Originally Posted by
gregf83
The argument is that with a one legged powermeter, subconsciously you may end up increasing the asymmetry in order to raise or maintain your power while your actual total power could be stable or going down.
In the absence of any studies on ones subconscious use of one leg over the other while cycling (and not people with medical issues) I'm inclined to think this is just over-analyzing. While I suppose one could really push with the left leg in order to record artificially high numbers there isn't much point in doing this nor do I think anyone would continue to do this for any length of time - at least no one with any sense.