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Drift in Quaternion and Euler data from stationary cycling

wgeorgewgeorge
in General
Hi
new to this, and wondering if anyone can explain, or more importantly, knows how to prevent drift in Euler and Quaternion data from MetaMotionR sensors in stationary cycling.
I began data collection with the sensors still and flat for around 20 secs. I then taped the sensors to the thigh and lower leg, and collected approx. 30 secs of data from steady state cycling on an ergometer. After a few seconds of cycling in a repeatable motion, the angle data produced begins to drift. it seems to drift more for the lower leg than the thigh.
Does anyone have thoughts on how to explain this and how I might prevent it? 

btw. I have also collected the same data when riding on a bike outside and around corners. the data also seems to drift.

thanks
 

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