Muscle mass and absolute strength advantages in sprinting
The men-to-women gap in running varies dramatically by event distance. In the 100m sprint, men's records are roughly 8-11% faster, reflecting greater muscle cross-section and power production. Men's testosterone levels naturally average 15-20 times higher than women's, creating muscle mass and force generation advantages that persist despite identical training and nutrition interventions.
The gap widens in events requiring explosive force (shot put, long jump) where the gap reaches 20-30% because maximum strength output is the limiting factor. In endurance events (marathon), the gap narrows to 8-10% because cardiovascular capacity, trainability, and biomechanical efficiency become more important than absolute muscle advantage.
Hormonal differences and aerobic capacity
The gap in absolute strength reflects biological reality: men develop larger muscles under baseline testosterone. VO2 max (milliliters of oxygen per kilogram per minute) also differs by roughly 15-20%, but this gap is smaller than strength gaps and can be partially bridged through superior aerobic training if women train at identical relative intensities.
Interestingly, women's training responsiveness to high-intensity intervals equals or exceeds men's, suggesting the limiting factor is peak aerobic capacity (VO2 max) and power output, not trainability. This explains why women excel in endurance sports relative to strength sports: lower absolute force requirements mean smaller disadvantages compound less.