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You are standing at your front door and commuting five kilometers to work. But you don’t have your own car, and there are no bus routes.
You can walk for an hour, or jump on your bicycle and get there in 15 minutes without breaking a sweat. You choose the latter.
Many people will choose the same option. It is estimated that there are more than one billion bikes in the world.
cycling represents one of the most energy-efficient forms of transportation ever invented, allowing humans to travel faster and farther while using less energy than walking or running.
But why exactly does pedaling seem so much easier than going fast on the pavement? The answer lies in the fantastic biomechanics of how our body interacts with this two-wheeled machine.
a wonderful simple machine
At its core, a bicycle is surprisingly simple: two wheels (hence “bi-cycle”), pedals that transfer power to the rear wheel via a chain, and gears that let us optimize our effort. But this simplicity hides a veil Engineering Which completely complements human physiology.
When we walk or run, we essentially move in a controlled manner, catching ourselves with each step. Our legs must swing through large arcs, lifting our heavy limbs against gravity with every step. A lot of energy is spent in this swinging motion itself. Imagine: How tiring would it be to swing your arms continuously for an hour?
On a bicycle, your legs move in very small, circular motions. Instead of moving your entire leg weight with each stride, you’re simply moving your thighs and shins through a compact pedaling cycle. Energy savings are immediately noticeable.
But the real efficiency gains come from how bicycles transfer human power into forward motion. When you walk or run, each step makes a small impact with the ground. You can hear it as the thump of your shoes on the street, and you can feel it as vibrations running through your body. This energy is dissipated, literally dissipated as sound and heat after being sent through your muscles and joints.
Walking and running also add another source of inefficiency: With each step, you give yourself a slight break before actually moving forward. As your foot lands in front of your body, it produces a backward force that slows you momentarily. Your muscles then have to work extra hard to overcome this self-imposed braking and get you moving again.
kiss the road
Bicycles use one of the world’s great inventions – wheels – to solve these problems.
Instead of collision, you get rolling contact – each side of the tire gently “kisses” the road surface before lifting off. No energy is lost in the impact. And because the wheel rotates smoothly the force acts completely perpendicular to the ground, with no stop-start braking action. The force of your pedaling is directly converted into forward motion.
About the author
Anthony Blazevich is Professor of Biomechanics at Edith Cowan University.
This article is republished from The Conversation under a Creative Commons license. read the Original article.
But bicycles also help our muscles work at their best. Human muscles have a basic limit: the faster they contract, the weaker they become and the more energy they expend.
This is the famous force-velocity relationship of muscles. And this is why running feels much harder than jogging or walking – your muscles are working closer to their speed limits, becoming less efficient with every step.
Bicycle gears solve this problem. As you go faster, you can shift to a higher gear so that your muscles don’t have to work as hard as the bike accelerates. Your muscles can remain in their optimal position for both force production and energy expenditure. It’s like a personal assistant that constantly adjusts your workload to keep you in the peak performance zone.
walking sometimes wins
But bicycles aren’t always better.
On very steep hills with a gradient greater than about 15 percent (so you rise 1.5 meters for every 10 metres), your legs struggle to generate enough force through the circular pedaling motion to lift you and the bike up the hill. We can generate more force by pushing our legs straight out, so walking (or climbing) becomes more efficient.
Even if roads are built, we will not be able to climb Mount Everest.
It’s not a case of downhill. While cycling downhill is becoming increasingly easy (eventually requiring no energy at all), riding on steep slopes becomes really difficult.
Once the gradient exceeds about 10 percent (it reduces by one meter for every ten meters of distance traveled), each downhill step creates a jarring effect that wastes energy and puts stress on your joints. Walking and running downhill is not always as easy as we expect.
Not just a transportation device
The numbers speak for themselves. Cycling can be at least four times more energy-efficient than walking and eight times more efficient than running. This efficiency comes from reducing three major energy drains: limb movement, ground impact, and muscle limitations of motion.
So the next time you breeze past pedestrians on your morning bike commute, take a moment to appreciate the biomechanical work of art beneath you. Your bicycle is not just a transportation device, but a fully fledged machine that works in partnership with your physiology, transforming your raw muscle power into efficient motion.