The muscle oxygenation debate has been ongoing for years, and now that crank length has been thrown into the mix, it seems were about to open Pandoras box. As we all know, the optimal crank length is often considered a compromise between power output and injury prevention. However, have we been so focused on these factors that weve overlooked the most important consideration - zone 2 efficiency?
Zone 2 is where muscle oxygenation comes into play, and thats exactly what Id like to discuss. Assuming youre riding at a moderate pace, around 50-60% of your maximum power output, does switching to shorter cranks actually improve muscle oxygenation? Proponents of shorter cranks claim that they reduce the stress on your muscles, allowing for more efficient oxygen delivery. But, is this really the case?
Lets consider the facts: when youre pedaling with shorter cranks, youre making more revolutions per minute to maintain the same speed. This could theoretically lead to improved muscle oxygenation, as your muscles arent working as hard to generate power. On the other hand, others argue that this increased cadence actually decreases muscle oxygenation, as your muscles are working at a higher rate to compensate for the reduced leverage.
Then, theres the issue of recirculation. Studies have shown that blood flow and oxygen delivery can be improved by reducing the demand on your muscles. But, does this really translate to shorter cranks being beneficial for muscle oxygenation in zone 2? Or, are we just seeing a placebo effect from reduced perceived exertion?
Its also important to consider the individual variability in muscle oxygenation. We all have different muscle fiber types, and some of us may respond better to shorter cranks than others. But, what about the rest of us? Are we just spinning our wheels (pun intended) if we switch to shorter cranks in pursuit of improved muscle oxygenation?
So, Ill ask the question: do shorter cranks actually improve muscle oxygenation in zone 2, or are we just chasing a pipe dream?