> =A0The average of the 3 creature heart
> rate will be accurate to plus/minus 5 kph I think and moodiness will
> be ruled out.

You could suspend another animal in parallel with these three, NOT on
the wheel itself. That way, through pheromones, you could eliminate
"moodiness" from the strains of running. Think of it as common-mode
noise cancelling.

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