Minimum sample frequency of IMU accelerometer and gyroscope I was wondering how I would justify a sampling rate of 125 Hz for accelerometer and gyroscope data from wearable sensors. This is a rate used in a lot of biomechanics literature, but I can't seem to find a justification.

I have been looking up the Nyquist rate, but I'm not sure how to find the bandwidth of the IMU signal.

Any help in this justification would be great
I'm not sure I can state anything better than Marcus's or Maxtron's comments (it's that way because it's always been that way / because the hardware is limited to that rate), but another way to think about it is:  


The Nyquist rate is 62.5 (=125/2) Hz.  
Can your acceleration or rotational angles (the things measured by the accelerometer and gyroscope) change at a frequency faster than that?


If your instrumented system cannot, then this sampling rate is OK. If your system can move faster, then the sampling will miss something.