System and method for detecting fatigue and providing coaching in response
A method of operating a fitness tracking system includes receiving at least one first value and at least one second value for at least one foot action parameter from a sensor during a user workout. The method further includes determining whether the user has experienced a first type of fatigue and a second type of fatigue based on the at least one first value and the at least one second value, wherein the first type of fatigue is defined by different rules than the second type of fatigue. When it is determined that the user experienced the first type of fatigue, a first recommended action is provided to the user via a personal electronic device of the user. When it is determined that the user experienced the second type of fatigue, a second recommended action is provided to the user via the personal electronic device.
1. A method of operating a fitness tracking system comprising:
receiving at least one first value for at least one user movement parameter from a sensor carried by a user during a first period of time during a workout;
receiving at least one second value for the at least one user movement parameter from the sensor during the first period of time during the workout;
determining a fatigue level of the user based at least in part on the received at least one first value and at least one second value;
determining a rate of change for the at least one user movement parameter based on the first and second values received during the first period of time;
determining whether the rate of change exceeds a threshold rate of change during the first period of time;
identifying a fatigue moment associated with the first period of time when the rate of change exceeds the threshold rate of change;
determining a first recommended action for the user in response to the fatigue moment;
providing an indication of the fatigue moment and the first recommended action to the user in real time via a user interface during the workout;
after identification of the fatigue moment during the first period of time, determining a fatigue level during a second period of time and whether another fatigue moment occurred during the second period of time;
when another fatigue moment did not occur during the second period of time, determining whether the determined fatigue level exceeded a coaching threshold during the second period of time;
determining a second recommended action for the user based on the fatigue level; and
providing an indication of the fatigue level and the second recommended action to the user via the user interface during the workout.
2. The method of claim 1 wherein identifying a fatigue moment includes determining a workout time or a geographic location where the fatigue moment occurred.
3. The method of claim 2 wherein providing an indication of the fatigue moment includes providing an indication of the geographic location of the fatigue moment on a map associated with the user workout.
4. The method of claim 1 further including determining a workout time or a geographic location where the fatigue moment occurred and providing the indication of the geographic location of the fatigue moment on the user interface after the workout.
5. The method of claim 1 wherein providing the indication of the fatigue moment occurs during the user workout.
6. The method of claim 5 wherein the user interface is a graphical user interface, a haptic feedback device, or an acoustic device.
7. The method of claim 1 wherein the at least one user movement parameter includes one or more of foot ground contact time, foot strike angle, cadence, stride length and speed.
8. The method of claim 1 wherein the sensor is embedded in a sole of an article of footwear worn by the user.
9. The method of claim 1 wherein the at least one user movement parameter includes a plurality of parameters such that at least one first value includes a first set of values and the at least one second value includes a second set of values, and wherein determining the fatigue level includes performing a dimensionality reduction method on the first set of values and the second set of values in order to create at least one additional parameter indicative of fatigue status.
10. The method of claim 9 wherein the dimensionality reduction method is principal component analysis.
11. The method of claim 9 further comprising determining another recommended action for the user based on both (i) a first fatigue level and a first workout time associated therewith and (ii) a second fatigue level and a second workout time associated therewith.
12. The method of claim 1 wherein the first recommended action is based exclusively on a plurality of fatigue moments that occurred during the workout.
13. The method of claim 1 wherein the first recommended action is based on a plurality of fatigue moments including the fatigue moment that occurred during the workout and additional fatigue moments that occurred during additional workouts.