein the ECG sensor is washable.

19. The system of claim 12 , wherein the athlete's clothing comprises a shirt and pants.

20. The system of claim 12 , wherein the athlete's clothing comprises a conductive thread woven in the athlete's clothing.