What's the Fastest Speed a Person Could Run?

TL;DR

There is likely a human speed limit due to the limited time our feet spend on the ground, preventing us from fully utilizing our muscle strength.

Transcript

This episode of SciShow is sponsored by Blinkist. Blinkist takes all the need-to-know info from thousands of nonfiction books and condenses them into just fifteen minutes of content. To learn more, click the link in the description. {♫Intro♫} In world-class running competitions, athletes just keep getting faster. Like, Usain Bolt — widely known as ... Read More

Key Insights

• 💨 The ability to generate maximum force during the short stance phase is crucial for sprinters to achieve faster speeds.
• 💪 Muscle cells require time to produce maximum force, exceeding the duration of a step during top-speed running.
• 💪 Human leg muscles prioritize strength over maximum speed, as they have evolved for multiple tasks.
• 💪 Genetic advantages, such as extra speedy muscles, may not enable humans to surpass the suggested maximum running speed of 50 km/h.
• 👻 Animals like cheetahs and greyhounds achieve faster speeds by having longer periods with their feet on the ground, allowing them to generate more force.
• 🏃 Humans are limited in their running speed by their evolutionary gait, which differs from the gait of animals like cheetahs.
• 👻 Further advancements in speed may require genetic engineering or the discovery of a different gait that allows for longer foot-to-ground contact.

Questions & Answers

Q: What is the most critical factor in determining a sprinter's speed?

The most critical factor is the ability to push off the ground with maximum force during the short stance phase of a step.

Q: Why can't sprinters use all of their strength during a race?

Muscle cells take longer than the time their feet are on the ground to generate maximum force, leading to an inability to utilize all their strength.

Q: Can technique improvements overcome the speed limit?

While improving technique can help optimize force generation, there will eventually be a limit where muscle fibers cannot provide additional force within the short stance phase.

Q: What is the suggested maximum human running speed according to a 2010 study?

The 2010 study suggests that humans may not be able to exceed speeds of about 50 km/h, even with genetic advantages.

Summary & Key Takeaways

• The fastest sprinters are the ones who can push off the track with the most force during the short time their feet are on the ground.

• Muscle cells take longer than the duration of a step to generate maximum force, limiting an athlete's ability to use all their strength.

• Human leg muscles are optimized for multiple tasks, such as walking and running, and prioritize strength over maximum speed.