Optimal efficiency is approximately what walking speed?

Optimal efficiency is approximately what walking speed?

• A. 3.0 m/sec
• B. 1.33 m/sec
• C. 0.5 m/sec
• D. 2.5 m/sec

Answer: (B)

Optimal efficiency in walking means using the least energy to cover a given distance. For most adults, that minimum energy per unit distance occurs at about 1.3 m/s (roughly 4.5–5 km/h). At this pace the body’s movement best leverages the energy exchange between potential and kinetic energy during each step, keeping the muscular work needed relatively low. If you walk slower, you spend more time in the stance phase and the energy recycling becomes less efficient, so more energy is used per meter. If you walk faster, the muscles must produce more force to propel and accelerate the body, increasing energy waste per meter as well. So the speed around 1.33 m/s hits that sweet spot of lowest energy expenditure per distance, making it the most efficient choice. The other speeds are either too slow or too fast to minimize energy per unit distance.

Optimal efficiency in walking means using the least energy to cover a given distance. For most adults, that minimum energy per unit distance occurs at about 1.3 m/s (roughly 4.5–5 km/h). At this pace the body’s movement best leverages the energy exchange between potential and kinetic energy during each step, keeping the muscular work needed relatively low. If you walk slower, you spend more time in the stance phase and the energy recycling becomes less efficient, so more energy is used per meter. If you walk faster, the muscles must produce more force to propel and accelerate the body, increasing energy waste per meter as well. So the speed around 1.33 m/s hits that sweet spot of lowest energy expenditure per distance, making it the most efficient choice. The other speeds are either too slow or too fast to minimize energy per unit distance.