Do shorter cranks really reduce fatigue in long Zone 2 sessions, or are we just seeing a placebo effect due to the reduced perceived exertion that comes with spinning a shorter crank. Some studies have shown that shorter cranks can increase cadence and reduce the torque required to maintain a given power output, but what about the impact on neuromuscular fatigue. Does the reduced muscle activation required to produce the same power output with shorter cranks actually translate to reduced fatigue, or are we just masking the fatigue with a different movement pattern.
Additionally, how does the relationship between crank length and fatigue change when we consider the individual variability in muscle fiber type and pedaling technique. For example, do some riders with a higher proportion of fast-twitch fibers benefit more from shorter cranks, while those with a higher proportion of slow-twitch fibers benefit more from longer cranks. And what about the impact of pedaling technique - do riders with a more efficient pedaling technique benefit less from shorter cranks, while those with a less efficient technique benefit more.
Its also worth considering the impact of shorter cranks on the rest of the body, particularly the lower back and hips. While shorter cranks may reduce fatigue in the legs, do they increase fatigue in other areas, potentially offsetting any benefits. And what about the long-term effects of using shorter cranks - do they lead to changes in muscle strength, flexibility, or coordination that affect performance or increase the risk of injury.