Physiological control based upon media content selection

1. A method for playing media content items based on a physiological measurement, the method comprising:

receiving at least one physiological measurement of a user, the physiological measurement associated with a level of exertion of the user during performance of a repetitive-motion activity;

identifying a current physiological measurement for the user;

receiving a current location of a media playback device;

obtaining an anticipated future location of the media playback device;

estimating an estimated physiological impact on the user based on the current location and the anticipated future location; and

transmitting a signal configured to cause the media playback device to modify playback of media content items to at least partially counteract the estimated physiological impact.

2. The method of claim 1 , further comprising:

estimating a future level of exertion of the user based on the current location and the anticipated future location,

wherein the signal is configured to cause the media playback device to adjust a tempo used to select media content items for playback based on the estimated future level of exertion.

3. The method of claim 1 , wherein the physiological measurement includes a heart rate.

4. The method of claim 1 , wherein the physiological measurement includes at least one of respiration, temperature, sweat, and VO 2 .

5. The method of claim 1 , further comprising:

comparing the current physiological measurement to a range,

wherein the signal is configured to cause the media playback device to increase or decrease a tempo of the media content items based on the comparison.

6. The method of claim 5 , wherein the signal is configured to the media playback device to increase the tempo of the media content items when the current physiological measurement falls below the range.

7. The method of claim 1 , further comprising:

transmitting the media content items to the media playback device.

8. The method of claim 1 , further comprising:

receiving a request from the media playback device, the request including information about a cadence value of the repetitive motion activity; and

transmitting media content items having at least one tempo associated with the cadence value.

9. The method of claim 1 , further comprising:

transmitting to the media playback device information about suitability of media content items for playback during the repetitive motion activity.

10. The method of claim 1 , wherein the physiological measurement is obtained using the media playback device.

11. A media delivery system comprising:

at least one processing device configured to control operation of the media delivery system; and

at least one memory device storing software instructions that, when executed by the at least one processing device, cause the media delivery system to:

receive at least one physiological measurement of a user, the physiological measurement associated with a level of exertion of the user during performance of a repetitive-motion activity;

identify a current physiological measurement for the user;

receive a current location of a media playback device;

obtain an anticipated future location of the media playback device;

estimate an estimated physiological impact on the user based on the current location and the anticipated future location; and

transmit a signal configured to cause the media playback device to modify playback of media content items to at least partially counteract the estimated physiological impact.

12. The media delivery system of claim 11 , wherein the software instructions further cause the media delivery system to:

estimate a future level of exertion of the user based on the current location and the anticipated future location,

wherein the signal is configured to cause the media playback device to adjust a tempo used to select media content items for playback based on the estimated future level of exertion.

13. The media delivery system of claim 11 , wherein the physiological measurement includes a heart rate.

14. The media delivery system of claim 11 , wherein the physiological measurement includes at least one of respiration, temperature, sweat, and VO 2 .

15. The media delivery system of claim 11 , wherein the software instructions further cause the media delivery system to:

compare the current physiological measurement to a range,

wherein the signal is configured to cause the media playback device to increase or decrease a tempo of the media content items based on the comparison.

16. The media delivery system of claim 15 , wherein the signal is configured to the media playback device to increase the tempo of the media content items when the current physiological measurement falls below the range.

17. The media delivery system of claim 11 , wherein the software instructions further cause the media delivery system to:

transmit the media content items to the media playback device.

18. The media delivery system of claim 11 , wherein the software instructions further cause the media delivery system to:

receive a request from the media playback device, the request including information about a cadence value of the repetitive motion activity; and

transmit media content items having at least one tempo associated with the cadence value.

19. The media delivery system of claim 11 , wherein the software instructions further cause the media delivery system to:

transmit to the media playback device information about suitability of media content items for playback during the repetitive motion activity.

20. The media delivery system of claim 11 , wherein the physiological measurement is obtained using the media playback device.