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From Fellrnr.com, Running tips
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[[File:Cadence Comparison2.jpg|none|thumb|1000px|A comparison of cadence monitoring devices during a [[Long Run]].]]
The graph above is the comparison of a [[Garmin 920XT]] with a [[Footpod]] (red line) with a [[Garmin 225]] using its internal accelerometer (blue line). You can see the internal sensor is far noisier, but worse, it has an overall bias. The Footpod showed an average cadence of 91.1 while the internal sensor was 89.3. That's not a huge difference, but it's far from ideal.
[[File:CadenceV800.jpg|none|thumb|1000px|The [[Polar V800]] cadence compared with a Garmin as a reference.]]
The [[Polar V800]] provides reasonably good tracking of Cadence, though it is biased a little high. For this example run it had an average of 95.5 rather than 94.6. The V800 tracks the walking break at 20 minutes, the faster pace at 30 minutes, and the [[Fartlek]] beginning at 50 minutes.
I plan to perform further tests of the internal accelerometer based devices as time allows.
=Changing Cadence=
