There is no evidence that "balanced" production increases power output over slightly unbalanced production --though if you amputate one of the legs, maybe, since that's hardly "slightly unbalanced".
There is no evidence.
OK. How many studies have been performed on slightly unbalanced riders ?
How unbalanced must it be to be considered "more than slightly unbalanced" ?
Could it be that there is very little data because there are so few power meters that measure the difference ? hmmmm......
I really find it amusing that people are arguing that they don't need to know how efficient half your body's power transfer apparatus is working.
1. Force sensing pedals have been around for a while. For examples, see many of the studies where S. Kautz is one of the co-authors.
2. The amputee study I linked above shows that even with huge bilateral asymmetry, his power was almost certainly affected by less than 25%; that is, he was measured post-amputation at 4.5 W/kg for a TT. Unless his pre-amputation W/kg was *greater than* 6 W/kg, it means he could produce *at minimum* 75% of his prior power with only one leg. And, we could well expect his pre-amputation W/kg to be probably less than 6 W/kg since his VO2Max was 63 ml/kg/min. In other contexts, such as the Kautz data above, we know that "evenness" of the application of force around the crank cycle is *not* related to power output. And, from other studies, we know that aerobic power output is the main determinant of TT performance. All of this together is just more evidence that small imbalances ("small" meaning something that you wouldn't have noticed if you hadn't measured it) are not the limiter in performance. The muscles in one leg are not quite but almost up to the task of producing as much power from aerobic metabolism as two legs, so unless your imbalance were something like 75/25 or greater (and you would have noticed something of that magnitude), you'll be able to compensate for it. If not, amputees would have a lower respiration rate than people with two legs.